WO1999029918A1 - Appareil d'immersion a chaud en continu et procede correspondant - Google Patents

Appareil d'immersion a chaud en continu et procede correspondant Download PDF

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Publication number
WO1999029918A1
WO1999029918A1 PCT/JP1997/004486 JP9704486W WO9929918A1 WO 1999029918 A1 WO1999029918 A1 WO 1999029918A1 JP 9704486 W JP9704486 W JP 9704486W WO 9929918 A1 WO9929918 A1 WO 9929918A1
Authority
WO
WIPO (PCT)
Prior art keywords
molten metal
pair
rolls
steel strip
continuous
Prior art date
Application number
PCT/JP1997/004486
Other languages
English (en)
Japanese (ja)
Inventor
Hironori Shimogama
Hidetoshi Nishi
Yasunobu Kani
Yoshio Takakura
Hitoshi Okoshi
Mitsuo Nakagawa
Junji Sakai
Original Assignee
Hitachi, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi, Ltd. filed Critical Hitachi, Ltd.
Priority to PCT/JP1997/004486 priority Critical patent/WO1999029918A1/fr
Publication of WO1999029918A1 publication Critical patent/WO1999029918A1/fr

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Classifications

    • 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
    • C23C2/003—Apparatus
    • C23C2/0034—Details related to elements immersed in bath
    • C23C2/00342—Moving elements, e.g. pumps or mixers
    • C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
    • 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
    • C23C2/003—Apparatus
    • C23C2/0036—Crucibles
    • 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

Definitions

  • the present invention relates to a continuous molten metal plating apparatus and a continuous molten metal plating method.
  • the present invention relates to a continuous molten metal plating apparatus and a continuous molten metal plating method for continuously plating a running steel strip.
  • the steel strip heated and annealed in an annealing furnace passes through a snout in a non-oxidizing atmosphere to remove a large amount of about 200 tons of molten metal.
  • the molten metal is put into the molten metal pot, and the molten metal is continuously applied while being passed through a synchro bath in the molten metal bath.
  • JP-A-8-333661 a steel strip is continuously plated by passing a steel strip through an aerial pot in which molten metal is held in the air by electromagnetic force. The type of plating is changed by switching the molten metal supply system to the aerial pot (second conventional technology).
  • JP-A-63-162847 This conventional technology applies a continuous plating to the surface of the steel strip by spraying a molten metal plating solution on the surface where the steel strip of a pair of plating holes provided on the vertical pass line of the steel strip is in contact. It is. The plating type is changed by switching the molten metal supply system to rolls (third conventional technology).
  • other conventional techniques include JP-A-62-192571 and JP-B-58-10984. In this prior art, a molten metal in a molten metal dish holding plate is picked up by an application roll or a pick-up roll, and the molten metal is applied when the roll comes into contact with a steel strip (fourth prior art).
  • the molten metal pot since the molten metal pot is large, it takes several hours to several ten hours to exchange the plating type, which leads to a reduction in the exchange work efficiency, a decrease in the basic unit, or a decrease in the yield.
  • the sink roll table lii material reacts with the molten gold M, and the roll is severely damaged in combination with the roll wear, requiring replacement in 2 to 4 weeks.
  • oxide dross floats on the upper part of the molten metal pot, and iron dross and the like are convected or settled in the middle part of the molten metal bath and the lower part of the molten metal pot. When passing through, these dross are involved, resulting in a problem that the clean and smooth skin is impaired and the surface quality of the steel strip is deteriorated.
  • the second prior art does not require a large molten metal pot unlike the first prior art.
  • the magnetic field is disturbed. Due to the disturbance of the magnetic field, there is a problem that the molten metal leaks from a lower portion of the air port.
  • the magnetic field may be disturbed. Due to the disturbance of the magnetic field, there is a problem that molten metal leaks from the width end of the aerial bot.
  • the aerial pot is a method of holding the molten metal in the air by electromagnetic force, the capacity of the molten metal in the aerial pot is small, and the space between the aerial pot wall and the steel strip is also narrowed.
  • the concentration of dross such as iron dross in the molten metal bath becomes high, and floating dross such as oxide dross remains in the upper part of the air pot, and these dross are involved when passing through the steel strip.
  • This dross entraps a problem that the clean plating surface is impaired and the surface quality of the steel strip deteriorates.
  • the third prior art does not require a large molten metal pot unlike the first prior art. Then, in order to improve the efficiency of the plating solution exchange work, a small amount of molten metal plating solution is sprayed onto a pair of plating rolls provided on a vertical pass line of the steel strip to perform plating. In such a configuration, dross such as iron dross remains inside a small amount of plating solution reservoir above the roll, and dross such as oxide dross floats above the plating solution reservoir. And, because such dross agglomerates, these dross are involved when passing through the steel strip.
  • This dross entails a problem that the clean plating surface is impaired or the steel strip surface is damaged, resulting in inferior steel strip surface quality.
  • a small amount of plating solution is sprayed onto the upper part of the roll, the contact time between the molten metal and the steel strip is short, and sufficient alloying time cannot be secured. Due to the insufficient alloying treatment, the steel strip surface has sufficient strength It is difficult to form a tacky layer, and the surface quality of the steel strip is poor.
  • the contact time between the molten metal and the steel strip is short, and the time for sufficient alloying treatment is reduced. Can not be secured.
  • the alloying treatment is insufficient, it is difficult to form a plating layer having a sufficient strength on the surface of the steel strip, and there is a problem that the surface quality of the steel strip is deteriorated.
  • the roll surface is severely damaged due to the abrasion of the roll and the reaction between the molten metal surface and the molten metal surface. Therefore, it is necessary to change the mouth in a short period of 2 to 4 weeks. Therefore, it may lead to a decrease in work efficiency such as frequent replacement of the nozzles, plating work stoppage during the roll change, deterioration of the basic unit, or a decrease in the yield.
  • a first object of the present invention is to improve the surface quality of a plating layer by reducing the capacity of a molten metal in a compact facility, and ensuring a sufficient alloying time for contact between the molten metal and a steel strip. It is an object of the present invention to provide a continuous molten metal plating apparatus and a continuous molten metal plating method.
  • a second object of the present invention is to provide a continuous molten metal plating apparatus and a continuous molten metal plating apparatus capable of reducing the volume of molten metal in a compact facility, and prolonging the life of the roll to improve operation efficiency. It is to provide a plating method.
  • a third object of the present invention is to provide a continuous molten metal plating apparatus and a continuous molten metal plating method capable of reducing the volume of molten metal with a compact facility and suppressing the deterioration of the quality of the plated layer due to dross. Is to provide. Disclosure of the invention
  • a first object of the present invention is to provide a continuous molten metal plating apparatus for continuously applying molten metal to the surface of a steel strip, comprising: at least a pair of rolls for holding the steel strip; And a molten metal supply device for supplying molten metal so as to form a molten metal bath capable of satisfying a desired alloying treatment time between the pair of nozzles and the steel strip. (First invention).
  • a first object of the present invention is to provide a continuous molten metal plating method for continuously applying molten metal to the surface of a steel strip, wherein the steel strip traveling upward from below is sandwiched by at least a pair of rolls. And a step of forming a molten metal bath between the pair of rolls and the steel strip above the pair of rolls (a second invention).
  • a second object of the present invention is to provide a continuous molten metal plating apparatus for continuously applying molten metal to the surface of a steel strip, wherein at least one pair of rolls for sandwiching the steel strip and a portion below the pair of rolls are provided.
  • the present invention is achieved by providing a tray for collecting a desired molten metal and a molten metal supply device for continuously supplying the molten metal, and using a ceramic material for the pair of roll surfaces (third invention). .
  • a second object of the present invention is to provide a continuous molten metal plating method for continuously applying a molten metal plating to the surface of a steel strip, wherein at least a pair of surface materials is made of ceramics and rolled upward from below. This is achieved by including a step of pinching a steel strip traveling toward the head, a step of continuously supplying molten metal, and a step of collecting a desired molten metal below the pair of rolls (fourth aspect). Invention).
  • a third object of the present invention is to continuously apply a molten metal to a steel strip surface.
  • a continuous molten metal plating apparatus at least a pair of ports for holding a steel strip, means for plating the steel strip with only the pair of rolls while continuously supplying molten metal, This is achieved by providing a tray for collecting a desired molten metal below the rolls of the above, and a molten metal circulating device for feeding the molten metal from the tray to the molten metal supply device and circulating the molten metal.
  • a third object of the present invention is to provide a continuous molten metal plating method for continuously applying molten metal to the surface of a steel strip, wherein at least a pair of rolls sandwiches a steel strip traveling upward from below.
  • FIG. 1 is a longitudinal sectional view of a continuous molten metal plating apparatus according to one embodiment of the present invention.
  • FIG. 2 is a sectional view taken along line AA of FIG.
  • FIG. 3 is a top view of a continuous molten metal plating apparatus according to one embodiment of the present invention.
  • FIG. 4 is a cross-sectional view of a roll structure according to one embodiment of the present invention.
  • FIG. 5 shows a dross recovery apparatus for a continuous molten metal plating apparatus according to one embodiment of the present invention.
  • FIG. 6 shows a continuous molten metal plating apparatus according to an embodiment of the present invention.
  • BEST MODE FOR CARRYING OUT THE INVENTION (1) At least a pair of rolls for holding a steel strip, and a melt capable of satisfying a desired alloying treatment time between the pair of ports and the steel strip above the pair of rolls.
  • a molten metal path can be formed between the pair of rolls and the steel strip, a large-sized molten metal pot is not required, and the required amount of molten metal is reduced. Furthermore, since a pool of molten metal capable of satisfying the desired alloying time can be formed, the contact time between the molten metal bath (the molten metal pool) and the steel strip can be increased. Thus, the time required for the alloying treatment can be sufficiently secured. Therefore, a sufficiently alloyed plating layer can be obtained, and the surface quality of the plating layer can be improved.
  • a molten metal bath capable of satisfying a desired alloying treatment time can be formed between the pair of rolls and the steel strip, so that a large-sized molten metal pot is not required and is required. The amount of molten metal is also reduced. Furthermore, since a molten metal reservoir that can satisfy the desired alloying treatment time can be formed, the molten metal bath (molten metal reservoir) and the steel strip can be contacted. As a result, the time required for the alloying treatment can be sufficiently secured. Therefore, a sufficiently alloyed plating layer can be obtained, and the surface quality of the plating layer can be improved.
  • a pair of rolls for holding the steel strip, a tray for collecting a desired molten metal below the pair of rolls, and a molten metal supply device for continuously supplying the molten metal are provided;
  • At least a pair of rolls for holding the steel strip, a tray for collecting a desired molten metal below the pair of ports, and a molten metal supply device for continuously supplying the molten metal are provided. Therefore, large molten metal pots are not required, and the amount of molten metal required is also reduced. Further, since the material of the surface of the pair of holes is made of a ceramic having excellent corrosion resistance to the molten metal, erosion due to the reaction between the roll material and the molten metal is reduced, and the life of the roll can be extended. Therefore, the interval between roll exchanges becomes longer and the frequency of port exchange becomes less, so that operation efficiency can be improved.
  • the step of recovering a desired molten metal By including the step of recovering a desired molten metal, the capacity of the molten metal can be reduced with a compact facility, and the operation life can be improved by extending the life of the roll. That is, at least a pair of rolls sandwiches a steel strip traveling from below to above, continuously supplies molten metal, and recovers a desired molten metal below the pair of rolls. No molten metal pot is required, and the required amount of molten metal is reduced.
  • the material on the pair of roll surfaces Since the material is made of a ceramic with excellent corrosion resistance to molten metal, erosion due to the reaction between the mouth material and the molten metal is reduced, and the roll life can be extended. For this reason, the roll replacement interval is long and the frequency of mouth replacement is reduced, so that operation efficiency can be improved.
  • At least a pair of rolls sandwich a steel strip running from below to above, continuously supply molten metal to a desired portion, and store a desired molten metal below the pair of rolls. Therefore, a large molten metal pot is not required, and the required amount of molten metal is reduced.
  • the molten metal since the molten metal is circulated so as to supply the molten metal stored below the pair of holes to the desired portion, the molten metal always circulates. Therefore, iron dross and the like do not float and remain in the area where the steel strip is plated. Since plating is performed with clean molten metal at the portion where the steel strip is to be plated, a clean plating layer can be obtained.
  • a molten metal bath (reservoir) is formed in a space between the pair of rolls facing each other via the steel strip and the steel strip, and the steel strip surface is passed through the steel strip. Since the metal is continuously plated, the molten metal porosities for plating the steel strip surface can be eliminated.
  • dross such as iron dross and oxidized dross is introduced into the molten metal bath.
  • the inside of the roll is a metal member and the surface layer is formed of ceramics having corrosion resistance to the molten metal, damage to the roll can be reduced and the service life can be prolonged. It is possible to improve the stay. Further, since the supply of the molten metal to the molten metal bath is performed by switching a plurality of molten metal circulation systems depending on the type of plating, the exchange of the plating solution can be performed easily in a short time. It is possible.
  • FIG. 1 is a longitudinal sectional view of the continuous molten metal plating apparatus used in the present embodiment.
  • FIG. 2 is a cross-sectional view of the continuous molten metal plating apparatus of the present embodiment, which is a cross section taken along line AA of FIG.
  • FIG. 3 is a top view of the continuous molten metal plating apparatus of the present example as viewed from above.
  • the steel strip 1 passes through the snout 13 from the heating furnace 10, and the traveling direction of the steel strip 1 is changed by the deflector roll 11 in the vertical direction. Drive upward from. Plating is performed on the steel strip 1 traveling upward from below. Plating is not performed at the snout 13 force, between the deflector rolls 11 and the portion where the deflector rolls 11 and the steel strip 1 are in contact.
  • a pair of plating rolls 3 facing in the direction perpendicular to the traveling direction of the steel strip 1 were arranged.
  • the pair of plating rolls 3 were arranged so as to sandwich the steel strip 1 that progresses from below to upward. Further, a molten metal bath 16 is formed between the pair of plating rolls 3 and the steel strip 1 above the pair of plating rolls 3.
  • the plating is performed only by the roll portion.
  • the roll portion here includes a portion of the molten metal bath 16 where the steel strip 1 and the molten metal are in contact with each other, and the vicinity of the contact portion between the pair of plating rolls 3 where the molten metal is attached to the surface and the steel strip 1.
  • the steel strip 1 slightly contacts the molten metal at the bottom of Includes items that are not By fixing only with this roll part, the conventional large molten metal pot is not required. Also, there is no need to accumulate a large amount of molten metal in a large molten metal pot, and work can be easily and efficiently performed when changing the type of molten metal. In addition, no plating is performed between the deflector roll 11 and the above-mentioned roll portion.
  • the pair of plating rolls 3 are arranged at the same height.
  • the height may not be exactly the same, but may be changed within a range where the required molten metal bath 16 can be formed.
  • the molten metal is applied to both sides in the thickness direction of the steel strip 1.
  • Supply port 20a is provided.
  • a desired amount of molten metal can be supplied from the supply port 20a by the supply pump 15 to form the molten metal bath 16.
  • the supply site may be three plating rolls or one steel strip, and an appropriate amount of molten metal path 16 may be formed.
  • the alloying treatment time is required to be approximately 0.05 seconds or more, and the required alloying treatment time can be satisfied by forming the molten metal bath 16 of this embodiment. Since the desired alloying time can be satisfied, a sufficiently alloyed plating layer can be obtained.
  • the rotation drive mechanism of the plating roll 3 in this embodiment is a motor 27 that applies a rotation drive force, a spindle 27 a that transmits a rotation force from the motor 27 to the plating roll 3, a power supply and a rotation speed of the motor 27.
  • upper side seals 6 may be provided at both ends of the body length of the pair of plating rolls 3, respectively. By providing the upper side seal 6, it is possible to prevent the molten metal of the molten metal bath 16 from leaking from the end of the body length of the plating roll 3.
  • the plating roll 3 and the upper side plate 6 are reheated by a heating means in order to prevent adhesion of the molten metal.
  • the plating thickness of the steel strip 1 can be adjusted by the plating thickness adjusting spray 2.
  • gas can be blown onto the plated surface of the plated steel strip 1 to remove excess plating and the like and adjust the plating thickness.
  • the space from the heating furnace 22 b heated by the heater 22 to the plating roll 3 via the snout 13 to the plating roll 3 be a non-oxidizing atmosphere.
  • the spray 2 for adjusting the plating thickness may be an air spray.
  • the space including the plating roll 3 and the plating thickness adjusting spray 2 be an oxygen-free atmosphere.
  • the gas injected from the plating thickness adjusting spray 2 is also a non-oxidizing gas, for example, an argon gas, It is desirable to use nitrogen gas.
  • the surface of the steel strip 1 can be prevented from being oxidized, and a good plating surface can be obtained.
  • a molten metal bath (pool) is formed in the space between the pair of rolls opposed to each other via the steel strip and the steel strip, and the steel strip surface is continuously plated by passing the steel strip.
  • a molten metal pot for plating a steel strip surface.
  • the saucer 5 is disposed between a pair of plating rolls 3 and a deflector roll 11 which is one of means for changing the running direction of the steel strip 1 so that the steel strip 1 runs upward from below. It is arranged at the lower part of each of a pair of plating rolls with a slight gap so as not to contact the steel strip 1.
  • the saucer 5 is formed larger than the surface of the plating roll 3 on the side opposite to the steel strip.
  • the molten metal overflowing from the molten metal bath 16 forms a flow through the upper surface of the plating roll 3 toward the surface of the plating roll 3 on the side opposite to the steel strip, It can be collected in the pan 5.
  • the molten metal flows through the upper surface of the plating roll 3 toward the surface of the plating roll 3 on the side opposite to the steel strip and is collected by the tray 5, so that the oxidation of the molten metal on the surface of the plating nozzle 3 is performed. Suppresses layer formation and results in clean molten metal.
  • the molten metal on the surface of the plating roll 3 is further increased. Formation of an oxide layer can be suppressed.
  • the supply site may be three plating rolls or one steel strip, or the tray 5 as described above.
  • the spray nozzle 9 supplies a non-oxidizing gas, for example, an argon gas or a nitrogen gas, and is provided below each of the pair of plating rolls 3.
  • a non-oxidizing gas for example, an argon gas or a nitrogen gas
  • the spray nozzle 9 is installed so that a non-oxidizing gas is blown between the pair of plating rolls 3 and the steel strip 1 from the strike between the tray 5 and the steel strip 1. It is desirable to do.
  • the side molten metal tray 8 collects leakage of molten metal from the space below the plating roll 3 and the steel strip 1 and the outside of the width of the steel strip 1, and the plating port 3 and the steel strip 1 are collected. It is possible to prevent molten metal from leaking from the lower space of the steel strip and the outside of the strip width of the steel strip 1. It is desirable that the side molten metal tray 8 be provided with a moving means so as to be able to move in accordance with the width change of the steel strip 1. By providing this moving means, the work of attaching steel strips 1 of various widths can be performed. Can be. It is also desirable to provide a heating means to prevent the adhesion of the molten metal and to heat the molten metal.
  • a gap adjusting device 23 between plating rolls was used as an interval adjusting means for adjusting the interval between the pair of rolls.
  • the provision of the inter-roll gap adjusting device 23 makes it possible to cope with various plate thicknesses.
  • the surface of the plating roll 3 is preferably made of ceramics.
  • FIG. 4 shows a cross section in which the surface layer of the plating roll 3 is made of ceramics.
  • the roll base material 25 inside the plating roll 3 was formed of a metal material, and the surface layer 26 was made of ceramics having corrosion resistance to the molten metal. With this configuration, the base metal (inside) is not melted by the molten metal, and the roll is damaged only by contact wear with the steel strip 1, so that the life of the nozzle can be extended.
  • the roll change cycle can be extended compared to the conventional sync cycle change cycle.
  • the metal material of the roll base material 25 may be an inexpensive steel material.
  • the surface layer 26 is not formed by a conventional method of depositing ceramics on the surface by thermal spraying or the like, but by depositing ceramics chemically bonded to elements contained in the metal of the roll base material 25. By the formation, the roll base material 25 is not damaged by the molten metal through the ceramic layer.
  • the ceramic may be porous.
  • the ceramic is a boride-based ceramic (for example, FeB) or a carbide-based ceramic having excellent corrosion resistance.
  • a boride-based ceramic or a carbide-based ceramic By using a boride-based ceramic or a carbide-based ceramic, the surface layer 26 is hardly melted by the molten metal, so that the molten metal hardly penetrates up to 25 parts of the roll base material. Therefore, the roll life is extended.
  • the boride-based ceramics include iron boride-based ceramics, which have excellent corrosion resistance to molten metal.
  • a pair of rolls for holding a steel strip, a tray for collecting a desired molten metal below the pair of rolls, and a molten metal supply device for continuously supplying the molten metal are provided, and
  • a ceramic material for the surface of the pair of rolls the capacity of the molten metal can be reduced in a compact facility, and the life of the rolls can be prolonged to improve the operating efficiency.
  • the molten metal circulation port 14 as a molten metal circulation device is for supplying the recovered molten metal to at least one of the receiving tray 5 and the side molten metal receiving tray 8 to a portion where the molten metal is re-attached.
  • a discharge port for discharging molten metal was provided at the bottom of the tray 5 and the bottom of the molten metal tray 8, and the molten metal was recovered from the discharge port to the molten metal circulation port 14 via the molten metal recovery pipe 18. Feed molten metal. Then, the molten metal is supplied again from the molten metal circulation port 14 to the metallized portion by the molten metal supply pump 15 via the molten metal supply pipe.
  • the discharge port of the tray 5 and the side molten metal tray 8 may not be at the bottom, but may be at a position where discharge is possible.
  • At least a pair of plating rolls 3 that sandwich the steel strip, and the molten metal is continuously supplied from the molten metal circulation port 14 to the steel strip 1 with only three pairs of the plating rolls.
  • At least one of a tray 5 and a side molten metal tray 8 for collecting a desired molten metal below the pair of plating holes 3; and a tray 5 and a side molten metal tray 8 Small
  • the molten metal is sent from at least one to the molten metal circulation port 14, and the molten metal is circulated, reducing the volume of the molten metal in a compact facility and reducing the quality of the plated layer due to dross. Can be suppressed.
  • a dross separator 19 was installed between the molten metal circulation port 14 and the portion that collects the molten metal, such as the tray 5 and the side molten metal tray 8.
  • a dross recovery device 19 b installed in the middle of the molten metal recovery pipe 18, dross such as oxidized dross in the recovered molten metal and clean molten metal are separated, and the molten molten metal is melted. It can be returned to metal circulation pot 14.
  • Fig. 5 shows a dross recovery device as an example of a dross separation device.
  • the dross recovery device 19b includes an appropriately sized coke 31; an induction coil 32 for generating heat from the outer periphery of the coke 31; a power supply for the induction coil 32 and a heating control device 30. ing.
  • C0 gas is generated from the coke 30 induced by the induction coil 32, and the atmosphere in the dross recovery device 19b becomes a reducing atmosphere.
  • the molten metal recovered is separated into dross in the molten metal and clean molten metal when passing between the coke 30 by being guided in the reducing atmosphere by the C ⁇ gas. Therefore, clean molten metal can be taken out, and clean molten metal can be returned to the molten metal circulation port 14.
  • a molten metal circulating device for sending molten metal from at least one of the tray 5 and the side molten metal tray 8 to the molten metal circulation port 14 and circulating the molten metal is provided. Constantly circulates.
  • iron dross and the like do not float and remain in the area where the steel strip is to be plated. Since the steel strip 1 is coated with clean molten metal at the area where the steel strip 1 is to be plated, a clean plating layer can be obtained.
  • FIG. 6 is a schematic diagram of a continuous molten metal plating apparatus used in this example.
  • This continuous molten metal plating apparatus is different from the first embodiment in that a support roll 4 for supporting a plating port 3 is provided in a plating apparatus main body.
  • the apparatus can be simplified and the equipment cost can be reduced.
  • the pair of support rolls 4 may support the pair of plating rolls 3, but in this embodiment, they are arranged slightly lower than the height of the pair of plating rolls 3.
  • the roll 3 for attaching the roll is arranged so as not to be immersed in the molten metal in the saucer 5, and the pair of support rolls 4 is arranged so that a part of the lower part thereof is immersed in the molten metal in the saucer 5. are doing. With this arrangement, the upper atmosphere and the lower atmosphere of the pair of support rolls 4 and the pair of plating rolls 3 can be shut off.
  • the saucer 5 is arranged with a slight gap so as not to contact the steel strip 1. In the width direction of the steel strip 1, from the steel strip 1 to the pair of support rolls 4 from the opposite side of the steel strip.
  • the saucer 5 is arranged so as to be large. Therefore, the molten metal flowing down from the surface of the pair of support ports 4 can be collected.
  • the pair of support rolls 4 may be provided with a rotation driving means 27 ', a gap adjusting means 23' movable in the width direction of the steel strip 1, and a heating means. good.
  • the surfaces of the pair of sabotro rolls 4 may be made of ceramics similarly to the pair of plating rolls 3, and the ceramics may be boride-based ceramics or carbide-based ceramics.
  • FIG. 6 is a schematic diagram showing a method for switching a dipping liquid using the continuous melting plating apparatus in the first and second embodiments.
  • the steel strip 1 After positioning the upper and lower side seals and the side molten metal pan according to the strip width of the steel strip 1, the steel strip 1 is passed through the plating rolls 3 and the valves 31b, 32a and 33b first. , 33b are closed, valves 31a and 33a are opened, and molten metal 24a previously melted with molten metal circulation port 14a is supplied by molten metal supply pump 15a. It is supplied to the space between the plating roll 3 and the steel strip 1 via the pipe 20, and the steel strip 1 is plated with a material of molten metal 24 a, and the molten metal pan 5 and the side molten metal pan 8 The recovered molten metal 24a is returned to the molten metal circulation port 14a via the recovery pipe 18.
  • the molten metal supply pump 15a is stopped, the valve 31a is closed, and the valve 32a is opened to melt the molten metal in the metal supply pipe 20.
  • the molten metal circulation port 14 and add the molten metal bath 16 and the molten metal pan ⁇ and the side molten metal pan 8
  • the molten metal 24a inside is returned to the molten metal circulation port 14a via the molten metal recovery pipe 18.
  • the molten metal 24a in the molten metal bath 16 or the piping may be extracted by a pump or the like (not shown) and returned to the molten metal circulation boat 14a.
  • valves 31a, 32a, 32b, 33a are closed, and valves 31b, 33b are opened.
  • the molten metal 24b melted in 4b is supplied, and the steel strip 1 is continuously coated with the molten metal 24b.
  • the molten metal plating liquids 24a and 24b may be, for example, a molten aluminum plating liquid and a molten zinc plating liquid.
  • two types of molten metal circulation systems are shown in the figure, a plurality of molten metal circulation systems may be added.
  • the molten metal bath formed by supplying the molten metal bath in the upper space between the pair of plating rolls and the steel strip facing each other via the steel strip.
  • the dross such as iron dross and oxide dross in the molten metal bath is reduced. It is possible to eliminate the residual, and by increasing the thickness of the flowing molten metal, it comes into contact with the outside air at the surface layer of the flow, and the oxide layer is formed only at the surface layer of the flow. In the vicinity of the roll surface, it is possible to transport only clean molten metal without an oxide layer, and it is possible to keep the plating surface of the steel strip clean.
  • the plating roll and the support roll have a surface layer made of a base metal material.
  • ceramics that are chemically bonded and have corrosion resistance to the molten metal By using ceramics that are chemically bonded and have corrosion resistance to the molten metal, the frequency of roll replacement can be reduced, productivity can be improved, and defects can be reduced.
  • a plurality of molten metal circulation systems are provided so that the plating solution can be easily switched, it is possible to change the type of plating in a short time, as in the case of conventional molten metal pot replacement. This eliminates the need to stop the line for a long time, thereby improving productivity and yield.
  • there is no need to immerse synchro and the like in the molten metal circulation port and since the steel strip does not pass through the inside, there is no generation of iron dross, etc. Becomes possible. Industrial applicability
  • the capacity of the molten metal is reduced by a compact facility, and the alloying time for contact between the molten metal and the steel strip is sufficiently ensured to secure the adhesion layer.
  • the effect is that the surface quality can be improved.
  • the capacity of the molten metal can be reduced with a compact facility, and the operation efficiency can be improved by extending the life of the roll.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)

Abstract

Une paire de cylindres disposés en opposition dans la direction perpendiculaire à la direction de déplacement d'une bande d'acier permettent de maintenir ladite bande d'acier. On effectue un apport continu de métal fondu dans les espaces existant entre les deux cylindres et la bande d'acier de manière à constituer un bain de métal fondu (réservoir) dans lesdits espaces. Les surfaces de la bande d'acier sont plaquées en continu lorsque la bande traverse le bain. Le métal fondu qui s'écoule à la surface du bain de métal fondu passe sur les parties supérieures des cylindres et est recueillie dans un plateau collecteur de métal fondu disposé entre les cylindres. Etant donné que les surfaces de la bande d'acier sont plaquées en continu avec le métal fondu du bain de métal fondu formé par l'apport de métal fondu dans les espaces supérieurs existant entre les cylindres de placage et la bande d'acier, il est possible de se passer d'un creuset de grande dimension pour le métal fondu tels que ceux nécessaires aux appareils d'immersion à chaud traditionnels.
PCT/JP1997/004486 1997-12-08 1997-12-08 Appareil d'immersion a chaud en continu et procede correspondant WO1999029918A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP1997/004486 WO1999029918A1 (fr) 1997-12-08 1997-12-08 Appareil d'immersion a chaud en continu et procede correspondant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1997/004486 WO1999029918A1 (fr) 1997-12-08 1997-12-08 Appareil d'immersion a chaud en continu et procede correspondant

Publications (1)

Publication Number Publication Date
WO1999029918A1 true WO1999029918A1 (fr) 1999-06-17

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PCT/JP1997/004486 WO1999029918A1 (fr) 1997-12-08 1997-12-08 Appareil d'immersion a chaud en continu et procede correspondant

Country Status (1)

Country Link
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01180954A (ja) * 1988-01-13 1989-07-18 Kobe Steel Ltd 溶融金属めっき装置
JPH04247857A (ja) * 1991-01-22 1992-09-03 Kobe Steel Ltd 連続溶融金属めっき方法及びその装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01180954A (ja) * 1988-01-13 1989-07-18 Kobe Steel Ltd 溶融金属めっき装置
JPH04247857A (ja) * 1991-01-22 1992-09-03 Kobe Steel Ltd 連続溶融金属めっき方法及びその装置

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