EP0630295A1 - Procede et dispositif visant a reduire la formation de calamine lors du formage a chaud de metal, notamment de l'acier. - Google Patents

Procede et dispositif visant a reduire la formation de calamine lors du formage a chaud de metal, notamment de l'acier.

Info

Publication number
EP0630295A1
EP0630295A1 EP93905334A EP93905334A EP0630295A1 EP 0630295 A1 EP0630295 A1 EP 0630295A1 EP 93905334 A EP93905334 A EP 93905334A EP 93905334 A EP93905334 A EP 93905334A EP 0630295 A1 EP0630295 A1 EP 0630295A1
Authority
EP
European Patent Office
Prior art keywords
inert gas
metal
steel
hot
roll gap
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.)
Granted
Application number
EP93905334A
Other languages
German (de)
English (en)
Other versions
EP0630295B1 (fr
Inventor
Klaus Gruetzmacher
Vladimir Jaeger
Friedrich Raffauf
Klaus Ulrich
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.)
ArcelorMittal Bremen GmbH
Original Assignee
Kloeckner Stahl GmbH
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 Kloeckner Stahl GmbH filed Critical Kloeckner Stahl GmbH
Publication of EP0630295A1 publication Critical patent/EP0630295A1/fr
Application granted granted Critical
Publication of EP0630295B1 publication Critical patent/EP0630295B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B9/00—Measures for carrying out rolling operations under special conditions, e.g. in vacuum or inert atmosphere to prevent oxidation of work; Special measures for removing fumes from rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
    • B21C29/006—Gas treatment of work, e.g. to prevent oxidation or to create surface effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C43/00—Devices for cleaning metal products combined with or specially adapted for use with machines or apparatus provided for in this subclass
    • B21C43/02—Devices for cleaning metal products combined with or specially adapted for use with machines or apparatus provided for in this subclass combined with or specially adapted for use in connection with drawing or winding machines or apparatus
    • B21C43/04—Devices for de-scaling wire or like flexible work
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material

Definitions

  • the invention relates to a method and a device for reducing scale formation during hot forming of metal, in particular steel, in which the heated metal is briefly elastically deformed under high pressure and can then relax.
  • Nitrogen is preferably used as the inert gas, with which the material leaving the roll gap is blown over a certain distance during the hot rolling of steel.
  • the blowing direction of the inert gas is preferably set obliquely against the feed direction of the steel.
  • the inert gas is also blown into the free spaces of the roll gap lying to the side of the rolling stock.
  • a device for carrying out the method according to the invention is that a device for supplying inert gas is connected to a plant for hot forming of metal, which device has a plurality of nozzles directed against the material to be formed and means which prevent the supply of inert gas after the forming the relaxation limit the phase of the application.
  • the device has elements which at least enclose the material to be deformed during the relaxation phase, and on the inside of which the inert gas, which is at a higher than atmospheric pressure, can be supported. It has been shown that a certain inert gas pressure is required in order to bring it sufficiently close and intensively to its surface despite its spontaneous heating when the material to be formed is approached. However, such pressure of the inert gas cannot be built up without at least largely enclosing the material to be formed during the expansion phase.
  • the enclosing elements can be parts on the output side of the roll stand of a roll stand.
  • Figure 3 shows the lower roller table in plan view.
  • Figure 4 is an illustration of the U-shape process in the roll gap.
  • FIG. 5 shows a vertical central section through the rolls and the rolling stock in FIG. 4.
  • These elements include, below the hot strip 7, a roller table consisting of the two parts 8a and 8b with a stripper 9 resting on the work roll 3, and a cooling water distributor 10 below the roll table 8a.
  • the cooling water delivered by these to the work roll 3 is at 11 indicated.
  • a water tank 12 can be seen in FIG. 1, the underside 16 of which is provided with a stripper 13 in the area of the work roll 2.
  • Distributors 14 for the cooling water 15, which is sprayed onto the work roll 2 are arranged in the water box 12.
  • the scraper 13 prevents the cooling water from draining onto the hot strip 7; the cooling water runs off to the side in the region of the cheeks of the stand 1 and is discharged below the roll stand.
  • Hot strip 7 is provided immediately after leaving the roll gap 6 through the space.
  • a pipe 20 running transversely to the rolling direction leads through a hose line 21 to a double pipe transverse distributor 22, which distributes it to a plurality of relatively thin nozzle pipes 23, which have their openings 24 push through the underside 16 of the water tank 12 in a sealed manner and direct an inert gas jet 25 at an angle against the direction of advance of the hot strip 7 against the hot strip 7.
  • Another hose connection 26 leads from the inert gas tube 20 to a transverse distributor 27 arranged in the feed direction of the hot strip behind the water tank 12, which is provided with various nozzle openings 28 distributed over the width of the hot strip 7 and in turn is positioned at an angle to the inert gas jets against the feed direction of the hot strip 7 29 issues. The same applies at an even greater distance from the roll gap 6 for the transverse distributor 30, which is fed from the pipe 20 through a distributor pipe 31.
  • the underside of the hot strip 7 is covered with inert gas.
  • a double tube transverse distributor 42 receives the inert gas via a tube 41 and distributes it to a plurality of nozzle tubes 43 distributed over the width of the roll stand on nozzles 44 which pass through the lower roller table 8a and are inertly inclined against the feed direction of the hot strip 7 ⁇ direct gas jets 45 against it.
  • hoses 46, 47, cross distributors 48, 49 are connected to the pipe 40 and direct inert gas jets 50, 51 (again at an angle to the feed direction) (through the spaced-apart individual elements of the roller table 8b; see FIG. 3) against the Bottom of the hot strip 7.
  • the passage of the hot strip 7 through the work rolls 2, 3 is illustrated schematically in FIG. 4.
  • the warm band 7 comes from the left with the initial thickness s and is plastically deformed in the roll gap 6 to a smaller thickness, which has the size s ⁇ at some distance from the roll gap 6.
  • the scale layer 7a which surrounds the hot strip 7 on all sides before entering the roll gap 6, can be seen in FIG. 4 to the left of the roll gap. This scale layer is torn open and blown off in the course of the wedge-shaped deformation; in Fig. 4 this is indicated greatly enlarged.
  • the zone E of the relaxation phase extends over a certain distance which adjoins the roll gap 6 in the feed direction and which is identified by “E” in FIG. 4 on the top and bottom of the hot strip 7.
  • the hot strip 7 is covered according to the invention with inert gas, preferably nitrogen, so that no new scale can form there on the strip.
  • inert gas preferably nitrogen
  • the inert gas is also blown into the free spaces 52 of the roll gap 6 located next to the hot strip 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)

Abstract

Procédé visant à réduire la formation de calamine lors du formage à chaud de métal, notamment de l'acier. Le métal déformé de manière sensiblement plastique, et brièvement mis sous haute pression, à l'état chauffé, est recouvert d'un gaz inerte, de l'azote par exemple, dans une phase ultérieure de relaxation des contraintes, au cours de laquelle le degré de déformation élastique régresse. Dans un dispositif se prêtant à l'application du procédé, un dispositif destiné à acheminer le gaz inerte est raccordé à l'installation de formage à chaud de métal. Ce dispositif d'amenée du gaz inerte comporte une pluralité de buses orientées vers le matériau formé, ainsi qu'un système qui ne permet l'acheminement du gaz inerte qu'après la phase de formage, c'est-à-dire seulement pendant la phase de relaxation des contraintes. Lors du laminage à chaud de l'acier, des buses de gaz inerte sont par exemple disposées à l'extrémité située côté sortie d'une cage de laminoir, de sorte que le gaz inerte soit injecté obliquement par rapport au sens d'avancement de l'acier dans l'espace entourant le matériau formé, entre les parties situées côté sortie du dernier montant de cage, ainsi que dans les espaces libres situés sur les côtés du matériau formé. Du gaz inerte s'accumule ainsi dans l'espace précité jusqu'à formation d'une pression supérieure à la pression atmosphérique.
EP93905334A 1992-03-14 1993-03-10 Procede et dispositif visant a reduire la formation de calamine lors du formage a chaud de metal, notamment de l'acier Expired - Lifetime EP0630295B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4208208 1992-03-14
DE4208208A DE4208208C2 (de) 1992-03-14 1992-03-14 Verfahren und Vorrichtung zur Verminderung der Zunderbildung beim Warmumformen von Metall, insbesondere von Stahl
PCT/EP1993/000545 WO1993018869A1 (fr) 1992-03-14 1993-03-10 Procede et dispositif visant a reduire la formation de calamine lors du formage a chaud de metal, notamment de l'acier

Publications (2)

Publication Number Publication Date
EP0630295A1 true EP0630295A1 (fr) 1994-12-28
EP0630295B1 EP0630295B1 (fr) 1996-06-05

Family

ID=6454076

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93905334A Expired - Lifetime EP0630295B1 (fr) 1992-03-14 1993-03-10 Procede et dispositif visant a reduire la formation de calamine lors du formage a chaud de metal, notamment de l'acier

Country Status (9)

Country Link
EP (1) EP0630295B1 (fr)
CN (1) CN1078179A (fr)
AU (1) AU3632293A (fr)
DE (2) DE4208208C2 (fr)
ES (1) ES2088276T3 (fr)
PL (1) PL170068B1 (fr)
TW (1) TW227019B (fr)
WO (1) WO1993018869A1 (fr)
ZA (1) ZA931765B (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19936010B4 (de) * 1999-08-04 2009-04-30 Sms Demag Ag Verfahren und Vorrichtung zum Unterdrücken von Zunderbildung insbesondere Sekundärzunder beim Warmwalzen von Brammen
DE19953230C2 (de) * 1999-11-04 2003-08-28 C D Waelzholz Produktionsgmbh Kaltwalzverfahren
US6675622B2 (en) 2001-05-01 2004-01-13 Air Products And Chemicals, Inc. Process and roll stand for cold rolling of a metal strip
ES2467099T3 (es) 2006-08-28 2014-06-11 Air Products And Chemicals, Inc. Aparato y método para controlar el caudal de un líquido criogénico
CN101811149B (zh) * 2010-04-14 2012-05-23 新兴铸管股份有限公司 一种高合金无缝钢管的制造方法
CN102367508A (zh) * 2011-09-16 2012-03-07 山西太钢不锈钢股份有限公司 一种提高热轧钢卷表面质量的方法
CN102728632B (zh) * 2012-05-25 2014-05-28 莱芜钢铁集团有限公司 减少冷轧产品表面的乳化液黑斑的方法
CN105817480B (zh) * 2015-01-07 2018-06-01 宝山钢铁股份有限公司 一种抑制轧辊氧化速率的装置及其使用方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2230897A (en) * 1938-06-23 1941-02-04 Cold Metal Process Co Rolling mill guide
US3613421A (en) * 1969-06-17 1971-10-19 Theodore A Repper Method and apparatus for eliminating iron oxide dust
FR2565511B1 (fr) * 1984-06-07 1988-05-13 Air Liquide Procede et installation de protection d'un metal solide contre l'oxydation pendant une operation de laminage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9318869A1 *

Also Published As

Publication number Publication date
WO1993018869A1 (fr) 1993-09-30
PL170068B1 (en) 1996-10-31
EP0630295B1 (fr) 1996-06-05
ES2088276T3 (es) 1996-08-01
DE59302830D1 (de) 1996-07-11
DE4208208C2 (de) 1994-12-15
TW227019B (fr) 1994-07-21
ZA931765B (en) 1993-09-27
CN1078179A (zh) 1993-11-10
AU3632293A (en) 1993-10-21
DE4208208A1 (de) 1993-09-16

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