WO2017200134A1 - Apparatus for forming nitrogen cloud in order to manufacture hot-dip metal coated steel sheet having excellent surface quality, and method for manufacturing coated steel sheet by using same - Google Patents

Apparatus for forming nitrogen cloud in order to manufacture hot-dip metal coated steel sheet having excellent surface quality, and method for manufacturing coated steel sheet by using same Download PDF

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Publication number
WO2017200134A1
WO2017200134A1 PCT/KR2016/005617 KR2016005617W WO2017200134A1 WO 2017200134 A1 WO2017200134 A1 WO 2017200134A1 KR 2016005617 W KR2016005617 W KR 2016005617W WO 2017200134 A1 WO2017200134 A1 WO 2017200134A1
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Prior art keywords
steel sheet
strip
plating bath
weight
plating
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PCT/KR2016/005617
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French (fr)
Korean (ko)
Inventor
임병문
문병선
송용근
최익석
Original Assignee
동국제강주식회사
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Application filed by 동국제강주식회사 filed Critical 동국제강주식회사
Priority to ES201890066A priority Critical patent/ES2725126B1/en
Priority to DE112016006868.9T priority patent/DE112016006868B4/en
Priority to NZ721156A priority patent/NZ721156A/en
Priority to GB1817297.3A priority patent/GB2564365B/en
Publication of WO2017200134A1 publication Critical patent/WO2017200134A1/en

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/12—Aluminium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/325—Processes or devices for cleaning the bath
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips

Definitions

  • the present invention relates to an apparatus for forming a nitrogen cloud (sheet) for producing a hot-dip galvanized steel sheet and a method for manufacturing a plated steel sheet using the same, and more specifically to a metal such as zinc or aluminum
  • the present invention relates to a device for efficiently forming a non-oxidizing atmosphere in order to block a plated steel sheet from outside air in an apparatus for hot-dip plating, and a method of manufacturing a plated steel sheet using the same.
  • Hot-Dip Metal Coated Steel Sheet is widely used as part of securing corrosion resistance of steel sheet.
  • the typical galvanized steel sheet (GI) is widely used on the basis of economical efficiency and abundant resources, and is one of the most used galvanized steel sheets.
  • GI galvanized steel sheet
  • Al-Zn aka Galvalume
  • the aluminum plated steel sheet has excellent corrosion resistance and heat resistance compared to galvanized steel sheet, and is widely applied to automobile mufflers, home appliances, and heat resistant materials.
  • an aluminum steel sheet containing Ti in iron of Japanese Patent Laid-Open No. 57-47861 an aluminum plated steel sheet containing C, Si, Cu, Ni and a small amount of Cr in iron of Japanese Patent Laid-Open No. 63-184043, of Japanese Patent Laid-Open No. 60-243258
  • Si of 10% or less is added to the aluminum plating bath. Since the plated steel sheet produced by this method is relatively excellent in workability and heat resistance, it is widely used in heat-resistant parts such as mufflers, water heaters, heaters, rice cookers, and the like of automobiles.
  • the silicon added to suppress the formation of the alloy layer in some cases, rather than damage the surface appearance of the plated steel sheet has a problem that has a clear appearance
  • the damage of the surface appearance by the addition of silicon is a small amount of magnesium It is known to solve to some extent by addition.
  • Zn-Al alloy plated steel sheet As described above, there is a disadvantage that the cut processing does not exhibit sufficient corrosion resistance. This phenomenon is due to the deterioration of the corrosion resistance due to the reduction of the sacrificial anti-corrosive zinc that the surface exposed to the cut end portion prevents corrosion of iron due to the zinc-aluminum alloy layer.
  • Zn-Al alloy plated steel sheet has a disadvantage in that the plating layer is formed in a form that does not have a heterogeneous alloy phase, so that the interface is weak at the time of use after bending processing or drawing processing, thereby deteriorating corrosion resistance after processing.
  • Hot-dip galvanized steel sheet depends not only on the composition of the plating bath, but also on the technique of controlling the surface of the steel sheet coming out of the plating bath.
  • the components of the hot dip layer for example, Zn, Al, Mg, etc., combine with oxygen in the air to form an oxide film, which is a factor of lowering the surface quality of the plated steel sheet.
  • a plated steel sheet product in which Mg is added to the plating bath is more problematic in appearance quality of the surface than in the case of general GI and GL plating baths, which is a problem caused by oxidative properties of Mg elements.
  • Mg is a highly oxidizing element, and the oxidation reactivity is particularly high in a high temperature plating bath, which causes oxides or Mg fine oxides bound to other elements to be squeezed onto the strip, causing problems of deterioration of the surface of the plated steel sheet.
  • the strip deposited on the molten metal from the plating bath (pot) is exposed to the air, and a method of plating a non-oxidizing atmosphere to prevent oxidation in a section where cooling is performed and a device therefor are well known.
  • a method of plating a non-oxidizing atmosphere to prevent oxidation in a section where cooling is performed and a device therefor are well known.
  • the conventional method or apparatus has various problems.
  • each plating bath is 460 °C (general zinc-aluminum plated bath) and 600 °C (galvalume steel plate bath) 650 °C (aluminum plated bath) due to the sealed box shape. As a result, the hot heat inside is not properly released into the atmosphere and the temperature inside the box / vessel is raised.
  • a cooling device In order to prevent this problem, a cooling device must be separately configured to prevent the temperature rise of various electric devices. It also reduces the lifetime of various electrical devices.
  • the purpose of forming a non-oxidizing atmosphere by injecting nitrogen gas is to prevent oxidation on the surface of plating molten metal and to prevent the generated oxide from adsorbing to Strip.
  • surface oxide generated on the surface of molten metal (Top Dross) is not easy to remove
  • Air Knife is a method of filling by using injected nitrogen for plating deposition control and supplying from other supply line from outside.
  • the amount of nitrogen injected from the continuous zinc plating line Air Knife is usually 3000 ⁇ 6000m3 / hr, which is not enough to fill the box type oxygen with nitrogen, and as mentioned earlier, Nitrogen gas should be additionally supplied from outside. To this end, 3000 ⁇ 4000m3 / hr of nitrogen should be supplied in addition to the nitrogen supplied from Air Knife. Works.
  • the present invention has been made in view of the above point, and an object of the present invention is to provide an apparatus for forming a non-oxidizing atmosphere in the steel sheet coming from the surface of the plating bath in the production of hot-dip steel sheet.
  • Another object of the present invention is to provide a method for producing a plated steel sheet excellent in surface appearance and corrosion resistance.
  • the present invention is installed between the plating bath surface for hot-dip plating and the air knife facility for controlling the thickness of the plating metal attached to the surface of the strip circumference of the strip rising from the plating bath It is achieved by providing an apparatus for forming a nitrogen cloud (membrane) in the.
  • the apparatus of the present invention the slit through which the strip passes through a spaced apart from the surface of the plating bath, having a semi-cylindrical body, the bottom of which is open toward the plating bath surface, the upper surface of the body And a lower gas discharge part is formed around the lower end of the body to inject nitrogen gas toward the plating bath surface to block external air, and crosses the bottom of the body in the width direction of the strip. It is disposed on both sides of the inner gas discharge unit for injecting nitrogen gas toward the strip, the inside of the body is characterized in that a plurality of injection nozzles for injecting nitrogen gas toward the strip is formed.
  • the present invention provides a method of manufacturing a zinc-aluminum alloy plated steel sheet using the apparatus.
  • the zinc-aluminum alloy plated steel sheet is 35 to 55% by weight of zinc, 0.5 to 3% by weight of silicon, 0.005 to 1.0% by weight of chromium, 0.01 to 3.0% by weight of magnesium, and 0.001 to 0.1% by weight of titanium. It is characterized by producing a zinc-aluminum alloy plated steel sheet excellent in workability and corrosion resistance by plating in the plating bath containing aluminum and inevitable impurities. According to this, the produced plated steel sheet has excellent surface appearance and corrosion resistance.
  • the plating bath may further include 1 to 10% by weight of calcium based on the total weight of magnesium.
  • the apparatus of the present invention there is an effect of forming a nitrogen cloud (veil) around the steel sheet exiting the plating bath to prevent contact with external air before the steel sheet (strip) reaches the air knife facility.
  • the apparatus of the present invention is to inject the nitrogen gas into the inside of the body to fill the inside of the body with nitrogen gas as a whole, the bottom opening of the body through the lower gas discharge portion formed in the bottom of the body to block the nitrogen gas from the outside air And injecting nitrogen gas toward the strip through the inner gas discharge portion at both sides of the strip rising from the surface of the plating bath, to block the plating metal attached to the strip from the outside air from the moment of exiting the surface of the plating bath. Doing.
  • the apparatus of the present invention may further form an upper gas discharge portion for injecting nitrogen gas in the direction of the strip passing through the slit on both sides of the slit.
  • the outside air containing oxygen is prevented from entering the inside of the body through the slit.
  • the inner gas discharge part may include a circular pipe body in which a plurality of nozzles for discharging nitrogen gas are formed at regular intervals in a longitudinal direction, and a housing in which a concave groove is formed in the longitudinal direction to accommodate one side surface of the pipe body, and the pipe body. Corresponding grooves are formed to include a fixed block to allow the pipe body to be seated at both ends of the pipe body, the pipe body and the housing may be formed with one or more passages through which nitrogen gas moves.
  • the present invention has the effect of improving the quality of the hot-dip galvanized steel sheet by preventing the contact with the outside air before the steel sheet exiting the plating bath passes through the air knife.
  • Figure 3 is a perspective view of the body portion according to an embodiment of the present invention.
  • Figure 4 is an enlarged partial view of the body portion in another embodiment of the present invention.
  • FIG. 5 is a perspective view of a body portion according to another embodiment of the present invention.
  • Figure 6 is a perspective view of the inner gas discharge unit in another embodiment of the present invention.
  • Figure 7 is an exploded perspective view of the inner gas discharge unit according to another embodiment of the present invention.
  • FIG. 8 is a cross-sectional view taken along line AA ′ of FIG. 6.
  • Figure 9 is a bottom view of the body portion according to another embodiment of the present invention.
  • the device of the present invention is spaced a certain distance from the plating bath surface 10, it is located below the air knife facility (2) .
  • the device of the invention has a body 3.
  • the body portion 3 is a semi-cylindrical dome shape, the upper surface is formed with a slit 32 through which the plated strip 100 passes in the longitudinal direction of the body portion (3).
  • the slit 32 is formed larger than the thickness and width of the strip (100).
  • Body portion 3 may be made of iron plate.
  • the bottom of this body part 3 is open toward the surface 10 of the plating bath.
  • a bottom gas discharge portion 33 for injecting nitrogen gas toward the surface 10 of the plating bath is formed at the bottom edge of the body 3.
  • the lower gas discharge part 33 is similar to a device called an air curtain, and sprays compressed nitrogen gas downward through a slit 33a (see FIG. 9) to form an air film (air curtain) to form the lower gas discharge part.
  • the inside and outside of (33) are isolated from outside air.
  • the apparatus of the present invention comprises a plurality of nozzles 34 for injecting nitrogen gas into the body 3.
  • the nozzles 34 form nitrogen clouds S in the body 3 by injecting nitrogen gas toward the center of the body 3.
  • the apparatus of the present invention crosses the bottom surface of the body 3 in the width direction of the strip 100, the inner side is disposed opposite to both sides of the strip 100 to inject nitrogen gas toward the strip 100 It includes a gas discharge portion 31.
  • Nitrogen gas is injected from the moment when the strip 100 emerges from the surface 10 of the plating bath, thereby preventing oxygen from affecting the surface of the strip 100. It also has the effect of discharging the heat emitted from the strip 100 to the outside of the device. That is, since the apparatus of the present invention is spaced apart from the plating bath surface 10, and the lower surface is open, the strips are formed by the nitrogen gas injected from the nozzle 34 and the inner gas discharge part 31. 100) and the heat emitted from the molten metal 1 can be easily discharged to the outside.
  • forming a non-oxidizing atmosphere by injecting nitrogen into the steel sheet exiting the plating bath is a known technique (D1 to D6) as described above.
  • a closed space such as a box
  • the heat of the molten metal is not discharged to the outside, so that the internal machinery and various Damage and malfunction of the sensor will occur.
  • the apparatus since a closed space must be opened for the periodic removal of oxides generated on the surface of the plating bath, the apparatus has a disadvantage in that the operation of the apparatus is stopped or the quality is deteriorated by the inflow of external air.
  • the apparatus of the present invention is installed at the bottom of the air knife facility 2 that controls the amount of plated metal attached to the strip 100.
  • the inner gas discharge unit 31 is directly covered with a steel plate in a state surrounded by a dome-shaped body 3 and blocked outside air by nitrogen injected from the lower gas discharge unit 33 formed at the lower edge of the body 3. Injecting nitrogen in the direction (100) and the remaining space is filled with nitrogen discharged from the injection nozzle 34 to form a space (S) in which a non-oxidizing atmosphere formed by nitrogen is formed as shown in FIG. will be.
  • the apparatus of the present invention is spaced apart from the surface 10 of the plating bath by a certain distance, it is easy to insert the equipment to remove the molten surface oxide by manpower or the apparatus, and nitrogen is continuously sprayed during the removal operation. This has the advantage of not stopping.
  • the molten metal surface oxide formed on the surface of the molten metal could not be prevented from adhering to the steel sheet or forming a fine oxide film by magnesium.
  • Nitrogen is injected from the inclined downward direction in the direction of the steel sheet 100 to force the surface oxide of the molten metal pushed out of the steel sheet 100, the molten surface oxide is buried in the steel sheet 100 or fine oxidation It is possible to suppress the occurrence of the film more efficiently.
  • reference numeral 50 denotes a meniscus formed by molten metal attached to both surfaces of the steel sheet 100 and drawn up from the surface of the plating bath, and the amount of molten metal contained in the meniscus is the steel sheet 100. It becomes the thickness of the plated metal attached to the, it is controlled by the moving speed of the steel sheet, the pressure of nitrogen gas injected from the air knife (2).
  • the inner gas discharge part 31 serves to physically remove the Dross generated from the meniscus outermost surface so as not to adhere to the plated steel sheet or suppress the oxidizing atmosphere in which the Dross occurs.
  • FIGS. 4 to 5 show an apparatus according to another embodiment of the present invention.
  • a pair of upper gas discharge parts 35 for injecting nitrogen gas in the direction of the slit 32 from both sides of the slit 32 formed on the upper surface of the body 3 of the apparatus of the present invention are additionally formed.
  • the nitrogen gas injected at such a strong pressure is mixed with the outside air to vortex It can also form.
  • Such vortices may enter the inside of the body 3 through the slit 32, and in order to prevent this, an upper gas discharge part 35 is formed above the slit 32 to inject nitrogen gas therefrom. It is to prevent the oxygen mixed in the vortex from entering the body 3 through the slit 32.
  • the inner gas discharge part 31 may have a circular pipe main body 31a and one side surface of the pipe main body 31a in which a plurality of nozzles 311 for discharging nitrogen gas are formed at regular intervals in the longitudinal direction.
  • a housing 31b having a concave groove 314 formed in the longitudinal direction and a recess 330 corresponding to the pipe main body 31a are formed to accommodate the pipe main body 31a at both ends of the pipe main body 31a. It includes a fixed block (31c) to be.
  • one or more nitrogen supply holes 315 and 312 are provided in the pipe main body 31a and the housing 31b to provide a passage for supplying nitrogen gas.
  • the housing 31b, the pipe body 31a and the fixing block 31c are fixed by fixing bolts 318 passing through the screw holes 316 and 317.
  • caps 313 having an outer diameter larger than the outer diameter of the pipe main body 31a are formed at both ends of the pipe main body 31a.
  • the operator can loosen the fixing bolt 318, grab the cap 313 to rotate the pipe body 31a by a predetermined angle.
  • a plurality of nozzles 311 are formed on the pipe main body 31a, but nitrogen gas may be discharged through the slits long cut like the air curtain.
  • FIG. 9 exemplarily illustrates a state in which the inner gas discharge part 31 having a slit shape is formed in the body 3.
  • FIG. 9 is a view seen from the bottom of the body 3, in which an inner gas discharge part 31 having a slit 33f for ejecting nitrogen gas is fixed to the body 3 by a support bridge 39.
  • the device of the present invention forms a nitrogen barrier in only a portion of the bottom of the air knife, there is no spangle minimizing interference element due to the deformation of the structure due to the latent heat generated in the conventional Box Type and the decrease in cooling capacity after plating.
  • the device of the present invention is not a box type like a conventional device that covers the entire air knife that controls the coating amount from the surface of the molten metal, but the lower section of the air knife where oxidation occurs or the dross can be adsorbed onto the strip. It forms a nitrogen curtain (nitrogen film) using a nozzle to form nitrogen DAM. It is not a method of filling nitrogen into the enclosed space, but by injecting nitrogen into the upper and lower portions of the lower section of the air knife to form a nitrogen barrier (S) and maintaining the inside in a nitrogen atmosphere, so that the gas flows smoothly from the inside to the outside of the device. Do not keep.
  • the nitrogenous membrane (S) of the present invention is formed only in a part of the bottom of the air knife as can be seen in the drawing, it does not affect any structure (parts) other than the surface of the molten metal plating and the plating is in progress. Therefore, there is a low possibility of error caused by heat of electric devices for driving air knife such as structure deformation and various sensors and motors due to heat generated in the conventional Box Type.
  • the device of the present invention is not directly contacted or deposited with the surface of the molten metal, but is spaced a certain distance from the surface of the molten metal, so that there is no obstacle when removing Dross by using a manpower or a robot through this space.
  • it is effective to maintain nitrogen atmosphere because it always maintains the curtain of nitrogen curtain type sprayed through the nozzle even when the device or tool is inserted in the space to remove Top Dross.
  • the present invention includes the effect of physically preventing the adsorption of the Top Dross and the fine oxide film on the Strip while forming a nitrogen atmosphere to suppress the Top Oxide and the fine oxide film on the upper surface of the molten metal.
  • the present invention forms a nitrogen barrier in the lateral direction of the plating bath when nitrogen is injected downward from the lower nitrogen gas discharge unit 33 (see FIG. 1). It physically prevents the movement to the vicinity of the strip, so that it does not adsorb on the strip.
  • the present invention having the effect of preventing adsorption on the strip after plating at the same time as forming the nitrogen atmosphere is different from the conventional apparatus for suppressing the oxide by forming only the existing nitrogen atmosphere.
  • the device of the present invention forms a nitrogen atmosphere only for a part of the space required at the bottom of the air knife, even with a small amount of nitrogen emitted from the lower nitrogen gas discharge unit 33, the nitrogen membrane can be maintained and maintained at a pressure higher than normal pressure. It is more efficient than the conventional box type that supplies nitrogen.
  • the present invention can also reduce the nitrogen usage.
  • the present invention is a production method that can exhibit a more effective oxide production inhibitory, adsorption prevention effect than the conventional method.
  • the present invention using the above device, zinc-aluminum alloy plated steel sheet 35 to 55% by weight of zinc, 0.5 to 3% by weight of silicon, 0.005 to 1.0% by weight of chromium, 0.01 to 3.0% by weight of magnesium, 0.001 to Provided is a method for producing a zinc-aluminum alloy plated steel sheet excellent in workability and corrosion resistance by plating in the plating bath containing 0.1% by weight, the remainder of which is aluminum and inevitably contained impurities.
  • the present invention is a zinc-aluminum-based alloy plated steel plate to be plated in the plating bath having the plating composition as described above in a portion spaced apart from the surface of the plating bath, and at the bottom of the air knife installation, by forming a nitrogen dam on the surface of the plating bath The fine oxide film produced in contact with oxygen is prevented from adsorbing to the steel sheet.
  • the plating bath comprises 35 to 55% by weight of zinc.
  • Zinc has a sacrificial anticorrosive property than base iron to prevent corrosion. It is necessary to secure more than 35% by weight. If it is less than this, the plating bath fluidity and corrosion resistance are lowered, and if it is abnormal, the temperature of the plating bath must be increased, resulting in an operational problem with an increase in the top dross. This becomes bad.
  • the cost is increased due to the increase in the aluminum ratio of the plated steel sheet, thereby lowering the economic efficiency.
  • the plating bath of the present invention contains 0.5 to 3.0% by weight of silicon.
  • Silicon has the effect of imparting gloss by improving the fluidity of the plating bath with the purpose of suppressing the growth of the alloy layer, and the amount of addition should be added at least 0.5% by weight. This is an important role of silicon in the plating layer to control the alloy layer formation of the base steel sheet and aluminum, if the addition amount is 0.5% by weight or less, the function is limited and the workability is significantly reduced.
  • the addition of more than 3% by weight of the Mg2Si phase acts as a contributing factor to the improvement of the corrosion resistance of the coating layer, resulting in excessive surface roughness and surface discoloration, premature surface discoloration and post-treatment coating properties appear to be inhibited do. Therefore, it is preferable to make the addition amount of silicone into 0.5 to 3 weight%.
  • Chromium added to the plating bath forms a dense passivated oxide film on the surface of the plating layer to improve the corrosion resistance of the aluminum plated steel sheet and to form a uniform distribution of chromium elements in the plating bath, thereby miniaturizing the grains of the plating layer. .
  • a band of Al-Zn-Si-Cr mixture of a certain type integrated in the plating layer (Fig. 2) and the chromium component in the plating layer reacts with aluminum to form an AlCr2 phase. It acts to improve corrosion resistance.
  • the role of chromium is controlled to 3% by weight or less of the silicon content to act as a factor that controls the excessive precipitation in the form of acicular shape of the silicon component in the plating layer.
  • the content of chromium having such an effect should be added at least 0.1.
  • the content of chromium is 0.005 to 1.0% by weight. If the content of chromium is less than 0.005% by weight, there is little effect of uniform distribution in the plating bath. If the content of chromium is more than 1.0% by weight, the temperature of the plating bath is required to increase as the content of chromium increases. (dross) is increased, there is a problem that the dross is attached to the plated steel sheet surface damage appearance. Therefore, it is preferable that the addition amount of chromium is 0.005 to 1.0 weight%.
  • the plating bath of the present invention also contains 0.01 to 3.0% by weight of magnesium.
  • Magnesium added with the chromium combines with oxygen in the air in contact with the plating layer to form a passivation film to prevent the diffusion of oxygen into the alloy layer and to prevent further corrosion to improve corrosion resistance.
  • the presence of the Mg 2 Si phase (see FIGS. 1 and 2) formed by the reaction of magnesium and silicon in the plating layer and the MgZn 2 phase formed by the reaction of magnesium and zinc are corroded by formation of a local battery along with the sacrificial corrosion resistance of zinc in the course of corrosion. It is to reduce the speed.
  • the amount of magnesium added is less than 0.01% by weight, the effect of improving corrosion resistance due to dispersion and oxidation characteristics is small. If the amount of magnesium exceeds 3.0% by weight, the plating bath is saturated and the melting point is increased. As a result of deterioration of surface quality, the production process increases with the increase of manufacturing cost.
  • the addition amount of magnesium is 0.01 to 3.0 weight%.
  • the plating bath of the present invention also contains calcium 1 to 10% by weight of magnesium.
  • the calcium added together with the magnesium and chromium prevents the phenomenon of inhibiting the production of magnesium oxide generated at the surface of the molten metal by causing the magnesium microoxide film to adhere to the surface of the plated steel sheet to inhibit the appearance quality.
  • the mechanism of the method of suppressing the oxidizing power of the molten metal by adding calcium is that the ignition temperature of the Mg molten metal increases by 200 ° C or more due to the addition of calcium.
  • An increase in the ignition temperature of the Mg alloy due to the addition of calcium generally forms an oxide layer formed on the surface. It is possible to effectively block the inflow of oxygen by changing from the porous oxide layer to the dense oxide layer.
  • the amount of calcium added is less than 1% by weight of magnesium, the dispersibility is low, and the inhibitory effect of the MgO oxide film is less, and when the amount of calcium exceeds 10% by weight of magnesium, the plating layer is formed by the intermetallic compound generation of aluminum and calcium. It may cause deterioration of processability. Therefore, the amount of calcium added is preferably 1 to 10% by weight of the magnesium weight ratio.
  • 0.001 to 0.1 weight% of titanium is included in order to refine
  • the present invention is based on miniaturizing a spangle by adding chromium, magnesium, calcium, and titanium to a plating bath containing aluminum, zinc, and silicon, which are conventional galvalume-plated steel, in an appropriate composition at the same time, thereby creating many opportunities for nucleation. do.
  • the added components are dispersed in the plating layer after the steel plate is plated in the molten metal to form a myriad of nuclei such as Mg 2 Si phase, MgZn 2 phase, AlCr 2 phase, and the like to interfere with each other between grain boundaries during the solidification of the plating material.
  • nuclei such as Mg 2 Si phase, MgZn 2 phase, AlCr 2 phase, and the like to interfere with each other between grain boundaries during the solidification of the plating material.
  • the temperature of the steel plate at the time of bathing in a molten plating bath to 570-650 degreeC, and the molten metal temperature to 550-650 degreeC.
  • the bath temperature of the steel sheet is 550 °C or less, the fluidity of the plating bath is reduced, and the appearance of the plating film is poor, and coating adhesion is degraded.
  • the temperature is over 650 °C, thermal diffusion of the steel sheet is accelerated, resulting in abnormal growth of the alloy layer. This is because the workability is deteriorated and at the same time, a problem of excessive generation of the Fe oxide layer in the molten metal occurs.
  • the plating deposition amount is set on the basis of one side of 20 ⁇ 100g / m2. If the plating deposition amount is below 20g / m2, the air pressure of the air knife equipment that controls the deposition amount is excessively increased, which causes variation in plating deposition amount. Along with this, the rapid increase in surface oxides in the melt results in damage to the appearance of the coating and deposition of oxide dross.
  • a stripped cold rolled steel sheet having a thickness of 0.8 mm, a width of 120 mm, and a length of 250 mm was plated using the apparatus according to claim 3 of the present invention.
  • Table 1 shows the evaluation results based on the single-side plating adhesion amount of the manufactured zinc-aluminum alloy plated steel sheet.
  • Corrosion resistance and processability were evaluated. Corrosion resistance was compared with 5% according to KSD 9504 test method and evaluated at initial red blue development time (5%) in 35 °C NaCl salt spray test atmosphere. According to the 180 ⁇ OT bending test, the width of the crack (the width of the fracture surface) generated after observing with a stereo microscope of 30 to 50 magnification was measured to measure the width of the fracture surface. Comparative evaluation. Observation of the alloy phase using an X-ray diffraction (XRD) equipment.
  • XRD X-ray diffraction
  • Degree of dross generation The result of measuring the amount of dross generated on the upper part of the plating bath after the preparation of the molten plating specimen by the plating composition.
  • Shear surface corrosion resistance The degree of red blue color development after 1,000 hours of salt spray test was evaluated.
  • Corrosion resistance of plate The degree of red blue color development after 2,500 hours of salt spray test was evaluated.
  • the amount of dross generated in the case of plating using the apparatus according to the present invention is small, and also the workability and corrosion resistance of the steel sheet plated according to the invention example are excellent. That is, in the case of the invention example, even after the 180 ° OT bending test was performed (cracked surface) was determined to be 10 ⁇ 20 ⁇ m superior to the case of the comparative example, also in the corrosion resistance even in the case of the invention example, in the flat end red blue plating amount At 50g / m 2 on one side, more than 3,000 hours and the red-blue shear part is more than 1000 hours, which is much better than the existing composition. As a result of visual observation, it was shown that the surface appearance of the production example to which the apparatus of the present invention was applied was better than that of the comparative example. This is a result of the miniaturization of the sequin size.

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Abstract

Provided is an apparatus, which is provided between the surface of a plating bath for hot-dip plating and air knife equipment for controlling the thickness of plating metal attached to the surface of a strip, so as to form a nitrogen cloud (curtain) along the periphery of the strip rising from the plating bath. The apparatus of the present invention: has a semicylinder-shaped body spaced at a predetermined distance from the surface of the plating bath and of which the bottom surface is opened so as to face the surface of the plating bath; has a slit, through which the strip passes, formed on the upper surface of the body; has a lower gas exhaust part formed along the periphery of the lower end portion of the body, and spraying nitrogen gas toward the surface of the plating bath so as to block external air; includes inner gas exhaust parts arranged at both sides of the strip so as to face each other, while traversing the bottom surface of the body in the width direction of the strip, so as to spray the nitrogen gas toward the strip; and has a plurality of spray nozzles, formed at the inner side of the body, for spraying the nitrogen gas toward the strip.

Description

표면 품질이 우수한 용융도금강판을 제조하기 위한 질소구름을 형성하기 위한 장치 및 이를 이용한 도금강판을 제조하는 방법Apparatus for forming nitrogen cloud for producing hot-dip galvanized steel sheet with excellent surface quality and method for manufacturing plated steel sheet using the same
본 발명은 표면 품질이 우수한 용융도금강판을 제조하기 위한 질소구름(장막)를 형성하기 위한 장치 및 이를 이용한 도금강판을 제조하는 방법에 관한 것으로서, 좀더 상세하게 설명하면 아연이나 알루미늄 등과 같은 금속을 강판에 용융 도금하는 장치에서 도금강판을 외부 공기와 차단하기 위해 무산화성 분위기를 효율적으로 형성하기 장치 및 이를 이용한 도금강판의 제조방법에 관한 것이다.The present invention relates to an apparatus for forming a nitrogen cloud (sheet) for producing a hot-dip galvanized steel sheet and a method for manufacturing a plated steel sheet using the same, and more specifically to a metal such as zinc or aluminum The present invention relates to a device for efficiently forming a non-oxidizing atmosphere in order to block a plated steel sheet from outside air in an apparatus for hot-dip plating, and a method of manufacturing a plated steel sheet using the same.
강판의 내식성을 확보하고자 하는 일환으로 용융도금강판(Hot-Dip Metal Coated Steel Sheet)이 널리 이용된다. 대표적인 것으로 아연도금강판(GI)은 경제성과 풍부한 자원을 바탕으로 널리 이용되고 있으며, 현재에도 가장 많이 이용되고 있는 도금강판의 한 종류이다. 또한, 이러한 아연도금강판의 내식성을 향상시키고자 많은 연구가 이루어져 그 가운데에서도 55%Al-Zn(일명 Galvalume) 알루미늄도금강판이 1960년대 후반에 제안되어 현재 우수한 내식성과 미려한 외관을 나타내고 있다. Hot-Dip Metal Coated Steel Sheet is widely used as part of securing corrosion resistance of steel sheet. The typical galvanized steel sheet (GI) is widely used on the basis of economical efficiency and abundant resources, and is one of the most used galvanized steel sheets. In addition, many studies have been made to improve the corrosion resistance of such galvanized steel sheet, and among them, 55% Al-Zn (aka Galvalume) aluminum plated steel sheet was proposed in the late 1960's and shows excellent corrosion resistance and beautiful appearance.
이러한 알루미늄 도금강판은 아연 도금강판과 비교하여 내식성과 내열성이 우수하여 자동차 머플러, 가전제품, 내열소재 등에 많이 적용되고 있다. The aluminum plated steel sheet has excellent corrosion resistance and heat resistance compared to galvanized steel sheet, and is widely applied to automobile mufflers, home appliances, and heat resistant materials.
예컨대 일본국 특개소 57-47861호의 철 중에 Ti을 함유하는 알루미늄강판, 특개소 63-184043호의 철 중에 C, Si, Cu, Ni 및 소량의 Cr을 함유하는 알루미늄 도금강판, 특개소 60-243258호의 망간 0.01~4.0%, 티타늄0.001~1.5%, 실리콘3.0~15.0%을 함유한 알루미늄도금강판 등이다. For example, an aluminum steel sheet containing Ti in iron of Japanese Patent Laid-Open No. 57-47861, an aluminum plated steel sheet containing C, Si, Cu, Ni and a small amount of Cr in iron of Japanese Patent Laid-Open No. 63-184043, of Japanese Patent Laid-Open No. 60-243258 An aluminum plated steel sheet containing 0.01 to 4.0% of manganese, 0.001 to 1.5% of titanium, and 3.0 to 15.0% of silicon.
또한 알루미늄과 철과의 반응에 의한 Fe - Al 합금층의 성장이나 철속으로 In addition, the growth of Fe-Al alloy layer by the reaction of aluminum and iron
알루미늄금속의 급속한 확산 등을 억제하기 위해서 알루미늄 도금욕에 10%이하의 Si를 첨가하고 있다. 이 방법에 의해 제조된 도금강판은 비교적 가공성 및 내열성이 우수하므로 자동차의 머플러, 온수기, 난방기, 전기밥솥 내피 등과 같은 내열부품에 많이 사용되고 있다. In order to suppress the rapid diffusion and the like of the aluminum metal, Si of 10% or less is added to the aluminum plating bath. Since the plated steel sheet produced by this method is relatively excellent in workability and heat resistance, it is widely used in heat-resistant parts such as mufflers, water heaters, heaters, rice cookers, and the like of automobiles.
그러나 합금층의 형성 억제를 위하여 첨가되는 실리콘이 경우에 따라서는 오히려 도금강판의 표면외관을 해쳐 선명하지 못한 외관을 갖게되는 문제점이 발생되는데, 이러한 실리콘 첨가에 의한 표면외관의 손상은 소량의 마그네슘의 첨가로 어느 정도 해결되는 것으로 알려져 있다.However, the silicon added to suppress the formation of the alloy layer in some cases, rather than damage the surface appearance of the plated steel sheet has a problem that has a clear appearance, the damage of the surface appearance by the addition of silicon is a small amount of magnesium It is known to solve to some extent by addition.
또한 최근에는 특히 자동차 배기가스계에 사용되는 부품의 수명의 장기화에 따라 알루미늄이 도금되는 강판에 Cr을 함유하는 강판이 개발되어지고 있다. 예를 들면 일본국 특개소 63-18043호의 1.8 - 3.0 %의 크롬을 함유하는 도금강판이나 특개소 63-47456호와 같이 Cr을 2-3%함유하는 강판 등이다. In recent years, steel sheets containing Cr have been developed in steel sheets on which aluminum is plated, in particular, as the life of components used in automobile exhaust systems is prolonged. For example, a plated steel sheet containing 1.8 to 3.0% of chromium in Japanese Patent Laid-Open No. 63-18043, or a steel sheet containing 2-3% Cr as in Japanese Patent Laid-Open No. 63-47456.
한편, 위와 같은 Zn-Al 합금도금강판의 경우, 가공 절단부가 충분하게 내식성을 발휘하지 못하는 단점이 나타난다. 이러한 현상은 절단 단면부에 노출된 면이 아연-알루미늄 합금층으로 인하여 철의 부식을 막는 희생방식성 아연의 저감으로 인한 내식성 저하의 요인에 기인된 것이다. 또한, Zn-Al합금도금강판은 이종의 합금상을 가지지 않는 형태로 도금층이 형성됨으로 굴곡가공이나 드로잉 가공후 사용시에 경계면이 취약하여 가공후 내식성이 열하되는 단점을 가지고 있다. On the other hand, in the case of the Zn-Al alloy plated steel sheet as described above, there is a disadvantage that the cut processing does not exhibit sufficient corrosion resistance. This phenomenon is due to the deterioration of the corrosion resistance due to the reduction of the sacrificial anti-corrosive zinc that the surface exposed to the cut end portion prevents corrosion of iron due to the zinc-aluminum alloy layer. In addition, Zn-Al alloy plated steel sheet has a disadvantage in that the plating layer is formed in a form that does not have a heterogeneous alloy phase, so that the interface is weak at the time of use after bending processing or drawing processing, thereby deteriorating corrosion resistance after processing.
이러한 특성을 개선하고자 한국등록특허 제10-0586437호의 내식성이 우수한 Zn-Al-Mg-Si 합금도금강판의 강재에 있어서 Al 45~70 중량%, Mg 3~10중량%, Si 3~10중량%, 나머지가 Zn 및 불가피한 불순물로 이루어지는 도금욕에서 도금처리하는 방법이 제안된 바 있고, 한국등록특허 10-0928804호에는 내식성 및 가공성이 우수한 Zn-Al-Mg 합금도금강판 등이 제안되었다. In order to improve these characteristics, Al 45-70 wt%, Mg 3-10 wt%, Si 3-10 wt% in the steel of Zn-Al-Mg-Si alloy plated steel sheet having excellent corrosion resistance of Korea Patent No. 10-0586437 In the present invention, a method of plating in a plating bath made of Zn and unavoidable impurities has been proposed. In Korean Patent No. 10-0928804, a Zn-Al-Mg alloy plated steel sheet having excellent corrosion resistance and workability has been proposed.
용융도금강판에서 표면품질은 도금욕의 조성뿐 아니라, 도금욕으로부터 나오는 강판의 표면을 제어하는 기술에 따라 좌우되기도 한다. 용융도금층의 성분들, 예컨대 Zn, Al, Mg 등은 대기중의 산소와 결합하여 산화피막을 형성하는데 이는 도금강판의 표면품질을 저하시키는 요인이다. 특히, 도금욕에 Mg을 첨가한 도금강판 제품이 일반적인 GI, GL 도금욕의 경우보다 표면의 외관품질에 문제를 발생시키는 경우가 많은데, 이는 Mg원소의 특성인 산화성 때문에 발생되는 문제이다. Mg는 산화성이 매우 높은 원소로써 온도가 높은 도금욕조에서는 산화 반응성이 특히 높아지며 이로 인하여 기타원소와 결합한 산화물 또는 Mg 미세산화물이 Strip에 협착되어 도금강판 표면의 품질저하 문제를 발생시킨다.Surface quality in hot-dip galvanized steel sheet depends not only on the composition of the plating bath, but also on the technique of controlling the surface of the steel sheet coming out of the plating bath. The components of the hot dip layer, for example, Zn, Al, Mg, etc., combine with oxygen in the air to form an oxide film, which is a factor of lowering the surface quality of the plated steel sheet. In particular, a plated steel sheet product in which Mg is added to the plating bath is more problematic in appearance quality of the surface than in the case of general GI and GL plating baths, which is a problem caused by oxidative properties of Mg elements. Mg is a highly oxidizing element, and the oxidation reactivity is particularly high in a high temperature plating bath, which causes oxides or Mg fine oxides bound to other elements to be squeezed onto the strip, causing problems of deterioration of the surface of the plated steel sheet.
이러한 문제를 해결하기 위하여 도금욕조(포트)로부터 나오는 용탕에 침적된 strip이 대기중에 노출되어 냉각이 진행되는 구간에 산화를 방지하기 위한 무산화성 분위기를 형성하여 도금하는 방식 및 이를 위한 장치가 종래 잘 알려져 있다. In order to solve this problem, the strip deposited on the molten metal from the plating bath (pot) is exposed to the air, and a method of plating a non-oxidizing atmosphere to prevent oxidation in a section where cooling is performed and a device therefor are well known. Known.
예컨대, 국제공개 WO２０１１／１０２４３４(D1), 일본특허공개５５－１４１５５４(D2), 일본특허공개 ２０１０－２０２９５１(D3), 일본특허공개２００２－３４８６５１(D4), US4,444,814(D5) 및 US4,502,408(D6) 등이다. For example, International Patent Publications WO210,110,448 (D1), Japanese Patent Publication 5,15,155,4 (D2), Japanese Patent Publication 20,020,205,1 (D3), Japanese Patent Publication 20,347,461 (D4), US4,444,814 (D5) and US4,444,814 (D5). 502,408 (D6) and the like.
그런데, Strip이 용탕에 침적된 이후 대기중에 나오는 구간에서 무산화 분위기 조성을 위한 방법 내지는 장치에 있어서는 기존에 방식 내지 장치는 여러가지 많은 문제점이 있다. By the way, in the method or apparatus for forming an oxide-free atmosphere in the section coming out of the atmosphere after the strip is deposited in the molten metal, the conventional method or apparatus has various problems.
즉, 종래 무산화 분위기를 위한 장치는 위 종래기술의 도면(D1의 도 2, D2의도 2, D3의 도 2, D4의 도 3 등 참조) 에서 보듯이 도금용탕의 표면부터 스트립의 도금부착량 조절을 위한 air Knife 장치 전부를 감싸는 Box Type으로 구성되어 있다. That is, the conventional apparatus for the non-oxidizing atmosphere, as shown in the drawings of the prior art (see Fig. 2 of D1, Fig. 2 of D2, Fig. 2 of D3, Fig. 3 of D4, etc.), to adjust the amount of plating deposition on the strip from the surface of the molten metal. Consists of a Box Type that wraps all of the air Knife devices.
도금강판의 제조시 각 도금욕의 온도는 460℃(일반적인 아연-알루미늄도금강판 도금욕), 600℃(갈바륨강판 도금욕) 650℃(알루미늄도금강판 도금욕) 정도 되는데, 밀폐된 Box 형태로 인하여, 내부의 고온의 열기가 대기 중으로 제대로 방출되지 못하고 Box/Vessel 안의 온도를 상승시키게 된다.The temperature of each plating bath is 460 ℃ (general zinc-aluminum plated bath) and 600 ℃ (galvalume steel plate bath) 650 ℃ (aluminum plated bath) due to the sealed box shape. As a result, the hot heat inside is not properly released into the atmosphere and the temperature inside the box / vessel is raised.
종래의 이러한 방식 내지 구조는 실제 공정에서는 아래와 같은 많은 문제점을 야기시킨다.This conventional scheme or structure causes many problems in the following processes.
- 제한된 공간에서의 열로 인한 구조물 변형 -Deformation of structures due to heat in limited space
: Air Knife Rip, Rip, Sink roll Arm 등의 구조물에 열변형을 유발 시킨다.: It causes heat deformation in structures such as Air Knife Rip, Rip, Sink roll Arm.
- Air Knife에 부착된 각종 센서, 모터 등 Air Knife 구동 전기장치의 오작동-Malfunction of Air Knife-driven electric devices such as sensors and motors attached to Air Knife
: 이를 방지하기 위해서는 각종 전기 장치의 온도 상승을 방지하기 위한 냉각 장치를 별도로 구성 해야 하는 문제점. 각종 전기장치의 수명 또한 감소 시킨다.: In order to prevent this problem, a cooling device must be separately configured to prevent the temperature rise of various electric devices. It also reduces the lifetime of various electrical devices.
- 도금 및 부착량 제어 이후 Spangle 제어가 용이하지 못함-Spangle control is not easy after plating and deposition amount control
: 도금된 강판의 표면에 Spangle Size 미세화는 제품 품질에 많은 영향을 미치는데, Spangle을 미세화 하기 위해서는 부착량 제어 후 빠른 냉각이 필수이나 Box Type의 경우 내부의 잠열로 인하여 냉각효율을 저하시킨다. 도금후 Strip의 냉각 속도를 높이기 위하여 Air를 분사하는 냉각기술 이외에 미스트 분사, 금속파우더 분사 등 여러 다른 기술이 실제 사용되어 지고 있는데, Box type 구조는 도금후 냉각을 오히려 방해하는 구조 내지 방식이다. : Refinement of the spangle size on the surface of the plated steel sheet has a great effect on product quality.In order to refine the spangle, rapid cooling is required after controlling the adhesion amount, but in case of box type, cooling efficiency is lowered due to latent heat inside. In addition to cooling technology that injects air to increase the cooling rate of the strip after plating, various other technologies such as mist spraying and metal powder spraying are actually used. The box type structure is a structure or method that hinders cooling after plating.
- 도금욕탕 상부에 발생하는 표면 산화물(Top Dross) 제거가 용이하지 못하다. -It is not easy to remove Top Dross that occurs on top of plating bath.
: 질소가스를 분사하여 무산화성 분위기를 형성하는 목적은 도금용탕 표면에서 산화 발생을 억제하며, 발생된 산화물이 Strip에 흡착되는 것을 방지하는 목적인데, Box Type의 경우 용탕 표면에 발생한 표면산화물(Top Dross )제거가 용이하지 못한 구조이다: The purpose of forming a non-oxidizing atmosphere by injecting nitrogen gas is to prevent oxidation on the surface of plating molten metal and to prevent the generated oxide from adsorbing to Strip. In case of Box Type, surface oxide generated on the surface of molten metal (Top Dross) is not easy to remove
: 무산화성 분위기에서도 실제로 strip의 표면에 산화물은 상당량 발생하며, 이는 주기적으로 인력 또는 로봇장치를 이용하여 제거해야 하나, Box type 구조는 밀폐형으로서, strip의 표면에 산화물 제거를 위한 작업을 위해 개폐식 도어를 설치하여 개폐를 반복해야 하는 문제점이 발생한다. 이러한 경우 반복적인 개폐로 인하여 box 내부의 안정적인 질소 분위기 유지에도 어려움이 있다.: In the non-oxidizing atmosphere, the amount of oxide actually occurs on the surface of the strip, which must be removed periodically by manpower or robot, but the box type structure is hermetically sealed, and it is a retractable door to remove oxide on the surface of the strip. There is a problem that must be repeated to open and close the installation. In this case, it is difficult to maintain a stable nitrogen atmosphere inside the box due to repeated opening and closing.
- 질소 가스 비용 증가-Increased nitrogen gas costs
: Box Type 내부를 질소로 충진하는 방법은 두 가지가 있다. Air Knife에서 도금부착량 제어를 위한 분사되는 질소를 이용하여 충진하는 방법과 외부에서 다른 공급Line을 통하여 공급하는 방안이다.: There are two ways to fill the inside of box type with nitrogen. Air Knife is a method of filling by using injected nitrogen for plating deposition control and supplying from other supply line from outside.
: 실제 연속아연도금라인 Air Knife 에서 분사되는 질소량은 통상 3000~6000m3/hr 수준의 량으로 Box Type 내부 산소를 질소로 충진 하기에는 부족한 수준이며, 앞에서 언급하였듯이 용탕온도에 의한 열을 외부로 방출하기 위해 외부에서 추가적으로 질소 가스를 공급을 실시 하여야 하는데, 이를 위해, Air Knife에서 공급되는 질소 외에 3000~4000m3/hr 수준의 질소를 추가로 공급해 주어야 하며 이는 일반 질소 사용량의 2배 이상으로 제조원가에 상당한 비용으로 작용한다.: The amount of nitrogen injected from the continuous zinc plating line Air Knife is usually 3000 ~ 6000m3 / hr, which is not enough to fill the box type oxygen with nitrogen, and as mentioned earlier, Nitrogen gas should be additionally supplied from outside. To this end, 3000 ~ 4000m3 / hr of nitrogen should be supplied in addition to the nitrogen supplied from Air Knife. Works.
본 발명은 상기의 점을 감안하여 안출된 것으로서, 본 발명의 목적은 용융도금 강판을 제조함에 있어서 도금욕 표면으로부터 나오는 강판에 무산화성 분위기를 형성하기 위한 장치를 제공함을 목적으로 한다.The present invention has been made in view of the above point, and an object of the present invention is to provide an apparatus for forming a non-oxidizing atmosphere in the steel sheet coming from the surface of the plating bath in the production of hot-dip steel sheet.
본 발명의 다른 목적은 표면 외관 및 내식성이 우수한 도금강판을 제조하는 방법을 제공함을 목적으로 한다.Another object of the present invention is to provide a method for producing a plated steel sheet excellent in surface appearance and corrosion resistance.
상기와 같은 목적을 달성하기 위하여 본 발명은 용융도금을 위한 도금욕조 표면과 스트립의 표면에 부착되는 도금금속의 두께를 제어하기 위한 에어나이프 설비 사이에 설치되어 상기 도금욕조에서 올라오는 상기 스트립의 둘레에 질소구름(장막)를 형성하기 위한 장치를 제공하는 것에 의해 달성된다.In order to achieve the above object, the present invention is installed between the plating bath surface for hot-dip plating and the air knife facility for controlling the thickness of the plating metal attached to the surface of the strip circumference of the strip rising from the plating bath It is achieved by providing an apparatus for forming a nitrogen cloud (membrane) in the.
구체적으로 본 발명의 장치는, 상기 도금욕조 표면으로부터 일정거리 이격되어 있고, 반원통형의 몸체를 가지고, 그 저면이 개방되어 상기 도금욕조 표면을 향하며, 상기 몸체의 상면에는 상기 스트립이 통과하는 슬릿이 형성되어 있으며, 상기 몸체의 하단부 둘레에는 외부공기를 차단하기 위해 상기 도금욕조 표면을 향하여 질소가스를 분사하는 하부 가스배출부가 형성되고, 상기 몸체의 저면을 상기 스트립의 폭방향으로 가로질러, 상기 스트립의 양측에 대향 배치되되 상기 스트립을 향해 질소가스를 분사하는 내측가스배출부를 포함하고, 상기 몸체의 내측에는 상기 스트립을 향해 질소가스를 분사하는 복수 개의 분사노즐이 형성된 것임을 특징으로 한다.Specifically, the apparatus of the present invention, the slit through which the strip passes through a spaced apart from the surface of the plating bath, having a semi-cylindrical body, the bottom of which is open toward the plating bath surface, the upper surface of the body And a lower gas discharge part is formed around the lower end of the body to inject nitrogen gas toward the plating bath surface to block external air, and crosses the bottom of the body in the width direction of the strip. It is disposed on both sides of the inner gas discharge unit for injecting nitrogen gas toward the strip, the inside of the body is characterized in that a plurality of injection nozzles for injecting nitrogen gas toward the strip is formed.
다른 관점에서 본 발명은 상기 장치를 이용하여 아연-알루미늄계 합금도금강판을 제조하는 방법을 제시한다. 본 발명의 방법은 아연-알루미늄계 합금도금강판을 아연 35~55중량%, 실리콘 0.5~3중량%, 크롬 0.005~1.0중량%, 마그네슘 0.01~3.0중량%, 티타늄 0.001~0.1중량%, 나머지가 알루미늄 및 불가피하게 포함되는 불순물을 포함하는 상기 도금욕조에서 도금처리함으로써, 가공성과 내식성이 우수한 아연-알루미늄계 합금도금강판을 제조하는 것을 특징으로 한다. 이에 따르면 생산된 도금강판은 표면외관 및 내식성이 우수한 특성을 갖는다.In another aspect, the present invention provides a method of manufacturing a zinc-aluminum alloy plated steel sheet using the apparatus. In the method of the present invention, the zinc-aluminum alloy plated steel sheet is 35 to 55% by weight of zinc, 0.5 to 3% by weight of silicon, 0.005 to 1.0% by weight of chromium, 0.01 to 3.0% by weight of magnesium, and 0.001 to 0.1% by weight of titanium. It is characterized by producing a zinc-aluminum alloy plated steel sheet excellent in workability and corrosion resistance by plating in the plating bath containing aluminum and inevitable impurities. According to this, the produced plated steel sheet has excellent surface appearance and corrosion resistance.
또한 상기 도금욕에는 상기 마그네슘 전체중량을 기준으로 1~10중량%의 칼슘을 더 포함할 수 있다. In addition, the plating bath may further include 1 to 10% by weight of calcium based on the total weight of magnesium.
본 발명의 상기 장치에 의하면, 도금욕조를 빠져나오는 강판의 주위에 질소구름(장막)을 형성하여 상기 강판(스트립)이 에어 나이프설비에 도달하기 전에 외부 공기와의 접촉을 방지하는 효과가 있다. 특히 본 발명의 상기 장치는 몸체의 내측으로 질소가스를 분사하여 몸체의 내부를 전체적으로 질소가스로 채우고, 몸체의 저면부에 형성된 하부 가스배출부를 통해서 상기 몸체의 저면 개방부를 외부공기로부터 질소가스로 차단하며, 도금욕조의 표면으로부터 올라오는 스트립의 양측에서 내측가스배출부를 통해 상기 스트립을 향해 질소가스를 분사하도록 하여, 상기 스트립에 부착된 도금금속을 상기 도금욕조의 표면에서 나오는 순간부터 외부공기로부터 차단하고 있다.According to the apparatus of the present invention, there is an effect of forming a nitrogen cloud (veil) around the steel sheet exiting the plating bath to prevent contact with external air before the steel sheet (strip) reaches the air knife facility. In particular, the apparatus of the present invention is to inject the nitrogen gas into the inside of the body to fill the inside of the body with nitrogen gas as a whole, the bottom opening of the body through the lower gas discharge portion formed in the bottom of the body to block the nitrogen gas from the outside air And injecting nitrogen gas toward the strip through the inner gas discharge portion at both sides of the strip rising from the surface of the plating bath, to block the plating metal attached to the strip from the outside air from the moment of exiting the surface of the plating bath. Doing.
한편, 본 발명의 장치는 상기 슬릿의 양측에 상기 슬릿를 통과하는 상기 스트립의 방향으로 질소가스를 분사하는 상부가스배출부를 추가로 형성할 수도 있다. On the other hand, the apparatus of the present invention may further form an upper gas discharge portion for injecting nitrogen gas in the direction of the strip passing through the slit on both sides of the slit.
이에 의하면, 산소를 포함하는 외부공기가 상기 슬릿를 통하여 상기 몸체의 내부로 진입하는 것을 방지하게 된다. According to this, the outside air containing oxygen is prevented from entering the inside of the body through the slit.
여기서 상기 내측가스배출부는, 질소가스를 배출하는 복수개의 노즐이 길이방향으로 일정 간격 형성된 원형의 파이프본체와 상기 파이프본체의 일측면을 수용하도록 오목한 홈이 길이방향으로 형성된 하우징과, 상기 파이프본체에 대응되는 요홈이 형성되어 상기 파이프본체의 양단부에서 상기 파이프본체가 안착되도록 하는 고정블록을 포함하고, 상기 파이프본체와 상기 하우징에는 질소가스가 이동하는 통로가 각각 1개 이상 형성되어 있는 것일 수 있다. The inner gas discharge part may include a circular pipe body in which a plurality of nozzles for discharging nitrogen gas are formed at regular intervals in a longitudinal direction, and a housing in which a concave groove is formed in the longitudinal direction to accommodate one side surface of the pipe body, and the pipe body. Corresponding grooves are formed to include a fixed block to allow the pipe body to be seated at both ends of the pipe body, the pipe body and the housing may be formed with one or more passages through which nitrogen gas moves.
상술한 바와 같이 본 발명은 도금욕조를 빠져나오는 강판이 에어 나이프를 통과하기 전에 외부 공기와의 접촉을 방지하여 용융도금강판의 품질을 향상시키는 효과가 있다. As described above, the present invention has the effect of improving the quality of the hot-dip galvanized steel sheet by preventing the contact with the outside air before the steel sheet exiting the plating bath passes through the air knife.
또한 도금욕조 및 스트립으로부터 장치의 내부로 전달되는 열을 장치의 외부로 용이하게 배출하는 효과가 있다.In addition, there is an effect to easily discharge the heat transferred to the inside of the device from the plating bath and strip to the outside of the device.
도 1은 본 발명의 일 실시 예에 따른 측면도1 is a side view according to an embodiment of the present invention
도 2는 본 발명의 일 실시 예에 따른 부분확대도2 is an enlarged partial view according to an embodiment of the present invention
도 3은 본 발명의 일 실시 예에 따른 몸체부의 사시도Figure 3 is a perspective view of the body portion according to an embodiment of the present invention
도 4는 본 발명의 다른 실시 예에 몸체부의 부분확대도Figure 4 is an enlarged partial view of the body portion in another embodiment of the present invention
도 5는 본 발명의 다른 실시 예에 따른 몸체부의 사시도5 is a perspective view of a body portion according to another embodiment of the present invention
도 6은 본 발명의 또 다른 실시 예에 내측가스배출부의 사시도Figure 6 is a perspective view of the inner gas discharge unit in another embodiment of the present invention
도 7은 본 발명의 또 다른 실시 예에 따른 내측가스배출부의 분해사시도Figure 7 is an exploded perspective view of the inner gas discharge unit according to another embodiment of the present invention
도 8은 도 6의 A-A'부분의 단면도이다.8 is a cross-sectional view taken along line AA ′ of FIG. 6.
도 9는 본 발명의 다른 실시예 따른 몸체부의 저면도Figure 9 is a bottom view of the body portion according to another embodiment of the present invention
이에 본 발명을 첨부된 도면에 의하여 상세하게 설명한다.The present invention will be described in detail with reference to the accompanying drawings.
본 발명의 일 실시예에 따른 장치에 대해 도면 1 내지 도면 3을 참조하여 설명하면, 본 발명의 장치는 도금욕조 표면(10)에서부터 일정거리 이격되고, 에어나이프설비(2)의 하부에 위치한다. 본 발명 장치는 몸체부(3)를 가진다. 상기 몸체부(3)는 반원통형의 돔 형상으로서, 상면에는 도금되어진 스트립(100)이 통과하는 슬릿(32)이 몸체부(3)의 길이방향으로 연장 형성되어 있다. 이러한 슬릿(32)은 상기 스트립(100)의 두께 및 폭보다는 크게 형성되어 진다. 몸체부(3)는 철판으로 제작되어 질 수 있다.Referring to Figures 1 to 3 with respect to the device according to an embodiment of the present invention, the device of the present invention is spaced a certain distance from the plating bath surface 10, it is located below the air knife facility (2) . The device of the invention has a body 3. The body portion 3 is a semi-cylindrical dome shape, the upper surface is formed with a slit 32 through which the plated strip 100 passes in the longitudinal direction of the body portion (3). The slit 32 is formed larger than the thickness and width of the strip (100). Body portion 3 may be made of iron plate.
이러한 몸체부(3)의 저면은 도금욕조의 표면(10)를 향해 개방되어있다. 또한 몸체부(3)의 저면 사각 테두리에는 도금욕조의 표면(10)을 향해 질소가스를 분사하는 하부가스배출부(33)가 형성되어 있다. 이러한 하부가스배출부(33)는 일명 에어커튼이라는 장치와 유사하며, 압축된 질소가스를 슬릿(33a, 도면 9참조)을 통해 하부로 분사하여 공기막(에어커튼)을 형성하여 상기 하부가스배출부(33)의 안쪽과 바깥쪽을 외부공기로부터 차단시킨다.The bottom of this body part 3 is open toward the surface 10 of the plating bath. In addition, a bottom gas discharge portion 33 for injecting nitrogen gas toward the surface 10 of the plating bath is formed at the bottom edge of the body 3. The lower gas discharge part 33 is similar to a device called an air curtain, and sprays compressed nitrogen gas downward through a slit 33a (see FIG. 9) to form an air film (air curtain) to form the lower gas discharge part. The inside and outside of (33) are isolated from outside air.
본 발명의 장치는 상기 몸체(3)의 내측으로 질소가스를 분사하는 복수개의 노즐(34)를 포함한다. 상기 노즐(34)들은 상기 몸체(3)의 중심방향으로 질소가스를 분사하여 몸체(3)의 내부에 질소구름(S)를 형성하게 된다. The apparatus of the present invention comprises a plurality of nozzles 34 for injecting nitrogen gas into the body 3. The nozzles 34 form nitrogen clouds S in the body 3 by injecting nitrogen gas toward the center of the body 3.
또한 본 발명의 장치는 상기 몸체(3)의 저면을 상기 스트립(100)의 폭방향으로 가로질러, 상기 스트립(100)의 양측에 대향 배치되되 상기 스트립(100)을 향해 질소가스를 분사하는 내측가스배출부(31)를 포함한다. 스트립(100)이 상기 도금욕조의 표면(10)으로부터 나오는 순간부터 질소가스를 분사하여, 산소가 상기 스트립(100)의 표면에 영향을 미치는 것을 원천적으로 차단하게 된다. 또한 스트립(100)에서 방출되는 열기를 장치의 외부로 배출하는 효과도 있다. 즉, 본 발명의 장치는 도금욕조표면(10)에서부터 이격 설치되어 있고, 하면이 개방되어 있기 때문에, 상기 노즐(34) 및 내측가스배출부(31)로부터 분사되는 질소가스에 의해, 상기 스트립(100) 및 용탕(1)에서 방출되는 열이 외부로 용이하게 배출될 수 있게 되는 것이다. In addition, the apparatus of the present invention crosses the bottom surface of the body 3 in the width direction of the strip 100, the inner side is disposed opposite to both sides of the strip 100 to inject nitrogen gas toward the strip 100 It includes a gas discharge portion 31. Nitrogen gas is injected from the moment when the strip 100 emerges from the surface 10 of the plating bath, thereby preventing oxygen from affecting the surface of the strip 100. It also has the effect of discharging the heat emitted from the strip 100 to the outside of the device. That is, since the apparatus of the present invention is spaced apart from the plating bath surface 10, and the lower surface is open, the strips are formed by the nitrogen gas injected from the nozzle 34 and the inner gas discharge part 31. 100) and the heat emitted from the molten metal 1 can be easily discharged to the outside.
상기 노즐(34), 하부가스배출부(33) 및 내측가스배출부(31)로부터 분사되는 질소가의 압력을 각각 얼마만큼 조절하느냐 하는 것은 스트립(100)의 이동속도, 도금부착량 등에 따라 가변적이며, 당업자에게는 자명한 사항이다. How much the pressure of the nitrogen gas injected from the nozzle 34, the lower gas discharge portion 33 and the inner gas discharge portion 31, respectively, is controlled according to the moving speed of the strip 100, the plating deposition amount, and the like. This is obvious to those skilled in the art.
일반적으로 도금욕조를 빠져나오는 강판에 질소를 분사하여 무산화성 분위기를 형성하는 것은 앞서 살펴본 바와 같이, 이미 공지된 기술이다(D1 내지 D6). 하지만 종래 기술에서 언급한 바와 같이 강판의 도금량을 조절하는 설비를 포함하는 밀폐된 공간(박스 형태와 같은)에 형성한 후 질소를 주입하게 되면 용탕의 열이 외부로 배출되지 않아 내부의 기계 및 각종 센서의 손상 및 오작동이 발생하게 된다. 또한 도금욕조의 표면에 생성되는 산화물을 주기적으로 제거하는 작업을 위해 밀폐된 공간을 개방해야하기 때문에 장치의 가동을 멈추거나 또는 외부 공기의 유입에 의한 품질 저하를 가져오는 단점을 가지고 있었다.In general, forming a non-oxidizing atmosphere by injecting nitrogen into the steel sheet exiting the plating bath is a known technique (D1 to D6) as described above. However, as mentioned in the prior art, when the nitrogen is injected after forming in a closed space (such as a box) including a facility for controlling the plating amount of the steel sheet, the heat of the molten metal is not discharged to the outside, so that the internal machinery and various Damage and malfunction of the sensor will occur. In addition, since a closed space must be opened for the periodic removal of oxides generated on the surface of the plating bath, the apparatus has a disadvantage in that the operation of the apparatus is stopped or the quality is deteriorated by the inflow of external air.
본 발명의 장치는 스트립(100)에 부착되는 도금금속의 양을 조절하는 에어나이프 설비(2)의 하부에 설치한다. 또한 돔형의 몸체(3)에 의해 감싸지고 몸체(3)의 하단부 테두리에 형성된 하부 가스배출부(33)에서 분사되는 질소에 의해 외기를 차단하도록 한 상태에서 내측가스배출부(31)는 직접 강판(100) 방향으로 질소를 분사하고 나머지 공간은 분사노즐(34)에서 배출되는 질소에 의하여 채워져서 도 1에 도시된 바와 같이 질소에 의하여 형성되는 무산화성 분위기가 생성된 공간(S)이 형성되는 것이다. The apparatus of the present invention is installed at the bottom of the air knife facility 2 that controls the amount of plated metal attached to the strip 100. In addition, the inner gas discharge unit 31 is directly covered with a steel plate in a state surrounded by a dome-shaped body 3 and blocked outside air by nitrogen injected from the lower gas discharge unit 33 formed at the lower edge of the body 3. Injecting nitrogen in the direction (100) and the remaining space is filled with nitrogen discharged from the injection nozzle 34 to form a space (S) in which a non-oxidizing atmosphere formed by nitrogen is formed as shown in FIG. will be.
이러한 질소가스에 의한 장막(S)이 형성된 상태에서는 스트립(100)의 표면에 산소가 접촉하는 것을 방지하면서 외부로의 열 배출이 용이하게 이루어져, 각종 부품(미도시)에 영향을 미치지 않아 손상이나 오작동이 발생하지 않는 것이다.In the state in which the curtain film S formed by the nitrogen gas is formed, heat is easily discharged to the outside while preventing oxygen from contacting the surface of the strip 100, and thus it does not affect various parts (not shown) and thus damage or There is no malfunction.
또한 본 발명의 장치는 도금욕조의 표면(10)에서부터 일정거리 이격되기 때문에 용탕표면산화물을 인력 또는 장치에 의하여 제거하기 위해 장비를 삽입하는 것이 용이하며 이러한 제거작업 중에서도 질소는 지속적으로 분사되어 장치의 가동을 멈추지 않아도 되는 이점이 있게 된다.In addition, since the apparatus of the present invention is spaced apart from the surface 10 of the plating bath by a certain distance, it is easy to insert the equipment to remove the molten surface oxide by manpower or the apparatus, and nitrogen is continuously sprayed during the removal operation. This has the advantage of not stopping.
또한 밀폐된 공간이라도 강판이 용탕에서 빠져나오면서 용탕의 표면에에 형성된 용탕표면산화물이 강판에 부착하거나 마그네슘에 의한 미세산화피막이 형성되는 것을 완전하게 방지할 수 없었으나 본원 발명은 내측가스배출부(31)에서 분사되는 질소가 강판(100)의 방향으로 하향 경사지게 분사되는 것으로 용탕의 표면산화물이 강판(100)의 외측으로 밀리도록하는 힘이 작용하여 용탕표면산화물이 강판(100)에 묻거나 미세산화피막이 발생하는 것을 보다 효율적으로 억제할 수 있는 것이다.In addition, even in an enclosed space, the molten metal surface oxide formed on the surface of the molten metal could not be prevented from adhering to the steel sheet or forming a fine oxide film by magnesium. Nitrogen is injected from the inclined downward direction in the direction of the steel sheet 100 to force the surface oxide of the molten metal pushed out of the steel sheet 100, the molten surface oxide is buried in the steel sheet 100 or fine oxidation It is possible to suppress the occurrence of the film more efficiently.
도면 1, 2 및 4에서 미설명 부호 50은 강판(100)의 양면에 부착하여 도금욕조의 표면에서부터 끌려 올라오는 용융금속에 의해 형성되는 meniscus로서, meniscus에 포함된 용융금속의 양은 강판(100)에 부착하는 도금금속의 두께가 되고, 이는 강판의 이동속도, Air Knife(2)에서 분사되는 질소가스의 압력 등에 의해 조절된다. 내측가스배출부(31)는 meniscus 최표면에서 발생한 Dross를 도금강판에 부착되지 않게 물리적으로 제거하는 역할을 하거나 Dross가 발생하는 산화성 분위기를 억제한다. In FIGS. 1, 2, and 4, reference numeral 50 denotes a meniscus formed by molten metal attached to both surfaces of the steel sheet 100 and drawn up from the surface of the plating bath, and the amount of molten metal contained in the meniscus is the steel sheet 100. It becomes the thickness of the plated metal attached to the, it is controlled by the moving speed of the steel sheet, the pressure of nitrogen gas injected from the air knife (2). The inner gas discharge part 31 serves to physically remove the Dross generated from the meniscus outermost surface so as not to adhere to the plated steel sheet or suppress the oxidizing atmosphere in which the Dross occurs.
도 4 내지 5는 본 발명의 다른 실시 예에 따른 장치를 도시하고 있다. 이를 참조하면, 본 발명의 장치의 몸체(3)의 상면에 형성된 슬릿(32) 양측에서 슬릿(32) 방향으로 질소가스를 분사하는 한 쌍의 상부가스배출부(35)가 추가적으로 형성되어 있다. 4 to 5 show an apparatus according to another embodiment of the present invention. Referring to this, a pair of upper gas discharge parts 35 for injecting nitrogen gas in the direction of the slit 32 from both sides of the slit 32 formed on the upper surface of the body 3 of the apparatus of the present invention are additionally formed.
본 발명의 장치의 상부에 위치하는 에어 나이프설비(2)에서는 비교적 강한 압력으로 질소가 분사되면서 강판(100)의 도금량을 조절하게 되는데, 이렇게 강한 압력으로 분사되는 질소가스는 외기와 혼합되어 와류를 형성하는 원인이 되기도 한다. 이러한 와류는 슬릿(32)를 통하여 몸체(3)의 내부로 진입할 우려가 있으며 이를 방지하기 위하여 슬릿(32)의 위쪽에 상부가스배출부(35)를 형성하여 이로부터 질소가스를 분사하도록 하여 와류에 혼합된 산소가 상기 슬릿(32)을 통해 몸체(3) 내부로 침입하는 것을 방지하도록 하는 것이다.In the air knife installation (2) located in the upper portion of the apparatus of the present invention to control the plating amount of the steel plate 100 while nitrogen is injected at a relatively strong pressure, the nitrogen gas injected at such a strong pressure is mixed with the outside air to vortex It can also form. Such vortices may enter the inside of the body 3 through the slit 32, and in order to prevent this, an upper gas discharge part 35 is formed above the slit 32 to inject nitrogen gas therefrom. It is to prevent the oxygen mixed in the vortex from entering the body 3 through the slit 32.
도면 6 내지 8에는 내측가스배출부(31)의 구성을 예시적으로 도시하였다. 이를 참조하면, 상기 내측가스배출부(31)는, 질소가스를 배출하는 복수개의 노즐(311)이 길이방향으로 일정 간격 형성된 원형의 파이프본체(31a)와 상기 파이프본체(31a)의 일측면을 수용하도록 오목한 홈(314)이 길이방향으로 형성된 하우징(31b)과 상기 파이프본체(31a)에 대응되는 요홈(330)이 형성되어 상기 파이프본체(31a)의 양단부에서 상기 파이프본체(31a)를 안착하도록 되는 고정블록(31c)을 포함한다.6 to 8 exemplarily illustrate the configuration of the inner gas discharge unit 31. Referring to this, the inner gas discharge part 31 may have a circular pipe main body 31a and one side surface of the pipe main body 31a in which a plurality of nozzles 311 for discharging nitrogen gas are formed at regular intervals in the longitudinal direction. A housing 31b having a concave groove 314 formed in the longitudinal direction and a recess 330 corresponding to the pipe main body 31a are formed to accommodate the pipe main body 31a at both ends of the pipe main body 31a. It includes a fixed block (31c) to be.
여기서, 상기 파이프본체(31a)와 상기 하우징(31b)에는 질소가스를 공급하기 위한 통로를 제공하는 질소공급홀(315, 312)이 각각 1개 이상 형성된다. Here, one or more nitrogen supply holes 315 and 312 are provided in the pipe main body 31a and the housing 31b to provide a passage for supplying nitrogen gas.
상기 하우징(31b), 파이프본체(31a) 및 고정블록(31c)들은 나사홀(316, 317)을 관통하는 고정볼트(318)에 의해 고정된다. The housing 31b, the pipe body 31a and the fixing block 31c are fixed by fixing bolts 318 passing through the screw holes 316 and 317.
또한 상기 파이프본체(31a)의 양단부에는 상기 파이프본체(31a)의 외경보다는 큰 외경을 갖는 캡(313)이 형성되어 있다. In addition, caps 313 having an outer diameter larger than the outer diameter of the pipe main body 31a are formed at both ends of the pipe main body 31a.
필요한 경우, 상기 노즐(311)의 분사각도를 조절하기 위해 작업자는 상기 고정볼트(318)를 풀고, 캡(313)을 잡아서 상기 파이프본체(31a)을 일정각도 회전시킬 수 있다. If necessary, in order to adjust the spray angle of the nozzle 311, the operator can loosen the fixing bolt 318, grab the cap 313 to rotate the pipe body 31a by a predetermined angle.
도면 8에서는 상기 파이프본체(31a)에 노즐(311)을 복수 개 형성한 것으로 표현 하였으나 에어커튼과 같이 길게 절개된 슬릿을 통해서 질소가스를 배출하게 할 수도 있을 것이다.  In FIG. 8, a plurality of nozzles 311 are formed on the pipe main body 31a, but nitrogen gas may be discharged through the slits long cut like the air curtain.
도면 9에 슬릿 형태의 내측가스배출부(31)가 몸체(3)에 형성된 상태를 예시적으로 도시하였다. 도면 9는 몸체(3)의 저면에서 바라본 모습으로서, 질소가스를 분출하는 슬릿(33f)이 형성된 내측가스배출부(31)가 지지브리지(39)에 의해 몸체(3)에 고정되어 있다. 9 exemplarily illustrates a state in which the inner gas discharge part 31 having a slit shape is formed in the body 3. FIG. 9 is a view seen from the bottom of the body 3, in which an inner gas discharge part 31 having a slit 33f for ejecting nitrogen gas is fixed to the body 3 by a support bridge 39.
이상의 설명 및 도면에서 외부로부터 본 발명의 장치의 각 가스배출부(31, 33, 35) 및 노즐(34, 311)로의 질소가스를 공급하는 구성은 구체적으로 도시하지는 않았으나, 이는 설계적인 사항으로 당업자에게는 자명한 사항이다. In the above description and drawings, a configuration for supplying nitrogen gas to each of the gas discharge units 31, 33, 35, and the nozzles 34, 311 of the apparatus of the present invention from the outside is not specifically illustrated, but it is a design matter, which is a design matter. It is obvious to me.
이상 설명한 본 발명의 장치의 장점에 대해 종래의 장치(D1-D6)와 대비하여 설명하면 다음과 같다.Advantages of the device of the present invention described above will be described below in comparison with the conventional devices (D1-D6).
1) 본원발명의 장치는 Air Knife 하단에 일부 공간에만 질소장막을 형성하여, 종래 Box Type에서 발생되는 잠열로 인한 구조물 변형 및 도금후 냉각능 저하에 따른 Spangle 미세화 방해 요소가 전혀 없다.1) The device of the present invention forms a nitrogen barrier in only a portion of the bottom of the air knife, there is no spangle minimizing interference element due to the deformation of the structure due to the latent heat generated in the conventional Box Type and the decrease in cooling capacity after plating.
본원발명의 장치는 도금용탕 표면부터 도금 부착량을 제어하는 Air Knife 전체를 감싸는 종래의 장치와 같은 Box 형태가 아니라, 산화가 최초 발생하거나 도금용탕 표면에 Dross가 Strip에 흡착될 수 있는 Air Knife 하단부 구간에 노즐을 이용한 질소 커튼(질소장막)을 형성하여 질소DAM을 형성하는 구조이다. 밀폐된 공간에 질소를 충진하는 방법이 아니라 Air Knife 하단부 구간의 상하부에 질소를 분사하여 질소장막(S)을 형성하고 내부를 질소분위기로 유지하기 때문에 장치내부에서 외부로의 가스 유동이 원활하여 잠열을 유지하지 않는다. The device of the present invention is not a box type like a conventional device that covers the entire air knife that controls the coating amount from the surface of the molten metal, but the lower section of the air knife where oxidation occurs or the dross can be adsorbed onto the strip. It forms a nitrogen curtain (nitrogen film) using a nozzle to form nitrogen DAM. It is not a method of filling nitrogen into the enclosed space, but by injecting nitrogen into the upper and lower portions of the lower section of the air knife to form a nitrogen barrier (S) and maintaining the inside in a nitrogen atmosphere, so that the gas flows smoothly from the inside to the outside of the device. Do not keep.
또한 본원발명의 질소장막(S)은 도면에서 볼 수 있듯이 Air Knife 하단 일부 공간에만 형성되므로, 도금용탕 표면 및 도금이 진행되고 있는 Strip 이외에는 어떠한 구조물(부품)에도 영향을 미치지 않는다. 따라서 종래 Box Type에서 발생하는 열로 인한 구조물 변형 및 각종 센서, 모터 등 Air Knife 구동을 위한 전기장치의 열로 인한 오류의 발생 가능성도 낮다.In addition, the nitrogenous membrane (S) of the present invention is formed only in a part of the bottom of the air knife as can be seen in the drawing, it does not affect any structure (parts) other than the surface of the molten metal plating and the plating is in progress. Therefore, there is a low possibility of error caused by heat of electric devices for driving air knife such as structure deformation and various sensors and motors due to heat generated in the conventional Box Type.
2) 상부 표면 산화물(Top Dross) 제거가 용이하다.2) Easy to remove Top Dross.
본발명의 장치의 경우 도금용탕 표면과 직접접촉 또는 침적된 분위기가 아니라 도금용탕 표면에서 일정거리 이격 되어 있어 이 공간을 통하여 Dross를 인력 또는 로봇을 이용하여 제거 시 어떠한 방해요소도 없게 된다. 또한 Top Dross 제거를 위해 이격된 공간에 장치 또는 도구를 삽입시에도 노즐을 통하여 분사되는 질소커튼 형태의 장막을 항시 유지 하기 때문에 질소 분위기 유지에도 효과 적이다.The device of the present invention is not directly contacted or deposited with the surface of the molten metal, but is spaced a certain distance from the surface of the molten metal, so that there is no obstacle when removing Dross by using a manpower or a robot through this space. In addition, it is effective to maintain nitrogen atmosphere because it always maintains the curtain of nitrogen curtain type sprayed through the nozzle even when the device or tool is inserted in the space to remove Top Dross.
3) 도금용탕 상부 Top Dross의 Strip 흡착 방지 효과3) Strip Adsorption Effect of Top Dross on Plating Molten
Mg 첨가 합금도금강판의 제조에 있어 도금용탕 포트 부위를 질소로 충진 하더라도 실제로 일부 Top Dross 및 산화성이 높은 Mg에 의한 미세 산화 피막을 완벽하게 방지할 수는 없다. 다만 그 양을 현저하게 줄일 수 있기 때문에 질소가스를 분사하는 제조방법을 적용한다.In the manufacture of Mg-added alloy plated steel, even though the plating molten metal pot is filled with nitrogen, it is not possible to completely prevent the micro oxide film by some top cross and high oxidizing Mg. However, because the amount can be significantly reduced, the manufacturing method of injecting nitrogen gas is applied.
본 발명에서는 Top Dross 및 도금용탕 상부의 미세산화 피막을 억제하기 위해 질소 분위기를 형성함과 동시에 이러한 Top Dross 및 미세 산화피막이 Strip에 흡착되는 것을 물리적으로 방지하는 효과도 포함하고 있다.The present invention includes the effect of physically preventing the adsorption of the Top Dross and the fine oxide film on the Strip while forming a nitrogen atmosphere to suppress the Top Oxide and the fine oxide film on the upper surface of the molten metal.
또한 본발명은 하부질소가스배출부(33)에서 아래로 질소 분사시 도금욕조의 측면방향으로 질소장막을 형성시킨다.(도 1 참조) 이는 도금용탕 상부에 부유하고 있는 Top Dross 및 미세 산화 피막의 Strip 부근으로의 이동을 물리적으로 방지하여 Strip에 흡착되지 못하게 하는 효과를 발생시킨다.In addition, the present invention forms a nitrogen barrier in the lateral direction of the plating bath when nitrogen is injected downward from the lower nitrogen gas discharge unit 33 (see FIG. 1). It physically prevents the movement to the vicinity of the strip, so that it does not adsorb on the strip.
따라서 질소 분위기 형성과 동시에 도금 이후 Strip에 흡착을 방지하는 효과를 내는 본 발명은 기존 질소 분위기만 형성하여 산화물을 억제하는 종래의 장치와는 차이가 있다.Therefore, the present invention having the effect of preventing adsorption on the strip after plating at the same time as forming the nitrogen atmosphere is different from the conventional apparatus for suppressing the oxide by forming only the existing nitrogen atmosphere.
4) 질소 가스 비용 절감4) Nitrogen Gas Cost Reduction
본원발명의 장치는 Air Knife 하단에 필요한 일부 공간에 대해서만 질소분위기를 형성 시키기 때문에, 하부질소가스배출부(33)에서 나오는 적은양의 질소만으로도, 질소 장막을 유지할 수가 있으며, 상압보다 높은 압력으로 유지하면서 질소를 공급하는 종래의 Box Type 보다 효율적이다. Since the device of the present invention forms a nitrogen atmosphere only for a part of the space required at the bottom of the air knife, even with a small amount of nitrogen emitted from the lower nitrogen gas discharge unit 33, the nitrogen membrane can be maintained and maintained at a pressure higher than normal pressure. It is more efficient than the conventional box type that supplies nitrogen.
따라서 종래의 Box Type 내부를 질소로 충진하는 방법 대비하여 본 발명이 질소 사용량도 절감이 가능하다. 또한 동일한 양의 질소라 하더라도 본원발명이 종래의 방식보다 훨씬 효과적인 산화물 생성억제, 흡착방지 효과를 나타낼 수 있는 제조 방식이다.Therefore, compared to the method of filling the inside of the conventional Box Type with nitrogen, the present invention can also reduce the nitrogen usage. In addition, even if the same amount of nitrogen, the present invention is a production method that can exhibit a more effective oxide production inhibitory, adsorption prevention effect than the conventional method.
한편, 본 발명은 상기 장치를 이용하여, 아연-알루미늄계 합금도금강판을 아연 35~55중량%, 실리콘 0.5~3중량%, 크롬 0.005~1.0중량%, 마그네슘 0.01~3.0중량%, 티타늄 0.001~0.1중량%, 나머지가 알루미늄 및 불가피하게 포함되는 불순물을 포함하는 상기 도금욕조에서 도금처리함으로써, 가공성과 내식성이 우수한 아연-알루미늄계 합금도금강판을 제조하는 방법을 제공한다. On the other hand, the present invention, using the above device, zinc-aluminum alloy plated steel sheet 35 to 55% by weight of zinc, 0.5 to 3% by weight of silicon, 0.005 to 1.0% by weight of chromium, 0.01 to 3.0% by weight of magnesium, 0.001 to Provided is a method for producing a zinc-aluminum alloy plated steel sheet excellent in workability and corrosion resistance by plating in the plating bath containing 0.1% by weight, the remainder of which is aluminum and inevitably contained impurities.
본 발명은 상기와 같은 도금조성을 갖는 도금욕조에서 도금되는 아연-알루미늄계 합금도금강판에 도금욕조 표면에서부터 일정거리 이격된 부분에, 그리고, Air Knife 설비 하단부에서, 질소댐을 형성하여 도금욕조표면에서 산소와 접촉하여 생성된 미세산화피막이 상기 강판에 흡착되는 것을 방지한다. The present invention is a zinc-aluminum-based alloy plated steel plate to be plated in the plating bath having the plating composition as described above in a portion spaced apart from the surface of the plating bath, and at the bottom of the air knife installation, by forming a nitrogen dam on the surface of the plating bath The fine oxide film produced in contact with oxygen is prevented from adsorbing to the steel sheet.
본 발명의 방법에서 도금욕조는 35~55중량%의 아연을 포함한다. 아연은 소지철보다 희생방식성을 가져 부식을 억제하는 역할을 한다. 35 중량% 이상의 확보가 필요한데, 이는 이 이하가 되면 도금욕 유동성 저하 및 내식성 저하가 일어나게 되고 이상이 되면 도금욕의 온도를 상승시켜야 하기 때문에 Top 드로스의 증가와 함께 조업상의 지장을 초래하여 작업성이 나빠지게 된다. 또한, 55 중량% 이상의 경우는 도금강판의 알루미늄 비율 증가로 인한 원가가 상승하여 경제성이 저하하게 된다. In the method of the present invention the plating bath comprises 35 to 55% by weight of zinc. Zinc has a sacrificial anticorrosive property than base iron to prevent corrosion. It is necessary to secure more than 35% by weight. If it is less than this, the plating bath fluidity and corrosion resistance are lowered, and if it is abnormal, the temperature of the plating bath must be increased, resulting in an operational problem with an increase in the top dross. This becomes bad. In addition, in the case of 55% by weight or more, the cost is increased due to the increase in the aluminum ratio of the plated steel sheet, thereby lowering the economic efficiency.
본 발명 도금욕조는 0.5~3.0중량%의 실리콘을 포함한다. 실리콘은 합금층의 성장을 억제하려는 목적과 함께 도금욕의 유동성을 향상시켜서 광택을 부여하는 효과가 있으며 첨가량은 0.5중량% 이상을 첨가해야 한다. 이는 도금층에서 실리콘의 중요한 역할이 소지강판과 알루미늄의 합금층 형성을 제어하는 역할인데, 첨가량이 0.5중량% 이하이면 그 기능이 제한되어 가공성이 현저히 떨어지는 문제점이 발생한다. 반면 3중량% 이상을 첨가하면 도금층의 내식성 향상에 기여하는 인자로 작용하는 Mg2Si 상의 표면상의 과다 생성 및 성장으로 표면이 거칠고, 조기에 표면변색을 야기시키는 현상과 후처리 피복특성을 저해하는 것으로 나타나게 된다. 따라서 실리콘의 첨가량은 0.5~3중량%로 하는 것이 바람직하다. The plating bath of the present invention contains 0.5 to 3.0% by weight of silicon. Silicon has the effect of imparting gloss by improving the fluidity of the plating bath with the purpose of suppressing the growth of the alloy layer, and the amount of addition should be added at least 0.5% by weight. This is an important role of silicon in the plating layer to control the alloy layer formation of the base steel sheet and aluminum, if the addition amount is 0.5% by weight or less, the function is limited and the workability is significantly reduced. On the other hand, the addition of more than 3% by weight of the Mg2Si phase acts as a contributing factor to the improvement of the corrosion resistance of the coating layer, resulting in excessive surface roughness and surface discoloration, premature surface discoloration and post-treatment coating properties appear to be inhibited do. Therefore, it is preferable to make the addition amount of silicone into 0.5 to 3 weight%.
도금욕에 첨가되는 크롬은 도금층 중의 표면에 치밀한 부동태 산화피막을 형성하여 알루미늄도금강판의 내식성을 향상시킬 뿐만 아니라 도금욕 중에 크롬 원소가 균일한 분포를 이루게 됨에 의해 도금층의 결정립을 미세화시키는 작용을 한다. Chromium added to the plating bath forms a dense passivated oxide film on the surface of the plating layer to improve the corrosion resistance of the aluminum plated steel sheet and to form a uniform distribution of chromium elements in the plating bath, thereby miniaturizing the grains of the plating layer. .
아울러 도금층 내에 집적된 일정형태의 Al-Zn-Si-Cr혼재상의 띠(band)를 형성하는 것(도 2)과 도금층내의 크롬 성분은 알루미늄과 반응하여 AlCr2상의 형성으로 가공성 및 가공 후 파단면의 내식성을 향상시키는 작용을 한다. 이러한 크롬의 역할이 상기의 실리콘 함량을 3중량% 이하로 관리되어 도금층내에 실리콘 성분의 침상 형태로 과다 석출되는 것을 제어하는 역할을 하는 요인으로 작용한다.In addition, forming a band of Al-Zn-Si-Cr mixture of a certain type integrated in the plating layer (Fig. 2) and the chromium component in the plating layer reacts with aluminum to form an AlCr2 phase. It acts to improve corrosion resistance. The role of chromium is controlled to 3% by weight or less of the silicon content to act as a factor that controls the excessive precipitation in the form of acicular shape of the silicon component in the plating layer.
이러한 효과를 갖는 크롬의 함량은 0.1 이상 첨가되어야 하는 것으로 알려져 있다. (U.S. Patent No. 3,055,771 to Sprowl) 그러나 본 발명의 방법에서는 크롬의 함량이 0.005 ~ 1.0 중량% 이다. 크롬의 함량이 0.005 중량% 이하이면 도금욕 중에 균일하게 분포되는 효과가 적고, 1.0중량% 이상일 경우에는 크롬 함량이 증가함에 따라 도금욕의 온도 상승이 필요하며 도금욕의 온도가 상승됨에 따라 드로스(dross)가 증가되고, 이 드로스가 도금강판 표면에 부착되어 외관이 손상되는 문제점이 있다. 따라서 크롬의 첨가량은 0.005~1.0중량%인 것이 바람직하다.It is known that the content of chromium having such an effect should be added at least 0.1. (U.S. Patent No. 3,055,771 to Sprowl) However, in the method of the present invention, the content of chromium is 0.005 to 1.0% by weight. If the content of chromium is less than 0.005% by weight, there is little effect of uniform distribution in the plating bath. If the content of chromium is more than 1.0% by weight, the temperature of the plating bath is required to increase as the content of chromium increases. (dross) is increased, there is a problem that the dross is attached to the plated steel sheet surface damage appearance. Therefore, it is preferable that the addition amount of chromium is 0.005 to 1.0 weight%.
본 발명의 도금욕조는 또한 마그네슘을 0.01~3.0중량% 포함한다. 상기 크롬과 함께 첨가되는 마그네슘은 도금층에 접하고 있는 공기 중의 산소와 결합하여 부동태 피막을 형성하여 합금층 내부로 산소가 확산되는 것을 방지하고, 추가적인 부식현상을 저지하여 내식성을 개선시킨다. 도금층중의 마그네슘과 실리콘 성분의 반응으로 형성된 Mg2Si 상(도 1, 2 참조)과 마그네슘과 아연의 반응으로 형성된 MgZn2 상의 존재는 부식이 진행되는 과정에서 아연의 희생방식성과 함께 국부전지의 형성으로 부식속도를 저감하는 역할을 하게 된다. 또한 알루미늄과 반응하여 산소의 확산을 차단하는 효과가 있어 가공 후 전단면(剪斷面) 내식성을 현저히 개선시킨다.The plating bath of the present invention also contains 0.01 to 3.0% by weight of magnesium. Magnesium added with the chromium combines with oxygen in the air in contact with the plating layer to form a passivation film to prevent the diffusion of oxygen into the alloy layer and to prevent further corrosion to improve corrosion resistance. The presence of the Mg 2 Si phase (see FIGS. 1 and 2) formed by the reaction of magnesium and silicon in the plating layer and the MgZn 2 phase formed by the reaction of magnesium and zinc are corroded by formation of a local battery along with the sacrificial corrosion resistance of zinc in the course of corrosion. It is to reduce the speed. In addition, there is an effect of blocking the diffusion of oxygen by reacting with aluminum, significantly improving the shear corrosion resistance after processing.
만일 마그네슘의 첨가량이 0.01중량% 이하이면 분산도 및 산화특성으로 인한 내식성 개선 효과가 적고, 3.0중량%를 초과하면 도금욕이 포화됨과 동시에 용융점이 높아져서 작업성이 저하되고 지속적인 상부드로스의 발생으로 표면품질이 저하하는 문제점으로 제조원가의 상승과 함께 생산공정상의 문제점이 증가하게 된다.If the amount of magnesium added is less than 0.01% by weight, the effect of improving corrosion resistance due to dispersion and oxidation characteristics is small. If the amount of magnesium exceeds 3.0% by weight, the plating bath is saturated and the melting point is increased. As a result of deterioration of surface quality, the production process increases with the increase of manufacturing cost.
그러므로 마그네슘의 첨가량은 0.01~3.0중량%인 것이 바람직하다. Therefore, it is preferable that the addition amount of magnesium is 0.01 to 3.0 weight%.
본 발명의 도금욕조는 또한 칼슘을 마그네슘 중량비의 1~10중량% 포함한다. 상기 마그네슘, 크롬과 함께 첨가되는 칼슘은 도금용탕 계면에 발생하는 마그네슘 산화물의 생성을 억제함으로 인하여 마그네슘 미세산화 피막이 도금강판 표면에 부착되어 외관품질을 저해하는 현상을 방지한다. The plating bath of the present invention also contains calcium 1 to 10% by weight of magnesium. The calcium added together with the magnesium and chromium prevents the phenomenon of inhibiting the production of magnesium oxide generated at the surface of the molten metal by causing the magnesium microoxide film to adhere to the surface of the plated steel sheet to inhibit the appearance quality.
Mg용탕에 Ca, Be, Al등을 첨가할 경우 고온에서도 용탕의 산화 및 발화가 상당히 억제되는 것으로 알려져 있다. 칼슘을 첨가하여 용탕의 산화력을 억제하는 방법의 메커니즘은 칼슘 첨가에 의해 Mg용탕의 발화온도는 200℃ 이상 증가하는데 칼슘의 첨가에 의해 Mg합금의 발화온도가 상승하는 것은 일반적으로 표면에 형성되는 산화층이 다공질의 산화층에서 치밀한 산화층으로 변화하여 산소의 유입을 효과적으로 차단 가능하다 When Ca, Be, Al, etc. are added to the Mg molten metal, it is known that oxidation and ignition of the molten metal are significantly suppressed even at high temperatures. The mechanism of the method of suppressing the oxidizing power of the molten metal by adding calcium is that the ignition temperature of the Mg molten metal increases by 200 ° C or more due to the addition of calcium. An increase in the ignition temperature of the Mg alloy due to the addition of calcium generally forms an oxide layer formed on the surface. It is possible to effectively block the inflow of oxygen by changing from the porous oxide layer to the dense oxide layer.
만일 칼슘의 첨가량이 마그네슘의 중량%대비 1중량% 이하이면 분산도가 낮아지고 및 MgO 산화피막의 억제효과가 적고 마그네슘 중량%대비 10중량%를 초과하면 알루미늄, 칼슘의 금속간 화합물 생성에 의한 도금층 가공성 저하를 유발 할 수 있다. 그러므로 칼슘의 첨가량은 마그네슘 중량비의 1~10중량%인 것이 바람직 하다. If the amount of calcium added is less than 1% by weight of magnesium, the dispersibility is low, and the inhibitory effect of the MgO oxide film is less, and when the amount of calcium exceeds 10% by weight of magnesium, the plating layer is formed by the intermetallic compound generation of aluminum and calcium. It may cause deterioration of processability. Therefore, the amount of calcium added is preferably 1 to 10% by weight of the magnesium weight ratio.
더해서, 본 발명에 있어서는 도금층의 외관 및 도금층의 꽃무늬 형상인 스팽글(Spangle)의 미세화를 위해서 티타늄을 0.001~0.1 중량%를 포함한다. 티타늄의 첨가량이 0.001 중량% 이하이면 강판상의 분산도가 떨어지며, 0.1 중량% 이상이면 도금욕의 용해가 용이하지 못하며 그 효과성의 향상에 영향을 주지 못하였다.In addition, in this invention, 0.001 to 0.1 weight% of titanium is included in order to refine | miniaturize the spangle which is the external appearance of a plating layer and the floral pattern shape of a plating layer. If the added amount of titanium is less than 0.001% by weight, the dispersibility of the steel sheet is lowered, and if the amount of titanium is more than 0.1% by weight, the plating bath is not easily dissolved and does not affect the improvement of the effectiveness.
본 발명은 종래의 Galvalume 도금강판인 알루미늄과 아연, 실리콘을 함유하는 도금욕에 크롬과 마그네슘, 칼슘, 티타늄을 동시에 적절한 조성으로 첨가하여 핵생성 기회를 많이 만들어줌으로써 스팽글(spangle)을 미세화 한다는 것에 근거한다. The present invention is based on miniaturizing a spangle by adding chromium, magnesium, calcium, and titanium to a plating bath containing aluminum, zinc, and silicon, which are conventional galvalume-plated steel, in an appropriate composition at the same time, thereby creating many opportunities for nucleation. do.
즉 첨가된 성분들은 용탕내에서 강판이 도금처리된 이후에 도금층 내에 분산되어 Mg2Si상, MgZn2상, AlCr2상 등의 무수한 핵을 생성함으로써 도금재가 응고하는 과정 중 결정입계간 상호 간섭하는 작용을 해서 결정립의 성장을 제어하는 역할을 하게 된다. That is, the added components are dispersed in the plating layer after the steel plate is plated in the molten metal to form a myriad of nuclei such as Mg 2 Si phase, MgZn 2 phase, AlCr 2 phase, and the like to interfere with each other between grain boundaries during the solidification of the plating material. To control growth.
따라서 미려한 표면외관이 확보되며 입계간 부식을 억제하여 내식성이 강화되는 효과가 더불어 발휘된다. 또한 알루미늄과 철과의 합금층 성장을 억제하여 가공성이 우수한 도금피막층이 형성되는 것이다. Therefore, a beautiful surface appearance is secured and the corrosion resistance is enhanced by suppressing inter-granular corrosion. In addition, it is possible to suppress the growth of the alloy layer of aluminum and iron to form a plated coating layer excellent in workability.
한편, 도금욕 용탕내 입욕할 때의 소지강판의 온도는 570~650℃, 용탕온도는 550~650℃로 설정하는 것이 바람직하다. On the other hand, it is preferable to set the temperature of the steel plate at the time of bathing in a molten plating bath to 570-650 degreeC, and the molten metal temperature to 550-650 degreeC.
소지강판의 입욕온도가 550℃ 이하가 되면 도금욕의 유동성이 떨어져 도금피막의 외관이 불량해지고 도막밀착성이 저하되며, 반면 650℃ 이상이 되면 소지강판의 열적 확산이 빨라져서 합금층의 이상 성장을 초래하게 되어 가공성이 떨어짐과 동시에 용탕내 Fe산화물층이 과다 생성되는 문제점이 발생되기 때문이다. If the bath temperature of the steel sheet is 550 ℃ or less, the fluidity of the plating bath is reduced, and the appearance of the plating film is poor, and coating adhesion is degraded. On the other hand, if the temperature is over 650 ℃, thermal diffusion of the steel sheet is accelerated, resulting in abnormal growth of the alloy layer. This is because the workability is deteriorated and at the same time, a problem of excessive generation of the Fe oxide layer in the molten metal occurs.
도금부착량은 편면기준으로 20~100g/㎡로 하는 것이 바람직한데, 만일 도금부착량을 20g/㎡ 이하로 하면 부착량을 제어하는 에어 나이프 설비의 공기압력이 과다하게 증가되어 도금부착량의 편차가 발생되며 이와 함께 용탕내 표면산화물의 급속한 증가로 인해 피막의 외관 손상 및 산화 드로스의 부착이 발생된다. It is preferable to set the plating deposition amount on the basis of one side of 20 ~ 100g / ㎡. If the plating deposition amount is below 20g / ㎡, the air pressure of the air knife equipment that controls the deposition amount is excessively increased, which causes variation in plating deposition amount. Along with this, the rapid increase in surface oxides in the melt results in damage to the appearance of the coating and deposition of oxide dross.
또한 100g/㎡ 이상이 되면 합금층이 과다 형성되어 가공성이 현저하게 저하되는 문제점이 있다. In addition, when more than 100g / ㎡ there is a problem that the alloy layer is excessively formed and the workability is significantly reduced.
이하, 본 발명을 실시예와 비교예를 대비하여 설명하고자 한다. 실시예를 통하여 본 발명을 더욱 구체화하나 본 발명이 하기의 실시예에 의해 한정되는 것은 아니다. Hereinafter, the present invention will be described in preparation for Examples and Comparative Examples. The present invention is further illustrated by examples, but the present invention is not limited by the following examples.
강판두께 0.8㎜, 폭 120㎜, 길이 250mm크기의 탈지된 냉연강판을 본발명의 청구항 3항에 따른 장치을 이용하여 도금을 실시하였다. 표 1과 같이 도금욕의 조성을 변화시켜 아연-알루미늄계 합금도금강판을 제조하였다. 제조된 아연-알루미늄계 합금도금강판의 편면 도금부착량을 기준으로 한 평가결과를 표 1에 나타내었다. A stripped cold rolled steel sheet having a thickness of 0.8 mm, a width of 120 mm, and a length of 250 mm was plated using the apparatus according to claim 3 of the present invention. By changing the composition of the plating bath as shown in Table 1 to prepare a zinc-aluminum-based alloy plated steel sheet. Table 1 shows the evaluation results based on the single-side plating adhesion amount of the manufactured zinc-aluminum alloy plated steel sheet.
평가항목으로는 내식성 및 가공성 대상으로 하였으며, 내식성은 KSD 9504 시험법에 따라 5%, 35℃ NaCl 염수분무시험 분위기에서 초기 적청 발생시간(5%)으로 비교, 평가하였으며, 가공성은 KSD 0006 시험법에 따라 180ㅀ OT 벤딩(bending)시험을 한 후 발생된 균열(crack)의 폭(파단면의 폭)을 30~50 배율의 입체현미경(stereo microscope)으로 관찰하여 파단면의 폭 크기를 측정함으로써 비교 평가하였다. 합금상의 관찰은 X-선 회절(XRD) 장비를 이용하였다. Corrosion resistance and processability were evaluated. Corrosion resistance was compared with 5% according to KSD 9504 test method and evaluated at initial red blue development time (5%) in 35 ℃ NaCl salt spray test atmosphere. According to the 180 ㅀ OT bending test, the width of the crack (the width of the fracture surface) generated after observing with a stereo microscope of 30 to 50 magnification was measured to measure the width of the fracture surface. Comparative evaluation. Observation of the alloy phase using an X-ray diffraction (XRD) equipment.
구체적인 시험평가방법에 따른 평가결과는 아래와 같다.The evaluation results according to the specific test evaluation method are as follows.
1. 드로스 발생정도 : 도금 조성별 용해 도금시편 제작 후, 도금욕 상부에 발생한 드로스량을 측정한 결과이다. 1. Degree of dross generation: The result of measuring the amount of dross generated on the upper part of the plating bath after the preparation of the molten plating specimen by the plating composition.
◎ : 도금욕 대비 드로스 발생량 5% 이하◎: Dross generation amount less than 5% of plating bath
△ : 도금욕 대비 드로스 발생량 10~20%△: Dross generation amount 10-20% compared to plating bath
X : 도금욕 대비 드로스 발생량 20% 이상X: 20% or more dross generation amount compared to plating bath
2. 표면외관 : 도금층의 표면외관의 스팽글 선명도와 형성 정도를 육안으로 관찰한 결과이다. 2. Surface appearance: It is the result of visual observation of the sequin sharpness and the degree of formation of the surface appearance of the plating layer.
◎ : 스팽글 형성이 뚜렷하고 광택이 높음 ◎: Clear sequin formation and high gloss
△ : 스팽글 형성이 뚜렷하지 않음△: sequin formation is not clear
X : 스팽글 형성이 미약하고 외관이 불량함X: Poor sequin formation and poor appearance
3. 전단면 내식성 : 염수분무시험 1,000시간 실시 후의 적청발생 정도를 평가하였다. 3. Shear surface corrosion resistance: The degree of red blue color development after 1,000 hours of salt spray test was evaluated.
◎ : 적청발생비율 5% 이하◎: less than 5% of red blue
△ : 적청발생비율 10~20%△: Red blue red occurrence rate 10 ~ 20%
X : 적청발생비율 30% 이상X: Red blue reddish rate over 30%
4. 평판 내식성 : 염수분무시험 2,500시간 실시 후의 적청발생 정도를 평가하였다. 4. Corrosion resistance of plate: The degree of red blue color development after 2,500 hours of salt spray test was evaluated.
◎ : 적청발생비율 5% 이하◎: less than 5% of red blue
△ : 적청발생비율 20~30%△: Blue red generation rate 20 ~ 30%
X : 적청발생비율 30% 이상X: Red blue reddish rate over 30%
(표 1)Table 1
Figure PCTKR2016005617-appb-I000001
Figure PCTKR2016005617-appb-I000001
1에 나타난 바와 같이, 본 발명에 따른 장치를 이용하여 도금한 경우의 드로스 발생량이 적음을 알 수 있고, 또한 발명예에 따라 도금한 강판의 가공성 및 내식성이 우수함을 알 수 있다. 즉 발명예의 경우 180° OT 벤딩(bending)시험을 실시한 후에도 발생된 크랙(파단면)이 10~20㎛정도로 비교예의 경우보다 우수한 것으로 판정되었으며, 내식성에 있어서도 발명예의 경우 평단부 적청은 도금부착량이 편면기준 50g/m2에서 3,000시간 이상, 전단부 적청은 1000시간 이상으로 나타나 기존의 조성에 비해 훨씬 우수함을 알 수 있다. 또한 육안 관찰 결과, 본 발명의 장치가 적용된 제조예가 표면외관이 비교예보다 양호한 것으로 나타났다. 이는 스팽글 사이즈가 미세화됨에 따른 결과이다. As shown in Fig. 1, it can be seen that the amount of dross generated in the case of plating using the apparatus according to the present invention is small, and also the workability and corrosion resistance of the steel sheet plated according to the invention example are excellent. That is, in the case of the invention example, even after the 180 ° OT bending test was performed (cracked surface) was determined to be 10 ~ 20㎛ superior to the case of the comparative example, also in the corrosion resistance even in the case of the invention example, in the flat end red blue plating amount At 50g / m 2 on one side, more than 3,000 hours and the red-blue shear part is more than 1000 hours, which is much better than the existing composition. As a result of visual observation, it was shown that the surface appearance of the production example to which the apparatus of the present invention was applied was better than that of the comparative example. This is a result of the miniaturization of the sequin size.

Claims (8)

  1. 용융도금을 위한 도금욕조 표면(10)과 스트립(100)의 표면에 부착되는 도금금속의 두께를 제어하기 위한 에어나이프 설비(2) 사이에 설치되어 상기 도금욕조(1)에서 올라오는 상기 스트립(100)의 둘레에 질소구름(장막)를 형성하기 위한 장치로서, 상기 장치는,The strip provided between the plating bath surface 10 for hot-dip plating and the air knife facility 2 for controlling the thickness of the plating metal attached to the surface of the strip 100 to rise from the plating bath 1 An apparatus for forming a nitrogen cloud (veil) around the periphery of 100), the apparatus comprising:
    상기 도금욕조 표면(10)으로부터 일정거리 이격되어 있고,Spaced a predetermined distance from the plating bath surface 10,
    반원통형의 몸체(3)를 가지고, 그 저면이 개방되어 상기 도금욕조 표면(10)을 향하며, Having a semi-cylindrical body (3), the bottom of which is open to face the plating bath surface (10),
    상기 몸체(3)의 상면에는 상기 스트립(100)이 통과하는 슬릿(32)이 형성되어 있으며, On the upper surface of the body 3 is formed a slit 32 through which the strip 100 passes,
    상기 몸체(3)의 하단부 둘레에는 외부공기를 차단하기 위해 상기 도금욕조 표면(10)을 향하여 질소가스를 분사하는 하부 가스배출부(33)가 형성되고,A lower gas discharge part 33 is formed around the lower end of the body 3 to inject nitrogen gas toward the plating bath surface 10 to block external air.
    상기 몸체(3)의 저면을 상기 스트립(100)의 폭방향으로 가로질러, 상기 스트립(100)의 양측에 대향 배치되어 상기 스트립(100)을 향해 질소가스를 분사하는 내측가스배출부(31)를 포함하고,An inner gas discharge part 31 disposed across the bottom surface of the body 3 in the width direction of the strip 100 so as to be opposite to both sides of the strip 100 to inject nitrogen gas toward the strip 100. Including,
    상기 몸체(3)의 내측에는 상기 스트립(100)을 향해 질소가스를 분사하는 복수 개의 분사노즐(34)이 형성된 것임을 특징으로 하는 장치.The inside of the body (3) is characterized in that a plurality of injection nozzles 34 for injecting nitrogen gas toward the strip 100 is formed.
  2. 제 1항에 있어서, 상기 슬릿(32)의 양측에는 상기 슬릿(32)에서 나오는 상기 스트립(100)의 방향으로 질소가스를 분사하는 상부가스배출부(35)가 추가로 형성됨을 특징으로 하는 장치.2. The apparatus as claimed in claim 1, further comprising upper gas discharge parts (35) for injecting nitrogen gas in the direction of the strip (100) exiting the slit (32) on both sides of the slit (32). .
  3. 제 1항에 있어서, The method of claim 1,
    상기 내측가스배출부(31)는,The inner gas discharge unit 31,
    질소가스를 배출하는 복수개의 노즐(311)이 길이방향으로 일정 간격 형성된 원형의 파이프본체(31a);A circular pipe body 31a having a plurality of nozzles 311 for discharging nitrogen gas formed at regular intervals in the longitudinal direction;
    상기 파이프본체(31a)의 일측면을 수용하도록 오목한 홈(314)이 길이방향으로 형성된 하우징(31b);A housing 31b having a concave groove 314 formed in a longitudinal direction to accommodate one side of the pipe body 31a;
    상기 파이프본체(31a)에 대응되는 요홈(330)이 형성되어 상기 파이프본체(31a)의 양단부에서 상기 파이프본체(31a)를 안착하도록 되는 고정블록(31c); 을 포함하고,A fixed block 31c formed with a recess 330 corresponding to the pipe main body 31a to seat the pipe main body 31a at both ends of the pipe main body 31a; Including,
    상기 파이프본체(31a)와 상기 하우징(31b)에는 질소가스가 이동하는 통로를 제공하는 질소공급홀(315, 312)이 각각 1개 이상 형성되어 있는 것을 특징으로 하는 장치.The pipe body (31a) and the housing (31b) is characterized in that at least one nitrogen supply hole (315, 312) for providing a passage through which the nitrogen gas is moved.
  4. 제 2항에 있어서, The method of claim 2,
    상기 내측가스배출부(31)는,The inner gas discharge unit 31,
    질소가스를 배출하는 복수개의 노즐(311)이 길이방향으로 일정 간격 형성된 원형의 파이프본체(31a);A circular pipe body 31a having a plurality of nozzles 311 for discharging nitrogen gas formed at regular intervals in the longitudinal direction;
    상기 파이프본체(31a)의 일측면을 수용하도록 오목한 홈(314)이 길이방향으로 형성된 하우징(31b);A housing 31b having a concave groove 314 formed in a longitudinal direction to accommodate one side of the pipe body 31a;
    상기 파이프본체(31a)에 대응되는 요홈(330)이 형성되어 상기 파이프본체(31a)의 양단부에서 상기 파이프본체(31a)를 안착하도록 되는 고정블록(31c); 을 포함하고,A fixed block 31c formed with a recess 330 corresponding to the pipe main body 31a to seat the pipe main body 31a at both ends of the pipe main body 31a; Including,
    상기 파이프본체(31a)와 상기 하우징(31b)에는 질소가스가 이동하는 통로를 제공하는 질소공급홀(315, 312)이 각각 1개 이상 형성되어 있는 것을 특징으로 하는 장치.The pipe body (31a) and the housing (31b) is characterized in that at least one nitrogen supply hole (315, 312) for providing a passage through which the nitrogen gas is moved.
  5. 제 3항에 따른 장치를 이용하여, 아연-알루미늄계 합금도금강판을 제조하는 방법에 있어서, In the method for producing a zinc-aluminum alloy plated steel sheet using the apparatus according to claim 3,
    아연-알루미늄계 합금도금강판을 아연 35~55중량%, 실리콘 0.5~3중량%, 크롬 0.005~1.0중량%, 마그네슘 0.01~3.0중량%, 티타늄 0.001~0.1중량%, 나머지가 알루미늄 및 불가피하게 포함되는 불순물을 포함하는 상기 도금욕조에서 도금처리함으로써, 가공성과 내식성이 우수한 아연-알루미늄계 합금도금강판을 제조하는 방법.Zinc-Aluminum alloy plated steel sheet contains 35 to 55% by weight of zinc, 0.5 to 3% by weight of silicon, 0.005 to 1.0% by weight of chromium, 0.01 to 3.0% by weight of magnesium, 0.001 to 0.1% by weight of titanium, and the rest of aluminum inevitably A method of producing a zinc-aluminum alloy plated steel sheet excellent in workability and corrosion resistance by plating in the plating bath containing impurities to be formed.
  6. 제 4항에 따른 장치를 이용하여, 아연-알루미늄계 합금도금강판을 제조하는 방법에 있어서, In the method of manufacturing a zinc-aluminum alloy plated steel sheet using the apparatus according to claim 4,
    아연-알루미늄계 합금도금강판을 아연 35~55중량%, 실리콘 0.5~3중량%, 크롬 0.005~1.0중량%, 마그네슘 0.01~3.0중량%, 티타늄 0.001~0.1중량%, 나머지가 알루미늄 및 불가피하게 포함되는 불순물을 포함하는 상기 도금욕조에서 도금처리함으로써, 가공성과 내식성이 우수한 아연-알루미늄계 합금도금강판을 제조하는 방법.Zinc-Aluminum alloy plated steel sheet contains 35 to 55% by weight of zinc, 0.5 to 3% by weight of silicon, 0.005 to 1.0% by weight of chromium, 0.01 to 3.0% by weight of magnesium, 0.001 to 0.1% by weight of titanium, and the rest of aluminum inevitably A method of producing a zinc-aluminum alloy plated steel sheet excellent in workability and corrosion resistance by plating in the plating bath containing impurities to be formed.
  7. 제 5항에 있어서 상기 도금욕에는 상기 마그네슘 전체중량을 기준으로 1~10중량%의 칼슘을 더 포함함을 특징으로 하는 가공성과 내식성이 우수한 아연-알루미늄계 합금도금강판을 제조하는 방법.The method of claim 5, wherein the plating bath further comprises 1 to 10% by weight of calcium based on the total weight of magnesium.
  8. 제 6항에 있어서 상기 도금욕에는 상기 마그네슘 전체중량을 기준으로 1~10중량%의 칼슘을 더 포함함을 특징으로 하는 가공성과 내식성이 우수한 아연-알루미늄계 합금도금강판을 제조하는 방법.The method of claim 6, wherein the plating bath further comprises 1 to 10% by weight of calcium based on the total weight of magnesium.
PCT/KR2016/005617 2016-05-17 2016-05-27 Apparatus for forming nitrogen cloud in order to manufacture hot-dip metal coated steel sheet having excellent surface quality, and method for manufacturing coated steel sheet by using same WO2017200134A1 (en)

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ES201890066A ES2725126B1 (en) 2016-05-17 2016-05-27 APPARATUS FOR FORMING A CLOUD OF NITROGEN TO MANUFACTURE A STEEL PLATE COATED BY HOT DIPPING WITH EXCELLENT SURFACE QUALITY AND METHOD FOR MANUFACTURING A STEEL PLATE COATED BY HOT DIPPING OF ZINC AND ALUMINUM USING THE MISCELLANEOUS.
DE112016006868.9T DE112016006868B4 (en) 2016-05-17 2016-05-27 A nitrogen cloud forming apparatus for producing a hot-dip coated steel sheet having excellent surface quality and a method of producing a zinc-aluminum hot-dip coated steel sheet using the same
NZ721156A NZ721156A (en) 2016-05-17 2016-05-27 Apparatus for forming nitrogen cloud to produce hot-dip coated steel sheet with excelent surface quality and method for producing zinc-aluminum hot-dip coated steel sheet using the same
GB1817297.3A GB2564365B (en) 2016-05-17 2016-05-27 Apparatus for forming nitrogen cloud to produce hot-dip coated steel sheet with excelent surface quality and method for producing zinc-aluminium hot-dip coate

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