EP0873428A1 - Procede de laminage a chaud de feuillards d'acier - Google Patents

Procede de laminage a chaud de feuillards d'acier

Info

Publication number
EP0873428A1
EP0873428A1 EP97901001A EP97901001A EP0873428A1 EP 0873428 A1 EP0873428 A1 EP 0873428A1 EP 97901001 A EP97901001 A EP 97901001A EP 97901001 A EP97901001 A EP 97901001A EP 0873428 A1 EP0873428 A1 EP 0873428A1
Authority
EP
European Patent Office
Prior art keywords
strip
temperature
ferrite
steel
rolled
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.)
Ceased
Application number
EP97901001A
Other languages
German (de)
English (en)
Inventor
Manfred Espenhahn
Rudolf Kawalla
Hans Pircher
Waldemar Wolpert
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.)
Thyssen Stahl AG
Original Assignee
Thyssen Stahl AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thyssen Stahl AG filed Critical Thyssen Stahl AG
Publication of EP0873428A1 publication Critical patent/EP0873428A1/fr
Ceased legal-status Critical Current

Links

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
    • C21D8/0221—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
    • 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
    • C21D8/0294—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a localised treatment
    • 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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0426—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/04—Ferritic rolling
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • 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
    • C21D2221/00—Treating localised areas of an article
    • C21D2221/02—Edge parts
    • 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
    • C21D8/0231—Warm rolling

Definitions

  • the invention relates to a method for hot rolling strips of unalloyed or low-alloy steel, in particular ELC, ULC and IF steel, in one
  • Multi-frame finished series starting at a temperature in the austenite area of the steel and ending at a temperature in the ferrite area of the steel
  • ELC- Extra Low Carbon with 0.02 - 0.04% C
  • ULC- Ultra Low Carbon with ⁇ 0.005% C
  • IF - Interstitial Free through Nb and / or Ti addition
  • Ferrite rolling takes place, beginning and ending in the ferrite area of the steel, i.e. at a temperature below the A3 point of the steel.
  • Finishing scales due to the fact that the rolling stock has unfavorable texture components when the rolling temperature drops and the total thickness is reduced, which either cannot be corrected or can only be corrected by complex interventions in the frictional relationship between the roll and the rolling stock.
  • the third route is hot rolling, which partly takes place in the austenite area and partly in the ferrite area.
  • the hot strip runs into the finished section at a temperature in the austenite area of the steel.
  • the austenitic structure is then converted into the during the hot rolling in the finishing mill
  • the strip is then heated to a temperature in the ferrite region of the steel
  • the invention is based on the object
  • the strip is rolled austenitic to an intermediate thickness in the range from 2 to 12 mm in the finished season and then for
  • Ferrite transformation is cooled in a single cooling step, whereupon it is rolled ferritically to the final dimension in the finishing line.
  • the invention solves the task, because when
  • Austenite rolling up to an intermediate thickness in the range of 2 to 12 mm does not pose the risk of uncontrolled conversion of austenite into ferrite, which the disadvantages described in the rolling causes.
  • the ferrite rolling according to the invention which follows the structural change in a cooling section connected between the stands of the finished stack, in at least two stages takes advantage of the better deformability of the
  • the invention thus sees an advantageous division of the thickness reduction in the austenite region on the one hand and
  • the process according to the invention is intended to austenitically roll the strip to an intermediate thickness in the range from 3 to 8 mm and finish-roll ferritically to a final thickness of less than 1.5 mm.
  • the austenitically pre-rolled strip is to be ferritically rolled to the final dimension in at least 2 passes.
  • the strip is to be cooled at a speed of more than 30 ° C./s for ferrite conversion. This ensures intensive cooling of the steel strip, resulting in a complete phase transformation from austenite to ferrite that takes place within a short time.
  • the strip after passing through the cooling section for ferrite conversion, passes through a compensation section of a few meters in which a Temperature compensation between core and
  • the steel strip has enough time to complete the phase change over the cross section of the steel strip, which is particularly the case
  • the first section of finish rolling is carried out in the austenite area and that the brief cooling required for the phase change of the preliminary strip in the continuous rolling process takes place at an intermediate thickness in the range from 12 mm to 2 mm, preferably 8 to 3 mm. With this intermediate thickness, the necessary strip cooling is short-range and requires little coolant
  • Hot rolling is recorded in the ferrite area.
  • Austenite / ferrite conversion can take place without steering during rolling in the finishing mill.
  • the strip edges can be heated in order to compensate for any temperature losses there.
  • the method according to the invention can be used in conventional hot strip mills with continuous slab casting as the starting material and also in new types of continuous casting and rolling plants with a preliminary strip produced directly from the casting heat and strip processed further inline by rolling. Is the inventive method in
  • the heating temperature of the slabs can be selected according to the criteria of optimal product quality.
  • Pre-rolling and finish-rolling phases are avoided.
  • the blast furnace temperature is not required.
  • the preliminary strip has a temperature of usually more than 900 ° C. when it enters the finishing line. It has an austenitic structure over the entire thickness and width
  • the temperature jump is usually not more than 150 ° C for ELC steels, and usually not more than 80 ° C for ULC and IF steels.
  • the ferrite rolling is preferably carried out at a temperature between the Ar1 temperature and 150 ° C., preferably 100 ° C. below.
  • the finished rolled strip is cooled to a temperature of at least 10 ° C / s starting at the latest 2 s after the end of the rolling with liquid and / or gaseous cooling media, such as water and / or water-air mixtures, with a cooling rate in the core the Arl temperature falls below 150 ° C.
  • a hot strip produced in this way the structure of which was frozen by the abrupt cooling from the final roll temperature, that is to say is not recrystallized, is particularly suitable for the production of cold-rolled strip, preferably for cold forming by pressing and
  • the strip can also be kept after the hot rolling at a temperature which falls below the Ari temperature by less than 100 ° C. for the purpose of recrystallization, e.g. B. in the reel.
  • T rolling stock temperature after each pass
  • Vw belt speed
  • the austenite / ferrite microstructure transformation takes place in the method according to the invention when a strip thickness of 5 mm is reached after the second pass through targeted cooling.
  • the temperature drops from 870 ° C after the second stitch to around 800 ° C before the third stitch.
  • the final thickness is reached after the fifth and last stitch in the finished season.
  • the procedure according to the invention can also be practiced in existing systems by installing a cooling section.
  • the existing systems thus supplemented can be used at full capacity, not only for the method according to the invention, but also for all conventional hot rolling programs.
  • Fig. 1 shows the temperature dependence of
  • the temperature interval in which the phase change of the ELC steel takes place is indicated in FIG. 1.
  • the favorable temperature range is approx. 100 to 150 ° C.
  • Fig. 2 shows a section of the
  • Fig. 2 shows the last stand F2 of the first part of the finishing stage, in which the austenite rolling is carried out, behind the cooling section, in which cooling to carry out the austenite / ferrite phase transformation in the steel strip and then the stand F3 as the first stand of the last Section of the finishing line, which should advantageously contain two, better three roll stands, in which the ferrite rolling is carried out.

Landscapes

  • 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 Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

L'invention concerne un procédé de laminage à chaud de feuillards constitués d'un acier non allié ou faiblement allié, en particulier un acier à teneur en carbone très basse, à teneur en carbone ultra basse et exempt d'interstitiels, dans un groupe finisseur à plusieurs plages. Ledit procédé commence à une température comprise dans la plage austénitique de l'acier et se termine à une température comprise dans la plage ferritique de l'acier. La transformation structurale de l'acier est terminée par refroidissement du feuillard entre des cages du groupe finisseur. L'invention se caractérise en ce que le feuillard est laminé dans sa phase austénitique de façon à prendre une épaisseur intermédiaire comprise entre 2 et 12 millimètres, puis est refroidi pour prendre l'état ferritique en une seule étape de refroidissement, et ensuite laminé à sa dimension définitive en phase ferritique.
EP97901001A 1996-01-14 1997-01-11 Procede de laminage a chaud de feuillards d'acier Ceased EP0873428A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19600990A DE19600990C2 (de) 1996-01-14 1996-01-14 Verfahren zum Warmwalzen von Stahlbändern
DE19600990 1996-01-14
PCT/EP1997/000107 WO1997026377A1 (fr) 1996-01-14 1997-01-11 Procede de laminage a chaud de feuillards d'acier

Publications (1)

Publication Number Publication Date
EP0873428A1 true EP0873428A1 (fr) 1998-10-28

Family

ID=7782645

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97901001A Ceased EP0873428A1 (fr) 1996-01-14 1997-01-11 Procede de laminage a chaud de feuillards d'acier

Country Status (8)

Country Link
EP (1) EP0873428A1 (fr)
JP (1) JP2000503345A (fr)
KR (1) KR19990077215A (fr)
AU (1) AU1440897A (fr)
CA (1) CA2242728A1 (fr)
DE (1) DE19600990C2 (fr)
MX (1) MX9805594A (fr)
WO (1) WO1997026377A1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1007739C2 (nl) * 1997-12-08 1999-06-09 Hoogovens Staal Bv Werkwijze en inrichting voor het vervaardigen van een stalen band met hoge sterkte.
NL1003293C2 (nl) 1996-06-07 1997-12-10 Hoogovens Staal Bv Werkwijze en inrichting voor het vervaardigen van een stalen band.
DE19632448A1 (de) * 1996-08-05 1998-02-12 Mannesmann Ag Verfahren und Anlage zur Herstellung von Band aus niedriggekohlten und ultraniedriggekohlten Stählen
TR199901967T2 (xx) * 1996-12-19 2000-07-21 Hoogovens Staal Bv. Bir �elik �erit veya sac haz�rlamak i�in i�lem ve tertibat.
DE19712616C2 (de) * 1997-03-26 1999-07-15 Thyssen Stahl Ag Warmwalzen von Stahlband
NL1007731C2 (nl) * 1997-12-08 1999-06-09 Hoogovens Staal Bv Werkwijze en inrichting voor het vervaardigen van een ferritisch gewalste stalen band.
DE19758108C1 (de) * 1997-12-17 1999-01-14 Mannesmann Ag Produktionsverfahren und -anlage zur endlosen Erzeugung von warmgewalzten dünnen Flachprodukten
DE19807122C2 (de) 1998-02-20 2000-03-23 Thyssenkrupp Stahl Ag Verfahren zur Herstellung von nichtkornorientiertem Elektroblech
AU3059599A (en) * 1998-03-27 1999-10-18 Corus Staal B.V. Method for manufacturing a forming steel having good forming characteristics andlow-carbon grade forming steel
IT1303873B1 (it) * 1998-11-26 2001-03-01 Demag Italimpianti Spa Laminatoio a caldo per nastri sottili
DE19858073C2 (de) * 1998-12-16 2003-04-24 Max Planck Inst Eisenforschung Verfahren zur Erzeugung von dünnen Warmbändern aus Stahl mit verbesserter Tiefziehfähigkeit
BE1012462A3 (fr) * 1999-02-05 2000-11-07 Centre Rech Metallurgique Procede de fabrication d'une bande d'acier laminee a chaud pour emboutissage.
ITRM20060262A1 (it) * 2006-05-17 2007-11-18 Ct Sviluppo Materiali Spa Procedimento per la produzione di nastri di acciaio al carbonio a grano fine e nastri cosi ottenibili
AT509707B1 (de) * 2010-05-04 2011-11-15 Siemens Vai Metals Tech Gmbh Verfahren zum warmwalzen von stahlbändern und warmwalzstrasse
EP4364867A1 (fr) * 2022-11-04 2024-05-08 Primetals Technologies Austria GmbH Laminage d'acier avec détection technique de mesure de la conversion de phase

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE807881R (fr) * 1973-11-27 1974-05-27 Centre Rech Metallurgique Procede pour la fabrication de toles pour emboutissage
LU78401A1 (fr) * 1977-10-27 1979-06-01 Centre Rech Metallurgique Procede de fabrication d'un acier formable a froid
BE901292A (fr) * 1984-12-17 1985-06-17 Centre Rech Metallurgique Procede de laminage controle d'un produit epais.
NL8702050A (nl) * 1987-09-01 1989-04-03 Hoogovens Groep Bv Werkwijze en inrichting voor de vervaardiging van bandvormig vervormingsstaal met goede mechanische en oppervlakte-eigenschappen.
US5200005A (en) * 1991-02-08 1993-04-06 Mcgill University Interstitial free steels and method thereof
NL9100911A (nl) * 1991-03-22 1992-10-16 Hoogovens Groep Bv Inrichting en werkwijze voor het vervaardigen van warmgewalst staal.
DE69227548T2 (de) * 1991-07-17 1999-07-29 Centre Rech Metallurgique Verfahren zur Herstellung eines dünnen Bandes aus Weichstahl

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9726377A1 *

Also Published As

Publication number Publication date
DE19600990A1 (de) 1997-07-17
KR19990077215A (ko) 1999-10-25
JP2000503345A (ja) 2000-03-21
MX9805594A (es) 1998-10-31
DE19600990C2 (de) 1997-12-18
AU1440897A (en) 1997-08-11
WO1997026377A1 (fr) 1997-07-24
CA2242728A1 (fr) 1997-07-24

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