EP0795616B1 - Procédé et installation de traitement thermique en continu de bandes métalliques dans des atmosphères de nature différente - Google Patents

Procédé et installation de traitement thermique en continu de bandes métalliques dans des atmosphères de nature différente Download PDF

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Publication number
EP0795616B1
EP0795616B1 EP97400537A EP97400537A EP0795616B1 EP 0795616 B1 EP0795616 B1 EP 0795616B1 EP 97400537 A EP97400537 A EP 97400537A EP 97400537 A EP97400537 A EP 97400537A EP 0795616 B1 EP0795616 B1 EP 0795616B1
Authority
EP
European Patent Office
Prior art keywords
strip
section
sections
optionally
atmosphere
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
EP97400537A
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German (de)
English (en)
French (fr)
Other versions
EP0795616A1 (fr
Inventor
Michel Boyer
Jean-Jacques Nozieres
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.)
Fives Stein SA
Original Assignee
Stein Heurtey SA
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Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9490136&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0795616(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Stein Heurtey SA filed Critical Stein Heurtey SA
Publication of EP0795616A1 publication Critical patent/EP0795616A1/fr
Application granted granted Critical
Publication of EP0795616B1 publication Critical patent/EP0795616B1/fr
Anticipated expiration legal-status Critical
Revoked 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
    • 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 to more particularly the industries strongly sheet metal consumers, where the best way to achieve savings is to reduce the mass, so the thickness sheets, while retaining excellent properties mechanical. The continuous annealing operation responds perfectly to these expectations.
  • the invention relates to the technology of continuous strip processing.
  • Such ovens see for example FR-A-2 282 472 and FR-A-2 375 334) 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 atmosphere protective.
  • the process revolves around one or more annealing strips which consist of several sections equipped to carry out consecutively different phases of the heat treatment cycle, which are in the simplest case: heating, maintenance, cooling.
  • the temperature reached by the product is determined and must be stabilized in order to obtain the metallurgical characteristics required.
  • the operation is easy and commonly performed when the oven operates in steady state; indeed it deals with a product of given dimensions at a constant speed and in correspondence with a heat treatment curve established.
  • Installation efficiency and compliance with curves heat treatment are mainly a function of time of residence of the band circulating through different sections of the oven, or the time taken to reach a temperature at the end of the heating phase or cooling.
  • a gradient of temperature per unit of time (° C / s).
  • 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 allowing to obtain gradients significantly higher than those of the techniques these advantages, in particular of around 100 ° C / s.
  • the invention relates to a method and a device having the characteristics indicated in claims 1 and 3.
  • the strip to be treated runs inside a vertical oven or horizontal operating continuously.
  • This oven is generally composed of heating sections 1, holding 2 and cooling 3. Their number and their arrangement is very diverse; it can coexist between the various cooling sections, holding sections 2, 4 for correct establishment crystallographic transformations.
  • the strip therefore flows through the different sections of the oven, as part of a vertical oven, it is guided by a plurality of fixed rollers 6, 6 ', 6 “, 7, 7 ', 7 “rotated, located at the ends upper and lower volumes or rooms conforming the treatment enclosures.
  • the band stretches in a loop or strands between two top 6 and bottom 7 return rollers. We have between strands of the strip or opposite the outer walls the conventional or induction heating means or cooling devices.
  • Conventional heating means are mainly consisting of heating elements, shaped tubular, inside which we maintain the combustion of liquid or gaseous fuel. These elements called radiant tubes are placed between the strands of the strip and facing the front walls of the oven and heat the strip by radiation. They ensure the most of the energy input and they intervene during the steady state walk of the installation.
  • Combustion fumes can be used to heat a shielded gas recycled through an exchanger, 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 radiant tubes.
  • Each of the speakers is provided with centering devices for the axis of the strip in the axis of the line; they consist of rollers similar 8, 8 'to the guide rollers and are mounted movable inside supports in order to adjust the length developed between two fixed points 6 ', 7' guidance; they can replace the ones if necessary guide rollers and are present in the sections of preheating (0) or heating 1, holding 2, 4 in temperature and cooling 3, 5.
  • the cooling means are produced by shielding gas blowing devices recycled and cooled in exchangers outside the installation. This blowing, of variable speed in depending on the heat exchange needs, takes place in a direction substantially perpendicular to the strip path and across a plurality orifices or slots arranged on the means of blowing.
  • the different rooms are interconnected by connecting tunnels, all possibly maintained under a neutral or reducing protective atmosphere, consisting in particular of a mixture of gases chosen from hydrogen and nitrogen.
  • a neutral or reducing protective atmosphere consisting in particular of a mixture of gases chosen from hydrogen and nitrogen.
  • the path is as follows: The strip enters a first heating enclosure 1 which includes traditional heating sources. This heating enclosure can be preceded by a preheating chamber 0.
  • the band undergoes an elevation of temperature up to the desired temperature to the desired heat treatment, then it goes 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 rapidly decreases, the evolution of transformations crystallographic is stopped.
  • this room is designed similarly to the enclosure of maintenance and it is located between two chambers of cooling.
  • 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 strip scroll.
  • the finished product is rolled up or delivered at the outlet of installation, after possibly having undergone other treatments.
  • the installation implementing this process comprises a plurality of isolation devices 14, especially arranged within the various tunnels of link, upstream and / or downstream, provided between the various heating, holding, cooling, constituting the oven, allowing when these isolation devices 14 are actuated, to separate substantially hermetically contiguous sections and particularly in terms of their respective atmosphere.
  • isolation devices 14 are constituted by at at least one or more sets of two rollers located on either side of the band, or by one or more sets of rollers and shutters.
  • isolation devices 14 vary in the direction of an increase or a decrease around a known value, the composition of mixture constituting the protective atmosphere in a room compared to a contiguous room separated by said isolation device.
  • the process which is the subject of the invention uses as a mixture of protective gas for nitrogen with a percentage of hydrogen or helium.
  • the use of one of these latter gases allows to increase the efficiency of the heating or cooling; we can thus act on the time of stay of the strip through said section of cooling 3 or preheating 0, in view increase the value of the gradient (° C / s) greater than that known in current techniques.
  • a convective cooling section 3 gas recirculated atmosphere is blown onto the strip after cooling, in particular by a gas / water exchanger
  • this section with high hydrogen gas or helium because these gases have characteristics thermo-mechanical (specific heat, viscosity, mass volume, conductivity %) more favorable than nitrogen, which allows either to increase the coefficient exchange, or to decrease the dimensioning of fans, or both.
  • a convective 0 preheating section atmospheric gas recirculated is blown onto the strip after reheating, including a gas / smoke exchanger
  • this section of 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, which allows either to increase the exchange coefficient, or reduce the size of the fans, i.e. of them.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Articles (AREA)
  • Control Of Heat Treatment Processes (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
EP97400537A 1996-03-13 1997-03-11 Procédé et installation de traitement thermique en continu de bandes métalliques dans des atmosphères de nature différente Revoked EP0795616B1 (fr)

Applications Claiming Priority (2)

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

Publications (2)

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

Family

ID=9490136

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97400537A Revoked EP0795616B1 (fr) 1996-03-13 1997-03-11 Procédé et installation de traitement thermique en continu de bandes métalliques dans des atmosphères de nature différente

Country Status (8)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7384489B2 (en) 2002-09-13 2008-06-10 Drever International S.A. Atmosphere control during continuous heat treatment of metal strips

Families Citing this family (20)

* 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
FR2769696B1 (fr) * 1997-10-15 1999-12-31 Stein Heurtey Systeme de securite pour fours a refroidissement rapide de bandes metalliques
WO1999050464A1 (fr) * 1998-03-26 1999-10-07 Kawasaki Steel Corporation Four de traitement thermique en continu, et procede de regulation du gaz atmospherique et procede de refroidissement dans un four de traitement thermique en continu
FR2809418B1 (fr) * 2000-05-25 2003-05-16 Stein Heurtey Procede de mise en securisation d'une enceinte de traitement thermique fonctionnant sous atmosphere controlee
FR2820148B1 (fr) * 2001-01-31 2003-10-31 Stein Heurtey Perfectionnements apportes aux procedes de chauffage de bandes d'acier dans des fours verticaux
FR2844809B1 (fr) * 2002-09-20 2007-06-29 Air Liquide Procede de refroidissement rapide de pieces par transfert convectif et radiatif
WO2006093334A1 (ja) * 2005-03-02 2006-09-08 Japan Metals And Chemicals Co., Ltd. 高蒸気圧金属含有合金の溶解方法
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
US11560606B2 (en) 2016-05-10 2023-01-24 United States Steel Corporation Methods of producing continuously cast hot rolled high strength steel sheet products
JP7186694B2 (ja) 2016-05-10 2022-12-09 ユナイテッド ステイツ スチール コーポレイション 高強度鋼製品及び該製品を製造するためのアニーリング工程
US11993823B2 (en) 2016-05-10 2024-05-28 United States Steel Corporation High strength annealed steel products and annealing processes for making the same
KR20220004213A (ko) 2019-05-07 2022-01-11 유나이테드 스테이츠 스틸 코포레이션 연속 주조 열간 압연 고강도 강판 제품의 제조 방법
WO2021026437A1 (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

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US3950192A (en) * 1974-10-30 1976-04-13 Monsanto Company Continuous carburizing method
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GB2108156B (en) * 1981-09-19 1986-01-15 British Oxygen Co Ltd Heat treatment of metals
DE3809516A1 (de) * 1988-03-22 1989-10-05 Messer Griesheim Gmbh Verfahren zum versorgen einer vertikal- oder horizontalgluehanlage mit schutz- und reaktionsgas
DE3819803C1 (pt) * 1988-06-10 1989-12-14 Ulrich 5810 Witten De Wingens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7384489B2 (en) 2002-09-13 2008-06-10 Drever International S.A. Atmosphere control during continuous heat treatment of metal strips

Also Published As

Publication number Publication date
DE69708482T2 (de) 2002-06-27
US5798007A (en) 1998-08-25
ES2106007T3 (es) 2002-02-16
DE795616T1 (de) 1998-02-19
FR2746112B1 (fr) 1998-06-05
EP0795616A1 (fr) 1997-09-17
FR2746112A1 (fr) 1997-09-19
DE69708482D1 (de) 2002-01-10
ES2106007T1 (es) 1997-11-01
BR9701273A (pt) 1998-11-10
JPH108145A (ja) 1998-01-13
ATE209701T1 (de) 2001-12-15

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