EP0708843B1 - Method and plant for the manufacture of special steel blanks - Google Patents
Method and plant for the manufacture of special steel blanks Download PDFInfo
- Publication number
- EP0708843B1 EP0708843B1 EP94924719A EP94924719A EP0708843B1 EP 0708843 B1 EP0708843 B1 EP 0708843B1 EP 94924719 A EP94924719 A EP 94924719A EP 94924719 A EP94924719 A EP 94924719A EP 0708843 B1 EP0708843 B1 EP 0708843B1
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- EP
- European Patent Office
- Prior art keywords
- plant
- scaling
- strip
- annealing
- pickling
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 title abstract description 7
- 239000010959 steel Substances 0.000 title abstract description 7
- 238000000137 annealing Methods 0.000 claims abstract description 53
- 239000000463 material Substances 0.000 claims abstract description 49
- 238000005554 pickling Methods 0.000 claims abstract description 36
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 238000005266 casting Methods 0.000 claims abstract description 13
- 238000012432 intermediate storage Methods 0.000 claims abstract description 10
- 239000010935 stainless steel Substances 0.000 claims description 46
- 229910001220 stainless steel Inorganic materials 0.000 claims description 46
- 239000000126 substance Substances 0.000 claims description 15
- 238000005098 hot rolling Methods 0.000 claims description 13
- 239000002253 acid Substances 0.000 claims description 10
- 150000007513 acids Chemical class 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 3
- 238000009499 grossing Methods 0.000 claims description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 150000002739 metals Chemical class 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229910017604 nitric acid Inorganic materials 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 230000001680 brushing effect Effects 0.000 claims 3
- 239000012736 aqueous medium Substances 0.000 claims 1
- 238000001311 chemical methods and process Methods 0.000 claims 1
- 230000001939 inductive effect Effects 0.000 claims 1
- 239000001117 sulphuric acid Substances 0.000 claims 1
- 235000011149 sulphuric acid Nutrition 0.000 claims 1
- 238000004804 winding Methods 0.000 abstract description 12
- 238000005096 rolling process Methods 0.000 abstract description 3
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- 101150006573 PAN1 gene Proteins 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- 239000010965 430 stainless steel Substances 0.000 description 1
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/466—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/228—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length skin pass rolling or temper rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/06—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing of strip material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
Definitions
- the invention relates to a method for producing stainless steel strip or plates, wherein the cast material is annealed and cooled in batches, or a method comprising batch-wise casting and cooling.
- the stainless steel is melted with all alloying elements, the melt is poured into a slab and this is mechanically cleaned of contaminants on the surface after cooling. Then the cleaned slab is heated again and in a hot rolling mill into a strip - typically with a maximum thickness of 15 mm, a maximum width of 2.5 m and a length of the order of up to 100 m and more - or a plate - typically with a thickness between 10 and 150 mm and dimensions of about 10 m length and 3 m width - rolled out.
- the stainless steel strip can be treated in batches in a suitable pickling line, as described for example in AT-PS 394.734, without further annealing. Different steel grades and strips or plates of different dimensions can be treated directly in succession without the need for time-consuming changes to the treatment system.
- the stainless steel hot strip is annealed in continuously working annealing and pickling lines in a gas-heated annealing furnace, then cooled, the majority of the scale is removed mechanically and the remaining scale is removed by pickling with preferably acids, with a pretreatment with electricity to save acids in Neutral salt solutions can be applied.
- stainless steel strips are welded into an endless strip, which is cut again at the end of the system. Sheets or other shaped blanks are transported through the system in various ways.
- this also has the disadvantage that, for example, the strip has to be removed from a strip store during the welding time, which is then filled again.
- all strip that is currently in the annealing furnace is scrap, as it has been subjected to the annealing treatment for too long.
- the invention is intended to avoid the disadvantages mentioned above and to provide a method or a system in which there is greater flexibility in the sequence of stainless steel qualities and dimensions of the stainless steel strips or plates in the entire manufacturing process for stainless steel blanks.
- this is achieved according to the invention by the batch-wise annealing of the material and the descaling which follows the last heat treatment of the material without intermediate storage, the material being pushed both through an annealing furnace and through the descaling system, preferably a pickling system. until the beginning of the material has emerged from the descaling system, after which the material is drawn exclusively or additionally from devices located after the descaling system through the annealing furnace and the descaling system becomes.
- the process variant of the production of stainless steel strips or plates, which are cast, is characterized according to the invention by the batch-wise casting and the subsequent descaling without intermediate storage, the material being pushed both through an annealing furnace and through the descaling system, preferably a pickling system, until the beginning of the material has emerged from the descaling system, after which the material is drawn exclusively or additionally by devices located after the descaling system through the annealing furnace and the descaling system.
- the advantages correspond to the first-mentioned method in terms of flexibility in the immediately successive producibility of different stainless steel qualities and blanks of different dimensions.
- an improved quality of the stainless steel can be achieved with many materials while maintaining the advantages mentioned above.
- the production of, for example, stainless steel strip it can be hot-rolled and cast after casting then annealed, cooled and descaled.
- the strip can be freed from the scale formed in a descaling system consisting of mechanical pre-descaling followed by chemical descaling (pickling) be, the tape does not have to be wound up into a bundle beforehand, but all steps are carried out continuously in one pass. Only before the strip is wound up into a bundle or, if necessary, passed directly through the annealing and descaling system, is the beginning of the strip, which in the case of casting is not the same width as the rest of the subsequent strip, cut off with scissors and returned as scrap . The end of the tape, which also does not have the full bandwidth, is also cut off and returned.
- band-shaped material is fed to a winding device, preferably a reel, and wound thereon, the material preferably being pulled through the system by the winding device.
- a winding device preferably a reel
- the material is cut into plates after leaving the descaling system.
- the requirements of the customers regarding the dimensions or the surface quality of the stainless steel can be met in a favorable manner if the strip-shaped material is smoothed, if necessary before winding, for example in a skin-pass system.
- descaling is carried out chemically, optionally after mechanical descaling, preferably by means of acids, for example nitric acid, sulfuric acid, hydrochloric acid, hydrofluoric acid or a mixture of at least two of these acids and / or aqueous solutions of one or more salts of these acids with the metals contained in the material.
- acids for example nitric acid, sulfuric acid, hydrochloric acid, hydrofluoric acid or a mixture of at least two of these acids and / or aqueous solutions of one or more salts of these acids with the metals contained in the material.
- the chemical descaling described above is advantageously facilitated by electrolytic treatment of the material, in particular in a neutral salt solution, prior to chemical descaling, the material preferably being poled alternately anodically or cathodically.
- the upstream electrolytic treatment loosens the scale layer and thereby facilitates chemical attack by the pickling liquid.
- the material is inductively heated in the annealing furnace. This means that the warm-up times of the material can be around 10 to 20% of the time in conventional annealing furnaces with gas burners and, consequently, the throughput times reduced by the annealing system and the throughput rate can be increased through the entire system.
- a plant according to the invention for producing stainless steel blanks comprises a casting plant for the raw material and a descaling plant, preferably a pickling plant, and is characterized according to the invention by cooling devices for the cast material and devices for pushing the beginning of the material through the immediately following descaling plant.
- a rolling mill preferably a hot rolling mill
- a descaling plant preferably a pickling plant
- the descaling plant is connected to an annealing device for the rolled material, preferably a Annealing furnace, if necessary a cooling device after the annealing device, without intermediate storage, for example winding and unwinding devices, immediately following.
- An advantageous embodiment of the system according to the invention is characterized in that the glow device is designed as an inductively acting glow device. Due to the shorter heating-up times, significantly smaller annealing furnaces can be used with the same throughput, which leads to large savings in investment costs, or, with the same design of the furnace, to higher throughput of the furnace and also the entire system. In addition, the direct heating and the associated reduction in heat losses also reduce operating costs.
- the annealing device and the descaling system are equipped with means for pushing the beginning of the material through the device or system, i.e. designed as a thrust annealing device or thrust pickling system.
- a thrust annealing device or thrust pickling system i.e. designed as a thrust annealing device or thrust pickling system.
- devices for gripping the beginning of the material emerging from the descaling system are advantageously provided after the descaling system, preferably driven winding devices such as a reel.
- a cross-cut shear could be provided according to a variant after the descaling system.
- a device for smoothing the material preferably a strip smoothing device, such as, for example, is between the descaling system and the winding device or cross-cutting shear a skin pass system is provided.
- the descaling system has at least one chemical descaling section, in particular a pickling section with at least one container for holding aqueous pickling media, preferably acids.
- electrodes of different polarity are present in at least one container according to a further feature of the invention.
- At least one washing brush machine preferably with abrasive brushes, can be provided between at least two containers.
- a rinsing section is provided, which is preferably equipped with a washing brush machine, preferably with abrasive brushes.
- FIG. 1 shows a flow diagram of a conventional method for producing stainless steel strip
- FIGS. 2, 3 and 4 show flow diagrams of three method variants according to the invention
- FIG. 5 schematically represents a conventional system for producing stainless steel strip
- FIG. 6 , 7 and 8 represent, likewise schematically, advantageous exemplary embodiments for plants for carrying out the method according to the invention.
- Fig. 1 shows the sequence of a conventional method for producing a stainless steel strip with the successive steps of melting the stainless steel, pouring the slab, cooling the cast slab and cleaning it from the adhering scale, heating again, hot rolling to the desired final thickness Tape, cooling and winding into a bundle. Subsequently, however, after a storage period that is in principle arbitrary, can the bundle is annealed again in a conventional continuous annealing and pickling system before being fed in for further processing and then descaled mechanically and / or chemically, after which the finished strip is either wound up again into a bundle or cut into plates.
- the melting of the stainless steel is followed by casting of the blank and hot rolling to the desired strip thickness. This is followed by cooling and winding the tape into a bundle.
- This bundle is, if necessary, discontinuously annealed and descaled after a certain storage period, that is to say without being connected to another bundle, for example by welding, after which the finished strip is rewound - or also cut into plates.
- the strip is immediately cast in the desired thickness, as is the case according to a second variant of the method shown in FIG. 3, the strip, which is already of the final thickness, is cooled immediately by the discontinuous annealing and descaling of the strip. Finally, it can be rewound or cut into plates.
- the process sequence shown schematically in FIG. 4 complements the previously described sequence to the extent that, if necessary, the strip can be annealed after it has been hot-rolled and then cooled. Only after the repeated cooling, there is then an intermittent annealing and immediately followed by the descaling of the strip and its winding or cutting.
- FIG. 5 schematically shows a plant for the production of stainless steel strip according to the conventional method.
- Stainless steel melted and poured in the continuous casting plant 2.
- Pieces of a predetermined length are separated from a separating device 3, which are then fed to an annealing furnace 4, then rolled in a hot rolling mill 5 to the desired final thickness of the strip, cooled in a cooling system 6, for example by spraying with water or air cooling, and finally preferably on a coiler 7 be wound up in bundles.
- Such bundles of stainless steel strips are further fed to a continuous annealing and pickling system.
- continuous means that the strips delivered one behind the other are unwound from a decoiler 8, connected to one another in a welding installation 10 and drawn through the subsequent installations as a "continuous strip".
- the strip In order not to hinder the continuous passage of the preceding strip section during the welding of two strips, the strip must be removed from a strip store 11 for this period of time.
- the repeated annealing in the annealing system 12 can often be omitted, but the mechanical pre-descaling in the descaling system 13, for example a "shot blaster", and the chemical descaling in a pickling section 14, if necessary with current support, are absolutely necessary for the required surface quality of the strip are.
- the belt After a rinsing system 15 for removing pickling liquid still on the belt, the belt again arrives in a memory 16 so as not to impede the separation of the individual belt sections by the cross-cutting system 17, and is finally wound up again into a bundle on a reel 18.
- the embodiment of the plant according to the invention shown in Fig. 6 also includes the pan 1 and the continuous casting plant 2, from which the cast blank is fed directly to the hot rolling mill 5 and after subsequent cooling in the cooling system 6 is wound on a reel 7.
- Each coil is unwound from the uncoiler 8 and fed directly to an annealing furnace 12 without being connected to a preceding or subsequent coil.
- the beginning of each strip is pushed through the annealing furnace 12, the mechanical descaling system 13, the chemical descaling system 14 and the rinsing system 15, until it reaches the reel 18.
- the beginning of the tape is preferably clamped and can then transport the tape exclusively or together with the devices for pushing the beginning of the tape through the systems 12, 13, 14 and 15, the tape being wound up again.
- a washing brush machine 14a can advantageously be provided between each two pickling tubs of the pickling system 14, and instead of the reel 18 a cross-cutting system could be provided for dividing the finished strip into plates.
- a further advantageous embodiment for a system according to the invention provides, as shown in FIG. 7, to cast a strip with the desired final thickness directly in a strip casting system 2a and to cool it in a cooling system 6.
- This strip is then fed directly to the annealing furnace 12, pushed through it and, after renewed cooling in a further cooling system 6, is fed to the mechanical descaling system 13 and the chemical descaling system 14, through which the strip is also pushed until it passes the reel after passing through the rinsing system 15 18 or has reached a cross-cutting system.
- the strip is first hot-rolled to the desired thickness after the strip casting system 2a and then goes through the process steps and systems described in the previous paragraph, with the exception that the descaling is directly followed by the annealing.
- a stainless steel strip of quality AISI 304 with a dimension of 350 mm width and 10 mm thickness was continuously cast on a test plant, cooled to a strip temperature of 60 ° C. and then freed from the scale formed in a chemical pickling plant.
- the first part of the tape was cut with a pair of cross-cut scissors into 1.5 m long plates, the rest was wound up on a reel.
- the technological properties of the stainless steel belt corresponded to the properties of a conventionally manufactured belt.
- a stainless steel strip of AISI 304 quality in the dimensions 350 mm wide and 13 mm thick was continuously cast, cooled somewhat and rolled directly to a final thickness of 5 mm in a hot rolling mill. After the rolled strip had cooled to 45 ° C., the stainless steel strip was pushed directly through a mechanical and chemical descaling system, pickled, rinsed and dried. It was only after drying that the tape was wound up for the first time.
- the technological properties of the stainless steel belt corresponded to the properties of a conventionally manufactured belt.
- a stainless steel band of AISI 316 quality in dimensions of 320 mm wide and 8 mm thick was cast, cooled to room temperature and wound up into a bundle. After a storage period of a few days, this strip was heated in a separate, continuously working annealing and pickling line with an inductively heated oven to 1100 ° C - 1300 ° C, then cooled to approx. 50 ° C with air and water, descaled mechanically and chemically and rewound after rinsing and drying.
- a stainless steel strip of the quality AISI 430 in the dimensions 350 mm wide and 15 mm thick was cast, then rolled in a hot rolling mill to 7 mm strip thickness and then cooled to room temperature and wound up. After a storage period of several days, this stainless steel strip was annealed again in a separate, continuously working annealing and pickling line, mechanically and chemically descaled and rewound after rinsing with water and drying.
- a conventionally produced stainless steel strip of quality AISI 304 was cut after hot rolling from a total width of 1450 mm into a strip with a width of 300 mm and a further strip of 1150 mm.
- the wider strip was conventionally annealed in a continuously working annealing and pickling plant, mechanically and chemically descaled and rewound.
- the narrow strip was annealed in a discontinuous thrust annealing and thrust pickling system with an inductively heated furnace, then also mechanically and chemically descaled and wound up. When the technological properties were compared, no difference could be found between the two tapes treated differently.
- a conventionally produced stainless steel strip of the quality AISI 316 was divided after the hot rolling from a total width of 1350 mm into a strip with a width of 350 mm and a strip with a width of 1000 mm. While the wider strip was conventionally annealed, mechanically and chemically descaled and rewound in a continuously working annealing and pickling system, the narrower strip went through a discontinuous thrust annealing and thrust pickling system. After the annealing in the induction heated annealing furnace, the subsequent mechanical and chemical descaling and winding, again no difference could be found in the technological properties of the two strips.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Metal Rolling (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Herstellung von Edelstahlband oder -platten, wobei das gegossene Material chargenweise geglüht und abgekühlt wird, bzw. ein Verfahren umfassend das chargenweise Gießen und Abkühlen.The invention relates to a method for producing stainless steel strip or plates, wherein the cast material is annealed and cooled in batches, or a method comprising batch-wise casting and cooling.
Bei den bekannten Verfahren zur Herstellung von Edelstahl, insbesondere von Edelstahlband oder -platten, wird der Edelstahl mit allen Legierungselementen erschmolzen, die Schmelze zu einer Bramme gegossen und diese nach dem Erkalten mechanisch von Verunreinigungen an der Oberfläche gereinigt. Danach wird die gereinigte Bramme erneut erwärmt und in einem Warmwalzwerk zu einem Band - typischerweise mit einer Dicke von maximal 15 mm, einer Breite von maximal 2,5 m und einer Länge in der Größenordnung von bis zu 100 m und mehr - oder einer Platte - typischerweise mit einer Dicke zwischen 10 und 150 mm sowie Abmessungen von etwa 10 m Länge und 3 m Breite - ausgewalzt. Wenn das Warmwalzwerk aus einer Steckel Mill besteht, kann das Edelstahlband ohne weitere Glühbehandlung chargenweise in einer geeigneten Beizlinie, wie sie beispielsweise in der AT-PS 394.734 beschrieben ist, behandelt werden. Dabei können unterschiedliche Stahlqualitäten und Bänder bzw. Platten unterschiedlicher Dimensionen unmittelbar aufeinanderfolgend behandelt werden, ohne daß aufwendige Umstellungen der Behandlungsanlage notwendig sind.In the known processes for the production of stainless steel, in particular stainless steel strip or plates, the stainless steel is melted with all alloying elements, the melt is poured into a slab and this is mechanically cleaned of contaminants on the surface after cooling. Then the cleaned slab is heated again and in a hot rolling mill into a strip - typically with a maximum thickness of 15 mm, a maximum width of 2.5 m and a length of the order of up to 100 m and more - or a plate - typically with a thickness between 10 and 150 mm and dimensions of about 10 m length and 3 m width - rolled out. If the hot rolling mill consists of a Steckel Mill, the stainless steel strip can be treated in batches in a suitable pickling line, as described for example in AT-PS 394.734, without further annealing. Different steel grades and strips or plates of different dimensions can be treated directly in succession without the need for time-consuming changes to the treatment system.
Andernfalls wird das Edelstahl-Warmband in kontinuierlich arbeitenden Glüh- und Beizlinien in einem mit Gas beheizten Glühofen geglüht, anschließend abgekühlt, der Großteil des Zunders mechanisch entfernt und der restliche Zunder durch Beizen mit vorzugsweise Säuren entfernt, wobei zum Einsparen von Säuren eine Vorbehandlung mit Strom in Neutralsalzlösungen angewendet werden kann. Bei dieser Art der Anlage werden Edelstahlbänder zu einem Endlosband verschweißt, das am Ende der Anlage wieder aufgetrennt wird. Platten oder anders geformte Rohlinge werden auf verschiedene Art durch die Anlage transportiert. Dies hat neben den hohen Investitionskosten für die Schweißmaschine, die Transporteinrichtungen und die damit in Verbindung stehenden Apparaturen auch noch den Nachteil, daß etwa das Band während der Schweißzeit aus einem Bandspeicher entnommen werden muß, der anschließend wieder gefüllt wird. Weiters ist bei Störungen an der Schweißmaschine oder im Bandspeicher alles Band, das sich gerade im Glühofen befindet, Schrott, da es zu lange Zeit der Glühbehandlung ausgesetzt wurde.Otherwise, the stainless steel hot strip is annealed in continuously working annealing and pickling lines in a gas-heated annealing furnace, then cooled, the majority of the scale is removed mechanically and the remaining scale is removed by pickling with preferably acids, with a pretreatment with electricity to save acids in Neutral salt solutions can be applied. With this type of system, stainless steel strips are welded into an endless strip, which is cut again at the end of the system. Sheets or other shaped blanks are transported through the system in various ways. In addition to the high investment costs for the welding machine, the transport devices and the associated apparatus, this also has the disadvantage that, for example, the strip has to be removed from a strip store during the welding time, which is then filled again. Furthermore, in the event of malfunctions in the welding machine or in the strip store, all strip that is currently in the annealing furnace is scrap, as it has been subjected to the annealing treatment for too long.
In letzter Zeit werden vermehrt Edelstahlrohlinge in Form von Platten und Bändern gegossen und nach dem Abkühlen entzundert und vorzugsweise gebeizt. Diese Platten müssen zwar nicht unbedingt in allen Fällen geglüht werden, dies kann jedoch vorgesehen sein. Dabei ist es zum Entzundern und Beizen, allenfalls auch zum Glühen vor diesen Behandlungsschritten, notwendig, die Platten durch die oder jede nachfolgende Behandlungsanlage zu transportieren.Recently, stainless steel blanks have increasingly been cast in the form of plates and strips and, after cooling, descaled and preferably pickled. These plates do not necessarily have to be annealed in all cases, but this can be provided. For descaling and pickling, if necessary also for annealing before these treatment steps, it is necessary to transport the plates through the or each subsequent treatment plant.
Die Erfindung soll die oben genannten Nachteile vermeiden und ein Verfahren bzw. eine Anlage angeben, bei welchen im gesamten Herstellungsverfahren für Edelstahlrohlinge eine größere Flexibilität in der Abfolge von Edelstahlqualitäten und Abmessungen der Edelstahlbänder oder -platten gegeben ist.The invention is intended to avoid the disadvantages mentioned above and to provide a method or a system in which there is greater flexibility in the sequence of stainless steel qualities and dimensions of the stainless steel strips or plates in the entire manufacturing process for stainless steel blanks.
Dies wird bei der Variante mit gewalzten Rohlingen erfindungsgemäß durch das chargenweise Glühen des Materials, und das ohne Zwischenlagerung an die letzte Wärmebehandlung des Materials anschließende Entzundern erzielt, wobei das Material sowohl durch einen Glühofen als auch durch die Entzunderungsanlage, vorzugsweise eine Beizanlage, geschoben wird, bis der Anfang des Materials aus der Entzunderungsanlage ausgetreten ist, wonach das Material ausschließlich oder zusätzlich von nach der Entzunderungsanlage befindlichen Einrichtungen durch den Glühofen und die Entzunderungsanlage gezogen wird. Damit wird der Aufwand- auch bezüglich der apparativen Seite - für das Einziehen und Durchziehen des Materials vermieden und die Herstellung und Behandlung von Chargen von Edelstahlbändern und/oder -platten unterschiedlicher Qualität und Abmessungen ist damit wesentlich vereinfacht, und durch das chargenweise Glühen und Entzundern ohne Zwischenlagerung ist ein Zusammenschweißen und späteres Trennen der Edelstahlbänder und gegebenenfalls daraus hergestellter Platten nicht notwendig und das gesamte Herstellungsverfahren somit wesentlich vereinfacht und auch viel flexibler als die herkömmlichen Verfahren. Die zur Durchführung des Verfahrens vorgesehene Anlage kann ohne Schweiß- und Trennmaschinen und ohne Bandspeicher ausgeführt und damit bei größerer Flexibilität in der Anwendung kleiner, einfacher und billiger gehalten werden.In the variant with rolled blanks, this is achieved according to the invention by the batch-wise annealing of the material and the descaling which follows the last heat treatment of the material without intermediate storage, the material being pushed both through an annealing furnace and through the descaling system, preferably a pickling system. until the beginning of the material has emerged from the descaling system, after which the material is drawn exclusively or additionally from devices located after the descaling system through the annealing furnace and the descaling system becomes. This avoids the effort - also with regard to the apparatus - for pulling in and pulling through the material and the production and treatment of batches of stainless steel strips and / or plates of different quality and dimensions is thus considerably simplified and without batches of annealing and descaling Intermediate storage means that welding and later separation of the stainless steel strips and any plates made from them is not necessary, and the entire manufacturing process is thus considerably simplified and also much more flexible than the conventional methods. The system provided for carrying out the method can be carried out without welding and cutting machines and without a belt store and can thus be kept smaller, simpler and cheaper with greater flexibility in use.
Die Verfahrensvariante der Herstellung von Edelstahlbändern oder - platten, die gegossen werden, ist erfindungsgemäß gekennzeichnet durch das chargenweise Gießen und das ohne Zwischenlagerung daran anschließende Entzundern, wobei das Material sowohl durch einen Glühofen als auch durch die Entzunderungsanlage, vorzugsweise eine Beizanlage, geschoben wird, bis der Anfang des Materials aus der Entzunderungsanlage ausgetreten ist, wonach das Material ausschließlich oder zusätzlich von nach der Entzunderungsanlage befindlichen Einrichtungen durch den Glühofen und die Entzunderungsanlage gezogen wird. Die Vorteile entsprechen dabei bezüglich der Flexibilität in der unmittelbar aufeinanderfolgenden Herstellbarkeit von verschiedenen Edelstahlqualitäten und Rohlingen verschiedener Abmessungen dem zuerst genannten Verfahren.The process variant of the production of stainless steel strips or plates, which are cast, is characterized according to the invention by the batch-wise casting and the subsequent descaling without intermediate storage, the material being pushed both through an annealing furnace and through the descaling system, preferably a pickling system, until the beginning of the material has emerged from the descaling system, after which the material is drawn exclusively or additionally by devices located after the descaling system through the annealing furnace and the descaling system. The advantages correspond to the first-mentioned method in terms of flexibility in the immediately successive producibility of different stainless steel qualities and blanks of different dimensions.
Wenn gemäß einem weiteren Merkmal der Erfindung das Material nach dem Gießen vorerst warmgewalzt, anschließend geglüht, abgekühlt und ohne Zwischenlagerung des geglühten Materials nach der letzten Wärmebehandlung entzundert wird, kann bei vielen Materialien unter Beibehaltung der oben angeführten Vorteile eine verbesserte Qualität des Edelstahls erzielt werden. Bei der Herstellung von beispielsweise Edelstahlband kann dieses nach dem Gießen warmgewalzt und anschließend direkt geglüht, abgekühlt und entzundert werden. Wird das Edelstahlband bereits aus der Schmelze zu einem Band gegossen und gegebenenfalls in einem Warmwalzwerk auf die gewünschte Dicke gewalzt, kann das Band nach dem Abkühlen direkt in einer Entzunderungsanlage, bestehend aus einer mechanischen Vorentzunderung mit einer anschließenden chemischen Entzunderung (Beize) vom gebildeten Zunder befreit werden, wobei das Band vorher nicht zu einem Bund aufgewickelt werden muß, sondern alle Schritte kontinuierlich in einem Durchgang erfolgen. Erst bevor das Band zu einem Bund aufgewickelt wird oder gegebenenfalls direkt durch die Glüh- und Entzunderungsanlage geführt wird, wird der Bandanfang, der im Falle des Gießens nicht die gleiche Breite wie das restliche, nachfolgende Band hat, mit einer Schere abgetrennt und als Schrott zurückgeführt. Ebenso wird auch das Ende des Bandes, das auch nicht die volle Bandbreite hat, abgetrennt und zurückgeführt.According to a further feature of the invention, if the material is first hot-rolled after casting, then annealed, cooled and descaled without intermediate storage of the annealed material after the last heat treatment, an improved quality of the stainless steel can be achieved with many materials while maintaining the advantages mentioned above. In the production of, for example, stainless steel strip, it can be hot-rolled and cast after casting then annealed, cooled and descaled. If the stainless steel strip is already cast from the melt into a strip and, if necessary, rolled to the desired thickness in a hot rolling mill, the strip can be freed from the scale formed in a descaling system consisting of mechanical pre-descaling followed by chemical descaling (pickling) be, the tape does not have to be wound up into a bundle beforehand, but all steps are carried out continuously in one pass. Only before the strip is wound up into a bundle or, if necessary, passed directly through the annealing and descaling system, is the beginning of the strip, which in the case of casting is not the same width as the rest of the subsequent strip, cut off with scissors and returned as scrap . The end of the tape, which also does not have the full bandwidth, is also cut off and returned.
Vorzugsweise wird dabei bandförmiges Material einer Aufwickelvorrichtung, vorzugsweise einer Aufhaspel, zugeführt und darauf aufgewickelt, wobei vorzugsweise das Material von der Aufwickelvorrichtung durch die Anlage gezogen wird.Preferably, band-shaped material is fed to a winding device, preferably a reel, and wound thereon, the material preferably being pulled through the system by the winding device.
Gemäß einer Variante der Erfindung wird das Material nach Verlassen der Entzunderungsanlage in Platten geschnitten.According to a variant of the invention, the material is cut into plates after leaving the descaling system.
In günstiger Weise können die Anforderungen der Kunden an die Abmessungen bzw. die Oberflächenqualität des Edelstahls erfüllt werden, wenn bandförmiges Material, gegebenenfalls vor dem Aufwickeln, geglättet wird, beispielsweise in einer Skin-pass-Anlage.The requirements of the customers regarding the dimensions or the surface quality of the stainless steel can be met in a favorable manner if the strip-shaped material is smoothed, if necessary before winding, for example in a skin-pass system.
Gemäß einer vorteilhaften Weiterbildung des erfindungsgemäßen Verfahrens erfolgt die Entzunderung chemisch, gegebenenfalls anschließend an eine mechanische Entzunderung, vorzugsweise durch Säuren, beispielsweise Salpetersäure, Schwefelsäure, Salzsäure, Flußsäure oder einer Mischung von zumindest zwei dieser Säuren und/oder wässrigen Lösungen eines oder mehrerer Salze dieser Säuren mit den im Material enthaltenen Metallen. Dies erlaubt die Entzunderung im bewährten Verfahren, wobei besonders gute Oberflächenqualitäten erzielbar sind.According to an advantageous development of the method according to the invention, descaling is carried out chemically, optionally after mechanical descaling, preferably by means of acids, for example nitric acid, sulfuric acid, hydrochloric acid, hydrofluoric acid or a mixture of at least two of these acids and / or aqueous solutions of one or more salts of these acids with the metals contained in the material. This allows descaling in the proven process, whereby particularly good surface qualities can be achieved.
Eine Erleichterung des zuvor beschriebenen chemischen Entzunderns wird vorteilhafterweise dadurch erzielt, daß vor der chemischen Entzunderung eine elektrolytische Behandlung des Materials, insbesondere in einer Neutralsalzlösung, erfolgt, wobei das Material vorzugsweise abwechselnd anodisch oder kathodisch gepolt wird. Die vorgeschaltete elektrolytische Behandlung führt zu einem Lockern der Zunderschicht und erleichtert dadurch den chemischen Angriff durch die Beizflüssigkeit.The chemical descaling described above is advantageously facilitated by electrolytic treatment of the material, in particular in a neutral salt solution, prior to chemical descaling, the material preferably being poled alternately anodically or cathodically. The upstream electrolytic treatment loosens the scale layer and thereby facilitates chemical attack by the pickling liquid.
Um den Ansprüchen an die Geschwindigkeit beim Durchführen des Materials durch die Entzunderungsanlage besser entsprechen zu können, ist gemäß einem weiteren Merkmal der Erfindung vorgesehen, daß das Material im Glühofen induktiv erwärmt wird. Damit können die Aufwärmzeiten des Materials auf ca 10 bis 20% der Zeit in herkömmlichen Glühöfen mit Gasbrennern und daraus folgend auch die Durchlaufzeiten durch die Glühanlage reduziert sowie die Durchsatzrate durch die gesamte Anlage erhöht werden.In order to better meet the demands on the speed when the material is passed through the descaling system, it is provided according to a further feature of the invention that the material is inductively heated in the annealing furnace. This means that the warm-up times of the material can be around 10 to 20% of the time in conventional annealing furnaces with gas burners and, consequently, the throughput times reduced by the annealing system and the throughput rate can be increased through the entire system.
Eine erfindungsgemäße Anlage zum Herstellen von Edelstahlrohlingen, insbesondere von Edelstahlband, umfaßt gemäß einer ersten Variante eine Gießanlage für das Rohmaterial und eine Entzunderungsanlage, vorzugsweise eine Beizanlage, und ist erfindungsgemäß gekennzeichnet durch Kühleinrichtungen für das gegossene Material, sowie Einrichtungen zum Durchschieben des Anfanges des Materials durch die unmittelbar anschließende Entzunderungsanlage. Damit sind keinerlei Anlagen zum Verbinden der aufeinanderfolgenden Chargen, keinerlei Bandspeicher und auch keine Trennanlage nach der Entzunderungsanlage notwendig, sodaß die Investitionskosten für die geringeren Platzbedarf aufweisende Anlage drastisch reduziert werden können. Auch die Ausschußmenge bei Störungen an der Schweißmaschine bzw. dem Bandspeicher werden vermieden, da diese kostspieligen und anfälligen Anlagenteile nicht benötigt werden.According to a first variant, a plant according to the invention for producing stainless steel blanks, in particular stainless steel strip, comprises a casting plant for the raw material and a descaling plant, preferably a pickling plant, and is characterized according to the invention by cooling devices for the cast material and devices for pushing the beginning of the material through the immediately following descaling plant. This means that no systems for connecting the successive batches, no tape storage and also no separation system after the descaling system are necessary, so that the investment costs for the system which requires less space can be drastically reduced. The amount of rejects in the event of malfunctions in the welding machine or the belt store are also avoided, since these expensive and fragile system parts are not required.
Die oben angeführten Vorteile treten auch bei der Variante der erfindungsgemäßen Anlage auf, umfassend ein Walzwerk, vorzugsweise ein Warmwalzwerk, und eine Entzunderungsanlage, vorzugsweise eine Beizanlage, welche Anlage dadurch gekennzeichnet ist, daß sich die Entzunderungsanlage an eine Glühvorrichtung für das gewalzte Material, vorzugsweise einen Glühofen, allenfalls eine Kühleinrichtung nach der Glühvorrichtung, ohne Zwischenlager, beispielsweise Auf- und Abwickelvorrichtungen, unmittelbar darauffolgend anschließt.The above-mentioned advantages also occur in the variant of the plant according to the invention, comprising a rolling mill, preferably a hot rolling mill, and a descaling plant, preferably a pickling plant, which plant is characterized in that the descaling plant is connected to an annealing device for the rolled material, preferably a Annealing furnace, if necessary a cooling device after the annealing device, without intermediate storage, for example winding and unwinding devices, immediately following.
Eine vorteilhafte Ausgestaltung der erfindungsgemäßen Anlage ist dadurch gekennzeichnet, daß die Glühvorrichtung als induktiv wirkende Glühvorrichtung ausgebildet ist. Durch die kürzeren Aufheizzeiten können bei gleicher Durchsatzleistung erheblich kleinere Glühöfen eingesetzt werden, was zu großen Einsparungen bei den Investitionskosten führt, oder bei gleicher Auslegung des Ofens zu höherem Durchsatz des Ofens und auch der gesamten Anlage führt. Darüberhinaus werden durch die direktere Beheizung und die damit verbundene Verminderung der Wärmeverluste auch die Betriebskosten gesenkt.An advantageous embodiment of the system according to the invention is characterized in that the glow device is designed as an inductively acting glow device. Due to the shorter heating-up times, significantly smaller annealing furnaces can be used with the same throughput, which leads to large savings in investment costs, or, with the same design of the furnace, to higher throughput of the furnace and also the entire system. In addition, the direct heating and the associated reduction in heat losses also reduce operating costs.
Vorzugsweise sind die Glühvorrichtung sowie die Entzunderungsanlage mit Einrichtungen zum Durchschieben des Anfanges des Materials durch die Vorrichtung bzw. die Anlage ausgestattet, d.h. als Schubglühvorrichtung bzw. Schubbeizanlage ausgebildet. Durch diese Ausgestaltung können in günstiger Weise ohne große Ausschüsse Edelstahlrohlinge, insbesondere Bänder und daraus später hergestellte Platten, unterschiedlichster Qualitäten und Abmessungen hergestellt werden.Preferably, the annealing device and the descaling system are equipped with means for pushing the beginning of the material through the device or system, i.e. designed as a thrust annealing device or thrust pickling system. With this configuration, stainless steel blanks, in particular strips and plates made therefrom, of various qualities and dimensions can be produced in a favorable manner without large rejects.
Dabei sind vorteilhafterweise nach der Entzunderungsanlage Einrichtungen zum Ergreifen des Anfanges des aus der Entzunderungsanlage austretenden Materials vorgesehen, vorzugsweise angetriebene Aufwickelvorrichtungen wie etwa eine Aufhaspel.In this case, devices for gripping the beginning of the material emerging from the descaling system are advantageously provided after the descaling system, preferably driven winding devices such as a reel.
Gleichermaßen könnte gemäß einer Variante nach der Entzunderungsanlage eine Querteilschere vorgesehen sein.Similarly, a cross-cut shear could be provided according to a variant after the descaling system.
Um den Forderungen an die Abmessungen und die Oberflächenqualität des Bandes bzw. der Platten optimal Rechnung tragen zu können, ist gemäß einem weiteren Merkmal der Erfindung zwischen der Entzunderungsanlage und der Aufwickelvorrichtung bzw. Querteilschere eine Einrichtung zum Glätten des Materials, vorzugsweise eine Bandglätteinrichtung, wie beispielsweise eine Skin-pass-Anlage, vorgesehen.In order to be able to optimally take into account the requirements for the dimensions and the surface quality of the strip or the plates, according to a further feature of the invention, a device for smoothing the material, preferably a strip smoothing device, such as, for example, is between the descaling system and the winding device or cross-cutting shear a skin pass system is provided.
Vorzugsweise, um beste Oberflächenqualität des Edelstahles unter Verwendung bewährter Technologie zu erzielen, ist vorgesehen, daß die Entzunderungsanlage zumindest eine chemische Entzunderungssektion, insbesondere eine Beizsektion mit zumindest einem Behälter zur Aufnahme von wässrigen Beizmedien, vorzugsweise Säuren, aufweist.Preferably, in order to achieve the best surface quality of the stainless steel using proven technology, it is provided that the descaling system has at least one chemical descaling section, in particular a pickling section with at least one container for holding aqueous pickling media, preferably acids.
Zur Unterstützung der chemischen Beizwirkung, um entweder eine Beizzeitverkürzung oder einen größeren Durchsatz erzielen zu können, sind gemäß einem weiteren Merkmal der Erfindung in zumindest einem Behälter Elektroden unterschiedlicher Polarität vorhanden.To support the chemical pickling effect, in order to be able to achieve either a shortening of the pickling time or a higher throughput, electrodes of different polarity are present in at least one container according to a further feature of the invention.
Dabei kann zur Unterstützung der entzundernden Wirkung der Chemikalien zwischen mindestens zwei Behältern mindestens eine Waschbürstmaschine, vorzugsweise mit abrasiven Bürsten, vorgesehen sein.To support the descaling effect of the chemicals, at least one washing brush machine, preferably with abrasive brushes, can be provided between at least two containers.
Mit der gleichen Wirkung ist bei einer weiteren Ausgestaltung der erfindungsgemäßen Anlage nach der Entzunderungsanlage, insbesondere einer Beizsektion, eine Spülsektion vorgesehen, die vorzugsweise mit einer Waschbürstmaschine, vorzugsweise mit abrasiven Bürsten, ausgestattet ist.With a further embodiment of the system according to the invention, after the descaling system, in particular a pickling section, a rinsing section is provided, which is preferably equipped with a washing brush machine, preferably with abrasive brushes.
In der nachfolgenden Beschreibung soll die Erfindung unter Bezugnahme auf die beigefügte(n) Zeichnung(en) näher erläutert werden. Dabei zeigt die Fig. 1 ein Fließschema eines herkömmlichen Verfahrens zur Herstellung von Edelstahlband, die Fig. 2, 3 und 4 zeigen Fließschemata von drei erfindungsgemäßen Verfahrensvarianten, die Fig. 5 stellt schematisch eine herkömmliche Anlage zur Herstellung von Edelstahlband dar und die Fig. 6, 7 und 8 stellen dagegen, ebenfalls schematisch, vorteilhafte Ausführungsbeispiele für Anlagen zur Durchführung des erfindungsgemäßen Verfahrens dar.The invention is to be explained in more detail in the following description with reference to the attached drawing (s). 1 shows a flow diagram of a conventional method for producing stainless steel strip, FIGS. 2, 3 and 4 show flow diagrams of three method variants according to the invention, FIG. 5 schematically represents a conventional system for producing stainless steel strip and FIG. 6 , 7 and 8, on the other hand, represent, likewise schematically, advantageous exemplary embodiments for plants for carrying out the method according to the invention.
Fig. 1 zeigt den Ablauf eines herkömmlichen Verfahrens zur Herstellung eines Edelstahlbandes mit den hintereinander ablaufenden Schritten des Erschmelzens des Edelstahles, des Gießens der Bramme, des Abkühlens der gegossenen Bramme und deren Reinigung vom anhaftenden Zunder, dem nochmaligen Aufheizen, Warmwalzen auf die gewünschte Enddicke des Bandes, dem Abkühlen und Aufwickeln zu einem Bund. Anschließend, jedoch nach einer im Prinzip beliebigen Lagerzeit, kann der Bund vor der Zuführung zur Weiterverarbeitung in einer herkömmlichen kontinuierlichen Glüh- und Beizanlage nochmals geglüht und danach , auf mechanischem und/oder chemischem Weg, entzundert werden, wonach das fertige Band entweder wieder zu einem Bund aufgewickelt oder in Platten zerteilt wird.Fig. 1 shows the sequence of a conventional method for producing a stainless steel strip with the successive steps of melting the stainless steel, pouring the slab, cooling the cast slab and cleaning it from the adhering scale, heating again, hot rolling to the desired final thickness Tape, cooling and winding into a bundle. Subsequently, however, after a storage period that is in principle arbitrary, can the bundle is annealed again in a conventional continuous annealing and pickling system before being fed in for further processing and then descaled mechanically and / or chemically, after which the finished strip is either wound up again into a bundle or cut into plates.
Gemäß einer ersten vorteilhaften Variante des Verfahrens, deren Ablauf in Fig. 2 dargestellt ist, folgt dem Erschmelzen des Edelstahles ein Gießen des Rohlings und das Warmwalzen auf die gewünschte Banddicke. Danach folgt ein Abkühlen und das Aufwickeln des Bandes zu einem Bund. Dieser Bund wird gegebenenfalls nach einer gewissen Lagerzeit diskontinuierlich, das heißt, ohne mit einem anderen Bund beispielsweise durch Schweißen verbunden zu werden, geglüht und entzundert, wonach das fertige Band wieder aufgewickelt - oder auch zu Platten zerteilt - wird.According to a first advantageous variant of the method, the sequence of which is shown in FIG. 2, the melting of the stainless steel is followed by casting of the blank and hot rolling to the desired strip thickness. This is followed by cooling and winding the tape into a bundle. This bundle is, if necessary, discontinuously annealed and descaled after a certain storage period, that is to say without being connected to another bundle, for example by welding, after which the finished strip is rewound - or also cut into plates.
Falls das Band gleich in der gewünschten Dicke gegossen wird, wie dies gemäß einer zweiten, in Fig. 3 dargestellten Variante des Verfahrens der Fall ist, folgt dem Abkühlen des bereits die Enddicke aufweisenden Bandes direkt das diskontinuierliche Glühen und Entzundern des Bandes. Schließlich kann dieses wieder aufgewickelt oder zu Platten zerteilt werden.If the strip is immediately cast in the desired thickness, as is the case according to a second variant of the method shown in FIG. 3, the strip, which is already of the final thickness, is cooled immediately by the discontinuous annealing and descaling of the strip. Finally, it can be rewound or cut into plates.
Der in Fig. 4 schematisch dargestellte Verfahrensablauf ergänzt den zuvor beschriebenen Ablauf noch dahingehend, daß allenfalls bei Bedarf nach dem Warmwalzen des Bandes und dem darauffolgenden Abkühlen ein Glühen des Bandes erfolgen kann. Erst nach dem nochmaligen Abkühlen folgt dann auf diskontinuierliche Weise nochmals ein Glühen und daran direkt anschließend das Entzundern des Bandes sowie dessen Aufwickeln oder Zerteilen.The process sequence shown schematically in FIG. 4 complements the previously described sequence to the extent that, if necessary, the strip can be annealed after it has been hot-rolled and then cooled. Only after the repeated cooling, there is then an intermittent annealing and immediately followed by the descaling of the strip and its winding or cutting.
In Fig. 5 ist schematisch eine Anlage zur Herstellung von Edelstahlband nach dem herkömmlichen Verfahren dargestellt. In der Pfanne 1 wird der Edelstahl erschmolzen und in der Stranggußanlage 2 gegossen. Von einer Trenneinrichtung 3 werden Stücke mit vorbestimmter Länge abgetrennt, die dann einem Glühofen 4 zugeführt, anschließend in einem Warmwalzwerk 5 auf die gewünschte Enddicke des Bandes gewalzt, in einer Kühlanlage 6 beispielsweise durch Besprühen mit Wasser oder Luftkühlung abgekühlt und schließlich vorzugsweise auf einer Aufhaspel 7 bundweise aufgewickelt werden.5 schematically shows a plant for the production of stainless steel strip according to the conventional method. In
Nacheinander werden derartige Bunde von Edelstahlbändern weiters einer kontinuierlichen Glüh- und Beizanlage zugeführt. Kontinuierlich heißt in diesem Zusammenhang, daß die hintereinander angelieferten Bänder von einer Abhaspel 8 abgewickelt, in einer Schweißanlage 10 miteinander verbunden und als ein "kontinuierliches Band" durch die nachfolgenden Anlagen gezogen werden. Um während des Verschweißens zweier Bänder den kontinuierlichen Durchlauf des vorhergehenden Bandabschnittes nicht zu behindern, muß das Band für diese Zeitspanne aus einem Bandspeicher 11 entnommen werden. Das nochmalige Glühen in der Glühanlage 12 kann oftmals entfallen, während aber die mechanische Vorentzunderung in der Entzunderungsanlage 13, beispielsweise einem "Shot-Blaster", und die chemische Entzunderung in einer Beizsektion 14, allenfalls mit Stromunterstützung, für die geforderte Oberflächenqualität des Bandes unbedingt erforderlich sind. Nach einer Spülanlage 15 zur Entfernung noch auf dem Band befindlicher Beizflüssigkeit gelangt das Band neuerlich in einen Speicher 16, um das Trennen der einzelnen Bandabschnitte durch die Querteilanlage 17 nicht zu behindern, und wird schließlich wieder zu einem Bund auf einer Aufhaspel 18 aufgewickelt.Such bundles of stainless steel strips are further fed to a continuous annealing and pickling system. In this context, continuous means that the strips delivered one behind the other are unwound from a
Die in Fig. 6 dargestellte Ausführungsform der erfindungsgemäßen Anlage umfaßt ebenfalls die Pfanne 1 und die Stranggußanlage 2, von der der gegossene Rohling aber direkt dem Warmwalzwerk 5 zugeführt und nach anschließender Kühlung in der Kühlanlage 6 auf einer Aufhaspel 7 aufgewickelt wird.The embodiment of the plant according to the invention shown in Fig. 6 also includes the
Jeder Bund wird von der Abhaspel 8 abgewickelt und direkt einem Glühofen 12 zugeführt, ohne mit einem vorhergehenden oder nachfolgenden Bund verbunden zu werden. Der Anfang jedes Bandes wird durch den Glühofen 12, die direkt anschließende mechanische Entzunderungsanlage 13, die chemische Entzunderungsanlage 14 und die Spülanlage 15 geschoben, bis er die Aufhaspel 18 erreicht. Dort wird der Bandanfang vorzugsweise festgeklemmt und kann dann ausschließlich oder zusammen mit den Vorrichtungen zum Durchschieben des Bandanfanges das Band durch die Anlagen 12, 13, 14 und 15 transportieren, wobei das Band wieder aufgewickelt wird.Each coil is unwound from the
Zwischen jeweils zwei Beizbottichen der Beizanlage 14 kann vorteilhafterweise eine Waschbürstmaschine 14a vorgesehen sein, und statt der Aufhaspel 18 könnte eine Querteilanlage zur Zerteilung des fertigen Bandes in Platten vorgesehen sein.A washing brush machine 14a can advantageously be provided between each two pickling tubs of the
Eine weitere vorteilhafte Ausführungsform für eine erfindungsgemäße Anlage sieht vor, wie in Fig. 7 dargestellt ist, direkt in einer Bandgußanlage 2a ein Band mit der gewünschten Enddicke zu gießen und in einer Kühlanlage 6 abzukühlen. Dieses Band wird anschließend direkt dem Glühofen 12 zugeführt, durch diesen hindurchgeschoben und nach neuerlichem Abkühlen in einer weiteren Kühlanlage 6 der mechanischen Entzunderungsanlage 13 und der chemischen Entzunderungsanlage 14 zugeführt, durch die das Band ebenfalls durchgeschoben wird, bis es nach Passieren der Spülanlage 15 die Aufhaspel 18 oder eine Querteilanlage erreicht hat.A further advantageous embodiment for a system according to the invention provides, as shown in FIG. 7, to cast a strip with the desired final thickness directly in a
Gemäß der in Fig. 8 dargestellten Variante der Anlage wird das Band nach der Bandgußanlage 2a vorerst auf die gewünschte Dicke warmgewalzt und durchläuft anschließend die im vorigen Absatz beschriebenen Verfahrensschritte und Anlagen, mit der Ausnahme, daß sich dem Glühen direkt die Entzunderung anschließt.According to the variant of the system shown in FIG. 8, the strip is first hot-rolled to the desired thickness after the
An einer Versuchsanlage wurde kontinuierlich ein Edelstahlband der Qualität AISI 304 in einer Dimension von 350 mm Breite und 10 mm Dicke gegossen, auf 60°C Bandtemperatur abgekühlt und anschließend in einer chemischen Beizanlage vom gebildeten Zunder befreit. Der erste Teil des Bandes wurde mit einer Querteilschere zu 1,5 m langen Platten geschnitten, der Rest auf einer Aufhaspel aufgewickelt. Die technologischen Eigenschaften des Edelstahlbandes entsprachen den Eigenschaften eines konventionell hergestellten Bandes.A stainless steel strip of quality AISI 304 with a dimension of 350 mm width and 10 mm thickness was continuously cast on a test plant, cooled to a strip temperature of 60 ° C. and then freed from the scale formed in a chemical pickling plant. The first part of the tape was cut with a pair of cross-cut scissors into 1.5 m long plates, the rest was wound up on a reel. The technological properties of the stainless steel belt corresponded to the properties of a conventionally manufactured belt.
An der gleichen Versuchsanlage wurde kontinuierlich ein Edelstahlband der Qualität AISI 304 in den Dimensionen 350 mm breit und 13 mm dick gegossen, etwas abgekühlt und direkt in einem Warmwalzwerk auf eine Enddicke von 5 mm gewalzt. Nach dem Abkühlen des gewalzten Bandes auf 45°C wurde das Edelstahlband direkt durch eine mechanische und chemische Entzunderungsanlage geschoben, gebeizt, gespült und getrocknet. Erst nach dem Trocknen wurde das Band das erste Mal aufgewickelt. Die technologischen Eigenschaften des Edelstahlbandes entsprachen den Eigenschaften eines konventionell hergestellten Bandes.On the same test system, a stainless steel strip of AISI 304 quality in the dimensions 350 mm wide and 13 mm thick was continuously cast, cooled somewhat and rolled directly to a final thickness of 5 mm in a hot rolling mill. After the rolled strip had cooled to 45 ° C., the stainless steel strip was pushed directly through a mechanical and chemical descaling system, pickled, rinsed and dried. It was only after drying that the tape was wound up for the first time. The technological properties of the stainless steel belt corresponded to the properties of a conventionally manufactured belt.
Es wurde ein Edelstahlband der Qualität AISI 316 in den Dimensionen 320 mm breit und 8 mm dick gegossen, auf Raumtemperatur abgekühlt und zu einem Bund aufgewickelt. Nach einer Lagerzeit von einigen Tagen wurde dieses Band in einer getrennten, kontinuierlich arbeitenden Glüh- und Beizlinie mit einem induktiv beheizten Ofen auf 1100°C - 1300°C aufgeheizt, danach mit Luft und Wasser auf ca 50°C abgekühlt, mechanisch und chemisch entzundert und nach dem Spülen und Trocknen erneut aufgewickelt.A stainless steel band of AISI 316 quality in dimensions of 320 mm wide and 8 mm thick was cast, cooled to room temperature and wound up into a bundle. After a storage period of a few days, this strip was heated in a separate, continuously working annealing and pickling line with an inductively heated oven to 1100 ° C - 1300 ° C, then cooled to approx. 50 ° C with air and water, descaled mechanically and chemically and rewound after rinsing and drying.
Ein Edelstahlband der Qualität AISI 430 in den Dimensionen 350 mm breit und 15 mm dick wurde gegossen, direkt anschließend in einem Warmwalzwerk auf 7 mm Banddicke gewalzt und danach auf Raumtemperatur abgekühlt und aufgewickelt. Nach einer Lagerzeit von mehreren Tagen wurde dieses Edelstahlband in einer getrennten, kontinuierlich arbeitenden Glüh- und Beizlinie erneut geglüht sowie mechanisch und chemisch entzundert und nach dem Spülen mit Wasser und dem Trocknen wieder aufgewickelt.A stainless steel strip of the quality AISI 430 in the dimensions 350 mm wide and 15 mm thick was cast, then rolled in a hot rolling mill to 7 mm strip thickness and then cooled to room temperature and wound up. After a storage period of several days, this stainless steel strip was annealed again in a separate, continuously working annealing and pickling line, mechanically and chemically descaled and rewound after rinsing with water and drying.
Ein weiteres Edelstahlband der Qualität AISI 430 in den gleichen Dimensionen wie beim vorangehenden Beispiel wurde gegossen, nachgewalzt und abgekühlt. Dieses Band wurde jedoch nicht aufgewickelt, sondern durch eine induktiv betriebene Glühanlage geschoben, in der das Band erneut aufgeheizt, danach abgekühlt und direkt anschließend in eine Entzunderungsanlage geschoben, wo es vom gebildeten Zunder an der Oberfläche befreit wurde. Erst dann wurde das Edelstahlband zum ersten Mal aufgewickelt.Another AISI 430 stainless steel strip in the same dimensions as in the previous example was cast, rerolled and cooled. However, this strip was not wound up, but pushed through an induction-operated annealing system, in which the strip was reheated, then cooled and then immediately pushed into a descaling system, where it was freed from the scale formed on the surface. Only then was the stainless steel band wound up for the first time.
Bei allen Versuchen gemäß den Beispielen 1 bis 5 konnte kein negativer Einfluß der Behandlungsart auf die gewünschten technologischen Eigenschaften der Bänder festgestellt werden.In all tests according to Examples 1 to 5, no negative influence of the type of treatment on the desired technological properties of the tapes could be determined.
Ein konventionell hergestelltes Edelstahlband der Qualität AISI 304 wurde nach dem Warmwalzen von einer Gesamtbreite von 1450 mm in ein Band mit einer Breite von 300 mm und ein weiteres Band von 1150 mm geteilt.A conventionally produced stainless steel strip of quality AISI 304 was cut after hot rolling from a total width of 1450 mm into a strip with a width of 300 mm and a further strip of 1150 mm.
Das breitere Band wurde konventionell in einer kontinuierlich arbeitenden Glüh- und Beizanlage geglüht, mechanisch und chemisch entzundert und wieder aufgewickelt. Das schmale Band wurde in einer diskontinuierlich arbeitenden Schubglüh- und Schubbeizanlage mit einem induktiv beheizten Ofen geglüht, anschließend ebenfalls mechanisch und chemisch entzundert und aufgewickelt. Bei einem Vergleich der technologischen Eigenschaften konnte kein Unterschied zwischen den beiden unterschiedlich behandelten Bändern gefunden werden.The wider strip was conventionally annealed in a continuously working annealing and pickling plant, mechanically and chemically descaled and rewound. The narrow strip was annealed in a discontinuous thrust annealing and thrust pickling system with an inductively heated furnace, then also mechanically and chemically descaled and wound up. When the technological properties were compared, no difference could be found between the two tapes treated differently.
Ein konventionell hergestelltes Edelstahlband der Qualität AISI 316 wurde nach dem Warmwalzen von einer Gesamtbreite von 1350 mm in ein Band mit einer Breite von 350 mm und ein Band mit einer Breite von 1000 mm geteilt. Während das breitere Band konventionell in einer kontinuierlich arbeitenden Glüh- und Beizanlage geglüht, mechanisch und chemisch entzundert und wieder aufgewickelt wurde, durchlief das schmälere Band eine diskontinuierlich arbeitende Schubglüh- und Schubbeizanlage. Nach dem Glühen im induktiv beheizten Glühofen, dem anschließenden mechanischen und chemischen Entzundern und aufwickeln konnte wiederum keinerlei Unterschied bei den technologischen Eigenschaften der beiden Bänder gefunden werden.A conventionally produced stainless steel strip of the quality AISI 316 was divided after the hot rolling from a total width of 1350 mm into a strip with a width of 350 mm and a strip with a width of 1000 mm. While the wider strip was conventionally annealed, mechanically and chemically descaled and rewound in a continuously working annealing and pickling system, the narrower strip went through a discontinuous thrust annealing and thrust pickling system. After the annealing in the induction heated annealing furnace, the subsequent mechanical and chemical descaling and winding, again no difference could be found in the technological properties of the two strips.
Claims (23)
- Process for production of stainless steel strip or plates in which the cast material is- annealed and cooled in batches and,- de-scaled immediately after the last heat treatment stage without intermediate storage,- pushed both through an annealing furnace as well as through a de-scaling plant until the leading edge of the strip comes out of the de-scaling plant,- pulled through the annealing furnace and the de-scaling plant by the devices after the de-scaling plant after the leading edge of the strip comes out of the de-scaling plant.
- Process for production of stainless steel strip or plates in which the material is- cast and cooled in batches and,- de-scaled immediately afterwards without intermediate storage,- pushed both through an annealing furnace as well as through a de-scaling plant until the leading edge of the strip comes out of the de-scaling plant,- pulled through the annealing furnace and the de-scaling plant by the devices after the de-scaling plant after the leading edge of the strip comes out of the de-scaling plant.
- Process according to claim 2, characterised by the material first being hot-rolled after casting, cooled, then annealed, cooled and de-scaled without the annealed material going into intermediate storage after the final heat treatment.
- Process according to claim 1 or 2, characterised by the strip material being fed to a coiling device, preferably a recoiler, and coiled there.
- Process according to claim 4, characterised by the material being pulled through the plant by the recoiling device.
- Process according to claim 1 or 2, characterised by the material being cut into plates after leaving the de-scaling plant.
- Process according to one of the claims 1 to 6, characterised by the strip material being smoothed, if necessary before coiling, on a skin-pass plant for example.
- Process according to one of the claims 1 to 7, characterised by the material being de-scaled in a chemical process by pickling in an aqueous medium, immediately after mechanical de-scaling if necessary.
- Process according to claim 8 characterised by the de-scaling process using acids, for example, nitric acid, sulphuric acid, hydrochloric acid, hydrofluoric acid, or a mixture of at least two of these acids and/or aqueous solutions of one or more salts of these acids with the metals contained in the material.
- Process according to claim 9, characterised by the material undergoing electrolytic treatment before chemical de-scaling.
- Process according to claim 10, characterised by the material having alternately anodic and cathodic poling.
- Process according to one of the preceding claims, characterised by the material being heated inductively in the annealing furnace.
- Device for production of stainless steel strip or plates, containing :- a casting line for the raw material,- a cooling device (6) for the cast material,- a push-type annealing device (12),- a further cooling device (6),- a push-type pickling plant (13,14) immediately after the cooling device.
- Device for production of stainless steel strip or plates, containing- a hot rolling mill,- a cooling device (6) for the rolled material,- a push-type annealing device (12),- a push-type pickling plant immediately after the annealing device.
- Device according to claims 13 or 14, characterised in that the annealing device (12) is designed as an inductive annealing device.
- Device according to one of the claims 10 to 13, characterised by devices being provided after the de-scaling plant (13, 14) to grip the leading end of the material coming out of the de-scaling plant, preferably driven coiling devices (18) such as a recoiler.
- Device according to one of the claims 13 to 16 characterised by a set of transverse shears being included after the de-scaling plant (13, 14).
- Device according to claim 16 or 17, characterised by a device being included to smooth the material, preferably a strip smoothing device such as a skin-pass mill, between the de-scaling plant (13, 14) and the coiling device (18) or transverse shears.
- Device according to one of the claims 13 to 18, characterised by the de-scaling plant having at least one chemical de-scaling section (14), in particular a pickling section with at least one tank to hold aqueous pickling media, preferably acids.
- Device according to claim 19, characterised by at least one of the tanks containing electrodes of different polarity.
- Device according to claim 19 or 20, characterised by at least one washing and brushing machine (14a) being provided between at least two tanks.
- Device according to claims 19 to 21, characterised by a rinsing section (15), preferably with a washing and brushing machine, preferably with abrasive brushes, being included after the de-scaling plant (13, 14), in particular a pickling section (14).
- Device according to claims 21 or 22, characterised by the washing and brushing machine being fitted with abrasive brushes.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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AT0137593A AT404907B (en) | 1993-07-13 | 1993-07-13 | METHOD AND SYSTEM FOR PRODUCING STAINLESS STEEL STRIP |
AT1375/93 | 1993-07-13 | ||
PCT/EP1994/002215 WO1995002706A1 (en) | 1993-07-13 | 1994-07-06 | Method and plant for the manufacture of special steel blanks |
Publications (2)
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EP0708843A1 EP0708843A1 (en) | 1996-05-01 |
EP0708843B1 true EP0708843B1 (en) | 1997-03-26 |
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EP94924719A Expired - Lifetime EP0708843B1 (en) | 1993-07-13 | 1994-07-06 | Method and plant for the manufacture of special steel blanks |
Country Status (11)
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US (1) | US5725696A (en) |
EP (1) | EP0708843B1 (en) |
KR (1) | KR100207835B1 (en) |
AT (1) | AT404907B (en) |
AU (1) | AU697873B2 (en) |
BR (1) | BR9407126A (en) |
DE (1) | DE59402245D1 (en) |
ES (1) | ES2100732T3 (en) |
FI (1) | FI102548B1 (en) |
RU (1) | RU2112812C1 (en) |
WO (1) | WO1995002706A1 (en) |
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JP2750096B2 (en) * | 1995-05-08 | 1998-05-13 | 新日本製鐵株式会社 | Strip continuous casting hot rolling heat treatment pickling equipment and method for producing pickling coil |
DE19532278B4 (en) * | 1995-09-01 | 2006-07-27 | Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh | Method for producing a cold-rolled strip in one pass |
DE19606305C1 (en) * | 1996-02-08 | 1997-10-02 | Mannesmann Ag | Method and device for in-line pickling of hot strips behind thin slab production plants |
US6264769B1 (en) | 1999-05-21 | 2001-07-24 | Danieli Technology, Inc. | Coil area for in-line treatment of rolled products |
IT1318893B1 (en) * | 2000-09-15 | 2003-09-19 | Danieli & Co Ohg S P A | DEVICE FOR THE ONLINE TREATMENT OF LAMINATED METAL PRODUCTS |
CN101585046B (en) * | 2008-05-23 | 2011-05-11 | 宝山钢铁股份有限公司 | SUS304 stainless steel cold-rolled plate producing method omitting annealing before cold rolling |
DE102014221068A1 (en) * | 2014-10-16 | 2016-04-21 | Sms Group Gmbh | Plant and method for the production of heavy plates |
TWI625172B (en) * | 2016-09-19 | 2018-06-01 | Composite cold rolling line | |
JP6748375B2 (en) * | 2016-10-19 | 2020-09-02 | Jfeスチール株式会社 | Descaling method for Si-containing hot rolled steel sheet |
EP3385008A1 (en) * | 2017-04-04 | 2018-10-10 | Primetals Technologies Austria GmbH | Descaling device and method for chemically descaling a metal strip |
FI128282B (en) * | 2019-01-28 | 2020-02-28 | Outokumpu Oy | Method for manufacturing of stainless steel strips |
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DE656140C (en) * | 1935-08-30 | 1938-01-29 | Hoesch Koeln Neuessen Akt Ges | Machine for brushing metal sheets |
GB1333943A (en) * | 1971-07-29 | 1973-10-17 | Mulcahy E W | Pickling metals |
US4885042A (en) * | 1987-05-22 | 1989-12-05 | Kawasaki Steel Corp. | Method and apparatus for preliminary treatment of stainless steel for cold rolling |
NL8702050A (en) * | 1987-09-01 | 1989-04-03 | Hoogovens Groep Bv | METHOD AND APPARATUS FOR THE MANUFACTURE OF TIRE-DEFORMING STEEL WITH GOOD MECHANICAL AND SURFACE PROPERTIES. |
JPH0220610A (en) * | 1988-07-06 | 1990-01-24 | Nisshin Steel Co Ltd | Manufacture of cold rolled stainless steel strip having good property for buffing |
US4996998A (en) * | 1988-08-18 | 1991-03-05 | Continental Installers Corporation | Strip metal treating system |
US5292374A (en) * | 1988-11-15 | 1994-03-08 | Maschinenfabrik Andritz Actiengesellschft | Process and plant for pickling stainless steel strip |
AT394734B (en) * | 1988-11-15 | 1992-06-10 | Andritz Ag Maschf | METHOD AND SYSTEM FOR STICKING STAINLESS STEEL TAPES |
JPH0729122B2 (en) * | 1988-12-23 | 1995-04-05 | 川崎製鉄株式会社 | Manufacturing method of stainless pretreated steel strip for cold rolling |
US5279141A (en) * | 1988-12-23 | 1994-01-18 | Kawasaki Steel Corporation | Apparatus for pre-processing stainless steel strip intended to be cold-rolled |
JPH02276750A (en) * | 1989-03-10 | 1990-11-13 | Sms Schloeman Siemag Ag | Transfer system of plate material in material handling plant of metal plate in particular |
JPH0742513B2 (en) * | 1989-03-14 | 1995-05-10 | 新日本製鐵株式会社 | Method for producing austenitic stainless steel sheet |
US4971992A (en) * | 1989-03-27 | 1990-11-20 | Hoechst-Roussel Pharmaceuticals Inc. | Carbonate derivatives of eseroline |
JP2613317B2 (en) * | 1990-04-20 | 1997-05-28 | 川崎製鉄株式会社 | Annealing and descaling of stainless steel strip |
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1993
- 1993-07-13 AT AT0137593A patent/AT404907B/en not_active IP Right Cessation
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1994
- 1994-07-06 RU RU96102589A patent/RU2112812C1/en not_active IP Right Cessation
- 1994-07-06 DE DE59402245T patent/DE59402245D1/en not_active Expired - Fee Related
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- 1994-07-06 EP EP94924719A patent/EP0708843B1/en not_active Expired - Lifetime
- 1994-07-06 ES ES94924719T patent/ES2100732T3/en not_active Expired - Lifetime
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- 1994-07-06 US US08/581,567 patent/US5725696A/en not_active Expired - Fee Related
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1996
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AU697873B2 (en) | 1998-10-22 |
EP0708843A1 (en) | 1996-05-01 |
AU7491294A (en) | 1995-02-13 |
FI102548B (en) | 1998-12-31 |
DE59402245D1 (en) | 1997-04-30 |
KR100207835B1 (en) | 1999-07-15 |
FI960146A (en) | 1996-03-12 |
US5725696A (en) | 1998-03-10 |
FI960146A0 (en) | 1996-01-12 |
BR9407126A (en) | 1996-09-10 |
AT404907B (en) | 1999-03-25 |
RU2112812C1 (en) | 1998-06-10 |
ES2100732T3 (en) | 1997-06-16 |
KR960703441A (en) | 1996-08-17 |
WO1995002706A1 (en) | 1995-01-26 |
FI102548B1 (en) | 1998-12-31 |
ATA137593A (en) | 1998-08-15 |
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