EP0769333A1 - Method for continuously producing, in a line, rolled sheet metal strip of stainless steel with improved surface condition - Google Patents

Method for continuously producing, in a line, rolled sheet metal strip of stainless steel with improved surface condition Download PDF

Info

Publication number
EP0769333A1
EP0769333A1 EP96402086A EP96402086A EP0769333A1 EP 0769333 A1 EP0769333 A1 EP 0769333A1 EP 96402086 A EP96402086 A EP 96402086A EP 96402086 A EP96402086 A EP 96402086A EP 0769333 A1 EP0769333 A1 EP 0769333A1
Authority
EP
European Patent Office
Prior art keywords
strip
pickling
cold rolling
sheet metal
line
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.)
Granted
Application number
EP96402086A
Other languages
German (de)
French (fr)
Other versions
EP0769333B1 (en
Inventor
Jean Veyer
Joel Tagalian
Jean-Pierre Malingriaux
Bernard Viallatte
Michel Ternisien
Bernard Tetu
Henri Giraud
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ugine SA
Original Assignee
USINOR Sacilor SA
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9483685&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0769333(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by USINOR Sacilor SA filed Critical USINOR Sacilor SA
Publication of EP0769333A1 publication Critical patent/EP0769333A1/en
Application granted granted Critical
Publication of EP0769333B1 publication Critical patent/EP0769333B1/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • C23G3/027—Associated apparatus, e.g. for pretreating or after-treating
    • C23G3/028—Associated apparatus, e.g. for pretreating or after-treating for thermal or mechanical pretreatment
    • 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
    • B21B1/24—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 in a continuous or semi-continuous process
    • B21B1/28—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 in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
    • 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
    • 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

Definitions

  • the invention relates to a process for the production, on a continuous line, of a strip of laminated stainless steel sheet having an improved surface finish.
  • the disadvantage of this process is due in particular to the large number of tools on which the strip of hot-worked sheet must be moved, with the consequence of maintenance treatment costs, of personnel, numerous intermediate handling operations with risks of damage to the sheet metal strip, loss of metal by dropping, treatment times generally greater than a week, or even two weeks or more, due to the expectations in front of each tool, expectations requiring stocks, storage areas, and corresponding storage costs.
  • the object of the invention is to produce, continuously, a strip of stainless steel sheet having on the surface a characteristic determined in roughness and in uniformity of appearance, sheet strip obtained on a single industrial line, the process production ensuring a consequent reduction in the number of passes in the cold rolling operation, and making it possible to economically produce the whole operations necessary to obtain a sheet metal strip having a defined surface quality.
  • FIG. 1 presents a diagram showing the principle, in a cold rolling operation, of the evolution of the surface condition of a strip of sheet metal, from the roughness point of view, as a function of the number of passes and the reduction rate of the cold rolling.
  • FIG. 2 shows a curve of the rolling forces as a function of the reduction rate of cold rolling for two qualities of the rolling oil used.
  • Figure 3 is a diagram of the rolling line according to the invention.
  • Figure 4 is another diagram of the rolling line according to the invention.
  • the invention relates to a process for the production, on-line, continuously, of a strip of laminated stainless steel sheet having an improved surface condition 2B characterized by a roughness Ra of less than 0.25 micrometer, or even less than 0 , 15 micrometer in the long direction and in the cross direction, the process not generating a change of apparent color, aureole or trace of oxide.
  • a strip of sheet metal produced hot is subjected, first of all, to leveling under tension.
  • the leveling under tension has the function of causing, by the traction which generates a residual elongation of 1 to 5% of the sheet metal strip, flaking of the oxide layer of said strip.
  • the leveling associated with the traction ensures, at this stage of the process, an improvement in the flatness of the sheet metal strip, an improvement which influences the following operations such as shot blasting.
  • the sheet metal strip is subjected to a pickling, which ensures an improved surface finish of the sheet metal strip, compared to a conventional method of producing a sheet metal strip, as described above, in the prior art.
  • curves A and B present a diagram showing the principle, in a cold rolling operation, of the evolution of the surface state of a strip of sheet metal, from the roughness point of view, as a function of the number of passes and reduction rate.
  • the evolution of the surface condition in the conventional process is referenced by curve A, that of the invention is referenced by curve B.
  • the conventional method in which the strip of sheet metal has undergone, before cold rolling, annealing followed by shot blasting and pickling, makes it possible to obtain a sheet strip having a roughness Rt of 25 to 40 micrometers and a Ra from 2.5 to 4 micrometers.
  • the strip before cold rolling has a roughness Rt of 10 to 20 micrometers and a Ra of 1 to 2 micrometers.
  • the strip is also completely free of oxide.
  • the sheet strip is subjected to abrasion, for example abrasive brushing, brushing being carried out before, after, or during the primary pickling operation.
  • abrasion for example abrasive brushing, brushing being carried out before, after, or during the primary pickling operation.
  • the sheet metal strip may be subjected to a peening operation which facilitates the detachment of the scale without unduly disturbing it. the surface of the sheet.
  • the strip of sheet metal produced hot and not annealed has high mechanical characteristics which, associated with mild blasting conditions, allow blasting without harmful disturbance of the surface of the sheet strip.
  • the leveling operations under tension and associated stripping are intended to provide the surface of the sheet metal strip with a roughness state such that it makes it possible to reduce the number of passes in a substantial manner.
  • cold rolling operation This is shown by curve B in FIG. 1.
  • the reduction in the number of passes in cold rolling imposes rolling conditions which ensure a reduction in the roughness of the sheet strip.
  • the total reduction in thickness of the sheet metal strip is optimized so as not to exceed a rolling force of 800 tonnes per meter width exerted on the rolls of the rolling mills. Beyond this limit, a thick and rough transfer layer is formed on the working rolls, which prints the strip of laminated sheet metal to give it a high roughness corresponding to a Ra of around 1 micrometer.
  • the diameter of the rolling mill rolls is less than 180 millimeters and preferably less than 150 millimeters to allow high reductions in strip thickness with rolling forces less than 800 tonnes per meter width.
  • Such cylinders provide an improvement in roughness during cold rolling.
  • the cylinders of the last cage must be polished to have a very low roughness and preferably less than 0.1 micrometer.
  • paraffinic laminating oils containing one or more friction reducing additives the additives being preferably one or more several esters whose total concentration in the oil is greater than or equal to 10%.
  • the rolling oils used make it possible to achieve the above reduction rates in an even smaller number of passes, two passes for example, without increasing the rolling forces.
  • the use of a paraffinic oil containing at least 10% of ester allows, with identical rolling effort, a reduction in thickness of the sheet metal strip of 35% compared to, the reduction of 25% obtained with a conventional oil containing only 1% ester.
  • FIG. 2 shows two curves a and b corresponding to the rolling forces authorized as a function of different rolling reduction rates for two concentrations of ester of a rolling oil.
  • the strip is subjected to brushing which may be abrasive, brushing being carried out before, after or during the chemical pickling operation.
  • the strip of hot-rolled sheet metal planed under tension can be, before pickling and or brushing, subjected to a peening, facilitating the detachment of the scale.
  • the sheet metal strip produced by the process according to the invention has a surface quality corresponding to a roughness Ra of less than 0.25 micrometers, which can reach a roughness Ra of less than 0.15 micrometers.
  • the invention also relates, as shown in FIG. 3, to an industrial line 1 for implementing the process, an industrial line 1 which includes, in an associated manner, a leveler 2 under traction, and a primary pickling station 3, ensuring a stop of the online pickling operation simultaneously with the stopping of the cold rolling device.
  • the treatment of the working rolls of the rolling mill must give said rolls sufficient wear resistance to maintain the quality of their surface during the rolling of at least one strip. wound up to 30 tonnes.
  • the cylinders used are made of high-speed steel supercharged with vanadium or even sintered, and must be changed practically with each rolled coil. There follows a need to stop the line regularly, each time the working rolls are changed.
  • the use of a pickling bath upstream of the cold rolling device poses the problem of frequent stops of the rolling mill and of controlling the time of passage of the strip in the pickling bath. Indeed, the different stops of the sheet metal strip on a single line requires management of the strip reserve by means of strip accumulators placed between the different stations and devices.
  • the primary pickling station 3 is followed by a cold rolling device 4.
  • the pickling station 3 comprises a tank of an acid bath provided with a device for removing the strip of sheet metal in immersion .
  • the pickling station 3 is of the spray type.
  • the spray pickling station authorizes an instant pickling stop by stopping the spraying simultaneously with the stopping of the rolling mill.
  • the primary pickling station 3 may be an electrolytic pickling station comprising a tank, for example of neutral salt, the station being stopped by stopping the electrical supply to the electrolytic tank.
  • the pickling station 3 provided with a pickling stop means, makes it possible to reduce the volume or to eliminate the strip accumulator 13 generally placed between the pickling station 3 and the cold rolling device 4.
  • Line 1 comprises, after the non-reversible cold rolling device 4 comprising at most three cages 5, an annealing device 6 for the work hardened sheet strip, a final pickling station 7, and a cold rolling device of the type "skin pass" 8.
  • Line 1 can also include, placed after the leveler under tension 2, as shown in FIG. 4, a blasting station 9 and or a brushing means 10 which can be abrasive, helping to refine the quality of the surface of the sheet metal strip before cold rolling to obtain an improved surface finish of the sheet metal strip after said cold rolling reduced in number of passes.
  • a blasting station 9 and or a brushing means 10 which can be abrasive, helping to refine the quality of the surface of the sheet metal strip before cold rolling to obtain an improved surface finish of the sheet metal strip after said cold rolling reduced in number of passes.
  • the line can also comprise, after the cold rolling device of the "skin pass" type, a leveler 11 associated with a shear 12.
  • a second shear 12 can be placed after the leveler under tension 2.
  • a strip of hot-rolled austenitic steel sheet having a thickness of 2 mm is subjected to leveling under tension producing a residual elongation of 3.5%.
  • the sheet metal strip is then pickled in two acid baths H 2 SO 4 . At this stage of the process, the sheet metal strip has a roughness of less than 1.5 micrometers.
  • the sheet metal strip is then subjected to cold rolling in three passes on a ZHi type cold rolling train.
  • the sheet metal strip is cold rolled at a reduction rate of 50%.
  • the sheet metal strip is then annealed and pickled. After these short cold rolling, annealing and pickling operations, it has a roughness Ra of less than 0.25 micrometer.
  • the sheet metal strip is subjected to a one-pass cold rolling operation of the "skin pass" type producing an elongation of 0.8%.
  • the sheet metal strip then has a roughness Ra of less than 0.1 micrometer.
  • a strip of titanium-stabilized ferritic steel sheet, hot-rolled and having a thickness of 3 mm is subjected to leveling under tension producing a residual elongation of 4%.
  • the sheet metal strip is then pickled in an acid bath H 2 SO 4 and then in an acid bath HNO 3 .
  • the sheet metal strip has a roughness Ra of less than 2 micrometers.
  • the sheet metal strip is then subjected to a cold rolling in two passes at a reduction rate of 50% on rolling mills of the ZHi type, then annealed and pickled. After these short cold rolling, annealing and pickling operations, it has a roughness Ra of less than 0.25 micrometer.
  • the sheet metal strip is then subjected to a cold rolling operation in a pass of the "skin pass" type producing a band extension of 0.8%.
  • the sheet metal strip then has a roughness of less than 0.15 micrometers.
  • the strip of stainless steel sheet is pickled with an aqueous pickling solution consisting of hydrochloric acid, ferric and ferrous pickling ions in solution, and, in order to maintain a constant pickling power of the solution aqueous hydrochloric acid to maintain the concentration of Fe 3+ ions, by reoxidation of the Fe 2+ ions generated during pickling, the REDOX potential being maintained at a value between 0 and 800 mV, potential measured between a platinum electrode and an Ag / agCl reference electrode placed in the solution.
  • an aqueous pickling solution consisting of hydrochloric acid, ferric and ferrous pickling ions in solution
  • the pickling operations before rolling, in a continuous line ensure optimum quality of the surface condition of the strip.
  • the effectiveness of pickling can allow, depending on the quality of the sheet metal strip, the elimination of mechanical treatments of the leveling type under tension, shot blasting, brushing, significantly reducing the industrial line of production of sheet metal strip d 'steel.
  • the reduction in the number of passes in cold rolling allows the establishment of a continuous line comprising a reduced cold rolling device generating an economy on investment, for obtaining a quality sheet, and also, a significant saving on the maintenance costs of the line and the personnel.
  • the continuous line thus generates a very significant reduction in the duration of the treatment, therefore in stocks of semi-finished products and a elimination of intermediate handling generating defects and loss of metal.

Landscapes

  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (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)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Coating With Molten Metal (AREA)
  • Chemically Coating (AREA)
  • Laminated Bodies (AREA)

Abstract

The hot rolled stainless steel strip is subjected to a continuous surface treatment process comprising flattening the surface whilst residually elongating the strip by 1-5% in order to crack the oxide coating, pickling to remove the oxide, cold rolling in a max. of three passes, final annealing, final pickling, and skin passing. Also claimed is the industrial line for carrying out the above process, with the pickling station being a spray or electrolytic-type process. In the latter the electrolyte is a neutral salt or phosphoric acid. The cold rolling appts. is at least three cages of multi-cylinders of dia. below 180, pref. below 150 mm.

Description

L'invention concerne un procédé d'élaboration, sur une ligne, en continu, d'une bande de tôle laminée d'acier inoxydable présentant un état de surface amélioré.The invention relates to a process for the production, on a continuous line, of a strip of laminated stainless steel sheet having an improved surface finish.

Il est connu différents procédés d'élaboration d'une bande de tôle d'acier inoxydable à partir d'une bande de tôle élaborée à chaud, procédés ayant pour but l'obtention d'un tôle comportant un état de surface amélioré caractérisé, par exemple, par une rugosité Ra inférieure 0,25 micromètre.Various processes are known for producing a strip of stainless steel sheet from a strip of sheet produced hot, processes aimed at obtaining a sheet comprising an improved surface condition, characterized by example, with a roughness Ra of less than 0.25 micrometer.

Il est connu un procédé d'élaboration d'une bande de tôle d'acier inoxydable comprenant des opérations de recuit de la bande de tôle laminée à chaud, et de décapage de ladite bande, ces opérations étant effectuées sur une première ligne. Sur une seconde ligne, la bande de tôle décapée est soumise à une opération de laminage à froid sur un laminoir réversible, l'opération de laminage étant effectuée en cinq passes, et de manière générale, en sept passes ou plus, sous un taux de réduction pouvant varier de 50 à 80%. La bande de tôle ainsi laminée à froid est ensuite déplacée sur une ligne pour subir un recuit suivi d'un décapage. Enfin, la bande de tôle décapée est soumise à une opération de laminage à froid de type "skin pass" qui peut être suivi d'une opération de planage et de cisaillage.There is a known method of producing a strip of stainless steel sheet comprising operations of annealing the strip of hot-rolled sheet, and pickling of said strip, these operations being carried out on a first line. On a second line, the strip of pickled sheet is subjected to a cold rolling operation on a reversible rolling mill, the rolling operation being carried out in five passes, and generally, in seven passes or more, at a rate of reduction can vary from 50 to 80%. The sheet strip thus cold rolled is then moved on a line to undergo annealing followed by pickling. Finally, the strip of pickled sheet metal is subjected to a cold rolling operation of the "skin pass" type which can be followed by a planing and shearing operation.

L'inconvénient de ce procédé est dû notamment au grand nombre d'outils sur lesquels la bande de tôle élaborée à chaud doit être déplacée, avec pour conséquences des coûts de traitement d'entretien, de personnel, des manutentions intermédiaires nombreuses avec risques d'endommagement de la bande de tôle, des pertes de métal par chutage, des durées de traitement généralement supérieures à une semaine, voire deux semaines ou plus, dues aux attentes devant chacun des outils, attentes nécessitant des stocks, des surfaces de stockages, et des coûts de stockage correspondants.The disadvantage of this process is due in particular to the large number of tools on which the strip of hot-worked sheet must be moved, with the consequence of maintenance treatment costs, of personnel, numerous intermediate handling operations with risks of damage to the sheet metal strip, loss of metal by dropping, treatment times generally greater than a week, or even two weeks or more, due to the expectations in front of each tool, expectations requiring stocks, storage areas, and corresponding storage costs.

L'invention à pour but l'élaboration, en continu, d'une bande de tôle d'acier inoxydable présentant en surface une caractéristique déterminée en rugosité et en homogénéité d'aspect, bande de tôle obtenue sur une seule ligne industrielle, le procédé d'élaboration assurant une réduction conséquente du nombre de passes dans l'opération de laminage à froid, et permettant de réaliser économiquement l'ensemble des opérations nécessaires à l'obtention d'une bande de tôle présentant une qualité de surface définie.The object of the invention is to produce, continuously, a strip of stainless steel sheet having on the surface a characteristic determined in roughness and in uniformity of appearance, sheet strip obtained on a single industrial line, the process production ensuring a consequent reduction in the number of passes in the cold rolling operation, and making it possible to economically produce the whole operations necessary to obtain a sheet metal strip having a defined surface quality.

L'invention à pour objet un procédé d'élaboration sur une ligne, en continu, d'une bande de tôle laminée d'acier inoxydable présentant un état de surface amélioré qui se caractérise en ce que la tôle élaborée à chaud est soumise principalement à,

  • un planage sous traction produisant un allongement résiduel de 1 à 5%, pour fissurer la couche d'oxyde et planer la tôle,
  • un décapage primaire assurant le retrait de la calamine,
  • un laminage à froid en au plus trois passes de laminage,
  • un recuit final,
  • un décapage final,
  • un laminage à froid de type "skin pass".
The subject of the invention is a process for the production, on a continuous line, of a strip of laminated sheet steel of stainless steel having an improved surface condition which is characterized in that the sheet produced hot is mainly subjected to ,
  • a leveling under tension producing a residual elongation of 1 to 5%, to crack the oxide layer and level the sheet,
  • a primary pickling ensuring the removal of the scale,
  • cold rolling in at most three rolling passes,
  • final annealing,
  • a final stripping,
  • cold rolling of the skin pass type.

Les autres caractéristiques de l'invention sont:

  • la bande de tôle est, en outre, soumise à une abrasion pouvant être effectuée avant, et ou après, et ou pendant l'opération de décapage primaire,
  • l'abrasion est réalisée avec au moins une brosse,
  • la bande de tôle est, après le planage sous traction, soumise à un grenaillage pour décalaminage,
  • pour une bande de tôle d'acier ferritique, le laminage à froid de la bande est effectué sous un taux de réduction inférieur à 60%,
  • pour une bande de tôle d'acier austénitique, le laminage à froid de la bande est effectué sous un taux de réduction inférieur à 50%,
  • la bande de tôle est soumise à un recuit final effectué sous atmosphère oxydante à une température comprise entre 800 et 1200°C,
  • la bande de tôle, après laminage à froid et recuit final, est soumise à un laminage à froid de type "skin pass", le laminage à froid produisant un allongement de la bande compris entre 0,5 et 2%,
  • la bande de tôle est, en outre, après décapage final et laminage de type "skin pass", soumise à un planage,
  • la bande de tôle est en outre, soumise à une opération de cisaillage pour découpe des rives,
The other characteristics of the invention are:
  • the sheet metal strip is furthermore subjected to abrasion which can be carried out before, and or after, and or during the primary pickling operation,
  • the abrasion is carried out with at least one brush,
  • the sheet metal strip is, after planing under tension, subjected to a shot peening for descaling,
  • for a strip of ferritic steel sheet, the cold rolling of the strip is carried out at a reduction rate of less than 60%,
  • for a strip of austenitic steel sheet, the cold rolling of the strip is carried out under a reduction rate of less than 50%,
  • the sheet metal strip is subjected to a final annealing carried out under an oxidizing atmosphere at a temperature between 800 and 1200 ° C.,
  • the sheet metal strip, after cold rolling and final annealing, is subjected to a cold rolling of the "skin pass" type, cold rolling producing an elongation of the strip of between 0.5 and 2%,
  • the sheet metal strip is, after final pickling and rolling of the "skin pass" type, subjected to leveling,
  • the sheet metal strip is also subjected to a shearing operation for cutting the edges,

L'invention concerne également une ligne industrielle d'élaboration d'une bande de tôle d'acier inoxydable pour la mise en oeuvre du procédé caractérisée en ce qu'elle comprend successivement,

  • une planeuse sous traction,
  • une station de décapage primaire,
  • un dispositif de laminage à froid en continu, non réversible,
  • un dispositif de recuit final,
  • un dispositif de décapage final,
  • un dispositif de laminage à froid de type "skin pass".
The invention also relates to an industrial line for developing a strip of stainless steel sheet for the implementation of the method characterized in that it successively comprises,
  • a leveler under traction,
  • a primary pickling station,
  • a non-reversible continuous cold rolling device,
  • a final annealing device,
  • a final pickling device,
  • a "skin pass" type cold rolling device.

Les autres caractéristiques de la ligne sont:

  • la ligne comprend en outre une station de grenaillage,
  • la station de décapage primaire comprend un moyen assurant un arrêt, en ligne, du décapage de la bande de tôle,
  • la station de décapage comprend un bac d'un bain acide muni d'un dispositif de retrait de la bande de tôle en immersion,
  • la station de décapage est du type à aspersion,
  • la station de décapage est électrolytique,
  • la cuve de la station de décapage électrolytique contient un électrolyte choisi parmi, un sel neutre, de l'acide phosphorique,
  • la ligne comprend en outre un moyen d'abrasion pouvant être placé avant, et ou après la station de décapage, et ou dans la station de décapage primaire.
  • le moyen d'abrasion est une brosse .
  • le dispositif de laminage à froid est composé d'au plus trois cages de type multicylindres, les cylindres de travail ayant un diamètre inférieur à 180 mm et de préférence inférieur à 150 mm,
  • la ligne comprend en outre au moins une station de planage associée au dispositif de laminage à froid de type "skin pass",
  • la ligne comprend en outre au moins un dispositif de cisaillage des rives de bande.
The other characteristics of the line are:
  • the line also includes a blasting station,
  • the primary pickling station comprises means ensuring an on-line stop of the pickling of the sheet metal strip,
  • the pickling station comprises a tank of an acid bath provided with a device for removing the strip of sheet metal in immersion,
  • the pickling station is of the sprinkler type,
  • the pickling station is electrolytic,
  • the tank of the electrolytic pickling station contains an electrolyte chosen from, a neutral salt, phosphoric acid,
  • the line further comprises an abrasion means which can be placed before, and or after the pickling station, and or in the primary pickling station.
  • the means of abrasion is a brush.
  • the cold rolling device is composed of at most three multi-cylinder type cages, the working rolls having a diameter less than 180 mm and preferably less than 150 mm,
  • the line further comprises at least one leveling station associated with the "skin pass" type cold rolling device,
  • the line further comprises at least one device for shearing the strip edges.

La description qui suit et les figures annexées, le tout donné à titre d'exemple non limitatif fera bien comprendre l'invention.The following description and the appended figures, all given by way of nonlimiting example will make the invention better understood.

La figure 1 présente un schéma de principe matérialisant, dans une opération de laminage à froid, l'évolution de état de surface d'une bande de tôle, du point de vue rugosité, en fonction du nombre de passes et du taux de réduction du laminage à froid.FIG. 1 presents a diagram showing the principle, in a cold rolling operation, of the evolution of the surface condition of a strip of sheet metal, from the roughness point of view, as a function of the number of passes and the reduction rate of the cold rolling.

La figure 2 présente une courbe des forces de laminage en fonction du taux de réduction de laminage à froid pour deux qualités de l'huile de laminage utilisée.FIG. 2 shows a curve of the rolling forces as a function of the reduction rate of cold rolling for two qualities of the rolling oil used.

La figure 3 est un schéma de la ligne de laminage selon l'invention.Figure 3 is a diagram of the rolling line according to the invention.

La figure 4 est un autre schéma de la ligne de laminage selon l'invention.Figure 4 is another diagram of the rolling line according to the invention.

L'invention concerne un procédé d'élaboration, en ligne, en continu, d'une bande de tôle laminée d'acier inoxydable présentant un état de surface amélioré 2B caractérisé par une rugosité Ra inférieure à 0,25 micromètre, voire inférieure à 0,15 micromètre dans le sens long et dans le sens travers, le procédé ne générant pas de changement de teinte apparent, d'auréole ni de trace d'oxyde.The invention relates to a process for the production, on-line, continuously, of a strip of laminated stainless steel sheet having an improved surface condition 2B characterized by a roughness Ra of less than 0.25 micrometer, or even less than 0 , 15 micrometer in the long direction and in the cross direction, the process not generating a change of apparent color, aureole or trace of oxide.

Selon le procédé de l'invention, une bande de tôle élaborée à chaud est soumise, en premier lieu, à un planage sous traction. Le planage sous traction à pour fonction de provoquer, par la traction qui génère un allongement résiduel de 1 à 5% de la bande de tôle, un écaillage de la couche d'oxyde de ladite bande. Le planage associée à la traction assure, à ce stade du procédé, une amélioration de la planéité de la bande de tôle, amélioration qui influe sur les opérations qui suivent telles que le grenaillage. Après l'opération de planage sous traction, la bande de tôle est soumise à un décapage, qui assure, un état de surface amélioré de la bande de tôle, comparativement à une méthode classique d'élaboration d'une bande de tôle, comme décrit ci dessus, dans l'art antérieur.According to the method of the invention, a strip of sheet metal produced hot is subjected, first of all, to leveling under tension. The leveling under tension has the function of causing, by the traction which generates a residual elongation of 1 to 5% of the sheet metal strip, flaking of the oxide layer of said strip. The leveling associated with the traction ensures, at this stage of the process, an improvement in the flatness of the sheet metal strip, an improvement which influences the following operations such as shot blasting. After the planing operation under tension, the sheet metal strip is subjected to a pickling, which ensures an improved surface finish of the sheet metal strip, compared to a conventional method of producing a sheet metal strip, as described above, in the prior art.

Sur la figure 1, les courbes A et B présentent un schéma de principe matérialisant, dans une opération de laminage à froid, l'évolution de état de surface d'une bande de tôle, du point de vue rugosité, en fonction du nombre de passes et du taux de réduction. L'évolution de l'état de surface dans le procédé classique est référencé par la courbe A, celle de l'invention est référencé par la courbe B.In FIG. 1, curves A and B present a diagram showing the principle, in a cold rolling operation, of the evolution of the surface state of a strip of sheet metal, from the roughness point of view, as a function of the number of passes and reduction rate. The evolution of the surface condition in the conventional process is referenced by curve A, that of the invention is referenced by curve B.

Comme représenté sur les courbes A et B de la figure 1, la variation de la rugosité d'une bande de tôle est décroissante en fonction d'une part, du taux de réduction de la bande lors du laminage à froid et d'autre part, du nombre de passes dans le laminage à froid. Le nombre de passe est matérialisé sur les courbes A et B de la figure 1 par un chiffre contenu dans un cercle.As shown in curves A and B in FIG. 1, the variation in the roughness of a sheet strip decreases as a function on the one hand, of the reduction rate of the strip during cold rolling and on the other hand , the number of passes in cold rolling. The number of passes is shown on curves A and B in Figure 1 by a number contained in a circle.

Le procédé classique, dans lequel la bande de tôle a subit, avant laminage à froid, un recuit suivi d'un grenaillage et d'un décapage, permet d'obtenir une bande de tôle ayant une rugosité Rt de 25 à 40 micromètres et un Ra de 2,5 à 4 micromètres. Dans le procédé selon l'invention, la bande avant laminage à froid a une rugosité Rt de 10 à 20 micromètres et un Ra de 1 à 2 micromètres. La bande est de plus totalement exempte d'oxyde.The conventional method, in which the strip of sheet metal has undergone, before cold rolling, annealing followed by shot blasting and pickling, makes it possible to obtain a sheet strip having a roughness Rt of 25 to 40 micrometers and a Ra from 2.5 to 4 micrometers. In the process according to the invention, the strip before cold rolling has a roughness Rt of 10 to 20 micrometers and a Ra of 1 to 2 micrometers. The strip is also completely free of oxide.

De manière préférentielle, et dans le but de parfaire l'état de surface de la bande de tôle planée sous traction, la bande de tôle est soumise à une abrasion par exemple un brossage abrasif, le brossage étant effectué avant, après, ou pendant l'opération de décapage primaire.Preferably, and with the aim of perfecting the surface condition of the sheet strip planed under tension, the sheet strip is subjected to abrasion, for example abrasive brushing, brushing being carried out before, after, or during the primary pickling operation.

Egalement pour parfaire l'état de surface de la bande de tôle avant l'opération de laminage à froid et décapage, la bande de tôle peut être soumise à une opération de grenaillage qui facilite le décollement de la calamine sans pour autant perturber de manière excessive la surface de la tôle. En effet la bande de tôle élaborée à chaud et non recuite, possède des caractéristiques mécaniques élevées qui, associées à des conditions de grenaillage douces, permettent un grenaillage sans perturbation nuisible de la surface de la bande de tôle.Also to perfect the surface condition of the sheet metal strip before the cold rolling and pickling operation, the sheet metal strip may be subjected to a peening operation which facilitates the detachment of the scale without unduly disturbing it. the surface of the sheet. In fact, the strip of sheet metal produced hot and not annealed, has high mechanical characteristics which, associated with mild blasting conditions, allow blasting without harmful disturbance of the surface of the sheet strip.

Alors qu'il était reconnu que l'état de surface d'une bande de tôle était, en particulier, amélioré par le fait que la bande de tôle est soumise à un grand nombre de passes dans l'opération de laminage à froid, la demanderesse a remarqué que la qualité de l'état de surface de la bande de tôle, du point de vue rugosité, est dû, pour une grande part, à la qualité de l'état de surface de la bande de tôle avant l'opération de laminage à froid. Le laminage à froid malgré un grand nombre de passe n'efface que très progressivement la rugosité apparue lors du traitement de la bande de tôle avant le laminage à froid.While it was recognized that the surface condition of a sheet strip was, in particular, improved by the fact that the sheet strip was subjected to a large number of passes in the cold rolling operation, the Applicant has noticed that the quality of the surface condition of the sheet strip, from the roughness point of view, is due, to a large extent, to the quality of the surface condition of the sheet strip before the operation. cold rolling. Cold rolling despite a large number of passes only very gradually erases the roughness that appeared during the treatment of the sheet metal strip before cold rolling.

Selon l'invention, les opérations de planage sous traction et de décapage associées ont pour but d'assurer à la surface de la bande de tôle un état de rugosité tel qu'il permette de réduire de manière conséquente le nombre de passes dans l'opération de laminage à froid. Ceci est matérialisé par la courbe B de la figure 1. Selon l'invention, la réduction du nombre de passes dans le laminage à froid impose des conditions de laminage qui assure une réduction de la rugosité de la bande de tôle.According to the invention, the leveling operations under tension and associated stripping are intended to provide the surface of the sheet metal strip with a roughness state such that it makes it possible to reduce the number of passes in a substantial manner. cold rolling operation. This is shown by curve B in FIG. 1. According to the invention, the reduction in the number of passes in cold rolling imposes rolling conditions which ensure a reduction in the roughness of the sheet strip.

La réduction totale en épaisseur de la bande de tôle est optimisée pour ne pas dépasser une force de laminage de 800 tonnes par mètre largeur exercée sur les cylindres des laminoirs. Au delà de cette limite, il y a formation d'une couche de transfert épaisse et rugueuse sur les cylindres de travail, qui imprime la bande de tôle laminée pour lui conférer une rugosité élevée correspondant à un Ra d'environ 1 micromètre.The total reduction in thickness of the sheet metal strip is optimized so as not to exceed a rolling force of 800 tonnes per meter width exerted on the rolls of the rolling mills. Beyond this limit, a thick and rough transfer layer is formed on the working rolls, which prints the strip of laminated sheet metal to give it a high roughness corresponding to a Ra of around 1 micrometer.

Le diamètre des cylindres de laminoir est inférieur à 180 millimètres et de préférence inférieur à 150 millimètres pour permettre des réductions élevées d'épaisseur de bande avec des forces de laminage inférieures à 800 tonnes par mètre largeur.The diameter of the rolling mill rolls is less than 180 millimeters and preferably less than 150 millimeters to allow high reductions in strip thickness with rolling forces less than 800 tonnes per meter width.

De tels cylindres assurent une amélioration de la rugosité au cours du laminage à froid. Les cylindres de la dernière cage doivent être polis pour présenter une rugosité très faible et de préférence inférieure à 0,1 micromètre.
Pour parvenir à des réductions d'épaisseur de la bande de tôle avec des taux de réduction inférieurs à 60%, il est préférable d'utiliser des huiles de laminage paraffiniques contenant un ou des additifs réducteurs de frottement, les additifs étant de préférence un ou plusieurs esters dont la concentration totale dans l'huile est supérieure ou égale à 10%. Les huiles de laminage utilisées, permettent de réaliser les taux de réduction ci dessus en un nombre de passes encore plus réduites, deux passes par exemple, sans augmentation des forces de laminage. Par exemple, l'utilisation d'une huile paraffinique contenant au moins 10% d'ester permet, à effort de laminage identique, une réduction en épaisseur de la bande de tôle de 35% comparativement à, la réduction de 25% obtenue avec une huile classique ne contenant que 1% d'ester.Such cylinders provide an improvement in roughness during cold rolling. The cylinders of the last cage must be polished to have a very low roughness and preferably less than 0.1 micrometer.
To achieve reductions in sheet metal thickness with reduction rates of less than 60%, it is preferable to use paraffinic laminating oils containing one or more friction reducing additives, the additives being preferably one or more several esters whose total concentration in the oil is greater than or equal to 10%. The rolling oils used make it possible to achieve the above reduction rates in an even smaller number of passes, two passes for example, without increasing the rolling forces. For example, the use of a paraffinic oil containing at least 10% of ester allows, with identical rolling effort, a reduction in thickness of the sheet metal strip of 35% compared to, the reduction of 25% obtained with a conventional oil containing only 1% ester.

La figure 2 présente deux courbes a et b correspondant aux forces de laminage autorisées en fonction de différents taux de réduction de laminage pour deux concentrations en ester d'une huile de laminage.FIG. 2 shows two curves a and b corresponding to the rolling forces authorized as a function of different rolling reduction rates for two concentrations of ester of a rolling oil.

Pour parfaire l'état de surface de la bande de tôle élaborée à chaud planée sous traction, on soumet ladite bande à un brossage pouvant être abrasif, le brossage étant effectué avant, après ou pendant l'opération de décapage chimique.To improve the surface condition of the strip of sheet metal produced hot planed under tension, the strip is subjected to brushing which may be abrasive, brushing being carried out before, after or during the chemical pickling operation.

Dans le même but, la bande de tôle laminée à chaud planée sous traction, peut être, avant décapage et ou brossage, soumise à un grenaillage, facilitant le décollement de la calamine.For the same purpose, the strip of hot-rolled sheet metal planed under tension, can be, before pickling and or brushing, subjected to a peening, facilitating the detachment of the scale.

La bande de tôle élaborée par le procédé selon l'invention possède une qualité de surface correspondant à une rugosité Ra inférieure à 0,25 micromètre, pouvant atteindre une rugosité Ra inférieure à 0,15 micromètre.The sheet metal strip produced by the process according to the invention has a surface quality corresponding to a roughness Ra of less than 0.25 micrometers, which can reach a roughness Ra of less than 0.15 micrometers.

L'invention concerne également comme représentée sur la figure 3, une ligne 1 industrielle pour la mise en oeuvre du procédé, ligne 1 industrielle qui comprend de manière associée, une planeuse 2 sous traction, et une station de décapage primaire 3 , assurant un arrêt de l'opération de décapage en ligne simultanément à l'arrêt du dispositif de laminage à froid.The invention also relates, as shown in FIG. 3, to an industrial line 1 for implementing the process, an industrial line 1 which includes, in an associated manner, a leveler 2 under traction, and a primary pickling station 3, ensuring a stop of the online pickling operation simultaneously with the stopping of the cold rolling device.

De plus, une réduction très importante de la durée du traitement de décapage de l'acier est imposée pour éviter une accumulation de la bande entre les différents dispositifs de la ligne. Une telle ligne d'élaboration en continu a l'avantage de réduire la manutention intermédiaire et le stock.In addition, a very significant reduction in the duration of the pickling treatment of the steel is imposed in order to avoid an accumulation of the strip. between the different devices of the line. Such a continuous production line has the advantage of reducing intermediate handling and stock.

Dans le domaine du laminage à froid de bandes de tôle en acier inoxydable, le traitement des cylindres de travail du laminoir doit conférer auxdits cylindres une résistance à l'usure suffisante pour maintenir la qualité de leur surface pendant le laminage d'au moins une bande bobinée de 30 tonnes. Les cylindres utilisés sont en acier rapide sur-carburés au vanadium ou encore frittés, et doivent être changés pratiquement à chaque bobine laminée. ll s'en suit une nécessité d'arrêter la ligne de manière régulière, à chaque changement des cylindres de travail. L'usage d'un bain de décapage en amont du dispositif de laminage à froid pose le problème des arrêts fréquents du laminoir et du contrôle du temps de passage de la bande dans le bain de décapage. En effet, les différents arrêts de la bande de tôle sur une seule ligne impose une gestion de réserve de bande au moyen d'accumulateurs de bande placés entre les différentes stations et dispositifs.In the field of cold rolling of strips of stainless steel sheet, the treatment of the working rolls of the rolling mill must give said rolls sufficient wear resistance to maintain the quality of their surface during the rolling of at least one strip. wound up to 30 tonnes. The cylinders used are made of high-speed steel supercharged with vanadium or even sintered, and must be changed practically with each rolled coil. There follows a need to stop the line regularly, each time the working rolls are changed. The use of a pickling bath upstream of the cold rolling device poses the problem of frequent stops of the rolling mill and of controlling the time of passage of the strip in the pickling bath. Indeed, the different stops of the sheet metal strip on a single line requires management of the strip reserve by means of strip accumulators placed between the different stations and devices.

Selon l'invention, la station de décapage primaire 3 est suivie d'un dispositif de laminage à froid 4. La station de décapage 3 comprend un bac d'un bain acide muni d'un dispositif de retrait de la bande de tôle en immersion.According to the invention, the primary pickling station 3 is followed by a cold rolling device 4. The pickling station 3 comprises a tank of an acid bath provided with a device for removing the strip of sheet metal in immersion .

De préférence, et pour assurer les arrêts fréquents de la ligne, sans détérioration de la bande par une attaque chimique incontrôlée, la station de décapage 3 est du type à aspersion. La station de décapage par aspersion autorise un arrêt du décapage instantané par l'arrêt de l'aspersion simultanément à l'arrêt du laminoir.Preferably, and to ensure frequent stops of the line, without deterioration of the strip by an uncontrolled chemical attack, the pickling station 3 is of the spray type. The spray pickling station authorizes an instant pickling stop by stopping the spraying simultaneously with the stopping of the rolling mill.

Dans un autre exemple de réalisation, la station de décapage 3 primaire peut être une station de décapage électrolytique comportant une cuve par exemple de sel neutre, l'arrêt de la station étant effectué par arrêt de l'alimentation électrique de la cuve électrolytique.In another exemplary embodiment, the primary pickling station 3 may be an electrolytic pickling station comprising a tank, for example of neutral salt, the station being stopped by stopping the electrical supply to the electrolytic tank.

La station de décapage 3, muni d'un moyen d'arrêt du décapage, permet de réduire en volume ou de supprimer l'accumulateur de bande 13 placé généralement entre la station de décapage 3 et le dispositif de laminage à froid 4.The pickling station 3, provided with a pickling stop means, makes it possible to reduce the volume or to eliminate the strip accumulator 13 generally placed between the pickling station 3 and the cold rolling device 4.

La ligne 1 comporte, après le dispositif de laminage à froid 4 non réversible comprenant au plus trois cages 5, un dispositif de recuit 6 de la bande de tôle écrouie, une station de décapage final 7, et un dispositif de laminage à froid de type "skin pass" 8.Line 1 comprises, after the non-reversible cold rolling device 4 comprising at most three cages 5, an annealing device 6 for the work hardened sheet strip, a final pickling station 7, and a cold rolling device of the type "skin pass" 8.

La ligne 1 selon l'invention peut comporter également, placée après la planeuse sous traction 2, comme présenté sur la figure 4, une station de grenaillage 9 et ou un moyen de brossage 10 pouvant être abrasif, contribuant à affiner la qualité de la surface de la bande de tôle avant laminage à froid pour obtenir un état de surface amélioré de la bande de tôle après ledit laminage à froid réduit en nombre de passes.Line 1 according to the invention can also include, placed after the leveler under tension 2, as shown in FIG. 4, a blasting station 9 and or a brushing means 10 which can be abrasive, helping to refine the quality of the surface of the sheet metal strip before cold rolling to obtain an improved surface finish of the sheet metal strip after said cold rolling reduced in number of passes.

La ligne peut comporter en outre, après le dispositif de laminage à froid de type "skin pass", une planeuse 11 associée à une cisaille 12. Une seconde cisaille 12 peut être placée après la planeuse sous traction 2.The line can also comprise, after the cold rolling device of the "skin pass" type, a leveler 11 associated with a shear 12. A second shear 12 can be placed after the leveler under tension 2.

Dans un exemple de réalisation, une bande de tôle en acier austénitique laminée à chaud et présentant une épaisseur de 2 mm est soumise à un planage sous traction produisant un allongement résiduel de 3,5%.In an exemplary embodiment, a strip of hot-rolled austenitic steel sheet having a thickness of 2 mm is subjected to leveling under tension producing a residual elongation of 3.5%.

La bande de tôle est ensuite décapée dans deux bains acides H2SO4. A ce stade du procédé la bande de tôle présente une rugosité inférieure à 1,5 micromètre.The sheet metal strip is then pickled in two acid baths H 2 SO 4 . At this stage of the process, the sheet metal strip has a roughness of less than 1.5 micrometers.

La bande de tôle est ensuite soumise à un laminage à froid en trois passes sur un train de laminage à froid du type ZHi. La bande de tôle est laminée à froid sous un taux de réduction de 50%. La bande de tôle est ensuite recuite puis décapée. Elle présente, après ces courtes opérations de laminage à froid, recuit et décapage, une rugosité Ra inférieure à 0,25 micromètre. La bande de tôle est soumise à une opération, en une passe, de laminage à froid du type "skin pass" produisant un allongement de 0,8%. La bande de tôle présente alors une rugosité Ra inférieure à 0,1 micromètre.The sheet metal strip is then subjected to cold rolling in three passes on a ZHi type cold rolling train. The sheet metal strip is cold rolled at a reduction rate of 50%. The sheet metal strip is then annealed and pickled. After these short cold rolling, annealing and pickling operations, it has a roughness Ra of less than 0.25 micrometer. The sheet metal strip is subjected to a one-pass cold rolling operation of the "skin pass" type producing an elongation of 0.8%. The sheet metal strip then has a roughness Ra of less than 0.1 micrometer.

Dans un autre exemple de réalisation, une bande de tôle en acier ferritique stabilisé au titane, laminée à chaud et présentant une épaisseur de 3 mm est soumise à un planage sous traction produisant un allongement résiduel de 4%.In another exemplary embodiment, a strip of titanium-stabilized ferritic steel sheet, hot-rolled and having a thickness of 3 mm is subjected to leveling under tension producing a residual elongation of 4%.

La bande de tôle est ensuite décapée dans un bain acide H2SO4 puis dans un bain acide HNO3. A ce stade du procédé la bande de tôle présente une rugosité Ra inférieure à 2 micromètres.The sheet metal strip is then pickled in an acid bath H 2 SO 4 and then in an acid bath HNO 3 . At this stage of the process, the sheet metal strip has a roughness Ra of less than 2 micrometers.

La bande de tôle est ensuite soumise à un laminage à froid en deux passes sous un taux de réduction de 50% sur laminoirs du type ZHi puis recuite et décapée. Elle présente, après ces courtes opérations de laminage à froid, recuit et décapage, une rugosité Ra inférieure à 0,25 micromètre. La bande de tôle est soumise ensuite à une opération de laminage à froid en une passe du type "skin pass" produisant un allongement de la bande de 0,8%. La bande de tôle présente alors une rugosité inférieure à 0,15 micromètre.The sheet metal strip is then subjected to a cold rolling in two passes at a reduction rate of 50% on rolling mills of the ZHi type, then annealed and pickled. After these short cold rolling, annealing and pickling operations, it has a roughness Ra of less than 0.25 micrometer. The sheet metal strip is then subjected to a cold rolling operation in a pass of the "skin pass" type producing a band extension of 0.8%. The sheet metal strip then has a roughness of less than 0.15 micrometers.

Se pose, sur cette ligne, le problème du décapage et en particulier d'un décapage en un temps imposé court, pour éviter, de manière impérative, une accumulation de la bande traitée entre les différents dispositifs enchaînés à la ligne de production de la bande.On this line, there is the problem of pickling and in particular pickling in a short imposed time, to avoid, imperatively, an accumulation of the treated strip between the various devices chained to the strip production line .

Dans un autre exemple, la bande de tôle en acier inoxydable est décapée par une solution aqueuse de décapage constituée d'acide chlorhydrique, d'ions ferriques et ferreux de décapage en solution, et, en vue de conserver un pouvoir décapant constant de la solution aqueuse d'acide chlohydrique à maintenir la concentration en ions Fe3+, par réoxydation des ions Fe2+ générés lors du décapage, le potentiel REDOX étant maintenu à une valeur comprise entre 0 et 800 mV, potentiel mesuré entre une électrode de platine et une électrode de référence Ag/agCl placées dans la solution.In another example, the strip of stainless steel sheet is pickled with an aqueous pickling solution consisting of hydrochloric acid, ferric and ferrous pickling ions in solution, and, in order to maintain a constant pickling power of the solution aqueous hydrochloric acid to maintain the concentration of Fe 3+ ions, by reoxidation of the Fe 2+ ions generated during pickling, the REDOX potential being maintained at a value between 0 and 800 mV, potential measured between a platinum electrode and an Ag / agCl reference electrode placed in the solution.

Les opérations de décapage avant laminage, en ligne continue, assurent une qualité optimale de l'état de surface de la bande. L'efficacité du décapage peut permettre, en fonction de la qualité de la bande de tôle, la suppression des traitements mécaniques du type planage sous traction, grenaillage, brossage, réduisant de manière conséquente la ligne industrielle d'élaboration de la bande de tôle d'acier.The pickling operations before rolling, in a continuous line, ensure optimum quality of the surface condition of the strip. The effectiveness of pickling can allow, depending on the quality of the sheet metal strip, the elimination of mechanical treatments of the leveling type under tension, shot blasting, brushing, significantly reducing the industrial line of production of sheet metal strip d 'steel.

Selon le procédé de l'invention, la réduction du nombre de passes dans le laminage à froid permet la mise en place d'une ligne en continu comprenant un dispositif de laminage à froid réduit générant une économie sur investissement, pour l'obtention d'une tôle de qualité, et également, une économie importante sur les coûts d'entretien de la ligne et du personnel. La ligne en continu génère ainsi une réduction très importante de la durée du traitement, donc des stocks de produits semi-ouvrés et une suppression des manutentions intermédiaires génératrices de défauts et de perte de métal.According to the method of the invention, the reduction in the number of passes in cold rolling allows the establishment of a continuous line comprising a reduced cold rolling device generating an economy on investment, for obtaining a quality sheet, and also, a significant saving on the maintenance costs of the line and the personnel. The continuous line thus generates a very significant reduction in the duration of the treatment, therefore in stocks of semi-finished products and a elimination of intermediate handling generating defects and loss of metal.

Claims (22)

Procédé d'élaboration sur une ligne, en continu, d'une bande de tôle laminée d'acier inoxydable présentant un état de surface amélioré caractérisé en ce que la tôle élaborée à chaud,est soumise principalement à : - un planage sous traction produisant un allongement résiduel de 1 à 5%, pour fissurer la couche d'oxyde et planer la tôle, - un décapage primaire assurant le retrait de la calamine, - un laminage à froid en au plus trois passes de laminage, - un recuit final, - un décapage final, - un laminage à froid de type "skin pass". Process for the production on a line, continuously, of a strip of laminated sheet steel of stainless steel having an improved surface condition, characterized in that the sheet produced hot is mainly subjected to: - a leveling under tension producing a residual elongation of 1 to 5%, to crack the oxide layer and level the sheet, - a primary pickling ensuring the removal of the scale, - cold rolling in at most three rolling passes, - final annealing, - a final pickling, - cold rolling of the "skin pass" type. Procédé selon la revendication 1 caractérisé en ce que la bande de tôle est, en outre, soumise à une abrasion pouvant être effectuée avant, et ou après, et ou pendant l'opération de décapage primaire.A method according to claim 1 characterized in that the sheet metal strip is further subjected to abrasion which can be carried out before, and or after, and or during the primary pickling operation. Procédé selon la revendication 2 caractérisé en ce que l'abrasion est réalisée avec au moins une brosse.Method according to Claim 2, characterized in that the abrasion is carried out with at least one brush. Procédé selon les revendications 1 à 3 caractérisé en ce que la bande de tôle est, après le planage sous traction, soumise à un grenaillage pour décalaminage.Process according to Claims 1 to 3, characterized in that the strip of sheet metal is, after planing under tension, subjected to a blasting for descaling. Procédé selon les revendications 1 à 4 caractérisé en ce que pour une bande de tôle d'acier ferritique, le laminage à froid de la bande est effectué sous un taux de réduction inférieur ou égal à 60%.Process according to Claims 1 to 4, characterized in that for a strip of ferritic steel sheet, the cold rolling of the strip is carried out at a reduction rate less than or equal to 60%. Procédé selon les revendications 1 à 4 caractérisé en ce que pour une bande de tôle d'acier austénitique, le laminage à froid de la bande est effectué sous un taux de réduction inférieur ou égal à 50%.Process according to Claims 1 to 4, characterized in that for a strip of austenitic steel sheet, the cold rolling of the strip is carried out under a reduction rate less than or equal to 50%. Procédé selon les revendications 1 à 6 caractérisé en ce que la bande de tôle est soumise à un recuit final effectué sous atmosphère oxydante à une température comprise entre 800 et 1200°C.Process according to Claims 1 to 6, characterized in that the sheet metal strip is subjected to a final annealing carried out under an oxidizing atmosphere at a temperature between 800 and 1200 ° C. Procédé selon les revendications 1 à 7 caractérisé en ce que la bande de tôle, après laminage à froid et recuit final, est soumise à un laminage à froid de type "skin pass", le laminage à froid produisant un allongement de la bande compris entre 0,5 et 2%.Process according to Claims 1 to 7, characterized in that the strip of sheet metal, after cold rolling and final annealing, is subjected to cold rolling of the "skin pass" type, the cold rolling producing an elongation of the strip between 0.5 and 2%. Procédé selon les revendications 1 à 8 caractérisé en ce que la bande de tôle est, en outre, après décapage final et laminage de type "skin pass", soumise à un planage.Process according to Claims 1 to 8, characterized in that the sheet metal strip is, after final pickling and rolling of the "skin pass" type, subjected to leveling. Procédé selon les revendications 1 à 9 caractérisé en ce que la bande de tôle est en outre, soumise à une opération de cisaillage pour découpe des rives.Method according to Claims 1 to 9, characterized in that the sheet metal strip is further subjected to a shearing operation for cutting the edges. Ligne industrielle d'élaboration d'une bande de tôle d'acier inoxydable pour la mise en oeuvre du procédé selon les revendications de 1 à 10 caractérisée en ce qu'elle comprend successivement : - une planeuse sous traction, - une station de décapage primaire, - un dispositif de laminage à froid en continu, non réversible, - un dispositif de recuit final, - un dispositif de décapage final, - un dispositif de laminage à froid de type "skin pass". Industrial line for developing a strip of stainless steel sheet for the implementation of the method according to claims 1 to 10, characterized in that it successively comprises: - a leveler under traction, - a primary pickling station, - a non-reversible continuous cold rolling device, - a final annealing device, - a final pickling device, - a cold rolling device of the "skin pass" type. Ligne selon la revendication 11 caractérisée en ce qu'elle comprend en outre une station de grenaillage.Line according to claim 11 characterized in that it further comprises a blasting station. Ligne selon les revendications 11 et 12 caractérisée en ce que la station de décapage primaire comprend un moyen assurant un arrêt, en ligne, du décapage de la bande de tôle.Line according to claims 11 and 12 characterized in that the primary pickling station comprises means ensuring an on-line stop of the pickling of the sheet metal strip. Ligne selon les revendications 11 et 13 caractérisée en ce que la station de décapage comprend un bac d'un bain acide muni d'un dispositif de retrait de la bande de tôle en immersion.Line according to claims 11 and 13 characterized in that the pickling station comprises a tank of an acid bath provided with a device for removing the strip of sheet metal in immersion. Ligne selon les revendications 11 et 13 caractérisée en ce que la station de décapage est du type à aspersion.Line according to claims 11 and 13 characterized in that the pickling station is of the spray type. Ligne selon les revendications 11 et 13 caractérisée en ce que la station de décapage est électrolytique.Line according to claims 11 and 13 characterized in that the pickling station is electrolytic. Ligne selon la revendication 16 caractérisée en ce que la cuve de la station de décapage électrolytique contient un électrolyte choisi parmi, un sel neutre, de l'acide phosphorique.Line according to claim 16 characterized in that the tank of the electrolytic pickling station contains an electrolyte chosen from, a neutral salt, phosphoric acid. Ligne selon les revendications 11 à 17 caractérisée en ce que la ligne comprend en outre un moyen d'abrasion pouvant être placé avant, et ou après la station de décapage, et ou dans la station de décapage primaire.Line according to claims 11 to 17 characterized in that the line further comprises an abrasion means which can be placed before, and or after the pickling station, and or in the primary pickling station. Ligne selon la revendication 18 caractérisée en ce que le moyen d'abrasion est une brosse .Line according to claim 18 characterized in that the abrasion means is a brush. Ligne selon les revendications 11 à 19 caractérisée en ce que le dispositif de laminage à froid est composé d'au plus trois cages de type multicylindres, les cylindres de travail ayant un diamètre inférieur à 180 mm et de préférence inférieur à 150 mm.Line according to claims 11 to 19 characterized in that the cold rolling device is composed of at most three cages of the multi-cylinder type, the working rolls having a diameter less than 180 mm and preferably less than 150 mm. Ligne selon les revendications 11 à 20 caractérisée en ce que la ligne comprend en outre au moins une station de planage associée au dispositif de laminage à froid de type "skin pass".Line according to claims 11 to 20 characterized in that the line further comprises at least one leveling station associated with the cold rolling device of the "skin pass" type. Ligne selon les revendications 11 à 21 caractérisée en ce que la ligne comprend en outre au moins un dispositif de cisaillage des rives de bande.Line according to claims 11 to 21 characterized in that the line further comprises at least one device for shearing the strip edges.
EP96402086A 1995-10-19 1996-10-01 Method for continuously producing, in a line, rolled sheet metal strip of stainless steel with improved surface condition Revoked EP0769333B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9512271A FR2740061B1 (en) 1995-10-19 1995-10-19 PROCESS FOR THE CONTINUOUS DEVELOPMENT OF A STRIP OF LAMINATED SHEET OF STAINLESS STEEL HAVING AN IMPROVED SURFACE CONDITION
FR9512271 1995-10-19

Publications (2)

Publication Number Publication Date
EP0769333A1 true EP0769333A1 (en) 1997-04-23
EP0769333B1 EP0769333B1 (en) 2002-01-09

Family

ID=9483685

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96402086A Revoked EP0769333B1 (en) 1995-10-19 1996-10-01 Method for continuously producing, in a line, rolled sheet metal strip of stainless steel with improved surface condition

Country Status (16)

Country Link
US (1) US5820704A (en)
EP (1) EP0769333B1 (en)
JP (1) JP3888396B2 (en)
KR (1) KR100395288B1 (en)
CN (1) CN1065458C (en)
AT (1) ATE211662T1 (en)
AU (1) AU716533B2 (en)
BR (1) BR9605201A (en)
CA (1) CA2188315C (en)
DE (1) DE69618414T2 (en)
DK (1) DK0769333T3 (en)
ES (1) ES2170214T3 (en)
FR (1) FR2740061B1 (en)
PT (1) PT769333E (en)
TW (1) TW438635B (en)
ZA (1) ZA968722B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0927603A1 (en) * 1997-10-04 1999-07-07 Klaus Bodo Meier Method and installation for producing a matt surface on stainless steel sheet
EP0951954A1 (en) * 1998-04-23 1999-10-27 Ugine S.A. Stainless steel usable in storage containers, especially wine storage containers
FR2792857A1 (en) * 1999-04-28 2000-11-03 Kvaerner Metals Clecim PROCESS FOR THE CONTINUOUS MANUFACTURE OF A METAL STRIP
FR2942978A1 (en) * 2009-03-16 2010-09-17 Fives Dms Stainless steel strip producing method, involves annealing hard strip, subjecting annealed strip to pickling for removing carbon deposit, and subjecting strip to skin pass type superficial cold rolling
WO2012004205A1 (en) * 2010-07-09 2012-01-12 Andritz Sundwig Gmbh Method and production line for producing a cold rolled flat steel product from a rustproof steel
CN105132819A (en) * 2015-08-13 2015-12-09 山西太钢不锈钢股份有限公司 Continuous rolling method of low-chromium ferrite stainless steel

Families Citing this family (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1159091B1 (en) * 1998-12-18 2006-03-08 Outokumpu Stainless AB Method for manufacturing of strips and rolling mill line
US6088895A (en) * 1999-01-21 2000-07-18 Armco Inc. Method for descaling hot rolled strip
JP2001020045A (en) * 1999-07-07 2001-01-23 Nippon Steel Corp Stainless steel sheet stock and its production
AT408451B (en) 1999-11-18 2001-12-27 Andritz Ag Maschf METHOD FOR PRODUCING STAINLESS STEEL TAPES WITH IMPROVED SURFACE PROPERTIES
US6205830B1 (en) * 2000-02-24 2001-03-27 The Material Works, Ltd. Method and apparatus for processing sheet metal
FR2807957B1 (en) 2000-04-21 2002-08-02 Vai Clecim METHOD AND INSTALLATION FOR COLD ROLLING
KR20020014878A (en) * 2000-08-19 2002-02-27 이구택 Manufacturing method of high cleanness and full hardening cold rolled steel sheet
US6732561B2 (en) 2002-09-23 2004-05-11 The Material Works, Ltd. Method and apparatus for leveling and conditioning sheet metal
US6814815B2 (en) * 2003-04-07 2004-11-09 The Material Works, Ltd. Method of removing scale and inhibiting oxidation in processed sheet metal
US6814089B1 (en) 2003-06-03 2004-11-09 The Material Works, Ltd. Conditioning liquid cleaning and recycling system for sheet metal conditioning apparatus
CN1301159C (en) * 2003-09-23 2007-02-21 东北大学 Stainless steel abnormal shaped bar material for strip screen and preparation method
JP4788861B2 (en) * 2003-11-28 2011-10-05 ヤマハ株式会社 Steel wire for musical instrument string and method for manufacturing the same
FR2867991B1 (en) * 2004-03-25 2007-05-04 Ugine Et Alz France Sa AUSTENITIC STAINLESS STEEL STRIP BANDS MATT SURFACE
US20070044531A1 (en) * 2005-08-31 2007-03-01 Red Bud Industries, Inc. Method and apparatus for conditioning sheet metal
US8152687B2 (en) * 2007-01-24 2012-04-10 Torotrack (Development) Limited Powdered metal variator components
ES2384734T3 (en) * 2007-12-05 2012-07-11 Yieh United Steel Corp. Method for continuously manufacturing cold rolled steel
KR101053414B1 (en) 2008-07-04 2011-08-01 주식회사 포스코 Descaling method and removal equipment of hot rolled steel strip
CN101424595B (en) * 2008-12-11 2010-09-15 湖州职业技术学院 Spinneret orifice positioning and comprehensive detecting experimental apparatus for stainless steel wire rod production line
US20140060428A1 (en) * 2011-03-01 2014-03-06 Nippon Steel & Sumitomo Metal Corporation Metal plate for laser processing and method for producing stainless steel plate for laser processing
CN102310314B (en) * 2011-07-01 2013-03-20 云南钛业股份有限公司 Processing method of titanium and titanium alloy strip coils
CN103537880B (en) * 2012-07-17 2016-03-30 宝山钢铁股份有限公司 A kind of welding method of laser welder high-strength steel
CN103394865A (en) * 2013-07-25 2013-11-20 太原科技大学 Metal clad plate rolling technology capable of making blanks quickly
CN103862242B (en) * 2014-03-24 2016-05-18 无锡宝顺不锈钢有限公司 Manufacture the production method of accurate 317L stainless steel band capillaceous
CN103920710B (en) * 2014-03-27 2016-06-01 中冶南方工程技术有限公司 A kind of anti-corrosion cold-rolled products production method of low consumption
CN103949853B (en) * 2014-04-21 2016-08-31 西部超导材料科技股份有限公司 A kind of processing method of body implant titanium alloy arc
US10022760B2 (en) * 2015-10-02 2018-07-17 The Material Works, Ltd. Cut-to-length steel coil processing line with stretcher leveler and temper mill
WO2018073115A1 (en) * 2016-10-17 2018-04-26 Tata Steel Ijmuiden B.V. Steel for painted parts
WO2018073117A1 (en) * 2016-10-17 2018-04-26 Tata Steel Ijmuiden B.V. Steel substrate for painted parts
JP2019034325A (en) * 2017-08-21 2019-03-07 Ｊｆｅスチール株式会社 Method for manufacturing ferritic stainless cold-rolled steel strip
US20190105720A1 (en) * 2017-10-05 2019-04-11 Honeywell International Inc. System and method for trim loss optimization for metal industries
CN108405608A (en) * 2018-02-08 2018-08-17 中冶南方工程技术有限公司 A kind of stainless-steel cold-rolling production unit and its production method
CN112605561A (en) * 2020-11-30 2021-04-06 江苏优轧机械有限公司 Copper strips rolling device with polishing subassembly
CN113732086A (en) * 2021-10-09 2021-12-03 北京京诚之星科技开发有限公司 Push-pull and continuous dual-purpose strip steel surface cleaning production line and cleaning method thereof
CN114182079B (en) * 2021-11-18 2024-04-16 山东钢铁集团日照有限公司 Control method for surface rolling lines of cold-rolled deep-drawing steel for outer plate
CN115044912B (en) * 2022-05-17 2024-07-05 天津太钢天管不锈钢有限公司 Manufacturing method of high-roughness high-strength stainless steel for building

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2246321A1 (en) * 1973-10-08 1975-05-02 Bwg Bergwerk Walzwerk
JPS53122628A (en) * 1977-03-31 1978-10-26 Nisshin Steel Co Ltd Preparation of cold rolling thin steel plate or steel band of stainless steel with excellent buffing polishing property
JPS56127777A (en) * 1980-03-12 1981-10-06 Nippon Kokan Kk <Nkk> Descaling method for steel member
US4609594A (en) * 1983-07-19 1986-09-02 Nippon Steel Corporation Process for producing cold rolled steel strip highly susceptible to conversion treatment and product thereof
EP0195385A2 (en) * 1985-03-15 1986-09-24 Nippon Steel Corporation Method and apparatus for manufacturing cold-rolled steel strip
US5197179A (en) * 1991-04-18 1993-03-30 T. Sendzimir, Inc. Means and a method of improving the quality of cold rolled stainless steel strip
JPH05212410A (en) * 1992-02-07 1993-08-24 Nisshin Steel Co Ltd Cold-rolling equipment arranged successively after one series of continuous annealing and descaling device for stainless steel strip
EP0644276A1 (en) * 1993-09-17 1995-03-22 Hitachi, Ltd. A hot-rolled steel strip manufacturing and descaling method and an apparatus thereof
EP0695808A1 (en) * 1994-07-07 1996-02-07 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh Method of producing cold-rolled metallic strips, in particular strips of stainless steel and of titanium alloys
EP0706840A2 (en) * 1994-10-14 1996-04-17 MANNESMANN Aktiengesellschaft Method and device for manufacturing cold rolled stainless steel from hot rolled strip
EP0723024A1 (en) * 1994-12-22 1996-07-24 SUNDWIGER EISENHÜTTE MASCHINENFABRIK GmbH &amp; CO. Process and a continuous process line for producing cold-rolled steel strip

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5871336A (en) * 1981-10-21 1983-04-28 Nisshin Steel Co Ltd Production of high-strength austenitic stainless steel plate having excellent fatigue characteristic
JPS62253732A (en) * 1986-04-28 1987-11-05 Nippon Steel Corp Production of austenitic stainless steel strip and sheet having excellent polishability
JPH0788534B2 (en) * 1989-04-05 1995-09-27 新日本製鐵株式会社 Method for producing Cr-Ni type stainless steel thin plate with excellent surface quality
JPH0757363B2 (en) * 1990-03-12 1995-06-21 川崎製鉄株式会社 Method for producing stainless cold-rolled steel strip

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2246321A1 (en) * 1973-10-08 1975-05-02 Bwg Bergwerk Walzwerk
JPS53122628A (en) * 1977-03-31 1978-10-26 Nisshin Steel Co Ltd Preparation of cold rolling thin steel plate or steel band of stainless steel with excellent buffing polishing property
JPS56127777A (en) * 1980-03-12 1981-10-06 Nippon Kokan Kk <Nkk> Descaling method for steel member
US4609594A (en) * 1983-07-19 1986-09-02 Nippon Steel Corporation Process for producing cold rolled steel strip highly susceptible to conversion treatment and product thereof
EP0195385A2 (en) * 1985-03-15 1986-09-24 Nippon Steel Corporation Method and apparatus for manufacturing cold-rolled steel strip
US5197179A (en) * 1991-04-18 1993-03-30 T. Sendzimir, Inc. Means and a method of improving the quality of cold rolled stainless steel strip
JPH05212410A (en) * 1992-02-07 1993-08-24 Nisshin Steel Co Ltd Cold-rolling equipment arranged successively after one series of continuous annealing and descaling device for stainless steel strip
EP0644276A1 (en) * 1993-09-17 1995-03-22 Hitachi, Ltd. A hot-rolled steel strip manufacturing and descaling method and an apparatus thereof
EP0695808A1 (en) * 1994-07-07 1996-02-07 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh Method of producing cold-rolled metallic strips, in particular strips of stainless steel and of titanium alloys
EP0706840A2 (en) * 1994-10-14 1996-04-17 MANNESMANN Aktiengesellschaft Method and device for manufacturing cold rolled stainless steel from hot rolled strip
EP0723024A1 (en) * 1994-12-22 1996-07-24 SUNDWIGER EISENHÜTTE MASCHINENFABRIK GmbH &amp; CO. Process and a continuous process line for producing cold-rolled steel strip

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
BOUTEILLE J L ET AL: "L'USINE A FROID DE DEMAIN", CAHIERS D'INFORMATIONS TECHNIQUES DE LA REVUE DE METALLURGIE, vol. 87, no. 1, 1 January 1990 (1990-01-01), pages 89 - 95, XP000126499 *
DATABASE WPI Section Ch Week 7848, Derwent World Patents Index; Class M21, AN 78-86872A [48], XP002009228 *
PATENT ABSTRACTS OF JAPAN vol. 006, no. 003 (C - 086) 9 January 1982 (1982-01-09) *
PATENT ABSTRACTS OF JAPAN vol. 017, no. 651 (M - 1519) 3 December 1993 (1993-12-03) *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0927603A1 (en) * 1997-10-04 1999-07-07 Klaus Bodo Meier Method and installation for producing a matt surface on stainless steel sheet
EP0951954A1 (en) * 1998-04-23 1999-10-27 Ugine S.A. Stainless steel usable in storage containers, especially wine storage containers
FR2792857A1 (en) * 1999-04-28 2000-11-03 Kvaerner Metals Clecim PROCESS FOR THE CONTINUOUS MANUFACTURE OF A METAL STRIP
WO2000066287A1 (en) * 1999-04-28 2000-11-09 Vai Clecim Method for the continuous production of a metal strip
US6463777B1 (en) 1999-04-28 2002-10-15 Vai Clecim Method for the continuous production of a metal strip
FR2942978A1 (en) * 2009-03-16 2010-09-17 Fives Dms Stainless steel strip producing method, involves annealing hard strip, subjecting annealed strip to pickling for removing carbon deposit, and subjecting strip to skin pass type superficial cold rolling
CN101844151A (en) * 2009-03-16 2010-09-29 菲弗斯Dms股份有限公司 The production equipment of stainless steel strip and discontinuous production method thereof
CN101844151B (en) * 2009-03-16 2013-10-23 菲弗斯Dms股份有限公司 Stainless steel strip production equipment and discontinuous production method
WO2012004205A1 (en) * 2010-07-09 2012-01-12 Andritz Sundwig Gmbh Method and production line for producing a cold rolled flat steel product from a rustproof steel
CN105132819A (en) * 2015-08-13 2015-12-09 山西太钢不锈钢股份有限公司 Continuous rolling method of low-chromium ferrite stainless steel
CN105132819B (en) * 2015-08-13 2016-11-30 山西太钢不锈钢股份有限公司 A kind of method of low chrome ferritic stainless steel continuous rolling

Also Published As

Publication number Publication date
CN1156065A (en) 1997-08-06
KR100395288B1 (en) 2003-12-24
MX9604877A (en) 1997-10-31
JP3888396B2 (en) 2007-02-28
JPH09122710A (en) 1997-05-13
ATE211662T1 (en) 2002-01-15
US5820704A (en) 1998-10-13
DK0769333T3 (en) 2002-04-22
ES2170214T3 (en) 2002-08-01
EP0769333B1 (en) 2002-01-09
DE69618414T2 (en) 2002-08-29
FR2740061B1 (en) 1997-11-28
TW438635B (en) 2001-06-07
DE69618414D1 (en) 2002-02-14
AU716533B2 (en) 2000-02-24
CA2188315C (en) 2004-09-14
ZA968722B (en) 1998-04-16
KR970020236A (en) 1997-05-28
CN1065458C (en) 2001-05-09
PT769333E (en) 2002-06-28
FR2740061A1 (en) 1997-04-25
BR9605201A (en) 1998-07-21
AU7031196A (en) 1997-04-24
CA2188315A1 (en) 1997-04-20

Similar Documents

Publication Publication Date Title
EP0769333B1 (en) Method for continuously producing, in a line, rolled sheet metal strip of stainless steel with improved surface condition
US8057604B2 (en) Method and device for descaling metal strip
EP0792949B1 (en) Process for pickling a steel workpiece, in particular stainless steel sheet strip
JPH0610172A (en) Treatment of hot finished austenitic stainless steel strip
JP4221984B2 (en) Martensitic stainless steel cold rolled-annealed-pickled steel strip with extremely good surface gloss
JP3370618B2 (en) Pickling method for stainless steel cold rolled steel strip
US9487882B2 (en) Titanium material and method for producing titanium material
FR2942978A1 (en) Stainless steel strip producing method, involves annealing hard strip, subjecting annealed strip to pickling for removing carbon deposit, and subjecting strip to skin pass type superficial cold rolling
JP4604327B2 (en) Cold rolling method of raw steel sheet for hot metal plating and manufacturing method of alloyed hot metal plating steel sheet
RU2456376C2 (en) Method of combined electric-arc treatment of metal wire or strip and device for its implementation
JPH07266207A (en) Processing method and processing device line for stainless steel band
MXPA96004877A (en) Process of continuous elaboration of a laminated sheet of stainless steel, and continuous line for the use of proc
JP2937005B2 (en) Method for producing cold rolled steel sheet excellent in chemical conversion treatment and continuous annealing apparatus
JPH068118A (en) Processing method and processing device for beltlike metal body
JPH0517827A (en) Annealing and descaling method for stainless steel strip
JP2000288619A (en) Production of austenitic stainless steel having good buffability
JPH03207518A (en) Descaling method for hot rolled steel strip
JPH0679338A (en) Method and line of devices for processing belt-like metallic body
JPH07122101B2 (en) Manufacturing method of stainless steel strip
JPS60257905A (en) Production of cold rolled steel sheet
JP2004001001A (en) Tandem cold rolling mill and cold rolling method for extremely thin steel sheet using the same
JPH09296285A (en) Method for pickling austenitic stainless hot rolled steel strip
JPH05295573A (en) High speed pickling method for steel metal
JPH11319932A (en) Method for descaling hot rolled strip
JPS62124017A (en) Descaling method for hot rolled steel plate

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU NL PT SE

17P Request for examination filed

Effective date: 19970303

17Q First examination report despatched

Effective date: 19981103

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: UGINE S.A.

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU NL PT SE

REF Corresponds to:

Ref document number: 211662

Country of ref document: AT

Date of ref document: 20020115

Kind code of ref document: T

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: FRENCH

REF Corresponds to:

Ref document number: 69618414

Country of ref document: DE

Date of ref document: 20020214

REG Reference to a national code

Ref country code: DK

Ref legal event code: T3

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20020410

REG Reference to a national code

Ref country code: PT

Ref legal event code: SC4A

Free format text: AVAILABILITY OF NATIONAL TRANSLATION

Effective date: 20020321

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2170214

Country of ref document: ES

Kind code of ref document: T3

REG Reference to a national code

Ref country code: GR

Ref legal event code: EP

Ref document number: 20020401356

Country of ref document: GR

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

PLBQ Unpublished change to opponent data

Free format text: ORIGINAL CODE: EPIDOS OPPO

26 Opposition filed

Opponent name: BWG BERGWERK- UND WALZWERK-MASCHINENBAU GMBH

Effective date: 20021004

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

NLR1 Nl: opposition has been filed with the epo

Opponent name: BWG BERGWERK- UND WALZWERK-MASCHINENBAU GMBH

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

RDAF Communication despatched that patent is revoked

Free format text: ORIGINAL CODE: EPIDOSNREV1

APBP Date of receipt of notice of appeal recorded

Free format text: ORIGINAL CODE: EPIDOSNNOA2O

APBQ Date of receipt of statement of grounds of appeal recorded

Free format text: ORIGINAL CODE: EPIDOSNNOA3O

APAA Appeal reference recorded

Free format text: ORIGINAL CODE: EPIDOS REFN

APAH Appeal reference modified

Free format text: ORIGINAL CODE: EPIDOSCREFNO

PLAB Opposition data, opponent's data or that of the opponent's representative modified

Free format text: ORIGINAL CODE: 0009299OPPO

R26 Opposition filed (corrected)

Opponent name: BWG BERGWERK- UND WALZWERK-MASCHINENBAU GMBH

Effective date: 20021004

NLR1 Nl: opposition has been filed with the epo

Opponent name: BWG BERGWERK- UND WALZWERK-MASCHINENBAU GMBH

APAH Appeal reference modified

Free format text: ORIGINAL CODE: EPIDOSCREFNO

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20070927

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20070926

Year of fee payment: 12

APBU Appeal procedure closed

Free format text: ORIGINAL CODE: EPIDOSNNOA9O

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20071003

Year of fee payment: 12

Ref country code: LU

Payment date: 20071001

Year of fee payment: 12

Ref country code: ES

Payment date: 20071120

Year of fee payment: 12

Ref country code: DK

Payment date: 20071015

Year of fee payment: 12

Ref country code: DE

Payment date: 20070927

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20071011

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20071004

Year of fee payment: 12

Ref country code: BE

Payment date: 20071220

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20071009

Year of fee payment: 12

RDAG Patent revoked

Free format text: ORIGINAL CODE: 0009271

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT REVOKED

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GR

Payment date: 20070913

Year of fee payment: 12

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

27W Patent revoked

Effective date: 20080129

GBPR Gb: patent revoked under art. 102 of the ep convention designating the uk as contracting state

Effective date: 20080129

REG Reference to a national code

Ref country code: PT

Ref legal event code: MP4A

Effective date: 20080606

NLR2 Nl: decision of opposition

Effective date: 20080129

REG Reference to a national code

Ref country code: SE

Ref legal event code: ECNC

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20061031

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FI

Payment date: 20081014

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20081028

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IE

Payment date: 20071011

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: PT

Payment date: 20070927

Year of fee payment: 12