WO1992022389A1 - Procede et installation de fabrication de bobines de feuillards ayant des caracteristiques de feuillards lamines a froid mais obtenus directement dans une chaine de laminage a chaud - Google Patents

Procede et installation de fabrication de bobines de feuillards ayant des caracteristiques de feuillards lamines a froid mais obtenus directement dans une chaine de laminage a chaud Download PDF

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Publication number
WO1992022389A1
WO1992022389A1 PCT/EP1991/001127 EP9101127W WO9222389A1 WO 1992022389 A1 WO1992022389 A1 WO 1992022389A1 EP 9101127 W EP9101127 W EP 9101127W WO 9222389 A1 WO9222389 A1 WO 9222389A1
Authority
WO
WIPO (PCT)
Prior art keywords
rolling
hot
product
cold
strip
Prior art date
Application number
PCT/EP1991/001127
Other languages
German (de)
English (en)
Inventor
Christian Caesar
Ingo Von Hagen
Fritz-Peter Pleschiutschnigg
Lothar Parschat
Original Assignee
Mannesmann 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 Mannesmann Ag filed Critical Mannesmann Ag
Priority to PCT/EP1991/001127 priority Critical patent/WO1992022389A1/fr
Publication of WO1992022389A1 publication Critical patent/WO1992022389A1/fr

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
    • 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
    • B21B1/463—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 continuous process, i.e. the cast not being cut before 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
    • C21D8/021—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
    • 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
    • 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
    • C21D8/0221—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
    • 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
    • C21D8/0236—Cold rolling

Definitions

  • the present invention relates to a process and relevant plant for producing coils of steel strips, having characteristics of a cold-rolled product and directly obtained in a hot-rolling line from a continuous casting with arc-shaped path and hori ⁇ zontal outlet.
  • the actual cold-rolling step which comprises mounting the coil onto an unwinding reel to bring again the strip onto a plane, causing the strip to pass through at least one cold-rolling stand until obtaining thicknesses of less than 1 mm, down to 0.5-0.2 mm and finally winding the strip on a reel to obtain the final coil.
  • the number of paths in the stands for cold-rolling depends on the desired final thickness and the reduction percentage which is to be obtained, in other words the ratio between thick ⁇ ness of the hot-rolled strip and thickness of the final product. For high values of such a percentage reduction it is not enough to increase the number of said paths, but it will be necessary to subject the strip to another annealing operation and the consequent pickling, otherwise the material hardens and final product results to be of low quality.
  • Attemps have been described as to making plants for obtaining thin strips by means of more compact operating cycles with respect to the above-mentioned conventional cycle, in order to reduce complexity and duration of the latter.
  • EP-A-226446 describes a number of hot-rolling examples, all in line and at a very high speed (not less than 1500 mm/min) but the final product not only has a thick ⁇ ness of 2-6 mm, falling thereby in the range of hot-rolling, but also certainly does not show the structural features of a cold-rolled product.
  • the main purpose of this application is in fact restricted to a high productivity while obtaining at the same time a product of good processability , but not of high quality.
  • EP-370 575 there is described a method for the manufacture of a steel strip having a final thick ⁇ ness of between 0.5 and 1.5 mm, comprising the steps of hot-rolling a steel slab of less than 100 mm thickness, at a temperature of between 300 C and a temperature at which at least 75% of the material is converted into ferrite, with a thickness reduction of over 30% in at least one reduction stage, and an exit speed after hot-rolling of less than 1000 m/min, with final coiling of the strip after recrystallization.
  • SUBSTITUTE SHEET hot-rolling line results to be suitable to cold- rolling, even if its temperature is caused to be lower than recrystallization point Ar grasp .
  • the plant for carrying out such a process will consist essentially of the plant described and claimed in the above-mentioned PCT patent application until exit of the last hot-rolling stand, being further characterized by a cooling and temperature controlling device, by one or more cold-rolling stands and a final strip coiling reel.
  • the expected tempe ⁇ rature at the outlet from the controlled cooling device is always less than that of recrystalli- zation point Ar grasp , which varies according to the carbon content in the Steel, with a minimum of 690 C for 0.6% of carbon, up to a maximum of 900 C for lower or higher carbon contents. Therefore it is certain that the subsequent processing is actually a cold-rolling step, which is carried out on a material the inner structure of which has all the required characteristics in order that the cold- rolling operation is accomplished in the best way and the final product is provided, from a metallur- gical point of view, with all the properties which are required to a cold-rolled product.
  • the steel flat product 1 driven and guided by a known-type roller path being arc-shaped, from an initially vertical direction, passes through the arc-shaped path formed by the rollers 11, to a horizontal direction, the thickness of the casting product 1 is firstly reduced in a condition of liquid core, for example in two distinct sections of rollers 13 and thereafter, upon solidification, but still at a temperature of about 1100°C, in a first stage of rolling 15 at the end of the bent path 11 and at the beginning of the horizontal path.
  • an induction oven 21 the flat product 1 is reheated to bring it again to hot-rolling temperature, and then rolled in one or more rolling stands 27, between which there may be possibly provided ad ⁇ ditional induction ovens (not shwon in the drawing) for maintaining the rolling temperature of at least 865 C at the outlet from the stand.
  • this first portion of the plant substantially already known from WO 89/11363, immediately after the first rolling stage 15 there may be provided a shear 17 and before said stage 15 a discaling device 19 for eliminating scale from the surface of the product to be treated. Furthermore, between the induction oven 21 and the hot-rolling stands 27 there may be provided a winding and unwinding device 23 compri ⁇ sing a reel 22 for coiling the strip from oven 21, being coupled to a reel 24 for uncoiling the strip itself to be fed to stands 27, possibly after an additional discaling step in a suitable device 25 provided at the inlet of the first rolling stand.
  • the hot-rolling strip 21, at the outlet of the last rolling stand 27 at a temperature certainly higher than the recrystallization point Ar 3 is caused to enter, still in the same production line, as cooling and temperature controlling apparatus 29, at the exit of which the strip has a temperature, controllable at each time, comprised in a range of between 250 and 600 C.
  • It substantially consists of a water- based cooling device, for example of the so-called "laminar rain” type, being provided with a tempe ⁇ rature detector with a feed-back controlling the valves for feeding water into the device.
  • Such a rolling occurs in at least one stand, for example of "six high” type, i.e. with six rolls mounted in vertical.
  • the passes of cold-rolling may however be more than one, but all in series when providing a multiplicity of stand side by side, contrary to the method of providing for a multi ⁇ plicity of subsequent passes in the same stands, as according to the concentional technology of cold- rolling.
  • the cold-rolling strip with a thickness of less than 1 mm, ready for use as it shows the tipical microcrystalline features of a cold- rolled product, such as a homogeneous distribution of grains, is coiled on a final reel 33.
  • the lower limit of the thickness than can be obtained in this way will be only dictated by the nip of the cold- rolling stands 31, as well as their precision, not certainly by problems of material hardening or anyhow deriving from its metallurgical structure.

Abstract

Un procédé de fabrication de bobines de feuillards ayant des caractéristiques de produits laminés à froid mais qui sont directement obtenus dans une chaîne de laminage à chaud comprend deux étapes ultérieures de coulée et de réduction de l'épaisseur à une température supérieure à 1100 °C lors de la solidification, l'échauffement par induction du produit et une étape additionnelle de laminage à chaud à une température supérieure au point Ar3, une étape de refroidissement et d'ajustement de la température dans une plage comprise entre 600 et 250 °C, donc inférieure audit point Ar3, ainsi qu'un ou plusieurs passages de laminage à froid en série, puis le bobinage final du produit ainsi obtenu. Une installation préférée de mise en ÷uvre de ce procédé est également décrite.
PCT/EP1991/001127 1991-06-18 1991-06-18 Procede et installation de fabrication de bobines de feuillards ayant des caracteristiques de feuillards lamines a froid mais obtenus directement dans une chaine de laminage a chaud WO1992022389A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP1991/001127 WO1992022389A1 (fr) 1991-06-18 1991-06-18 Procede et installation de fabrication de bobines de feuillards ayant des caracteristiques de feuillards lamines a froid mais obtenus directement dans une chaine de laminage a chaud

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1991/001127 WO1992022389A1 (fr) 1991-06-18 1991-06-18 Procede et installation de fabrication de bobines de feuillards ayant des caracteristiques de feuillards lamines a froid mais obtenus directement dans une chaine de laminage a chaud

Publications (1)

Publication Number Publication Date
WO1992022389A1 true WO1992022389A1 (fr) 1992-12-23

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Country Status (1)

Country Link
WO (1) WO1992022389A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU675099B2 (en) * 1993-02-16 1997-01-23 Voest-Alpine Industrieanlagenbau Gmbh Process for the production of a strip, a pre-strip or a slab
US5632177A (en) * 1994-03-01 1997-05-27 Hitachi, Ltd. System and method for manufacturing thin plate by hot working
WO1998000248A1 (fr) * 1996-06-28 1998-01-08 Hoogovens Staal B.V. Procede et installation pour la fabrication d'une bande ou d'une feuille d'acier d'emboutissage profond
GB2322320A (en) * 1997-02-21 1998-08-26 Kvaerner Metals Cont Casting Continuous casting with rolling stages separated by a temperature controlling stage
US5832985A (en) * 1994-10-20 1998-11-10 Mannesmann Aktiengesellschaft Process and device for producing a steel strip with the properties of a cold-rolled product
WO2007010565A1 (fr) * 2005-07-19 2007-01-25 Giovanni Arvedi Processus et installation afferente pour fabriquer des produits allonges en acier sans interruption
WO2007072516A1 (fr) * 2005-12-22 2007-06-28 Giovanni Arvedi Procede et installation associee pour la production de bandes d'acier avec solution de continuite
US8162032B2 (en) 2005-07-19 2012-04-24 Giovanni Arvedi Process and plant for manufacturing steel plates without interruption
CN103111466A (zh) * 2012-12-29 2013-05-22 东北大学 一种双辊连铸薄带异步热轧工艺制备取向硅钢的方法
CN110997169A (zh) * 2017-08-04 2020-04-10 东芝三菱电机产业系统株式会社 无头轧制线的温度控制装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1903554A1 (de) * 1968-01-24 1969-08-28 Sumitomo Metal Ind Verfahren zur Herstellung von warmgewalztem Bandstahl
JPS56144805A (en) * 1980-04-15 1981-11-11 Nippon Kokan Kk <Nkk> Direct rolling apparatus
EP0226446A2 (fr) * 1985-12-12 1987-06-24 Kawasaki Steel Corporation Procédé pour produire des bandes laminées minces à bonne formabilité
EP0306076A1 (fr) * 1987-09-01 1989-03-08 Hoogovens Groep B.V. Fabrication de bandes d'acier formables
WO1989011363A1 (fr) * 1988-05-26 1989-11-30 Mannesmann Ag Procede pour produire en continu du feuillard d'acier ou de la tole d'acier a partir de produits plats fabriques selon le procede de coulee continue en arc
EP0370575A1 (fr) * 1988-11-24 1990-05-30 Hoogovens Groep B.V. Procédé pour la fabrication d'acier déformable

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1903554A1 (de) * 1968-01-24 1969-08-28 Sumitomo Metal Ind Verfahren zur Herstellung von warmgewalztem Bandstahl
JPS56144805A (en) * 1980-04-15 1981-11-11 Nippon Kokan Kk <Nkk> Direct rolling apparatus
EP0226446A2 (fr) * 1985-12-12 1987-06-24 Kawasaki Steel Corporation Procédé pour produire des bandes laminées minces à bonne formabilité
EP0306076A1 (fr) * 1987-09-01 1989-03-08 Hoogovens Groep B.V. Fabrication de bandes d'acier formables
WO1989011363A1 (fr) * 1988-05-26 1989-11-30 Mannesmann Ag Procede pour produire en continu du feuillard d'acier ou de la tole d'acier a partir de produits plats fabriques selon le procede de coulee continue en arc
EP0370575A1 (fr) * 1988-11-24 1990-05-30 Hoogovens Groep B.V. Procédé pour la fabrication d'acier déformable

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
SHEET METAL INDUSTRIES. vol. 50, no. 5, May 1973, REDHILL GB pages 297 - 302; OKAMOTO ET AL: 'Manufacture of deep-drawing sheet by warm rolling' see page 297 - page 298; figure 1 *
STAHL UND EISEN. vol. 109, no. 9,10, 16 May 1989, DUSSELDORF DE pages 453 - 462; H.-J. EHRENBERG ET AL: 'Giessen und Giesswalzen dünner Brammen bei der Mannesmannröhren-Werke AG' see pages 453 - 455, 459 - 461; figures 2, 5, 6, 14 -18 *
STEEL TIMES INTERNATIONAL - INCORPORATING IRON &STEEL vol. 14, no. 5, September 1990, REDHILL, SURREY, GB pages 38 - 39; 'Thin end of wedge for minimill in Italy' see the whole document *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU675099B2 (en) * 1993-02-16 1997-01-23 Voest-Alpine Industrieanlagenbau Gmbh Process for the production of a strip, a pre-strip or a slab
US5632177A (en) * 1994-03-01 1997-05-27 Hitachi, Ltd. System and method for manufacturing thin plate by hot working
US5832985A (en) * 1994-10-20 1998-11-10 Mannesmann Aktiengesellschaft Process and device for producing a steel strip with the properties of a cold-rolled product
US6109336A (en) * 1996-06-28 2000-08-29 Hoogovens Staal Bv Method of manufacturing a deep-drawing steel strip or sheet
AU695063B2 (en) * 1996-06-28 1998-08-06 Hoogovens Staal Bv Method and plant for the manufacture of a deep-drawing steel strip or sheet
WO1998000248A1 (fr) * 1996-06-28 1998-01-08 Hoogovens Staal B.V. Procede et installation pour la fabrication d'une bande ou d'une feuille d'acier d'emboutissage profond
GB2322320A (en) * 1997-02-21 1998-08-26 Kvaerner Metals Cont Casting Continuous casting with rolling stages separated by a temperature controlling stage
WO2007010565A1 (fr) * 2005-07-19 2007-01-25 Giovanni Arvedi Processus et installation afferente pour fabriquer des produits allonges en acier sans interruption
US7967056B2 (en) * 2005-07-19 2011-06-28 Giovanni Arvedi Process and related plant for manufacturing steel long products without interruption
US8162032B2 (en) 2005-07-19 2012-04-24 Giovanni Arvedi Process and plant for manufacturing steel plates without interruption
WO2007072516A1 (fr) * 2005-12-22 2007-06-28 Giovanni Arvedi Procede et installation associee pour la production de bandes d'acier avec solution de continuite
CN103111466A (zh) * 2012-12-29 2013-05-22 东北大学 一种双辊连铸薄带异步热轧工艺制备取向硅钢的方法
CN110997169A (zh) * 2017-08-04 2020-04-10 东芝三菱电机产业系统株式会社 无头轧制线的温度控制装置
CN110997169B (zh) * 2017-08-04 2021-07-16 东芝三菱电机产业系统株式会社 无头轧制线的温度控制装置

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