EP0723024A1 - Process and a continuous process line for producing cold-rolled steel strip - Google Patents

Process and a continuous process line for producing cold-rolled steel strip Download PDF

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Publication number
EP0723024A1
EP0723024A1 EP95118940A EP95118940A EP0723024A1 EP 0723024 A1 EP0723024 A1 EP 0723024A1 EP 95118940 A EP95118940 A EP 95118940A EP 95118940 A EP95118940 A EP 95118940A EP 0723024 A1 EP0723024 A1 EP 0723024A1
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EP
European Patent Office
Prior art keywords
steel strip
strip
production line
cold
treatment section
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.)
Withdrawn
Application number
EP95118940A
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German (de)
French (fr)
Inventor
Bernd Dr. Berger
Peter Reinthal
Gerhard Hiepel
Ian Mackenzie
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Sundwig GmbH
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Sundwiger Eisenhuette Maschinenfabrik GmbH and Co
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Publication date
Application filed by Sundwiger Eisenhuette Maschinenfabrik GmbH and Co filed Critical Sundwiger Eisenhuette Maschinenfabrik GmbH and Co
Publication of EP0723024A1 publication Critical patent/EP0723024A1/en
Withdrawn legal-status Critical Current

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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
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B2001/228—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length skin pass rolling or temper rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product

Definitions

  • the invention relates to a method for producing cold-rolled steel strip, in particular for producing cold-rolled, stainless steel strip, in a production line, into which the steel strip is fed as hot strip and is subjected to a rolling process and in which it is subsequently fed to a cold strip treatment without the interposition of further structure-changing processes becomes.
  • the invention further relates to a production line for producing cold-rolled steel strip with a heat treatment section, which comprises a roll stand for rolling the steel strip fed into the production line as hot strip, and with a cold strip treatment section adjoining the hot strip treatment section.
  • cold rolled steel strips of good quality can be produced from hot strip in a continuous processing process.
  • the respective processing process is each subdivided into a heat treatment section and a cold strip treatment section, the steel strip which is initially fed into the production line as hot strip being continuously conveyed from the hot strip treatment section into the cold strip treatment section.
  • the Hot strip treatment step other than a rolling process no other treatment section.
  • the steel strip is shaped both with regard to its structure and its surface in such a way that it can be fed to the cold strip treatment immediately afterwards.
  • This cold strip treatment includes the annealing, pickling and stretch straightening of the steel strip in the known production line.
  • the object of the invention is, based on the production line and the corresponding method explained above, to provide a method and a treatment line with which cold-rolled steel strip can be produced, which also meets the highest quality requirements.
  • this object is achieved in that the steel strip is completely descaled in a chemical and / or electrolytic process before the rolling process.
  • the steel strip can conventionally anneal, pickle / passivate the treatment sections in the cold strip treatment section, which may be carried out as a chemical and / or electrolytic process can and run through stretching.
  • the annealing treatment should also be carried out in a known manner under protective gas.
  • the surface finish can include, for example, grinding, polishing, dyeing, embossing, laminating or etching the steel strip.
  • the steel strip is stretch-oriented between the annealing and the pickling / passivation in order to achieve an improvement in the flatness of the strip for the pickling / passivation process.
  • the above-mentioned object is achieved in that a device for chemical descaling of the steel strip working in a chemical and / or electrolytic manner is arranged in front of the roll stand of the hot strip treatment section in the conveying direction.
  • a device for chemical descaling of the steel strip working in a chemical and / or electrolytic manner is arranged in front of the roll stand of the hot strip treatment section in the conveying direction.
  • the steel strip in the hot strip treatment section of the production line according to the invention passes through a descaling device before rolling, it is achieved that the strip is then rolled with a surface texture that is the prerequisite for the production of cold-rolled steel strip of the highest quality.
  • the device for descaling upstream of the roll stand can contain suitable means via which the strip can additionally is descaled mechanically, the suitability of the agents depending on whether they enable descaling of the strip that is sufficiently gentle and prevents deeper damage to the surface.
  • a belt store should also be arranged in the conveying direction of the steel belt in front of the device for descaling the steel belt, with the aid of which the transport speed of the steel belt can be adapted to the treatment time required for carrying out the individual treatment steps.
  • a further strip store should be arranged behind the roll stand of the heat treatment section in the conveying direction.
  • an annealing device a first device for straightening the steel strip, a device for pickling or passivating the steel strip, a device for skin-passaging or re-rolling the steel strip and a second device for stretch rolling can be arranged in succession be arranged.
  • a device for surface finishing in the conveying direction of the steel strip at the end of the cold strip treatment section.
  • a device for inspecting the surface condition of the steel strip can also be arranged at the end of the cold strip treatment section.
  • an inspection device should be arranged both in front of and behind the surface finishing device in order to be able to first check the result of the preceding cold strip treatment steps and then the result of the surface finishing.
  • the single figure shows the schematic structure of a production line 1 according to the invention, in which a steel strip S is processed.
  • This production line 1 is divided into a hot strip treatment section 2 and a cold strip treatment section 3.
  • the steel strip S is fed as hot strip via an unwinding group 4 into the hot strip treatment section 2 of the production line 1, it being possible for the beginning of a newly delivered hot strip coil C to be connected to the end of the steel strip S last processed in the production line 1 by means of a welding device 5.
  • the steel strip S first passes through a first strip store 6, onto which a trimming shear 7 for trimming the edges of the steel strip S, a device for descaling 8, a tandem mill stand 9 and a device for degreasing 10 of the steel strip S follows.
  • the steel strip S is descaled by electrolytic or chemical means. It is also possible to use a combination of these methods for descaling.
  • 8 suitable brushes can be used in the descaling device, with which the surface of the steel strip S can be descaled without the risk of grooves or furrows.
  • the steel strip S leaves the hot strip treatment section 2 with a glossy, smooth surface.
  • a second strip store 11 is arranged between the hot strip treatment section 2 and the cold strip treatment section 3, in order to ensure that the steel strip S emerging from the hot strip treatment section 2 is continuously conveyed into the cold strip treatment section 3.
  • the steel strip S first passes through an annealing device 12, in which it is optionally subjected to an annealing treatment under protective gas. The flatness of the steel strip S is then improved in a stretch straightening device 13. Within the subsequent device 14, the steel strip S is then pickled or passivated by electrolytic or chemical means, by a combination of these methods and / or in a salt bath.
  • the device for pickling or passivating 14 is followed in the conveying direction F of the steel strip S by a third strip store 15, which ensures that the annealing and pickling / passivation process can be carried out continuously.
  • a first inspection device 18 is arranged in the conveying direction F, which checks the steel strip S, for example by means of a grain size or hardness measurement, as well as a visual inspection or automatic inspection of the steel strip S enables.
  • the steel strip S is surface-finished, for example by grinding.
  • the result of the surface finishing can be checked via a second inspection device 20.
  • the finished cold-rolled steel strip S is wound on a take-up reel 21.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

Mfg. process for cold rolled steel strip, esp. stainless steel strip, in an integrated processing line (1) in which the strip is entered as hot strip and rolled and continuously cold process without intermediate structure-modifying processes, comprises fully descaled in a chemical and/or electrolytic treatment prior to rolling. An appropriate prodn. line is also claimed.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen von kaltgewalztem Stahlband, insbesondere zum Herstellen von kaltgewalztem, nicht rostendem Stahlband, in einer Fertigungslinie, in die das Stahlband als Warmband eingespeist und einem Walzprozeß unterzogen wird und in der es anschließend ohne Zwischenschaltung weiterer gefügeverändernder Prozesse einer Kaltbandbehandlung zugeführt wird. Des weiteren betrifft die Erfindung eine Fertigungslinie zum Herstellen von kaltgewalztem Stahlband mit einem Warmbehandlungsabschnitt, der ein Walzgerüst zum Walzen des als Warmband in die Fertigungslinie eingespeisten Stahlbandes umfaßt, und mit einem sich an den Warmbandbehandlungsabschnitt anschließenden Kaltbandbehandlungsabschnitt.The invention relates to a method for producing cold-rolled steel strip, in particular for producing cold-rolled, stainless steel strip, in a production line, into which the steel strip is fed as hot strip and is subjected to a rolling process and in which it is subsequently fed to a cold strip treatment without the interposition of further structure-changing processes becomes. The invention further relates to a production line for producing cold-rolled steel strip with a heat treatment section, which comprises a roll stand for rolling the steel strip fed into the production line as hot strip, and with a cold strip treatment section adjoining the hot strip treatment section.

Durch Anwendung des eingangs genannten Verfahrens und durch den Einsatz von Fertigungslinien der voranstehend genannten Art können aus Warmband in einem kontinuierlichen Verarbeitungsprozeß kaltgewalzte Stahlbänder von guter Qualität hergestellt werden. Dabei ist der jeweilige Verarbeitungsprozeß jeweils in einen Warmbehandlungsabschnitt und einen Kaltbandbehandlungsabschnitt unterteilt, wobei das zunächst als Warmband in die Fertigungslinie eingespeiste Stahlband von dem Warmbandbehandlungsabschnitt kontinuierlich in den Kaltbandbehandlungsabschnitt gefördert wird.By using the method mentioned at the beginning and by using production lines of the type mentioned above, cold rolled steel strips of good quality can be produced from hot strip in a continuous processing process. The respective processing process is each subdivided into a heat treatment section and a cold strip treatment section, the steel strip which is initially fed into the production line as hot strip being continuously conveyed from the hot strip treatment section into the cold strip treatment section.

Bei einer aus der US-Patentschrift US-PS 5 197 179 bekannten Fertigungslinie der eingangs genannten Art umfaßt der Warmbandbehandlungsschritt außer einem Walzprozeß keinen anderen Behandlungsabschnitt. Durch das Walzen wird das Stahlband sowohl hinsichtlich seines Gefüges als auch seiner Oberfläche so umgeformt, daß es unmittelbar anschließend der Kaltbandbehandlung zugeführt werden kann. Diese Kaltbandbehandlung umfaßt die bei der bekannten Fertigungslinie u.a. das Glühen, Beizen und Streckrichten des Stahlbandes.In a production line of the type mentioned at the beginning of US Pat. No. 5,197,179, the Hot strip treatment step other than a rolling process no other treatment section. By rolling, the steel strip is shaped both with regard to its structure and its surface in such a way that it can be fed to the cold strip treatment immediately afterwards. This cold strip treatment includes the annealing, pickling and stretch straightening of the steel strip in the known production line.

Mit der bekannten Fertigungslinie können innerhalb relativ kurzer Fertigungszeiten große Mengen an Stahlband hergestellt werden. Dabei besteht ein weiterer Vorteil darin, daß schon aufgrund der einzelnen unmittelbar aufeinander folgenden Behandlungsabschnitte die bekannte Linie mit einem Minimum an Personal- und Energiekosten betrieben werden kann. Diesen Vorteilen steht jedoch der bei der praktischen Erprobung einer solchen Fertigungslinie festgestellte Nachteil gegenüber, daß die Qualität des in einer solchen Linie hergestellten kaltgewalzten Stahlbandes nicht den hohen Anforderungen gerecht wird, die in vielen Fällen an derartige Bänder gestellt werden.With the known production line, large quantities of steel strip can be produced within relatively short production times. Another advantage is that the known line can be operated with a minimum of personnel and energy costs due to the individual immediately successive treatment sections. However, these advantages are offset by the disadvantage found in the practical testing of such a production line that the quality of the cold-rolled steel strip produced in such a line does not meet the high requirements which are placed on such strips in many cases.

Die Aufgabe der Erfindung besteht darin, ausgehend von der vorstehend erläuterten Fertigungslinie und dem entsprechenden Verfahren ein Verfahren und eine Behandlungslinie zu schaffen, mit der sich kaltgewalztes Stahlband herstellen läßt, das auch höchsten Qualitätsanforderungen genügt.The object of the invention is, based on the production line and the corresponding method explained above, to provide a method and a treatment line with which cold-rolled steel strip can be produced, which also meets the highest quality requirements.

Diese Aufgabe wird hinsichtlich des Verfahrens dadurch gelöst, daß das Stahlband vor dem Walzprozeß in einem chemischen und/oder elektrolytischen Prozeß vollständig entzundert wird.With regard to the method, this object is achieved in that the steel strip is completely descaled in a chemical and / or electrolytic process before the rolling process.

Durch das vollständige Entzundern des Stahlbands vor dem Walzprozeß wird verhindert, daß die auf dem Stahlband andernfalls haftende Zunderschicht während des Walzens in das Band eingedrückt wird. Auf diese Weise wird eine Beschädigung der Bandoberfläche vermieden und eine gleichmäßige Kraftverteilung während des Walzens erreicht. Gleichzeitig wird durch die ggf. kombinierte Anwendung eines chemischen oder elektrolytischen Entzunderungsprozesses sichergestellt, daß die Entzunderungsbehandlung selbst zu keiner wesentlichen Beschädigung der Bandoberfläche führt.The complete descaling of the steel strip before the rolling process prevents that on the steel strip otherwise adhesive scale layer is pressed into the strip during rolling. In this way, damage to the strip surface is avoided and an even distribution of force is achieved during rolling. At the same time, the combined use of a chemical or electrolytic descaling process, if necessary, ensures that the descaling treatment itself does not lead to any significant damage to the strip surface.

Das vollständige Entzundern mittels der zu diesem Zweck erfindungsgemäß zur Entzunderung vorgeschlagenen, die Oberfläche des behandelten Stahlbandes nur unwesentlich verletzenden Methoden hat zur Folge, daß das entsprechend behandelte, als Warmband in die erfindungsgemäße Fertigungslinie eingespeiste Stahlband nach der Walzbehandlung eine glänzend glatte Oberfläche aufweist. Dieser Zustand des Stahlbands bei Verlassen des Warmbandbehandlungsabschnitts der erfindungsgemäßen Fertigungslinie ermöglicht es, aus diesem Band in der nachfolgenden Kaltbandbehandlung ein kaltgewalztes Stahlband herzustellen, das höchsten Qualitätsanforderungen genügt.The complete descaling by means of the methods proposed for descaling according to the invention for this purpose, which only insignificantly injure the surface of the treated steel strip, has the consequence that the correspondingly treated steel strip, fed as hot strip into the production line according to the invention, has a glossy smooth surface after the rolling treatment. This condition of the steel strip when it leaves the hot strip treatment section of the production line according to the invention makes it possible to produce a cold-rolled steel strip from this strip in the subsequent cold strip treatment, which meets the highest quality requirements.

Je nach Beschaffenheit des Stahlbandes kann es erforderlich oder sinnvoll sein, ergänzend zu dem chemischen und/oder elektrolytischen Entzundern das Band mechanisch von Zunder zu befreien. Hierbei ist jedoch zu beachten, daß diese mechanische Entzunderung nicht zu einer Beschädigung der Bandoberfläche führt, die in dem anschließenden Walzprozeß nicht mehr ausgeglichen werden kann.Depending on the nature of the steel strip, it may be necessary or sensible to mechanically remove scale from the strip in addition to chemical and / or electrolytic descaling. It should be noted, however, that this mechanical descaling does not lead to damage to the strip surface, which cannot be compensated for in the subsequent rolling process.

Das Stahlband kann, nachdem es den Walzprozeß des Warmbandbehandlungsabschnitts durchlaufen hat, in herkömmlicher Weise in dem Kaltbandbehandlungsabschnitt die Behandlungsabschnitte Glühen, Beizen/Passivieren, das ggf. als chemischer und/oder elektrolytischer Prozeß durchgeführt werden kann, und Streckrichten durchlaufen. Dabei sollte in Abhängigkeit von der gewünschten Fertigungsqualität die Glühbehandlung in ebenfalls bekannter Weise unter Schutzgas erfolgen.After it has passed through the rolling process of the hot strip treatment section, the steel strip can conventionally anneal, pickle / passivate the treatment sections in the cold strip treatment section, which may be carried out as a chemical and / or electrolytic process can and run through stretching. Depending on the desired manufacturing quality, the annealing treatment should also be carried out in a known manner under protective gas.

Auch wird es für viele Anwendungsfälle erforderlich sein, innerhalb des Kaltbandbehandlungsabschnitts eine Oberflächenveredelung vorzunehmen. Dabei kann die Oberflächenveredelung beispielsweise das Schleifen, Polieren, Färben, Prägen, Kaschieren oder Ätzen des Stahlbandes umfassen.It will also be necessary for many applications to carry out a surface refinement within the cold strip treatment section. The surface finish can include, for example, grinding, polishing, dyeing, embossing, laminating or etching the steel strip.

Ebenfalls in Abhängigkeit von der Beschaffenheit des zu verarbeitenden Stahlbandes ist es in manchen Anwendungsfällen günstig, wenn das Stahlband zwischen dem Glühen und dem Beizen/Passivieren streckgerichtet wird, um eine Verbesserung der Planheit des Bandes für den Beiz-/Passivierprozeß zu erreichen.Also depending on the nature of the steel strip to be processed, it is advantageous in some applications if the steel strip is stretch-oriented between the annealing and the pickling / passivation in order to achieve an improvement in the flatness of the strip for the pickling / passivation process.

Hinsichtlich der Fertigungslinie zum Herstellen von kaltgewalztem Stahlband wird die voranstehend genannte Aufgabe dadurch gelöst, daß in Förderrichtung vor dem Walzgerüst des Warmbandbehandlungsabschnitts eine auf chemischen und/oder elektrolytischem Wege arbeitende Vorrichtung zum vollständigen Entzundern des Stahlbandes angeordnet ist. Dadurch, daß das Stahlband im Warmbandbehandlungsabschnitt der erfindungsgemäßen Fertigungslinie vor dem Walzen eine Entzunderungsvorrichtung durchläuft, wird erreicht, daß das Band anschließend mit einer Oberflächenbeschaffenheit gewalzt wird, die die Voraussetzung für die Herstellung von kaltgewalztem Stahlband höchster Güte ist.With regard to the production line for the production of cold-rolled steel strip, the above-mentioned object is achieved in that a device for chemical descaling of the steel strip working in a chemical and / or electrolytic manner is arranged in front of the roll stand of the hot strip treatment section in the conveying direction. Characterized in that the steel strip in the hot strip treatment section of the production line according to the invention passes through a descaling device before rolling, it is achieved that the strip is then rolled with a surface texture that is the prerequisite for the production of cold-rolled steel strip of the highest quality.

Die dem Walzgerüst vorgeordnete Vorrichtung zum Entzundern kann geeignete Mittel enthalten, über die das Band zusätzlich mechanisch entzundert wird, wobei die Eignung der Mittel davon abhängt, ob sie eine ausreichend schonende, tiefere Beschädigungen der Oberfläche ausschließende Entzunderung des Bandes ermöglichen.The device for descaling upstream of the roll stand can contain suitable means via which the strip can additionally is descaled mechanically, the suitability of the agents depending on whether they enable descaling of the strip that is sufficiently gentle and prevents deeper damage to the surface.

Hinsichtlich der praktischen Verwendung der erfindungsgemäßen Fertigungslinie ist es sinnvoll, wenn in Förderrichtung des Stahlbandes vor der Vorrichtung zum Entzundern eine Besäumschere angeordnet ist.With regard to the practical use of the production line according to the invention, it makes sense if a trimming shear is arranged in the conveying direction of the steel strip in front of the device for descaling.

Auch sollte in Förderrichtung des Stahlbandes vor der Vorrichtung zum Entzundern des Stahlbandes ein Bandspeicher angeordnet sein, mit dessen Hilfe die Transportgeschwindigkeit des Stahlbands an die für die Durchführung der einzelnen Behandlungsschritte benötigte Behandlungzeit angepaßt werden kann.A belt store should also be arranged in the conveying direction of the steel belt in front of the device for descaling the steel belt, with the aid of which the transport speed of the steel belt can be adapted to the treatment time required for carrying out the individual treatment steps.

Des gleichen wird es in vielen Anwendungsfällen sinnvoll sein, wenn in Förderrichtung des Stahlbandes hinter dem Walzgerüst eine Vorrichtung zum Entfetten des Stahlbandes angeordnet ist, um nach dem Walzen auf dem Stahlband haftende Verunreinigungen von diesem zu entfernen.The same will make sense in many applications if a device for degreasing the steel strip is arranged behind the roll stand in the conveying direction of the steel strip in order to remove contaminants adhering to the steel strip after the rolling.

Um ein kontinuierliches Weiterbearbeiten des Stahlbandes nach dem Warmbandbehandlungsabschnitt in dem Kaltbandbehandlungsabschnitt sicherzustellen, sollte in Förderrichtung hinter dem Walzgerüst des Warmbehandlungsabschnitts ein weiterer Bandspeicher angeordnet sein.In order to ensure continuous further processing of the steel strip after the hot strip treatment section in the cold strip treatment section, a further strip store should be arranged behind the roll stand of the heat treatment section in the conveying direction.

Innerhalb des Kaltbandbehandlungsabschnitts der erfindungsgemäßen Fertigungslinie kann hintereinander eine Glühvorrichtung, eine erste Vorrichtung zum Streckrichten des Stahlbandes, eine Vorrichtung zum Beizen oder Passivieren des Stahlbandes, eine Vorrichtung zum Dressieren oder Nachwalzen des Stahlbandes und eine zweite Vorrichtung zum Streckwalzen angeordnet sein. Auch wird es in vielen Fällen sinnvoll sein, in Förderrichtung des Stahlbandes am Ende des Kaltbandbehandlungsabschnitts eine Vorrichtung zur Oberflächenveredelung anzuordnen. Des gleichen kann am Ende des Kaltbandbehandlungsabschnitts eine Vorrichtung zur Inspektion der Oberflächenbeschaffenheit des Stahlbandes angeordnet sein.Within the cold strip treatment section of the production line according to the invention, an annealing device, a first device for straightening the steel strip, a device for pickling or passivating the steel strip, a device for skin-passaging or re-rolling the steel strip and a second device for stretch rolling can be arranged in succession be arranged. In many cases it will also make sense to arrange a device for surface finishing in the conveying direction of the steel strip at the end of the cold strip treatment section. A device for inspecting the surface condition of the steel strip can also be arranged at the end of the cold strip treatment section.

Für den Fall, daß die Kaltbandbehandlung eine Oberflächenflächenveredelung umfaßt, sollte sowohl vor als auch hinter der Vorrichtung zur Oberflächenveredelung jeweils eine Inspektionseinrichtung angeordnet sein, um zunächst das Ergebnis der vorangehenden Kaltbandbehandlungsschritte und anschließend das Ergebnis der Oberflächenveredelung für sich überprüfen zu können.In the event that the cold strip treatment comprises surface surface finishing, an inspection device should be arranged both in front of and behind the surface finishing device in order to be able to first check the result of the preceding cold strip treatment steps and then the result of the surface finishing.

Nachfolgend wird die Erfindung anhand einer ein Ausführungsbeispiel zeigenden Zeichnung näher erläutert.The invention is explained in more detail below with the aid of a drawing showing an exemplary embodiment.

Die einzige Figur zeigt den schematischen Aufbau einer erfindungsgemäßen Fertigungslinie 1, in der ein Stahlband S verarbeitet wird. Diese Fertigungslinie 1 ist in einen Warmbandbehandlungsabschnitt 2 und einen Kaltbandbehandlungsabschnitt 3 unterteilt.The single figure shows the schematic structure of a production line 1 according to the invention, in which a steel strip S is processed. This production line 1 is divided into a hot strip treatment section 2 and a cold strip treatment section 3.

Das Stahlband S wird als Warmband über eine Abwickelgruppe 4 in den Warmbandbehandlungsabschnitt 2 der Fertigungslinie 1 eingespeist, wobei der Anfang eines neu angelieferten Warmband-Coils C mittels einer Schweißvorrichtung 5 an das Ende des zuletzt in der Fertigungslinie 1 verarbeiteten Stahlbands S angeschlossen werden kann.The steel strip S is fed as hot strip via an unwinding group 4 into the hot strip treatment section 2 of the production line 1, it being possible for the beginning of a newly delivered hot strip coil C to be connected to the end of the steel strip S last processed in the production line 1 by means of a welding device 5.

Innerhalb des Warmbandbehandlungsabschnitts 2 durchläuft das Stahlband S zunächst einen ersten Bandspeicher 6, auf den eine Besäumschere 7 zum Besäumen der Ränder des Stahlbands S, eine Vorrichtung zum Entzundern 8, ein Tandem-Walzgerüst 9 und eine Vorrichtung zum Entfetten 10 des Stahlbands S folgt.Within the hot strip treatment section 2, the steel strip S first passes through a first strip store 6, onto which a trimming shear 7 for trimming the edges of the steel strip S, a device for descaling 8, a tandem mill stand 9 and a device for degreasing 10 of the steel strip S follows.

In der Vorrichtung zum Entzundern 8 wird das Stahlband S auf elektrolytischem oder chemischem Weg entzundert. Auch ist es möglich, eine Kombination dieser Methoden zur Entzunderung zu nutzten. Ergänzend können in der Vorrichtung zum Entzundern 8 geeignete, hier nicht gezeigte Bürsten eingesetzt werden, mit denen sich die Oberfläche des Stahlbands S ohne die Gefahr des Entstehens von Riefen oder Furchen entzundern läßt.In the descaling device 8, the steel strip S is descaled by electrolytic or chemical means. It is also possible to use a combination of these methods for descaling. In addition, 8 suitable brushes, not shown here, can be used in the descaling device, with which the surface of the steel strip S can be descaled without the risk of grooves or furrows.

Das Stahlband S verläßt den Warmbandbehandlungsabschnitt 2 mit einer glänzend glatten Oberfläche. Ein zweiter Bandspeicher 11 ist zwischen dem Warmbandbehandlungsabschnitt 2 und dem Kaltbandbehandlungsabschnitt 3 angeordnet, um sicherzustellen, daß das aus dem Warmbandbehandlungsabschnitt 2 austretende Stahlband S kontinuierlich in den Kaltbandbehandlungsabschnitt 3 gefördert wird.The steel strip S leaves the hot strip treatment section 2 with a glossy, smooth surface. A second strip store 11 is arranged between the hot strip treatment section 2 and the cold strip treatment section 3, in order to ensure that the steel strip S emerging from the hot strip treatment section 2 is continuously conveyed into the cold strip treatment section 3.

In dem Kaltbandbehandlungsabschnitt 3 durchläuft das Stahlband S zunächst eine Glüheinrichtung 12, in der es ggf. unter Schutzgas einer Glühbehandlung unterzogen wird. Anschließend wird die Planheit des Stahlbandes S in einer Streckricht-Vorrichtung 13 verbessert. Innerhalb der darauf folgenden Vorrichtung 14 wird das Stahlband S dann auf elektolytischem oder chemischem Wege, durch eine Kombination dieser Methoden und bzw. oder in einem Salzbad gebeizt oder passiviert.In the cold strip treatment section 3, the steel strip S first passes through an annealing device 12, in which it is optionally subjected to an annealing treatment under protective gas. The flatness of the steel strip S is then improved in a stretch straightening device 13. Within the subsequent device 14, the steel strip S is then pickled or passivated by electrolytic or chemical means, by a combination of these methods and / or in a salt bath.

Auf die Vorrichtung zum Beizen oder Passivieren 14 folgt in Förderrichtung F des Stahlbands S ein dritter Bandspeicher 15, durch den sichergestellt ist, daß der Glüh- und Beiz-/Passivierprozeß kontinuierlich durchgeführt werden kann.The device for pickling or passivating 14 is followed in the conveying direction F of the steel strip S by a third strip store 15, which ensures that the annealing and pickling / passivation process can be carried out continuously.

In Förderrichtung F hinter der Nachwalzvorrichtung 16 durchläuft das Stahlband S eine zweite Streckricht-Walzvorrichtung 17. Hinter dieser ist in Förderrichtung F eine erste Inspektionseinrichtung 18 angeordnet, die eine Kontrolle des Stahlbandes S beispielsweise mittels einer Korngrößen- oder Härtemessung sowie eine visuelle Kontrolle oder automatische Inspektion des Stahlbandes S ermöglicht.In the conveying direction F behind the rerolling device 16, the steel strip S passes through a second stretching-direction rolling device 17. Behind this, a first inspection device 18 is arranged in the conveying direction F, which checks the steel strip S, for example by means of a grain size or hardness measurement, as well as a visual inspection or automatic inspection of the steel strip S enables.

In der darauf folgenden Vorrichtung 19 wird das Stahlband S beispielsweise durch Schleifen oberflächenveredelt. Das Ergebnis der Oberflächenveredlung kann über eine zweite Inspektionseinrichtung 20 kontrolliert werden. Schließlich wird das fertiggestellte kaltgewalzte Stahlband S auf einer Aufwickelhaspel 21 aufgewickelt.In the subsequent device 19, the steel strip S is surface-finished, for example by grinding. The result of the surface finishing can be checked via a second inspection device 20. Finally, the finished cold-rolled steel strip S is wound on a take-up reel 21.

Claims (18)

Verfahren zum Herstellen von kaltgewalztem Stahlband (S) insbesondere zum Herstellen von kaltgewalztem, nicht rostendem Stahlband, in einer Behandlungslinie (1), in die das Stahlband (S) als Warmband eingespeist und einem Walzprozeß unterzogen wird und in der es anschließend kontinuierlich, ohne Zwischenschaltung weiterer gefügeverändernder Prozesse einer Kaltbandbehandlung zugeführt wird, dadurch gekennzeichnet, daß das Stahlband (S) vor dem Walzprozeß in einem chemischen und/oder elektrolytischen Prozeß vollständig entzundert wird.Method for producing cold-rolled steel strip (S), in particular for producing cold-rolled, stainless steel strip, in a treatment line (1), into which the steel strip (S) is fed in as a hot strip and is subjected to a rolling process and in which it is then continuously, without intermediate connection further microstructure-changing processes are fed to a cold strip treatment, characterized in that the steel strip (S) is completely descaled in a chemical and / or electrolytic process before the rolling process. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Stahlband (S) ergänzend zu dem chemischen und/oder elektrolytischen Entzundern mechanisch entzundert wird.Method according to Claim 1, characterized in that the steel strip (S) is descaled mechanically in addition to the chemical and / or electrolytic descaling. Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß das Stahlband (S) innerhalb der Kaltbandbehandlung die Behandlungsabschnitte Glühen, Beizen/Passivieren und Streckrichten durchläuft.Method according to one of claims 1 or 2, characterized in that the steel strip (S) passes through the treatment sections of annealing, pickling / passivation and stretch straightening during the cold strip treatment. Verfahren nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß die Kaltbandbehandlung den Behandlungsabschnitt einer Oberflächenveredelung umfaßt.Method according to one of the preceding claims, characterized in that the cold strip treatment comprises the treatment section of a surface refinement. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß das Stahlband (S) zwischen dem Glühen und dem Beizen/Passivieren streckgerichtet wird.Method according to claim 3, characterized in that the steel strip (S) is stretch-oriented between annealing and pickling / passivating. Verfahren nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, daß das Glühen des Stahlbandes unter Schutzgas erfolgt.Method according to one of claims 3 to 5, characterized in that the annealing of the steel strip is carried out under a protective gas. Verfahren nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, daß das Beizen/Passivieren als chemischer und/oder elektrolytischer Prozeß durchgeführt wird.Method according to one of claims 3 to 6, characterized in that the pickling / passivation is carried out as a chemical and / or electrolytic process. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß die Oberflächenveredelung das Schleifen, Polieren, Färben, Prägen, Kaschieren oder Ätzen des Stahlbandes umfaßt.A method according to claim 4, characterized in that the surface finishing comprises grinding, polishing, dyeing, embossing, laminating or etching the steel strip. Fertigungslinie zum Herstellen von kaltgewalztem Stahlband (S) mit einem Warmbehandlungsabschnitt (2), der ein Walzgerüst (9) zum Walzen des als Warmband in die Fertigungslinie (1) eingespeisten Stahlbandes (S) umfaßt, und mit einem sich an den Warmbandbehandlungsabschnitt (2) anschließenden Kaltbandbehandlungsabschnitt (3), dadurch gekennzeichnet, daß in Förderrichtung (F) vor dem Walzgerüst (9) des Warmbandbehandlungsabschnitts (2) eine auf chemischen und/oder elektrolytischem Wege arbeitende Vorrichtung (8) zum vollständigen Entzundern des Stahlbandes (S) angeordnet ist.Production line for producing cold-rolled steel strip (S) with a heat treatment section (2), which comprises a rolling stand (9) for rolling the steel strip (S) fed as hot strip into the production line (1), and with a hot strip treatment section (2) Subsequent cold strip treatment section (3), characterized in that in the conveying direction (F) in front of the roll stand (9) of the hot strip treatment section (2) there is a chemical and / or electrolytic device (8) for completely descaling the steel strip (S). Fertigungslinie nach Anspruch 9, dadurch gekennzeichnet, daß die Vorrichtung zum Entzundern (8) Mittel zum zusätzlichen mechanischen Entzundern des Stahlbandes (S) aufweist.Production line according to claim 9, characterized in that the descaling device (8) has means for additional mechanical descaling of the steel strip (S). Fertigungslinie nach einem der Ansprüche 9 oder 10, dadurch gekennzeichnet, daß in Förderrichtung (F) des Stahlbandes (S) vor der Vorrichtung zum Entzundern (8) eine Besäumschere (7) angeordnet ist.Production line according to one of claims 9 or 10, characterized in that a trimming shear (7) is arranged in the conveying direction (F) of the steel strip (S) in front of the device for descaling (8). Fertigungslinie nach einem der Ansprüche 9 bis 11, dadurch gekennzeichnet, daß in Förderrichtung (F) des Stahlbandes (S) vor der Vorrichtung zum Entzundern (8) des Stahlbandes (S) ein Bandspeicher (6) angeordnet ist.Production line according to one of Claims 9 to 11, characterized in that a strip store (6) is arranged in the conveying direction (F) of the steel strip (S) in front of the device for descaling (8) the steel strip (S). Fertigungslinie nach einem der Ansprüche 9 bis 12, dadurch gekennzeichnet, daß in Förderrichtung (F) des Stahlbandes (S) hinter dem Walzgerüst (9) eine Vorrichtung zum Entfetten (10) des Stahlbandes (S) angeordnet ist.Production line according to one of claims 9 to 12, characterized in that a device for degreasing (10) the steel strip (S) is arranged in the conveying direction (F) of the steel strip (S) behind the roll stand (9). Fertigungslinie nach einem der Ansprüche 9 bis 13, dadurch gekennzeichnet, daß in Förderrichtung (F) hinter dem Walzgerüst (9) ein weiterer Bandspeicher (11) angeordnet ist.Production line according to one of Claims 9 to 13, characterized in that a further strip store (11) is arranged behind the roll stand (9) in the conveying direction (F). Fertigungslinie nach einem der Ansprüche 9 bis 14, dadurch gekennzeichnet, daß in dem Kaltbandbehandlungsabschnitt (2) hintereinander eine Glühvorrichtung (12), eine erste Vorrichtung zum Streckrichten (13) des Stahlbandes (S), eine Vorrichtung zum Beizen oder Passivieren (14) des Stahlbandes (S), eine Vorrichtung zum Dressieren oder Nachwalzen (16) des Stahlbandes (S) und eine zweite Vorrichtung zum Streckwalzen (17) angeordnet ist.Production line according to one of claims 9 to 14, characterized in that in the cold strip treatment section (2) one after the other an annealing device (12), a first device for stretch straightening (13) of the steel strip (S), a device for pickling or passivating (14) the Steel strip (S), a device for skin-dressing or re-rolling (16) of the Steel strip (S) and a second device for stretch rolling (17) is arranged. Fertigungslinie nach einem der Ansprüche 9 bis 15, dadurch gekennzeichnet, daß in Förderrichtung (F) des Stahlbandes (S) am Ende des Kaltbandbehandlungsabschnitts (3) eine Vorrichtung zur Oberflächenveredelung (19) angeordnet ist.Production line according to one of claims 9 to 15, characterized in that a device for surface finishing (19) is arranged in the conveying direction (F) of the steel strip (S) at the end of the cold strip treatment section (3). Fertigungslinie nach einem der Ansprüche 9 bis 16, dadurch gekennzeichnet, daß in Förderrichtung (F) des Stahlbandes (S) am Ende des Kaltbandbehandlungsabschnitts (3) eine Vorrichtung zur Inspektion (18,20) der Beschaffenheit des Stahlbandes (S) angeordnet ist.Production line according to one of Claims 9 to 16, characterized in that a device for inspecting (18, 20) the condition of the steel strip (S) is arranged in the conveying direction (F) of the steel strip (S) at the end of the cold strip treatment section (3). Fertigungslinie nach Anspruch 16 und 17, dadurch gekennzeichnet, daß in Förderrichtung (F) des Stahlbandes (S) sowohl vor als auch hinter der Vorrichtung zur Oberflächenveredelung (19) jeweils eine Inspektionseinrichtung (18,20) angeordnet ist.Production line according to claims 16 and 17, characterized in that an inspection device (18, 20) is arranged in the conveying direction (F) of the steel strip (S) both in front of and behind the device for surface finishing (19).
EP95118940A 1994-12-22 1995-12-01 Process and a continuous process line for producing cold-rolled steel strip Withdrawn EP0723024A1 (en)

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EP0770707A1 (en) * 1995-09-01 1997-05-02 Keramchemie GmbH Process for producing cold-rolled strip continuously
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