EP0885974B1 - Procédé pour le laminage de bandes larges à chaud dans une installation compacte de production de bandes - Google Patents

Procédé pour le laminage de bandes larges à chaud dans une installation compacte de production de bandes 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
Authority
EP
European Patent Office
Prior art keywords
temperature
rolling
strip
reshaping
recrystallisation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98110734A
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German (de)
English (en)
Other versions
EP0885974A1 (fr
Inventor
Karl-Ernst Dr. Ing. Habil. Hensger
Robert Bs Met. Eng R Mba Davis
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.)
SMS Siemag AG
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SMS Demag AG
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Publication date
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP0885974A1 publication Critical patent/EP0885974A1/fr
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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
    • B21B1/26—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)

Claims (4)

  1. Procédé pour le laminage de bandes larges à chaud à partir de brames minces de coulée continue (13) en acier de construction ferritique-perlitique microallié avec un microalliage de vanadium et/ou de niobium et/ou de titane dans une installation du type CSP ("Compact Strip Production"), dans lequel la brame coulée (13), subdivisée en longueurs à laminer, est amenée via un four de compensation (3) à un train de laminage (4-10) du type CSP à plusieurs cages, dans lequel sont agencées plusieurs cages de laminage sans cage préliminaire immédiatement les unes derrière les autres et sans dispositif de traitement thermique intermédiaire, avec la structure résultant de la coulée, et est laminée en continu dans ce train de laminage pour former une bande large à chaud, refroidie dans un trajet de refroidissement (11) puis enroulée (12) en bobine, dans lequel, afin d'atteindre des propriétés mécaniques optimum au niveau de la bande large à chaud, on procède par laminage thermo-mécanique à un développement contrôlé de la structure lors de la traversée de la brame mince à travers l'installation CSP, avec les opérations de procédé suivantes :
    a) on modifie la structure résultant de la coulée en établissant des conditions définies de température et de modification de forme lors de la première déformation (4), la température étant située au-dessus de la température d'arrêt de recristallisation (TR), de sorte que sans interruption du laminage continu pendant et/ou après la première déformation (4) se produit une recristallisation complète (dynamique et/ou méta-dynamique et/ou statique) de la structure résultant de la coulée avant le commencement de la deuxième opération de déformation (6) ;
    b) on déforme dans les dernières cages de laminage (8-10) à des températures au-dessous de la température TR, cette déformation ne passant pas au-dessous d'une valeur de 30 %, et la température de laminage final est proche de la température Ar3 (température de la transformation austénite/ferrite) ;
    c) on refroidit de façon commandée les bandes larges à chaud dans le trajet de refroidissement (11), de préférence un trajet de refroidissement laminaire, de sorte que vers une température située entre la température Ar3 et à la température BS (température de départ de la bainite), se produit la transformation polymorphe de l'austénite.
  2. Procédé selon la revendication 1, caractérisé en ce que, en cas de besoin, pour ménager le temps nécessaire pour la recristallisation de la première transformation, on ouvre la deuxième cage de laminage (5) et on l'utilise si besoin uniquement comme entraínement.
  3. Procédé selon l'une ou l'autre des revendications 1 et 2, caractérisé en ce qu'après la recristallisation de la structure résultant de la coulée à la suite de la première déformation (4) on déclenche par la deuxième déformation (6) un deuxième cycle de recristallisation.
  4. Procédé selon la revendication 3, caractérisé en ce que pour ménager le temps nécessaire pour la recristallisation par la deuxième opération de déformation (6), on ouvre la cage de laminage suivante (7) et on l'utilise si besoin uniquement comme entraínement.
EP98110734A 1997-06-16 1998-06-12 Procédé pour le laminage de bandes larges à chaud dans une installation compacte de production de bandes Expired - Lifetime EP0885974B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19725434 1997-06-16
DE19725434A DE19725434C2 (de) 1997-06-16 1997-06-16 Verfahren zum Walzen von Warmbreitband in einer CSP-Anlage

Publications (2)

Publication Number Publication Date
EP0885974A1 EP0885974A1 (fr) 1998-12-23
EP0885974B1 true EP0885974B1 (fr) 2001-08-29

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Country Link
US (1) US6030470A (fr)
EP (1) EP0885974B1 (fr)
JP (1) JP4208101B2 (fr)
CN (1) CN1123403C (fr)
AR (1) AR012993A1 (fr)
AT (1) ATE204916T1 (fr)
BR (1) BR9801994A (fr)
DE (2) DE19725434C2 (fr)
EG (1) EG21540A (fr)
ES (1) ES2163830T3 (fr)

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DE3637893C2 (de) * 1986-11-06 1996-02-08 Schloemann Siemag Ag Verfahren und Anlage zur Herstellung von warmgewalztem Stahlband und Bandgießanlage
JPH07110364B2 (ja) * 1988-06-01 1995-11-29 三菱重工業株式会社 連続鋳造薄スラブの圧延方法
DE3837642A1 (de) * 1988-11-05 1990-05-17 Schloemann Siemag Ag Verfahren und vorrichtung zur herstellung von warmgewalzten stahlbaendern
JPH02235502A (ja) * 1989-03-06 1990-09-18 Sumitomo Metal Ind Ltd 熱間連続圧延方法及びその設備
DE3926459A1 (de) * 1989-08-10 1991-02-14 Schloemann Siemag Ag Verfahren und anlage zur herstellung von thermomechanisch behandeltem walzgut aus stahl
DE4236307A1 (de) * 1992-10-28 1994-05-05 Schloemann Siemag Ag Verfahren und Anlage zur Herstellung von warmgewalztem Stahlband, insbesondere aus bandförmig stranggegossenem Vormaterial
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Also Published As

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DE19725434C2 (de) 1999-08-19
DE19725434A1 (de) 1998-12-24
JP4208101B2 (ja) 2009-01-14
DE59801289D1 (de) 2001-10-04
AR012993A1 (es) 2000-11-22
ATE204916T1 (de) 2001-09-15
JPH1177102A (ja) 1999-03-23
CN1207965A (zh) 1999-02-17
CN1123403C (zh) 2003-10-08
ES2163830T3 (es) 2002-02-01
US6030470A (en) 2000-02-29
BR9801994A (pt) 1999-10-13
EG21540A (en) 2001-11-28
EP0885974A1 (fr) 1998-12-23

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