EP0795616A1 - Durchlaufglühverfahren von Metallband in verschiedenen Schutzgasen - Google Patents

Durchlaufglühverfahren von Metallband in verschiedenen Schutzgasen Download PDF

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Publication number
EP0795616A1
EP0795616A1 EP97400537A EP97400537A EP0795616A1 EP 0795616 A1 EP0795616 A1 EP 0795616A1 EP 97400537 A EP97400537 A EP 97400537A EP 97400537 A EP97400537 A EP 97400537A EP 0795616 A1 EP0795616 A1 EP 0795616A1
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EP
European Patent Office
Prior art keywords
section
strip
cooling
sections
heating
Prior art date
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Granted
Application number
EP97400537A
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English (en)
French (fr)
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EP0795616B1 (de
Inventor
Michel Boyer
Jean-Jacques Nozieres
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Fives Stein SA
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Stein Heurtey SA
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    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
    • 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
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/613—Gases; Liquefied or solidified normally gaseous material
    • 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
    • C21D1/76—Adjusting the composition of the atmosphere
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling

Definitions

  • the present invention relates to a method of heat treatment of metal strips. It relates more particularly to industries which consume a lot of sheets, where the best way to make savings is to reduce the mass and therefore the thickness of the sheets, while retaining excellent mechanical properties.
  • the continuous annealing operation perfectly meets these expectations.
  • the invention relates to the technology of continuous strip processing ovens. Such ovens are used in continuous annealing lines or continuous galvanizing lines, however the invention can be applied to other types of installations where the strips are treated continuously, under a protective atmosphere.
  • the process revolves around one or more strip annealing ovens which consist of several sections equipped to consecutively carry out the different phases of the heat treatment cycle, which are in the simplest case: heating, holding, cooling.
  • the temperature reached by the product is determined and must be stabilized in order to obtain the required metallurgical characteristics.
  • the operation is easy and commonly performed when the oven is operating in steady state; in fact, it processes a product of given dimensions at a constant speed and in correspondence with an established heat treatment curve.
  • the present invention aims to overcome these drawbacks by proposing a process which does not oxidize the sheets in circulation, and which guarantees a good flatness, a perfect surface condition, while making it possible to obtain gradients clearly greater than those of the prior techniques. having these advantages, in particular of the order of 100 ° C./s.
  • the process of heat treatment of metallic strip continuously passing through an oven, thermally insulated and in a protective atmosphere; said oven consisting of at least one heating, holding, cooling section; said strip being guided by a plurality of rollers arranged in particular in the lower part and in the upper part of said sections, in order to conform a plurality of strands, is characterized in that the strip passes through at least one partial or total isolation device positioned within at least one section or between two sections, allowing partial or total differentiation of the atmosphere present within said section, in order to ensure, by the composition of the atmosphere, different heat transfer properties on the strip relative to at least one other adjoining section, with a different atmosphere.
  • the strip to be treated travels inside a vertical or horizontal oven operating continuously.
  • This oven is generally composed of heating 1, holding 2 and cooling 3 sections. Their number and arrangement are very diverse; it can coexist between the various cooling sections, holding sections 2, 4 for the correct establishment of the crystallographic transformations.
  • the strip therefore circulates through the different sections of the oven, in the context of a vertical oven, it is guided by a plurality of fixed rollers 6, 6 ', 6 ", 7, 7', 7" driven in rotation, located at the upper and lower ends of the volumes or chambers conforming the treatment enclosures.
  • the strip stretches in a loop or in strands between two top 6 and bottom 7 return rollers. Between the strands of the strip or opposite the external walls, there are conventional or induction heating means or else cooling members.
  • Conventional heating means mainly consist of heating elements, of tubular shape, inside which the combustion of a liquid or gaseous fuel is maintained. These elements called radiant tubes are placed between the strands of the strip and facing the front walls of the furnace and heat the strip by radiation. They provide most of the energy input and they intervene during the steady state operation of the installation.
  • the combustion fumes can be used to heat a recycled protective gas through an exchanger, this gas is blown in a direction substantially perpendicular to the path of the strip through a plurality of orifices or slots arranged on the means blowing.
  • the strip is thus preheated before heating by the radiant tubes.
  • each of the enclosures is provided with members for centering the axis of the strip in the axis of the line; they are constituted by rollers similar 8, 8 'to the guide rollers and are mounted movable inside supports in order to adjust the length developed between two fixed guide points 6 ', 7'; they can replace the guide rollers if necessary and are present in the preheating (0) or heating 1, holding 2, 4 temperature and cooling 3, 5 sections.
  • the cooling means are generally produced by devices for blowing recycled and cooled protective gas in exchangers outside the installation. This blowing, of variable speed as a function of the heat exchange needs, takes place in a direction substantially perpendicular to the path of the strip and through a plurality of orifices or slots arranged on the blowing means.
  • the various chambers are linked together by connecting tunnels, the whole possibly being maintained under a neutral or reducing protective atmosphere, constituted in particular by a mixture of gases chosen from hydrogen and nitrogen.
  • a mixture of gases based on hydrogen or helium is used, the composition of which exceeds the values commonly used (of the order of 5% for 95% nitrogen).
  • the process according to the invention uses an atmosphere of hydrogen or helium, the content of which can exceed 5% and more particularly 15% to reach, for example, 50% of hydrogen or helium.
  • the heating and / or cooling chambers are used in an atmosphere, the characteristics of the hydrogen or helium contents of which are greater than the explosive limit values of these gases.
  • the description also applies to helium instead of or in addition to hydrogen.
  • the path is as follows:
  • the strip enters a first heating enclosure 1 which comprises traditional heating sources.
  • This heating chamber can be preceded by a preheating chamber 0.
  • the strip undergoes a rise in temperature to the desired temperature corresponding to the desired heat treatment, then it passes into a holding chamber 2 in which the energy supply is kept constant for the establishment of crystallographic transformations. Its temperature is lowered by the means explained above in a so-called cooling enclosure 3, the temperature decreases rapidly, the evolution of crystallographic transformations is stopped.
  • this chamber is designed in a similar manner to the holding enclosure and it is located between two cooling chambers.
  • the last cooling 5 is generally carried out, either like the previous one by a gas-solid exchange, or by a much more efficient liquid-solid exchange; we proceed by spraying liquid on the moving strip.
  • the finished product is rolled up or delivered at the outlet of the installation, after possibly undergoing other treatments.
  • the installation implementing this method comprises a plurality of isolation devices 14, in particular arranged within the various connecting tunnels, upstream and / or downstream, provided between the various sections of heating, holding, cooling, constituting the oven, allowing when these isolation devices 14 are actuated, to substantially hermetically separate adjoining sections and particularly at their respective atmosphere.
  • isolation devices 14 are constituted by at least one or more sets of two rollers located on either side of the strip, or by one or more sets of rollers and flaps.
  • isolation devices 14 it is thus possible, by virtue of these isolation devices 14, to vary in the direction of an increase or a decrease around a known value, the composition of the mixture constituting the protective atmosphere in a chamber with respect to a Adjoining room separated by said isolation device.
  • the process which is the subject of the invention uses as a protective gas mixture nitrogen with a percentage of hydrogen or helium.
  • nitrogen with a percentage of hydrogen or helium.
  • the use of one of these latter gases makes it possible to increase the efficiency of the heating or cooling members; it is thus possible to act on the residence time of the strip through said cooling 3 or preheating 0 section, with a view to increasing the value of the gradient (° C / s) greater than that known in current techniques.
  • a convective cooling section 3 the recirculated atmosphere gas is blown onto the strip after cooling, in particular by a gas / water exchanger
  • this section with gas with a high level of hydrogen or helium, because these gases have thermo-mechanical characteristics (specific heat, viscosity, density, conductivity ...) more favorable than nitrogen, this which allows either to increase the coefficient either reduce the size of the fans, or both.
  • a temperature gradient is thus reached up to values of 75 ° C / s to 150 ° C / s and preferably close to 100 ° C / s instead of 70 ° C / s with current techniques.
EP97400537A 1996-03-13 1997-03-11 Durchlaufglühverfahren von Metallband in verschiedenen Schutzgasen und Vorrichtung Revoked EP0795616B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9603140A FR2746112B1 (fr) 1996-03-13 1996-03-13 Procede de traitement thermique en continu de bandes metalliques dans des atmospheres de nature differente
FR9603140 1996-03-13

Publications (2)

Publication Number Publication Date
EP0795616A1 true EP0795616A1 (de) 1997-09-17
EP0795616B1 EP0795616B1 (de) 2001-11-28

Family

ID=9490136

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97400537A Revoked EP0795616B1 (de) 1996-03-13 1997-03-11 Durchlaufglühverfahren von Metallband in verschiedenen Schutzgasen und Vorrichtung

Country Status (8)

Country Link
US (1) US5798007A (de)
EP (1) EP0795616B1 (de)
JP (1) JPH108145A (de)
AT (1) ATE209701T1 (de)
BR (1) BR9701273A (de)
DE (2) DE795616T1 (de)
ES (1) ES2106007T3 (de)
FR (1) FR2746112B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6126891A (en) * 1997-10-15 2000-10-03 Stein Heurtey System for high rate cooling furnace for metal strips
EP1069193A1 (de) * 1998-03-26 2001-01-17 Kawasaki Steel Corporation Ofen zur kontinuierlichen wärmebehandlung und verfahren zur überwachung der atmosphäre und der kühlung in diesem ofen
FR2809418A1 (fr) * 2000-05-25 2001-11-30 Stein Heurtey Procede de mise en securisation d'une enceinte de traitement thermique fonctionnant sous atmosphere controlee

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07118269B2 (ja) * 1985-09-20 1995-12-18 株式会社日立製作所 カラ−ブラウン管のカレツトレス封止方法
JPH0795427B2 (ja) * 1986-12-08 1995-10-11 ソニー株式会社 陰極線管の製造装置
FR2820148B1 (fr) * 2001-01-31 2003-10-31 Stein Heurtey Perfectionnements apportes aux procedes de chauffage de bandes d'acier dans des fours verticaux
BE1015109A3 (fr) * 2002-09-13 2004-10-05 Drever Internat S A Procede de traitemant thermique de bande metallique.
FR2844809B1 (fr) * 2002-09-20 2007-06-29 Air Liquide Procede de refroidissement rapide de pieces par transfert convectif et radiatif
KR20070107757A (ko) * 2005-03-02 2007-11-07 니혼쥬카가쿠고교가부시키가이샤 고증기압 금속 함유 합금의 용해방법
FR2900661B1 (fr) * 2006-05-02 2008-09-26 Stein Heurtey Perfectionnement apporte aux sections de chauffage rapide des lignes de traitement thermique en continu.
CN100465302C (zh) * 2006-08-17 2009-03-04 武汉钢铁(集团)公司 三段式可控气氛热处理炉
DE102012110010B4 (de) * 2012-10-19 2016-09-01 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh Vorrichtung und Verfahren zur kontinuierlichen Behandlung eines Metallbandes
JP5884748B2 (ja) 2013-02-25 2016-03-15 Ｊｆｅスチール株式会社 鋼帯の連続焼鈍装置および連続溶融亜鉛めっき装置
WO2016001701A1 (en) * 2014-07-03 2016-01-07 Arcelormittal Polyvalent processing line for heat treating and hot dip coating a steel strip
KR101717961B1 (ko) 2016-03-08 2017-03-20 (주)나우이엔씨 강판의 연속 열처리로용 급속 냉각 시스템 및 이의 압력 제어 방법
US10385419B2 (en) 2016-05-10 2019-08-20 United States Steel Corporation High strength steel products and annealing processes for making the same
US11560606B2 (en) 2016-05-10 2023-01-24 United States Steel Corporation Methods of producing continuously cast hot rolled high strength steel sheet products
JP2022531669A (ja) 2019-05-07 2022-07-08 ユナイテッド ステイツ スチール コーポレイション 連続鋳造された熱間圧延高強度鋼板製品を製造する方法
CA3149331A1 (en) 2019-08-07 2021-02-11 United States Steel Corporation High ductility zinc-coated steel sheet products
AU2020335005A1 (en) 2019-08-19 2022-03-03 United States Steel Corporation High strength steel products and annealing processes for making the same

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2282472A1 (fr) * 1974-08-20 1976-03-19 Nippon Steel Corp Installation pour le traitement de recuit d'une bande d'acier dans une ligne de traitement continue
US3950192A (en) * 1974-10-30 1976-04-13 Monsanto Company Continuous carburizing method
FR2375334A1 (fr) * 1976-12-23 1978-07-21 Armco Steel Corp Procede de revetement metallique par immersion a chaud d'une bande ou tole d'acier
EP0075438A1 (de) * 1981-09-19 1983-03-30 BOC Limited Wärmebehandlung von Metallen
DE3809516A1 (de) * 1988-03-22 1989-10-05 Messer Griesheim Gmbh Verfahren zum versorgen einer vertikal- oder horizontalgluehanlage mit schutz- und reaktionsgas
WO1989012111A1 (en) * 1988-06-10 1989-12-14 Ulrich Wingens Heat-treatment process for metallic workpieces

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2282472A1 (fr) * 1974-08-20 1976-03-19 Nippon Steel Corp Installation pour le traitement de recuit d'une bande d'acier dans une ligne de traitement continue
US3950192A (en) * 1974-10-30 1976-04-13 Monsanto Company Continuous carburizing method
FR2375334A1 (fr) * 1976-12-23 1978-07-21 Armco Steel Corp Procede de revetement metallique par immersion a chaud d'une bande ou tole d'acier
EP0075438A1 (de) * 1981-09-19 1983-03-30 BOC Limited Wärmebehandlung von Metallen
DE3809516A1 (de) * 1988-03-22 1989-10-05 Messer Griesheim Gmbh Verfahren zum versorgen einer vertikal- oder horizontalgluehanlage mit schutz- und reaktionsgas
WO1989012111A1 (en) * 1988-06-10 1989-12-14 Ulrich Wingens Heat-treatment process for metallic workpieces

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ALTENA H: "HOCHDRUCK-WASSERSTOFFABSCHRECKUNG PRAKTISCHE ERFAHRUNGEN, EINSATSMOGLICHKEITEN UND GRENZEN DES VERFAHRENS", HAERTEREI TECHNISCHE MITTEILUNGEN, vol. 50, no. 1, 1 January 1995 (1995-01-01), pages 27 - 30, XP000492418 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6126891A (en) * 1997-10-15 2000-10-03 Stein Heurtey System for high rate cooling furnace for metal strips
EP0913658B1 (de) * 1997-10-15 2002-03-13 Stein Heurtey Sicherheitssystem für einen Ofen mit Gaskühlung für Metallband
EP1069193A1 (de) * 1998-03-26 2001-01-17 Kawasaki Steel Corporation Ofen zur kontinuierlichen wärmebehandlung und verfahren zur überwachung der atmosphäre und der kühlung in diesem ofen
EP1069193A4 (de) * 1998-03-26 2003-01-02 Kawasaki Steel Co Ofen zur kontinuierlichen wärmebehandlung und verfahren zur überwachung der atmosphäre und der kühlung in diesem ofen
FR2809418A1 (fr) * 2000-05-25 2001-11-30 Stein Heurtey Procede de mise en securisation d'une enceinte de traitement thermique fonctionnant sous atmosphere controlee
EP1160342A1 (de) * 2000-05-25 2001-12-05 Stein Heurtey Verfahren zum Sichern eines Gefässes für die thermische Behandlung in Schutzatmosphäre

Also Published As

Publication number Publication date
ATE209701T1 (de) 2001-12-15
DE69708482T2 (de) 2002-06-27
US5798007A (en) 1998-08-25
BR9701273A (pt) 1998-11-10
ES2106007T1 (es) 1997-11-01
JPH108145A (ja) 1998-01-13
FR2746112A1 (fr) 1997-09-19
DE795616T1 (de) 1998-02-19
ES2106007T3 (es) 2002-02-16
DE69708482D1 (de) 2002-01-10
EP0795616B1 (de) 2001-11-28
FR2746112B1 (fr) 1998-06-05

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