EP1229138A1 - Perfectionnements apportés aux procédés de chauffage de bandes d'acier dans des fours verticaux - Google Patents

Perfectionnements apportés aux procédés de chauffage de bandes d'acier dans des fours verticaux Download PDF

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Publication number
EP1229138A1
EP1229138A1 EP02290100A EP02290100A EP1229138A1 EP 1229138 A1 EP1229138 A1 EP 1229138A1 EP 02290100 A EP02290100 A EP 02290100A EP 02290100 A EP02290100 A EP 02290100A EP 1229138 A1 EP1229138 A1 EP 1229138A1
Authority
EP
European Patent Office
Prior art keywords
rollers
radiant tubes
radiant
heating
oven
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.)
Withdrawn
Application number
EP02290100A
Other languages
German (de)
English (en)
French (fr)
Inventor
François Mignard
Patrick Dubois
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
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 Stein Heurtey SA filed Critical Stein Heurtey SA
Publication of EP1229138A1 publication Critical patent/EP1229138A1/fr
Withdrawn legal-status Critical Current

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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
    • C21D9/567—Continuous furnaces for strip or wire with heating in fluidised beds
    • 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
    • C21D9/562—Details
    • C21D9/563—Rolls; Drums; Roll arrangements
    • 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
    • C21D9/562—Details

Definitions

  • the present invention relates to improvements made to methods of heating steel strips in vertical ovens and it relates more particularly to vertical heat treatment lines in continuous steel strips, such as annealing or galvanizing lines.
  • the technical problem which the present invention proposes to solve is that of limiting the formation of folds in the heating sections of these vertical treatment lines using radiant tubes.
  • the reference 1 designates the oven according to the technique known in the art. through which the metal strip 3 to be treated moves continuously, this belt passing over designated successive transport or return rollers by reference 2.
  • the strip is heated by radiation using tubes radiant heaters such as 4 which are supplied with combustion air and fuel (generally gas) in generally vertical zones 5.
  • Each zone such as 5 corresponds to a thermal cutting of the oven, which generally does not physically correspond to a specific room of the oven.
  • a zone groups together an inseparable set of radiant tubes 4, equipped with burners having a common fuel and air supply combustion. The heat demand of the oven therefore results in a set point fuel and combustion air flow rate per zone, each zone with its own regulation system. In this operating mode, all burners in the same zone operate identically, being given that they are all powered by the same flow of fuel and air from combustion.
  • the strip 3 is heated on both sides by the radiant tubes located on either side of the pass line, and it changes lines when it passes over each of the deflection rollers or transport such as 2.
  • the heating curve of the strip in the oven is therefore controlled by the indexation of the different zones, for example six indexations when the oven has six zones such as 5.
  • the latter tends to take the form of a "diabolo", which must be avoided at all costs because the tape is then more guided in the center of the roller and is then in an unstable position; he will then difficult to refocus it in the treatment line, even using guide rollers.
  • the rollers are given a domed initial, which is sufficient to maintain a very slight domed after the thermal contraction due to contact of the roller with the strip.
  • the profile of the roller is optimized for a given strip width, especially the flat length of the table. Wider bands will see a large curvature, which is favorable for guidance but unfavorable in terms risk of wrinkles.
  • the present invention has set itself the objective of providing an economical solution and effective at this problem of the formation of folds in the vertical ovens of treatment of steel strips.
  • the invention is not intended to correct the thermal effects of the oven on the transport or return rollers by superimposing actuators but it acts at the source by directly controlling the flow heat emitted by the heating system while retaining the process initial.
  • the invention relates to a method for reducing the folds formed. in heating zones, by radiant tubes, of treatment lines continuous thermal of metal strips, such as annealing lines or of galvanizing, said strips, in said ovens passing on rollers transport and / or return, said process which consists in modifying the state thermal rollers being characterized in that said modification is performed directly by modulating the heating of said radiant tubes located in the vicinity of the rollers, directly controlling the heat flux emitted by the radiant tubes to the rollers.
  • the power is supplied separately and independently in combustion air and fuel each tube radiant and the fuel flow for each radiant tube is continuously adjusted.
  • the method which is the subject of the invention, it is modulates the heating of the radiant tubes so as to reduce or even remove the thermal gradient in the oven, between the lower rollers and the upper rollers of the latter.
  • each radiant tube is provided with a independent fuel and combustion air supply, so to be able to directly control the heat flow emitted by the radiant tubes 4 towards the rollers such as 2.
  • the parts of the oven are maintained located downstream, the highest possible temperature of radiant tubes (greater expansion of the roller on its edges). We will therefore seek to low production, faster temperature rise of the belt (see figure 5).

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)
  • Coating With Molten Metal (AREA)
  • Gas Burners (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Furnace Details (AREA)
EP02290100A 2001-01-31 2002-01-15 Perfectionnements apportés aux procédés de chauffage de bandes d'acier dans des fours verticaux Withdrawn EP1229138A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0101331 2001-01-31
FR0101331A FR2820148B1 (fr) 2001-01-31 2001-01-31 Perfectionnements apportes aux procedes de chauffage de bandes d'acier dans des fours verticaux

Publications (1)

Publication Number Publication Date
EP1229138A1 true EP1229138A1 (fr) 2002-08-07

Family

ID=8859476

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02290100A Withdrawn EP1229138A1 (fr) 2001-01-31 2002-01-15 Perfectionnements apportés aux procédés de chauffage de bandes d'acier dans des fours verticaux

Country Status (9)

Country Link
US (1) US6761778B2 (es)
EP (1) EP1229138A1 (es)
JP (1) JP2002302719A (es)
KR (1) KR20020064159A (es)
CN (1) CN100478460C (es)
BR (1) BR0200268A (es)
DE (1) DE1229138T1 (es)
ES (1) ES2180472T1 (es)
FR (1) FR2820148B1 (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2876709A1 (fr) * 2004-10-14 2006-04-21 Kappa Thermline Soc Par Action Procede et dispositif d'amelioration qualitative et quantitative de la production dans un four vertical de traitement de bandes d'acier ou d'aluminium
WO2007125213A2 (fr) * 2006-05-02 2007-11-08 Fives Stein Perfectionnement apporte aux sections de chauffage rapide des lignes de traitement thermique en continu

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2513582B1 (fr) 2009-12-15 2018-05-02 Primetals Technologies France SAS Installation de préchauffage d'une bande d'acier en défilement continu
CN103468919B (zh) * 2013-08-12 2015-05-20 舞阳钢铁有限责任公司 一种减少淬火炉中钢板表面产生辊印的方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2212916A5 (es) * 1972-12-29 1974-07-26 Armco Steel Corp
JPS5779123A (en) * 1980-10-31 1982-05-18 Kawasaki Steel Corp Continuous annealing method for cold rolled steel strip and its device
JPS57110624A (en) * 1980-12-27 1982-07-09 Nippon Steel Corp Method for controlling combustion of continuous annealing furnace
EP0545768A1 (fr) * 1991-11-28 1993-06-09 Sollac Procédé et dispositif de conduite automatique d'un four de recuit continu à rayonnement par tubes radiants
JPH09256075A (ja) * 1996-03-22 1997-09-30 Nippon Steel Corp 連続熱処理炉の均一加熱装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3610592A (en) * 1969-07-29 1971-10-05 United States Steel Corp Method and apparatus for estimating errors in pyrometer readings
US4316717A (en) * 1980-10-27 1982-02-23 Midland-Ross Corporation Method of controlling strip temperatures
US4494929A (en) * 1982-03-19 1985-01-22 Nippon Steel Corporation Continuous heat treatment furnace
JPS61157641A (ja) * 1984-12-28 1986-07-17 Chugai Ro Kogyo Kaisha Ltd 金属ストリツプ用連続焼鈍炉
JPS6260825A (ja) * 1985-09-10 1987-03-17 Kawasaki Steel Corp 鋼帯の連続熱処理における予熱方法
FR2746112B1 (fr) * 1996-03-13 1998-06-05 Procede de traitement thermique en continu de bandes metalliques dans des atmospheres de nature differente
US6238209B1 (en) * 2000-05-17 2001-05-29 Kawasaki Steel Corporation Hearth rolls for heating furnace and soaking furnace of vertical heat treating furnace and vertical heat treating furnace including hearth rolls

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2212916A5 (es) * 1972-12-29 1974-07-26 Armco Steel Corp
JPS5779123A (en) * 1980-10-31 1982-05-18 Kawasaki Steel Corp Continuous annealing method for cold rolled steel strip and its device
JPS57110624A (en) * 1980-12-27 1982-07-09 Nippon Steel Corp Method for controlling combustion of continuous annealing furnace
EP0545768A1 (fr) * 1991-11-28 1993-06-09 Sollac Procédé et dispositif de conduite automatique d'un four de recuit continu à rayonnement par tubes radiants
JPH09256075A (ja) * 1996-03-22 1997-09-30 Nippon Steel Corp 連続熱処理炉の均一加熱装置

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 006, no. 158 (C - 120) 19 August 1982 (1982-08-19) *
PATENT ABSTRACTS OF JAPAN vol. 006, no. 202 (C - 129) 13 October 1982 (1982-10-13) *
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 01 30 January 1998 (1998-01-30) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2876709A1 (fr) * 2004-10-14 2006-04-21 Kappa Thermline Soc Par Action Procede et dispositif d'amelioration qualitative et quantitative de la production dans un four vertical de traitement de bandes d'acier ou d'aluminium
WO2007125213A2 (fr) * 2006-05-02 2007-11-08 Fives Stein Perfectionnement apporte aux sections de chauffage rapide des lignes de traitement thermique en continu
FR2900661A1 (fr) * 2006-05-02 2007-11-09 Stein Heurtey Perfectionnement apporte aux sections de chauffage rapide des lignes de traitement thermique en continu.
WO2007125213A3 (fr) * 2006-05-02 2008-01-03 Stein Heurtey Perfectionnement apporte aux sections de chauffage rapide des lignes de traitement thermique en continu
EA014407B1 (ru) * 2006-05-02 2010-12-30 Фив Стэн Способ нагрева металлической ленты в секции быстрого нагрева линий теплообработки непрерывного действия
US8425225B2 (en) 2006-05-02 2013-04-23 Fives Stein Made to the rapid heating sections of continuous heat-treatment lines

Also Published As

Publication number Publication date
ES2180472T1 (es) 2003-02-16
CN1369569A (zh) 2002-09-18
CN100478460C (zh) 2009-04-15
KR20020064159A (ko) 2002-08-07
DE1229138T1 (de) 2003-01-09
FR2820148A1 (fr) 2002-08-02
JP2002302719A (ja) 2002-10-18
US6761778B2 (en) 2004-07-13
US20020104598A1 (en) 2002-08-08
FR2820148B1 (fr) 2003-10-31
BR0200268A (pt) 2002-10-08

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