EP1112128B1 - Procede de production de feuillard a chaud et de toles - Google Patents

Procede de production de feuillard a chaud et de toles Download PDF

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Publication number
EP1112128B1
EP1112128B1 EP99969051A EP99969051A EP1112128B1 EP 1112128 B1 EP1112128 B1 EP 1112128B1 EP 99969051 A EP99969051 A EP 99969051A EP 99969051 A EP99969051 A EP 99969051A EP 1112128 B1 EP1112128 B1 EP 1112128B1
Authority
EP
European Patent Office
Prior art keywords
slab
temperature
transformation
continuous casting
cooling
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
EP99969051A
Other languages
German (de)
English (en)
Other versions
EP1112128A1 (fr
Inventor
Udo Falkenreck
Uwe Quitmann
Harald Wehage
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
Original Assignee
SMS Demag 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 SMS Demag AG filed Critical SMS Demag AG
Publication of EP1112128A1 publication Critical patent/EP1112128A1/fr
Application granted granted Critical
Publication of EP1112128B1 publication Critical patent/EP1112128B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • B21B45/02—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 lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • 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
    • B21B1/30—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 non-continuous process
    • B21B1/32—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 non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
    • B21B1/34—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 non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by 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

Definitions

  • the invention relates to a method for producing hot strip and sheets a production line consisting of a continuous caster for slabs a thickness between 100 and 180 mm and with an exit temperature from the Continuous caster above 1000 ° C, one heating furnace and one Steckel rolling mill.
  • FFM Flexible Flat Mill
  • the temperature of the slab is usually after leaving the Continuous caster between 1000 ° C and 1150 ° C and decreases during the Transport to the heating furnace on the roller table.
  • the direct hot use in the Heating oven takes place at temperatures between 750 and 950 ° C.
  • the slab evenly across thickness, width and length depending on material Temperatures warmed between 1050 and 1280 ° C.
  • Characteristic for hot use is the fact that before the first forming No or only a slight austenite-ferrite / pearlite conversion in the rolling mill via the slab thickness takes place in the near-surface area when the Surface temperatures are the transition temperatures when transporting the Slab from the continuous caster to the heating furnace not or only slightly and fell short of.
  • the one created with the solidification of the slab Coarse-grained primary austenite remains predominantly in the rolling mill until it is formed receive.
  • the austenite grain size in the heating furnace can vary depending on the material Heating technology is still growing.
  • the method of hot use leads to savings compared to cold use of heating energy and time during the heating process.
  • the described method of hot use has proven itself for steels with a Copper content less than 0.3%. At higher copper contents in the steel, this settles copper released in the heating furnace at the grain boundaries of the Primary austits. Depending on the copper content, the heating temperature and These copper deposits on the grain boundaries during the scaling process Forming in the rolling mill into material separations in the form of net-like cracks to lead.
  • EP 0686702 A1 it is proposed to solve the problem occurring in thin-slab casting and rolling plants, the surface of 40 - lower 70 mm-thick thin slabs in one of the continuous casting plant downstream cooling zone to temperatures below the A r3 temperature such that, in a near-surface region of at least 2 mm depth, there is at least a 70% structural transformation of the austenite into ferrite / pearlite with reorientation of the austenite limits after reheating in the roller hearth furnace.
  • an average surface temperature should not fall below the martensite threshold of the respective material quality.
  • the devices for rapid cooling are localized in the prior art between the continuous caster and the heating or equalizing furnace proposed.
  • the partial conversion of the surface layer into Ferrite / pearlite is with a grain refinement and reorientation of the austenite grain boundaries connected after reheating, as in Figures 1b and 2, also on the course of solid line representing the state of the art can be seen.
  • the object of the present invention is to ensure that in a combined Hot strip / sheet metal production system of the generic type described also Steels with higher contents of Cu, Al and N can be processed without disadvantages can.
  • the surface is completely descaled in the scale washer.
  • the slab is formed with a total decrease of 5-15% and with a diameter-optimized roll gap ratio l d / h m less than 0.8.
  • the rolling speed corresponds to the casting speed.
  • the proposed roll gap ratio of the pressed length to the medium rolling stock height is set such that, according to another feature of the invention, the area near the surface corresponds to a thickness of at most a quarter of the slab thickness by choosing the decrease and the roll gap ratio. while the core area remains almost undeformed.
  • the intensity of the cooling section is controlled and regulated so that the surface temperature of the slab neither reaches the bainite area nor falls below the martensite threshold of the respective material quality.
  • control and regulation systems Media pressure of the nozzle groups of the cooling section depending on the respective Slab thickness and casting speed, the average temperature of the surface layer close to the surface in compliance with for a 100% Microstructure transformation necessary cooling temperature and time as well as the Bainite start temperature and the martensite start temperature of the respective material quality regulate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Claims (5)

  1. Procédé pour fabriquer des feuillards chauds et des tôles dans une installation de production, constituée d'une installation de coulée continue pour des brames entre 100 et 180 mm d'épaisseur, d'un dispositif de lavage de calamine, d'une unité de cylindres à une ou plusieurs cages avec ou sans accumulateur intégré, d'une étendue de refroidissement, d'un four de chauffage, et d'un laminoir Steckel,
    caractérisé en ce que, entre l'installation de coulée continue et le four de chauffage, uniquement la couche marginale proche de la surface de la brame précédemment décalaminée est déformée en ligne, recristallisée pendant et après la déformation et, ensuite, refroidie en plusieurs étapes à une température au-dessous du point de transformation Ar3 et y est maintenue temporairement jusqu'à ce que la transformation de structure de l'austénite à grains fins recristallisée en ferrite/perlite soit terminée.
  2. Procédé selon la revendication 1,
    caractérisé en ce que la brame est déformée avec une diminution globale de 5-15% et avec un rapport d'emprise des cylindres optimisé en diamètre ld/hm inférieur à 0,8.
  3. Procédé selon les revendications 1 et 2,
    caractérisé en ce que la zone proche de la surface déformée, par choix de la diminution et du rapport de l'emprise des cylindres, correspond à une épaisseur d'au maximum un quart de l'épaisseur de la brame.
  4. Procédé selon les revendications 1 et 3,
    caractérisé en ce que l'intensité de l'étendue de refroidissement constituée de plusieurs groupes de buses est commandée et réglée de sorte que la température de surface de la brame n'atteint pas le domaine bainitique ni ne reste inférieure au seuil de martensite de la qualité de matière respective.
  5. Procédé selon les revendications 1 et 4,
    caractérisé en ce que des systèmes de commande et de réglage régulent la pression de l'agent des groupes de buses de l'étendue de refroidissement de façon dépendant de la vitesse de coulée et de l'épaisseur de brame respectives, de la température moyenne de la couche marginale proche de la surface en maintenant la température de refroidissement nécessaire pour une transformation de structure à 100 % et une durée de refroidissement correspondante, ainsi que de la température de début de bainite et de la température de début de martensite de la qualité de matière respective.
EP99969051A 1998-09-14 1999-09-08 Procede de production de feuillard a chaud et de toles Expired - Lifetime EP1112128B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19843200A DE19843200C1 (de) 1998-09-14 1998-09-14 Verfahren zur Erzeugung von Warmband und Blechen
DE19843200 1998-09-14
PCT/DE1999/002866 WO2000015362A1 (fr) 1998-09-14 1999-09-08 Procede de production de feuillard a chaud et de toles

Publications (2)

Publication Number Publication Date
EP1112128A1 EP1112128A1 (fr) 2001-07-04
EP1112128B1 true EP1112128B1 (fr) 2003-01-02

Family

ID=7881679

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99969051A Expired - Lifetime EP1112128B1 (fr) 1998-09-14 1999-09-08 Procede de production de feuillard a chaud et de toles

Country Status (10)

Country Link
US (1) US6451136B1 (fr)
EP (1) EP1112128B1 (fr)
CN (1) CN1142038C (fr)
AT (1) ATE230315T1 (fr)
AU (1) AU1149200A (fr)
CA (1) CA2344423C (fr)
DE (2) DE19843200C1 (fr)
ES (1) ES2186438T3 (fr)
RU (1) RU2224605C2 (fr)
WO (1) WO2000015362A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2951198B1 (fr) * 2009-10-12 2013-05-10 Snecma Traitements thermiques d'aciers martensitiques inoxydables apres refusion sous laitier
DE102013212951A1 (de) 2013-07-03 2015-01-22 Sms Siemag Ag Gießwalzanlage und Verfahren zum Herstellen von metallischem Walzgut
CN105195700A (zh) * 2014-06-23 2015-12-30 鞍钢股份有限公司 一种避免直装轧制厚板表面裂纹的方法
RU2660504C1 (ru) * 2017-05-10 2018-07-06 Николай Петрович Белокопытов Способ производства широких толстых листов из нержавеющих сталей
EP3769862A1 (fr) * 2019-07-24 2021-01-27 Primetals Technologies Austria GmbH Procédé de fabrication d'une bande finie à emboutir d'acier dans une installation combinée de laminage en coulée continue
CN111876664B (zh) * 2020-06-19 2022-04-12 江阴兴澄特种钢铁有限公司 一种50CrVA热轧弹簧宽钢板的制造方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58164751A (ja) * 1982-03-23 1983-09-29 Daido Steel Co Ltd 冷間鍛造用鋼およびその製造方法
JPS59189001A (ja) * 1983-04-08 1984-10-26 Sumitomo Electric Ind Ltd 鋼の熱片直送圧延方法
JPS62212001A (ja) * 1986-03-13 1987-09-18 Sumitomo Metal Ind Ltd 鋼片の表面割れを防止した熱間圧延法
JPS63168260A (ja) * 1986-12-30 1988-07-12 Aichi Steel Works Ltd 連続鋳造片の熱間加工法
JPH0688125A (ja) * 1992-09-09 1994-03-29 Aichi Steel Works Ltd 連続鋳造片及び鋼塊の熱間加工法
US5464246A (en) * 1993-02-19 1995-11-07 Simula Inc. Inflatable tubular cushions for crash protection of seated automobile occupants
ES2181698T3 (es) * 1993-10-29 2003-03-01 Danieli Off Mecc Metodo para el tratamiento termico de superficie en una maquina de colada continua y dispositivo correspondiente.
DE4416752A1 (de) * 1994-05-13 1995-11-16 Schloemann Siemag Ag Verfahren und Produktionsanlage zur Erzeugung von Warmbreitband

Also Published As

Publication number Publication date
DE19843200C1 (de) 1999-08-05
ATE230315T1 (de) 2003-01-15
RU2224605C2 (ru) 2004-02-27
WO2000015362A1 (fr) 2000-03-23
AU1149200A (en) 2000-04-03
DE59903924D1 (de) 2003-02-06
CN1317999A (zh) 2001-10-17
CA2344423C (fr) 2007-09-04
EP1112128A1 (fr) 2001-07-04
ES2186438T3 (es) 2003-05-01
CN1142038C (zh) 2004-03-17
CA2344423A1 (fr) 2000-03-23
US6451136B1 (en) 2002-09-17

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