EP0630295B1 - 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 Download PDF

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Publication number
EP0630295B1
EP0630295B1 EP93905334A EP93905334A EP0630295B1 EP 0630295 B1 EP0630295 B1 EP 0630295B1 EP 93905334 A EP93905334 A EP 93905334A EP 93905334 A EP93905334 A EP 93905334A EP 0630295 B1 EP0630295 B1 EP 0630295B1
Authority
EP
European Patent Office
Prior art keywords
inert gas
metal
roll
steel
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.)
Expired - Lifetime
Application number
EP93905334A
Other languages
German (de)
English (en)
Other versions
EP0630295A1 (fr
Inventor
Klaus GRÜTZMACHER
Vladimir JÄGER
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
Stahlwerke Bremen 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, Stahlwerke Bremen 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

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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, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/009—Gas treatment of work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS 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 an apparatus for reducing scale formation during hot rolling of metal, in particular steel, in which the heated metal is plastically deformed for a short time under high pressure with an elastic component and can then relax, the rolling stock on the outlet side using several against the Rolled nozzles, which are taken up by a device for supplying inert gas, are covered with inert gas.
  • a method and device is known from JP-A-61-123403. It is also known from US-A-3,613,421 that blowing metal from a hot rolling mill is blown with inert gas in order to prevent the formation of oxide dust.
  • the inert gas coverage of the leaking metal is practically limited to the nip itself or a short path thickness immediately following it.
  • 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.
  • this distance corresponds to the 'relaxation phase' of the steel strip after its plastic deformation in the nip; in any case, it has been shown that naturally a (normally thin) scale build-up occurs after this certain distance, but no more of the suspended matter is emitted.
  • 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 characterized according to the invention by the features according to claim 3. It is preferably provided that the device has elements which at least enclose the material to be formed 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 the surface of the material to be formed, despite its spontaneous heating when it approaches the material to be formed. 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 of the roll stand of a roll stand on the exit side.
  • FIG. 1 Only sections of the work rolls 2, 3 and support rolls 4, 5 held in the stand 1 of a roll stand are shown in FIG. 1 shown in a schematic side view.
  • the heated rolling stock passes through the roll gap 6 from left to right in FIG. 1; the elements belonging to the rolling stand shown in FIG. 1 are therefore on the output side of the rolling stock.
  • These elements include, below the hot strip 7, a roller table consisting of the two parts 8a and 8b with a scraper 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 indicated at 11.
  • a water tank 12 can be seen in FIG. 1, the underside 16 of which is provided with a scraper 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 area of the cheeks of the stand 1 and is discharged below the roll stand.
  • Both in the area of the roller table 8 and the top-side water box 12 are devices for blowing nitrogen into the largely enclosed by the table and the water box with their wipers 9, 13 and the side components of the stand 1, by the hot strip 7 immediately after leaving the roll gap 6 through room provided.
  • 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 feed direction of the hot strip 7 against the hot strip 7.
  • Another hose connection 26 leads from the tube 20 inert gas 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 emits inert gas jets 29 at an angle to the feed direction of the hot strip 7 .
  • 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 emits inert gas jets 29 at an angle to the feed direction of the hot strip 7 .
  • a double pipe cross distributor 42 receives the inert gas from a pipe 40 via a hose 41 and distributes it to a plurality of nozzle pipes 43 distributed over the width of the roll stand on nozzles 44 which pass through the lower roller table 8a and inert gas jets which are inclined against the feed direction of the hot strip 7 45 against this.
  • hoses 46, 47, cross distributors 48, 49 are connected to the pipe 40 and direct inert gas jets 50, 51 (through the spaced-apart individual elements of the roller table 8b; cf. Hot strip 7.
  • the passage of the hot strip 7 through the work rolls 2, 3 is illustrated schematically in FIG. 4.
  • the hot strip 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 1 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; this is indicated in a greatly enlarged manner in FIG. 4.
  • 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.
  • inert gas preferably nitrogen - so that no new scale can form on the strip there.
  • the metal surface reacts with the oxygen in the ambient air and forms a (new) scale layer 7b of comparatively small thickness.
  • the inert gas is also blown into the free spaces 52 of the roll gap 6 located next to the hot strip 7.

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  • 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.

Claims (4)

  1. Procédé pour réduire la formation de calamine lors du laminage à chaud du métal, en particulier de l'acier, selon lequel le métal réchauffé subit une brève déformation plastique sous haute pression avec une partie élastique et peut ensuite se détendre, la matière à laminer étant recouverte côté sortie de gaz inerte, caractérisé en ce que la matière à laminer quittant la fente de laminage (6) ne reçoit du gaz inerte que sur le tronçon (E) dans les limites duquel intervient la détente de la partie de déformation élastique.
  2. Procédé selon la revendication 1, caractérisé en ce que le gaz inerte est insufflé également dans les espaces libres, situés à côte de la matière à laminer, de la fente de laminage (6).
  3. Dispositif pour l'application du procédé selon la revendication 1 ou 2 sur une cage dc laminoir pour le laminage à chaud du métal, avec lequel un appareil pour l'arrivée du gaz inerte, qui présente une pluralité de buses dirigées vers la matière à déformer, est raccordé à la cage de laminoir, caractérisé on ce qu'on prévoit des moyens (23, 28, 48, 49) avec lesquels l'arrivée du gaz inerte après laminage à chaud peut, après la fente de laminage (6), être étendue et limitée au tronçon (E) correspondant à la phase de détente élastique de la matière à laminer spécifique.
  4. Dispositif selon la revendication 3, caractérisé en ce que les moyens contiennent des éléments de boîtier dans lesquels le gaz inerte peut s'amasser à 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 EP0630295A1 (fr) 1994-12-28
EP0630295B1 true EP0630295B1 (fr) 1996-06-05

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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)

Cited By (1)

* 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

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
MY154319A (en) 2006-08-28 2015-05-29 Air Prod & Chem Spraying apparatus for spraying cryogenic liquids and spraying method related to this apparatus
CN100571925C (zh) * 2006-12-29 2009-12-23 黄文结 一种在金属坯料热温锻造加工时减少温热锻造氧化皮膜生成的方法
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

Cited By (1)

* 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

Also Published As

Publication number Publication date
PL170068B1 (en) 1996-10-31
AU3632293A (en) 1993-10-21
ES2088276T3 (es) 1996-08-01
DE4208208C2 (de) 1994-12-15
DE4208208A1 (de) 1993-09-16
ZA931765B (en) 1993-09-27
EP0630295A1 (fr) 1994-12-28
DE59302830D1 (de) 1996-07-11
TW227019B (fr) 1994-07-21
CN1078179A (zh) 1993-11-10
WO1993018869A1 (fr) 1993-09-30

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