EP0885974B1 - Process for rolling wide hot strip in a compact strip production line - Google Patents

Process for rolling wide hot strip in a compact strip production line Download PDF

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Publication number
EP0885974B1
EP0885974B1 EP98110734A EP98110734A EP0885974B1 EP 0885974 B1 EP0885974 B1 EP 0885974B1 EP 98110734 A EP98110734 A EP 98110734A EP 98110734 A EP98110734 A EP 98110734A EP 0885974 B1 EP0885974 B1 EP 0885974B1
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EP
European Patent Office
Prior art keywords
temperature
rolling
strip
reshaping
recrystallisation
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EP98110734A
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German (de)
French (fr)
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EP0885974A1 (en
Inventor
Karl-Ernst Dr. Ing. Habil. Hensger
Robert Bs Met. Eng R Mba Davis
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SMS Siemag AG
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SMS Demag AG
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    • 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
    • B21B1/26—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 hot-rolling, e.g. Steckel hot mill
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
    • C21D8/0215—Rapid solidification; Thin strip casting
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/466—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B2013/003—Inactive rolling stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/06—Thermomechanical rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B21B37/76—Cooling control on the run-out table
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/006—Pinch roll sets

Definitions

  • the invention relates to a method for rolling hot wide strip from continuously cast thin slabs of ferritic-pearlitic micro-alloyed Structural steels with a micro alloy with vanadium and / or with niobium and / or with Titan in a CSP plant, whereby the cast slab strand, divided into rolling lengths, fed to a multi-stand CSP rolling mill via a compensating furnace and rolled out there continuously to form hot wide strip in a cooling section is cooled and coiled.
  • EP 05 95 282 A1 describes a process for the production of hot-rolled steel strip from continuously cast material, preferably Thin slabs with one step at a time in a heat CSP method known, first of all leaving a compensating furnace Thin slabs after the first roughing pass in a roughing mill to temperatures be heated above 1150 ° C.
  • the roughing mill is a recrystallization zone with, for example, a winding device and downstream of an unwinding device in which possible material-specific longer dwell time recrystallizes the rolling stock, see above that unconsolidated relaxed material is available for the finishing train.
  • the pre-rolled strip is cooled so that the temperature for the first Stitch in the finishing train according to the necessary temperature profile can be optimally adjusted in the finishing train for all steel grades. It follows then finish rolling in the finishing train.
  • thermomechanical forming in contrast to normalizing forming, in which the final forming in the area the normalizing temperature with complete recrystallization of austenite takes place, temperature ranges for one Targeted forming rate observed, at which the austenite is not or not substantially recrystallized, d. H. In any case lies before the actual thermomechanical treatment of the Rolled goods an austenite structure that either no or only small proportions of germs or structural components of the contains lower temperature resistant phase.
  • the setting of this initial structure can be immediate from the casting heat or in a preheating furnace from Room temperature or an intermediate temperature from.
  • the forming of the rolling stock begins in the temperature range of the stable austenite and is continued until just above the A r3 temperature.
  • thermomechanical rolling Temperature range To be the cheapest for thermomechanical rolling Temperature range to come, the piercing temperature of the Rolled goods depending on the desired degree of forming fixed.
  • thermomechanical treatment Use of plastic deformation not only for manufacturing a defined product geometry, but especially for Setting a desired real structure and thus for Guarantee of defined material properties, but not recrystallized austenite to polymorphic gamma (gamma) - aLpha ( ⁇ ) conversion comes (in the normalizing Austenite is already recrystallized).
  • the first shaping is carried out at a temperature above the recrystallization stop temperature (T R ), so that a complete recrystallization of the cast structure takes place during and / or after this first shaping.
  • the recrystallization can take place dynamically and / or metadynamically and / or statically.
  • the next roll stand opened so that to the next but one roll stand, in which then the second forming is done, enough time to Available.
  • the opening of the roll stand closes his Use as a driver is not enough.
  • the further forming in the last rolling stands of the CSP rolling mill then takes place at temperatures below the recrystallization stop temperature (TR) in order to solidify the austenite before its polymorphic transformation.
  • TR recrystallization stop temperature
  • the austenite-hardening forming should not be less than 30%.
  • the finish rolling temperature is close to the A r3 temperature.
  • the polymorphic transformation of the austenite then takes place during the final cooling in, for example, a laminar cooling section at a temperature which lies between the A r3 temperature (temperature of the austenite-ferrite transformation) and the B S temperature (bainite starting temperature).
  • the second forming which may only be carried out in the third roll stand, can preferably be used to initiate a second recrystallization cycle, which leads to further structural refinement and structural homogenization before the forming is carried out again.
  • the subsequent mill stand can also be opened, which can then also be used as a driver if required.
  • the temperature in this second transformation is also above the T R temperature.
  • a plant for carrying out the method of the invention consists of a CSP plant in which cast thin slabs in the Direct use (without intermediate cooling and subsequent Reheating) in a multi-stand CSP mill be reshaped, and in which a controlled Microstructure development in the CSP rolling mill, in the cooling section and in the reel to achieve optimal mechanical Properties on hot broadband is possible, in particular between the first and the second forming as well as if necessary also between the second and third forming one for a complete recrystallization required variable Period is adjustable.
  • a CSP system is shown in the an approximately 6 mm thick hot strip made of high-strength structural steel is produced by thermomechanical rolling.
  • the first forming is carried out with a stitch reduction of 50% in the first roll stand (4) at a forming temperature of 1080 ° C carried out.
  • second roll stand (5) opened and serves only as Driver.
  • the second forming is then carried out in the third roll stand (6) a stitch reduction of 40% at a forming temperature of 1030 ° C carried out. Since here the transformation to another Recrystallization is used, the following is fourth Roll stand (7) also opened and only serves as a driver.
  • the hot wide strip is in a laminar cooling section (11) cooled to 600 ° C (reel temperature) and in one Underfloor reel system (12) wound into a bundle.
  • the corresponding temperature ranges are shown in the drawing figure for the individual process steps.
  • the time period (I) between the first and the second forming serves for a first recrystallization phase, the temperature T being greater than the T R temperature.
  • the time period (II) between the second forming and the third forming serves the second recrystallization phase with a temperature T that is also greater than the T R temperature.
  • the period of time (III) from the third transformation until the last transformation is used for solidification of the austenite at a temperature T between the T R temperature, and the A r3 temperature.
  • the period (IV) after the last forming in which cooling is used serves for the polymorphic transformation of the austenite.
  • the temperature T is between the A r3 temperature and the B S temperature.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Steel (AREA)
  • Insulated Metal Substrates For Printed Circuits (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Walzen von Warmbreitband aus stranggegossenen Dünnbrammen aus ferritisch-perlitisch mikrolegierten Baustählen mit einer Mikrolegierung mit Vanadium und/oder mit Niob und/oder mit Titan in einer CSP-Anlage, wobei der gegossene Brammenstrang, geteilt in Walzlängen, über einen Ausgleichsofen einer mehrgerüstigen CSP-Walzstraße zugeführt und dort kontinuierlich zu Warmbreitband ausgewalzt, in einer Kühlstrecke gekühlt und zu Bunden gehaspelt wird.The invention relates to a method for rolling hot wide strip from continuously cast thin slabs of ferritic-pearlitic micro-alloyed Structural steels with a micro alloy with vanadium and / or with niobium and / or with Titan in a CSP plant, whereby the cast slab strand, divided into rolling lengths, fed to a multi-stand CSP rolling mill via a compensating furnace and rolled out there continuously to form hot wide strip in a cooling section is cooled and coiled.

Aus der EP 05 95 282 A1 ist ein Verfahren zur Herstellung von warmgewalztem Stahlband aus stranggegossenem Vormaterial, vorzugsweise Dünnbrammen mit in einer Hitze aufeinander folgenden Arbeitsschritten eines CSP-Verfahrens bekannt, wobei zunächst die einen Ausgleichsofen verlassenden Dünnbrammen nach dem ersten Vorwalzstich in einer Vorwalzstraße auf Temperaturen über 1150 °C aufgeheizt werden.EP 05 95 282 A1 describes a process for the production of hot-rolled steel strip from continuously cast material, preferably Thin slabs with one step at a time in a heat CSP method known, first of all leaving a compensating furnace Thin slabs after the first roughing pass in a roughing mill to temperatures be heated above 1150 ° C.

Der Vorwalzstraße ist eine Rekristallisationszone mit beispielsweise einer Aufwickelvorrichtung und einer Abwickelvorrichtung nachgeordnet, in der durch die mögliche materialspezifische längere Verweilzeit das Walzgut rekristallisiert, so dass unverfestigtes entspanntes Material für die Fertigstraße zur Verfügung steht.The roughing mill is a recrystallization zone with, for example, a winding device and downstream of an unwinding device in which possible material-specific longer dwell time recrystallizes the rolling stock, see above that unconsolidated relaxed material is available for the finishing train.

Danach wird das vorgewalzte Band so gekühlt, dass die Temperatur für den ersten Stich in der Fertigstraße entsprechend des notwendigen Temperaturverlaufes in der Fertigstraße für alle Stahlqualitäten optimal eingestellt werden kann. Es folgt dann das Fertigwalzen in der Fertigstaße. Then the pre-rolled strip is cooled so that the temperature for the first Stitch in the finishing train according to the necessary temperature profile can be optimally adjusted in the finishing train for all steel grades. It follows then finish rolling in the finishing train.

Das Walzen von Warmbreitband in einer CSP-Anlage (CSP = Compact Strip Production), wobei stranggegossenes Vormaterial nach Unterteilung in Walzlängen über einen Ausgleichsofen direkt dem Walzwerk zugeführt wird, ist aus der EP-A-0368048 bekannt, wobei als Walzwerk ein mehrgerüstiges Walzwerk eingesetzt wird, in das die auf eine Temperatur von 1100 °C bis 1130 °C im Ausgleichsofen gebrachten Walzlängen in aufeinander folgenden Arbeitsschritten mit dazwischen liegender Entzunderung fertig gewalzt werden.Rolling hot wide strip in a CSP system (CSP = Compact Strip Production), with continuously cast primary material after subdivision into rolling lengths Is fed directly to the rolling mill via a compensating furnace is known from EP-A-0368048 known, a multi-stand rolling mill being used as the rolling mill is in which to a temperature of 1100 ° C to 1130 ° C in the compensating furnace brought rolling lengths in successive steps with in between horizontal descaling can be finished rolled.

Um eine Verbesserung der Festigkeit- und Zähigkeitseigenschaften sowie der damit verbundenen wesentlichen Erhöhung der Streckgrenzwerte und der Kerbschlagzähigkeit eines Walzproduktes aus Stahl zu erreichen, wird in der EP-A-0413163 vorgeschlagen, das Walzgut thermomechanisch zu behandeln.To improve the strength and toughness properties as well as the associated significant increase in the yield strength and the Notched impact strength of a rolled product made of steel achieve, is proposed in EP-A-0413163, the rolling stock treat thermomechanically.

Bei der thermomechanischen Umformung werden im Gegensatz zum normalisierenden Umformen, bei der die Endumformung im Bereich der Normalglühtemperatur mit vollständiger Rekristallisation des Austenits stattfindet, Temperaturbereiche für eine gezielte Umformrate eingehalten, bei denen der Austenit nicht oder nicht wesentlich rekristallisiert, d. h. in jedem Fall liegt vor der eigentlichen thermomechanischen Behandlung des Walzgutes ein Austenit-Gefüge vor, das entweder keine oder nur geringe Anteile von Keimen oder Gefügeanteilen der bei niedrigerer Temperatur beständigen Phase enthält.In thermomechanical forming, in contrast to normalizing forming, in which the final forming in the area the normalizing temperature with complete recrystallization of austenite takes place, temperature ranges for one Targeted forming rate observed, at which the austenite is not or not substantially recrystallized, d. H. In any case lies before the actual thermomechanical treatment of the Rolled goods an austenite structure that either no or only small proportions of germs or structural components of the contains lower temperature resistant phase.

Die Einstellung dieses Ausgangsgefüges kann dabei unmittelbar aus der Gießwärme oder in einem Vorwärmofen von Raumtemperatur oder einer Zwischentemperatur aus erfolgen.The setting of this initial structure can be immediate from the casting heat or in a preheating furnace from Room temperature or an intermediate temperature from.

Nach dem in der EP-A-0413163 vorgeschlagenen Verfahren beginnt die Umformung des Walzgutes im Temperaturbereich des stabilen Austenits und wird bis dicht oberhalb der Ar3-Temperatur fortgesetzt.According to the method proposed in EP-A-0413163, the forming of the rolling stock begins in the temperature range of the stable austenite and is continued until just above the A r3 temperature.

Um in den für die thermomechanische Walzung günstigsten Temperaturbereich zu kommen, wird die Anstichtemperatur des Walzgutes in Abhängigkeit vom gewünschten Umformgrad festgelegt.To be the cheapest for thermomechanical rolling Temperature range to come, the piercing temperature of the Rolled goods depending on the desired degree of forming fixed.

Wesensmerkmal der thermomechanischen Behandlung ist die Nutzung der plastischen Deformation nicht nur zur Herstellung einer definierten Produktgeometrie, sondern insbesondere zur Einstellung einer gewünschten Realstruktur und damit zur Gewährleistung definierter Werkstoffeigenschaften, wobei nicht rekristallisierter Austenit zur polymorphen gamma (gamma) - aLpha (α) - Umwandlung kommt (bei der normalisierenden Umformung ist der Austenit bereits rekristallisiert).The essential feature of thermomechanical treatment is Use of plastic deformation not only for manufacturing a defined product geometry, but especially for Setting a desired real structure and thus for Guarantee of defined material properties, but not recrystallized austenite to polymorphic gamma (gamma) - aLpha (α) conversion comes (in the normalizing Austenite is already recrystallized).

Herkömmliche Brammen unterliegen bei Kalteinsatz vor ihrer Umformung in einem konventionellen Walzwerk den polymorphen Umwandlungen:

  • Schmelze (L) → Ferrit (δ) → Austenit A1 (gamma) →
  • → Ferrit (α) → Austenit A2 (gamma)
während für die CSP-Technologie gilt:
  • Schmelze (L) → Ferrit (δ) → Austenit A1 (gamma)
mit einer höheren übersättigung des Mischkristalls Austenit und einem erhöhten Ausscheidungspotential für Karbonitride aus dem Austenit.Conventional slabs are subjected to the polymorphic conversions when used cold before being formed in a conventional rolling mill:
  • Melt (L) → ferrite (δ) → austenite A 1 (gamma) →
  • → ferrite (α) → austenite A 2 (gamma)
while for CSP technology:
  • Melt (L) → ferrite (δ) → austenite A 1 (gamma)
with a higher supersaturation of the austenite mixed crystal and an increased precipitation potential for carbonitrides from the austenite.

Es ist Aufgabe der Erfindung, eine spezifische Verfahrensstrategie für das thermomechanische Walzen in CSP-Anlagen zu entwickeln, um die Besonderheiten der Gefügeentwicklung und die dadurch abgeleiteten Werkstoffeigenschaften durch das Direktwalzen ohne Zwischenkühlung und nachfolgendes Wiedererwärmen beim Walzen von CSP-Brammen in CSP-Anlagen optimal zu nutzen.It is an object of the invention to provide a specific Process strategy for thermomechanical rolling in CSP systems to develop the peculiarities of the Structure development and the derived ones Material properties through direct rolling without Intercooling and subsequent reheating during rolling optimal use of CSP slabs in CSP plants.

Die gestellte Aufgabe wird verfahrenstechnisch durch die Maßnahmen des Anspruchs 1 gelöst. Zur Erzielung optimaler mechanischer Eigenschaften am Warmbreitband wird durch thermomechanisches Walzen eine kontrollierte Gefügeentwicklung beim Durchlauf der Dünnbrammen durch die CSP-Anlage durchgeführt mit folgen den Verfahrensschritten:

  • a) Änderung der Gussstruktur durch Einstellung definierter Temperatur- und Formänderungsbedingungen bei der ersten Umformung, wobei die Temperatur oberhalb der Rekristallisations-Stop-Temperatur (TR) liegt, so dass ohne Unterbrechung des kontinuierlichen Wabuns während und/oder nach der ersten Umformung eine vollständige (dynamische und/oder meta-dynamische und/oder statische) Rekristallisation des Gussgefüges vor Beginn des zweiten Umformschrittes erfolgt;
  • b) Umformung in den letzen Walzgerüsten bei Temperaturen unterhalb der TR-Temperatur, wobei die Umformung einen Betrag von 30 % nicht unterschreiten soll und die Endwalztemperatur nahe bei der Ar3-Temperatur (Temperatur der Austenit/Ferrit-Umwandlung) liegt;
  • c) gesteuerte Abkühlung der Warmbreitbänder in der Kühlstrecke, vorzugsweise einer Laminar-Kühlstrecke, wobei bei einer Temperatur, die zwischen der Ar3-Temperatur und der BS-Temperatur (Bainit-Start-Temperatur) liegt, die polymorphe Umwandlung des Austenits erfolgt.
    • In terms of process technology, the object is achieved by the measures of claim 1. In order to achieve optimal mechanical properties on the hot wide strip, a controlled microstructural development is carried out by thermomechanical rolling when the thin slabs pass through the CSP system with the following process steps:
  • a) Changing the cast structure by setting defined temperature and shape change conditions during the first forming, the temperature being above the recrystallization stop temperature (T R ), so that a complete without interrupting the continuous waving during and / or after the first forming (dynamic and / or meta-dynamic and / or static) recrystallization of the cast structure takes place before the start of the second forming step;
  • b) Forming in the last rolling stands at temperatures below the T R temperature, the forming should not be less than 30% and the finish rolling temperature is close to the A r3 temperature (temperature of the austenite / ferrite transformation);
  • c) Controlled cooling of the hot wide strips in the cooling section, preferably a laminar cooling section, the polymorphic transformation of the austenite taking place at a temperature which is between the A r3 temperature and the B S temperature (bainite start temperature).

    • Durch die erfindungsgemäßen Maßnahmen wird das thermomechanische Umformen in optimaler Weise auf die spezifischen Verfahrensparameter des CSP-Verfahrens mit seiner spezifischen thermischen Vorgeschichte ausgerichtet. Bei der Einstellung der Temperatur und der Formänderungbedingungen sind insbesondere dabei die grundsätzlichen Unterschiede zum konventionellen Walzen zu beachten:

    • in die Fertigstraße eines konventionellen Walzwerkes läuft eine in der Vorstraße vorgewalzte (plastisch deformierte) Bramme mit rekristallisiertem Gefüge ein,
    • in die CSP-Fertigstraße wird die Dünnbramme mit Gussgefüge eingeführt,
    • die Oberflächenbeschaffenheit einer CSP-Dünnbramme unterscheidet sich deutlich von einer vorgewalzten Bramme (beispielsweise durch ihre Topologie).
    The measures according to the invention align the thermomechanical forming in an optimal manner to the specific process parameters of the CSP process with its specific thermal history. When setting the temperature and the shape change conditions, the fundamental differences to conventional rolling must be observed:
    • In the finishing train of a conventional rolling mill, a pre-rolled (plastically deformed) slab with a recrystallized structure enters the roughing train.
    • the thin slab with cast structure is introduced into the CSP finishing train,
    • The surface quality of a CSP thin slab differs significantly from that of a pre-rolled slab (for example due to its topology).

    Durch diese Unterschiede ergeben sich auch Unterschiede bei den durch die Warmumformung ausgelösten Festkörperreaktionen durch beispielsweise

    • unterschiedliche Beweglichkeit der Großwinkelgrenzen,
    • unterschiedliches Mischkristall- und Ausscheidungsverhalten,
    • unterschiedlicher Diffusionsmechanismus und -kinetik durch den unterschiedlichen Charakter der Grenzflächen und chemischen Inhomogenitäten, die gleichfalls bei der Einstellung der Verfahrensparameter zu beachten sind.
    These differences also result in differences in the solid-state reactions triggered by hot forming, for example
    • different mobility of the large-angle borders,
    • different mixed crystal and precipitation behavior,
    • Different diffusion mechanisms and kinetics due to the different character of the interfaces and chemical inhomogeneities, which must also be taken into account when setting the process parameters.

    Gemäß der Erfindung wird die erste Umformung bei einer Temperatur oberhalb der Rekristallisations-Stop-Temperatur (TR) vorgenommen, so dass während und/oder nach dieser ersten Umformung eine vollständige Rekristallisation des Gussgefüges erfolgt. Die Rekristallisation kann dabei dynamisch und/oder metadynamisch und/oder statisch stattfinden.According to the invention, the first shaping is carried out at a temperature above the recrystallization stop temperature (T R ), so that a complete recrystallization of the cast structure takes place during and / or after this first shaping. The recrystallization can take place dynamically and / or metadynamically and / or statically.

    Wichtig ist dabei gemäß der Erfindung, dass diese Rekristallisation vollständig abgeschlossen ist, bevor die nächste Umformung durchgeführt wird. Wenn der Abstand der Gerüste und die Walzgeschwindigkeit für die benötigte Zeitspanne nicht ausreicht, dann kann nach einer vorteilhaften Ausgestaltung der Erfindung das nächste Walzgerüst geöffnet werden, so dass bis zum übernächsten Walzgerüst, in dem dann die zweite Umformung durchgeführt wird, genügend Zeit zur Verfügung steht. Die Öffnung des Walzgerüstes schließt seine Nutzung als Treiber dabei nicht aus.It is important according to the invention that this Recrystallization is fully completed before the next forming is carried out. If the distance of the Stands and the rolling speed for the required Time is not sufficient, then can be advantageous Embodiment of the invention, the next roll stand opened so that to the next but one roll stand, in which then the second forming is done, enough time to Available. The opening of the roll stand closes his Use as a driver is not enough.

    Die weitere Umformung in den letzten Walzgerüsten der CSP-Walzstraße erfolgt dann bei Temperaturen unterhalb der Rekristallisations-Stop-Temperatur (TR), um den Austenit vor seiner polymorphen Umwandlung zu verfestigen. Die austenitverfestigende Umformung soll dabei einen Betrag von 30 % nicht unterschreiten. Die Endwalztemperatur liegt nahe bei der Ar3-Temperatur.The further forming in the last rolling stands of the CSP rolling mill then takes place at temperatures below the recrystallization stop temperature (TR) in order to solidify the austenite before its polymorphic transformation. The austenite-hardening forming should not be less than 30%. The finish rolling temperature is close to the A r3 temperature.

    Die polymorphe Umwandlung des Austenits erfolgt dann anschließend bei der abschließenden Kühlung in beispielsweise einer Laminarkühlstrecke bei einer Temperatur, die zwischen der Ar3-Temperatur (Temperatur der Austenit-Ferrit-Umwandlung) und der BS-Temperatur (Bainit-Starttemperatur) liegt.The polymorphic transformation of the austenite then takes place during the final cooling in, for example, a laminar cooling section at a temperature which lies between the A r3 temperature (temperature of the austenite-ferrite transformation) and the B S temperature (bainite starting temperature).

    Eine weitere Verbesserung der mechanischen Eigenschaften kann durch weitere gesteuerte Abkühlung des gewickelten Bundes, wobei insbesondere die Ausscheidungsvorgänge gezielt beeinflusst werden, erreicht werden. Can further improve the mechanical properties by further controlled cooling of the wound coil, with the elimination processes being specifically targeted be influenced, achieved.

    Die zweite Umformung, die gegebenenfalls erst im dritten Walzgerüst durchgeführt wird, kann gemäß der Erfindung bevorzugt der Auslösung eines zweiten Rekristallisationszyklus dienen, der zu einer weiteren Gefügefeinung und Gefügehomogenisierung führt, bevor neuerlich umgeformt wird. Zu diesem Zweck kann das nachfolgende Walzgerüst ebenfalls geöffnet werden, das dann gleichfalls bei Bedarf als Treiber genutzt werden kann. Die Temperatur liegt bei dieser zweiten Umformung gleichfalls oberhalb der TR-Temperatur.According to the invention, the second forming, which may only be carried out in the third roll stand, can preferably be used to initiate a second recrystallization cycle, which leads to further structural refinement and structural homogenization before the forming is carried out again. For this purpose, the subsequent mill stand can also be opened, which can then also be used as a driver if required. The temperature in this second transformation is also above the T R temperature.

    Eine Anlage zur Durchführung des Verfahrens der Erfindung besteht aus einer CSP-Anlage, in der gegossene Dünnbrammen im Direkteinsatz (ohne Zwischenkühlung und nachfolgendes Wiedererwärmen) in einer mehrgerüstigen CSP-Walzstaße umgeformt werden, und in der eine kontrollierte Gefügeentwicklung in der CSP-Walzstraße, in der Kühlstrecke und in der Haspel zur Erzielung optimaler mechanischer Eigenschaften am Warmbreitband möglich ist, wobei insbesondere zwischen der ersten und der zweiten Umformung sowie bei Bedarf auch zwischen der zweiten und der dritten Umformung eine für eine vollständige Rekristallisation erforderliche variable Zeitspanne einstellbar ist.A plant for carrying out the method of the invention consists of a CSP plant in which cast thin slabs in the Direct use (without intermediate cooling and subsequent Reheating) in a multi-stand CSP mill be reshaped, and in which a controlled Microstructure development in the CSP rolling mill, in the cooling section and in the reel to achieve optimal mechanical Properties on hot broadband is possible, in particular between the first and the second forming as well as if necessary also between the second and third forming one for a complete recrystallization required variable Period is adjustable.

    Nachfolgend wird anhand einer Zeichnungsfigur das Verfahren der Erfindung mit einem Fallbeispiel näher erläutert.The method is described below using a drawing figure the invention explained in more detail with a case study.

    In der Zeichnungsfigur ist eine CSP-Anlage dargestellt, in der ein etwa 6 mm starkes Warmbreitband aus hochfestem Baustahl durch thermomechanisches Walzen hergestellt wird.In the drawing figure, a CSP system is shown in the an approximately 6 mm thick hot strip made of high-strength structural steel is produced by thermomechanical rolling.

    Die aus der Gießanlage (1) austretenden Dünnbrammen (13) werden mit einer Schneidvorrichtung (2) in Walzlängen unterteilt und in einen Ausgleichsofen (3) eingeführt, in der sie auf eine Temperatur von etwa 1130 °C gebracht werden.The thin slabs (13) emerging from the casting plant (1) with a cutting device (2) in rolling lengths divided and introduced into a compensating furnace (3) in which they are brought to a temperature of about 1130 ° C.

    Die erste Umformung wird mit einer Stichabnahme von 50 % im ersten Walzgerüst (4) bei einer Umformtemperatur von 1080 °C durchgeführt. Um die gewünschte Rekristallisation vollständig bis zur zweiten Umformung zum Abschluss zu bringen, ist das zweite Walzgerüst (5) geöffnet und dient lediglich als Treiber.The first forming is carried out with a stitch reduction of 50% in the first roll stand (4) at a forming temperature of 1080 ° C carried out. To complete the desired recrystallization to complete by the second transformation is that second roll stand (5) opened and serves only as Driver.

    Die zweite Umformung wird dann im dritten Walzgerüst (6) mit einer Stichabnahme von 40 % bei einer Umformtemperatur von 1030 °C durchgeführt. Da hier die Umformung zu einer weiteren Rekristallisation genutzt wird, ist das nachfolgende vierte walzgerüst (7) gleichfalls geöffnet und dient nur als Treiber.The second forming is then carried out in the third roll stand (6) a stitch reduction of 40% at a forming temperature of 1030 ° C carried out. Since here the transformation to another Recrystallization is used, the following is fourth Roll stand (7) also opened and only serves as a driver.

    Die weiteren Umformstufen sind

    • dritte Umformung im fünften Walzgerüst (8) mit einer Stichabnahme von 30 % bei einer Umformtemperatur von 900 °C,
    • vierte Umformung im sechsten Walzgerüst (9) mit einer Stichabnahme von 25 % bei einer Umformtemperatur von 840 °C,
    • fünfte Umformung im siebten Walzgerüst (10) mit einer Stichabnahme von 15 % bei einer Umformtemperatur von 800 °C.
    The other forming stages are
    • third forming in the fifth roll stand (8) with a pass reduction of 30% at a forming temperature of 900 ° C,
    • fourth forming in the sixth roll stand (9) with a pass reduction of 25% at a forming temperature of 840 ° C,
    • fifth forming in the seventh roll stand (10) with a pass reduction of 15% at a forming temperature of 800 ° C.

    Danach wird das Warmbreitband in einer Laminar-Kühlstrecke (11) auf 600 °C (Haspeltemperatur) abgekühlt und in einer Unterflur-Haspelanlage (12) zu einem Bund aufgewickelt. Then the hot wide strip is in a laminar cooling section (11) cooled to 600 ° C (reel temperature) and in one Underfloor reel system (12) wound into a bundle.

    In der Zeichnungsfigur sind für die einzelnen Verfahrensschritte die entsprechenden Temperaturbereiche dargestellt. Die Zeitspanne (I) zwischen der ersten und der zweiten Umformung dient einer ersten Rekristallisationsphase, die Temperatur T ist dabei größer als die TR-Temperatur.The corresponding temperature ranges are shown in the drawing figure for the individual process steps. The time period (I) between the first and the second forming serves for a first recrystallization phase, the temperature T being greater than the T R temperature.

    Die Zeitspanne (II) zwischen der zweiten Umformung und der dritten Umformung dient der zweiten Rekristallisationsphase mit gleichfalls einer Temperatur T, die größer als die TR-Temperatur ist.The time period (II) between the second forming and the third forming serves the second recrystallization phase with a temperature T that is also greater than the T R temperature.

    Die Zeitspanne (III) von der dritten Umformung bis zur letzten Umformung dient der Verfestigung des Austenits mit einer Temperatur T zwischen der TR-Temperatur und der Ar3-Temperatur.The period of time (III) from the third transformation until the last transformation is used for solidification of the austenite at a temperature T between the T R temperature, and the A r3 temperature.

    Der Zeitraum (IV) nach der letzten Umformung, in der gekühlt wird, dient der polymorphen Umwandlung des Austenits. Die Temperatur T liegt hierbei zwischen der Ar3-Temperatur und der BS-Temperatur.The period (IV) after the last forming in which cooling is used serves for the polymorphic transformation of the austenite. The temperature T is between the A r3 temperature and the B S temperature.

    Die im obigen Fallbeispiel aufgeführten Parameter stellen nur mögliche Parameter für eine bestimmte Stahlsorte dar, wobei weitere Parameter, wie beispielsweise Walzendurchmesser, Walzgeschwindigkeit, Abstände der Walzgerüste voneinander mit zu berücksichtigen sind, um eine optimale Gefügebeeinflussung durch die thermomechanische Umformung zu erreichen.The parameters listed in the case example above only represent possible parameters for a certain steel grade, where other parameters, such as roll diameter, Rolling speed, distances of the roll stands from each other must be taken into account in order to optimize the microstructure to achieve by thermomechanical forming.

    Claims (4)

    1. Method of rolling hot wide strip from continuously cast thin slabs (13) of ferritic/pearlitic micro-alloyed constructional steels with a micro-alloying with vanadium and/or niobium and/or titanium in a compact strip production plant, wherein the cast slab strip (13), divided into roll lengths, is fed with cast structure by way of a compensating oven (3) of a multi-stand compact strip production rolling train (4 to 10), in which several roll stands are arranged directly one after the other without a preliminary stand and without an interposed thermal treating device, and continuously rolled out there into hot wide strip, cooled in a cooling path (11) and wound up into coils (12), wherein for attainment of optimum mechanical properties at the hot wide strip a controlled structural development is carried out by thermo-mechanical rolling during passage of the thin slabs through the compact strip production plant by the method steps:
      a) changing the cast structure by setting defined temperature and shape change conditions in the first reshaping (4), wherein the temperature lies above the recrystallisation strip temperature (TR) so that a complete (dynamic and/or metadynamic and/or static) recrystallisation of the cast structure takes place before the beginning of the second reshaping step (6), without interruption of the continuous rolling, during and/or after the first reshaping (4);
      b) reshaping in the last roll stands (8 to 10) at temperatures below the TR temperature, wherein the reshaping does not go below an amount of 30% and the final rolling temperature lies near the Ar3 temperature (temperature of the austenitic/ferritic conversion);
      c) controlled cooling of the hot wide strips in the cooling path (11), preferably a laminar cooling path, wherein the polymorphic conversion of the austenite takes place at a temperature which lies between the Ar3 temperature and the BS temperature (bainite start temperature).
    2. Method according to claim 1, characterised in that if needed the second roll stand (5) is opened for providing the time required for the recrystallisation of the first conversion and if needed is used only as a driver.
    3. Method according to claim 1 or 2, characterised in that after recrystallisation of the cast structure in consequence of the first shaping (4) a second recrystallisation is triggered by the second reshaping (6).
    4. Method according to claim 3, characterised in that the following roll stand (7) is opened for providing the time required for the recrystallisation by the second reshaping step (6) and if needed is used only as a driver.
    EP98110734A 1997-06-16 1998-06-12 Process for rolling wide hot strip in a compact strip production line Expired - Lifetime EP0885974B1 (en)

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    DE19725434C2 (en) 1999-08-19
    BR9801994A (en) 1999-10-13
    EP0885974A1 (en) 1998-12-23
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    AR012993A1 (en) 2000-11-22
    DE59801289D1 (en) 2001-10-04
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    ES2163830T3 (en) 2002-02-01
    CN1123403C (en) 2003-10-08

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