EP0531755B1 - Procédé pour la fabrication à chaud de large bande - Google Patents

Procédé pour la fabrication à chaud de large bande Download PDF

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Publication number
EP0531755B1
EP0531755B1 EP92114047A EP92114047A EP0531755B1 EP 0531755 B1 EP0531755 B1 EP 0531755B1 EP 92114047 A EP92114047 A EP 92114047A EP 92114047 A EP92114047 A EP 92114047A EP 0531755 B1 EP0531755 B1 EP 0531755B1
Authority
EP
European Patent Office
Prior art keywords
stand
train
wide strip
strip
temperature
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.)
Revoked
Application number
EP92114047A
Other languages
German (de)
English (en)
Other versions
EP0531755A1 (fr
Inventor
Wolfgang Prof. Dr. Rohde
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 Schloemann Siemag AG
Schloemann Siemag 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
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Application filed by SMS Schloemann Siemag AG, Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG
Publication of EP0531755A1 publication Critical patent/EP0531755A1/fr
Application granted granted Critical
Publication of EP0531755B1 publication Critical patent/EP0531755B1/fr
Anticipated expiration legal-status Critical
Revoked 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
    • B21B45/004—Heating the product
    • 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
    • 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
    • B21B45/04—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 de-scaling, e.g. by brushing
    • B21B45/08—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 de-scaling, e.g. by brushing hydraulically

Definitions

  • the invention relates to a method for producing hot wide strip in a rolling mill consisting of a single or multi-stand roughing mill and a multi-stand finishing mill, which are preceded by a high pressure descaling and a cropping shear.
  • a method according to the preamble of claim 1 is known from EP-A-320846.
  • Conventional-type hot strip mills consist of a roughing train and a finishing train.
  • the roughing mill the roughing slab of 200 to 300 mm thickness is rolled out in several passes to an intermediate thickness of 25 to 60 mm.
  • the roughing mill generally consists of several rolling stands. At least one reversing scaffold is required.
  • the belt After the last stitch in the roughing train, the belt is led over the roller table to the finishing train. It goes through the cropping shear and high pressure descaling.
  • the temperature is approximately the same over the entire length of the ribbon.
  • the rolling temperature in the first stand drops steadily due to the radiation and convection to the environment.
  • coil weights For example, of 20 kg / mm coil width, the temperature drop at the end of the strip is already approx. 150 ° C.
  • the process is disadvantageous in several ways. Due to the increased forming speeds and the still existing temperature drop in the front stands, there is a noticeable increase in the rolling forces and the rolling moments over the strip length. The resulting changes in the mill stretch and in the bending of the roller sets have to be eliminated by complex control and regulation mechanisms. The amount of heat to be dissipated in the cooling section increases steadily with increasing speed. Depending on the speed, additional cooling zones must be activated, which means that irregularities in the reel temperature reached are unavoidable. Ultimately, uniform cooling of the strip over the length of the strip at the same cooling speeds becomes impossible.
  • the object of the present invention is to change a method for the production of hot wide strip by suitable measures so that the rolling speed from the beginning of the strip to the end of the strip can be kept constant without changing the rolling temperatures in the individual stands.
  • a roller hearth furnace 5 is arranged between the last stand of the roughing mill 1 and the cropping shear 4, which adjusts the temperature of the belt 7 coming from the roughing mill 1 to a uniform value over the entire belt length and keeps it constant.
  • the belt 7 leaves the roller hearth furnace 5 at this temperature at a speed which corresponds to the tapping speed in the first stand of the finishing train 2.
  • the speed of the finishing train 2 is not changed according to the invention. Since the throughput time for the distance from the end of the roller hearth furnace 5 to the roll gap of the first stand at the same speed is the same for all late arriving parts of the strip 7, the roll temperature in the first stand and in all other roll stands remains constant. Ultimately, by choosing this constant rolling speed for the entire strip length, depending on the furnace temperature and strip thickness, any desired final rolling temperature can be set.
  • Skidmarks are cold spots in the support strip at regular intervals due to the contact of the pre-slab with the water-cooled support rails in the slab furnace.
  • the skid marks are largely eliminated as they pass through the heated roller hearth furnace 5, so that there is a significant reduction in the known disturbances in the rolling force and thus in the thickness of the strip to be rolled.
  • Another advantage is the reduction in the drive power required for finishing train 2, since the power required for acceleration is eliminated.
  • the construction of the cooling section 8 is considerably simplified. The cooling at constant speed enables the driving of predetermined temperature curves to achieve certain technological properties, which can be maintained for each strip point over the entire strip length. This opens up new possibilities for optimizing thermomechanical effects.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Glass Compositions (AREA)
  • Preparation Of Fruits And Vegetables (AREA)
  • Noodles (AREA)

Claims (3)

  1. Procédé pour la fabrication d'une large bande laminée à chaud dans un train de laminage, constitué par un train ébaucheur (1) à une ou plusieurs cages et par un train finisseur (2) à plusieurs cages, où sont disposés en amont un décalaminage à haute pression (3) et une cisaille à ébouter (4), et où un four à rouleaux (5) est agencé entre le train ébaucheur et la cisaille à ébouter,
    caractérisé en ce que
    la large bande laminée à chaud provenant de la dernière cage du train ébaucheur (1) est réglée dans le four à rouleaux (5) à une température constante sur toute la longueur de bande, et est maintenue à cette température réglée,
    en ce que la large bande laminée à chaud quitte avec cette température uniforme et constante le four à rouleaux (5) avec une vitesse qui correspond à la vitesse de la passe initiale dans la première cage du train finisseur (2), et
    en ce que pour le maintien d'une température constante pour le laminage final de la large bande laminée à chaud, le train finisseur (2) est entrâiné avec une vitesse de laminage constante, et
    en ce que la large bande laminée à chaud provenant de la dernière cage du train finisseur (2) est refroidie à une température de bobinage constante dans un train de refroidissement (8) agencé en aval, avec des vitesses de refroidissement égales à l'intérieur du train de refroidissement.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    le four à rouleaux (5) est chauffé avec du gaz ou avec du gazole.
  3. Procédé selon l'une ou l'autre des revendications 1 et 2,
    caractérisé en ce que
    la large bande laminée à chaud provenant de la dernière cage (1) du train ébaucheur est chauffée dans un train de réchauffement inductif (6), avant qu'elle soit introduite dans le four à rouleaux (5).
EP92114047A 1991-09-09 1992-08-18 Procédé pour la fabrication à chaud de large bande Revoked EP0531755B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4129749A DE4129749A1 (de) 1991-09-09 1991-09-09 Walzstrasse zur erzeugung von warmbreitband
DE4129749 1991-09-09

Publications (2)

Publication Number Publication Date
EP0531755A1 EP0531755A1 (fr) 1993-03-17
EP0531755B1 true EP0531755B1 (fr) 1995-12-13

Family

ID=6440073

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92114047A Revoked EP0531755B1 (fr) 1991-09-09 1992-08-18 Procédé pour la fabrication à chaud de large bande

Country Status (5)

Country Link
EP (1) EP0531755B1 (fr)
JP (1) JP3262379B2 (fr)
AT (1) ATE131422T1 (fr)
DE (2) DE4129749A1 (fr)
ES (1) ES2081004T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5927118A (en) * 1996-05-28 1999-07-27 Nkk Corporation Method for making hot-rolled steel sheet and apparatus therefor
DE59709709D1 (de) * 1997-11-21 2003-05-08 Sms Demag Ag Nachrüstung von Warmwalzstrassen zum Walzen von dünnen Bändern

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2559222A1 (de) * 1975-12-30 1977-07-14 Nippon Steel Corp Verfahren zum warmwalzen von band und warmbandwalzwerk
US4444038A (en) * 1981-09-29 1984-04-24 Tippins Machinery Company, Inc. Method of modernizing a hot strip mill
AU2669088A (en) * 1987-12-18 1989-06-22 Hitachi Limited Apparatus and method for hot-rolling slab into sheets

Also Published As

Publication number Publication date
EP0531755A1 (fr) 1993-03-17
DE59204667D1 (de) 1996-01-25
ES2081004T3 (es) 1996-02-16
JPH06315710A (ja) 1994-11-15
DE4129749A1 (de) 1993-03-11
JP3262379B2 (ja) 2002-03-04
ATE131422T1 (de) 1995-12-15

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