US20100186940A1 - Method, Device and System for the Heat Treatment of a Moving Metal Strip - Google Patents

Method, Device and System for the Heat Treatment of a Moving Metal Strip Download PDF

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Publication number
US20100186940A1
US20100186940A1 US12/668,534 US66853408A US2010186940A1 US 20100186940 A1 US20100186940 A1 US 20100186940A1 US 66853408 A US66853408 A US 66853408A US 2010186940 A1 US2010186940 A1 US 2010186940A1
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United States
Prior art keywords
strip
heat
segment
metal strip
roller
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Abandoned
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US12/668,534
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English (en)
Inventor
Jean Marc Raick
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Drever International SA
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Individual
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Assigned to DREVER INTERNATIONAL S.A. reassignment DREVER INTERNATIONAL S.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RAICK, JEAN MARC
Publication of US20100186940A1 publication Critical patent/US20100186940A1/en
Abandoned 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/28—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity for treating continuous lengths of work

Definitions

  • the present invention relates to a method, device and system for the heat treatment of a moving metal strip.
  • One type of heat treatment method is the one known as annealing.
  • an annealing method the metal is heated in order to reach temperatures ranging for example from 500° C. to 1100° C. and then cooled in order to modify the crystalline structure of the metal.
  • One drawback of such a method, as well as other heat treatment methods, is its high consumption of energy.
  • steel production it is frequently necessary to anneal sheets after prior cooling, for example in the case of cold rolling.
  • the heating of the sheet is obtained by passing it in front of radiant tubes in which fume gases circulate coming from the combustion of a fuel and air.
  • the heat consumed is, despite this recovery, around 1.7 times the heat found in the metal sheet, which corresponds to an efficiency of 60%.
  • the cooling gas is blown in a cascade onto the tubes, from one cooling step to the previous one, as described in the international patent application WO 00/25076,
  • This method although efficient in theory, cannot be put into industrial practice on sheet-metal annealing lines with a high heating capacity, more than around 40 t/hour. It is in fact impossible to effectively collect the gas flows heated and cooled successively in the various sections of the cascade.
  • Such a regenerative method comprises heating of the strip, cooling of the heated strip, and transfer of heat from at least one segment of the strip being cooled to at least one segment of the strip being heated, so as to effect at least some of each of the said cooling and heating of the strip.
  • the said heat transfer is effected by circulation of a heat-transfer gas.
  • This has the drawbacks of offering only a reduced heat transfer rate and requiring a supplementary addition of energy in order to actuate the circulation of the heat-transfer gas.
  • any gain in transfer of heat is more than compensated for by the additional work necessary for making the gas circulate more quickly.
  • the problem to be solved is therefore the reduction in the energy consumption in a method of heat treatment of a moving metal strip.
  • this problem is solved by effecting the said transfer of heat mainly by conduction.
  • the heat is transmitted very effectively without requiring a high supplementary addition of energy in the form of work.
  • the transfer heat by conduction is the most effective form of heat transfer.
  • the said heat transfer is effected from a plurality of segments of the strip being heated to a plurality of segments of the strip being cooled in reverse order in the direction of travel of the strip.
  • the said heat transfer is effected from a plurality of segments of the strip being heated to a plurality of segments of the strip being cooled in reverse order in the direction of travel of the strip.
  • the strip is also heated by a source of heat external to the strip.
  • a thermal differential serving to impel the said heat transfer is created between the strip being cooled and the strip being heated.
  • the said heat transfer is effected by means of at least one heat-conducting solid element in contact with a segment of the strip being heated and a segment of the strip being cooled.
  • the heat conduction between the segment of the strip being heated and the segment of the strip being cooled is provided by the said solid element.
  • the said at least one heat-conducting solid element is in the form of a roller, preferably metal.
  • a roller can provide continuous contact, and therefore good conduction of heat, with the two segments of the moving strip.
  • the segment of the strip being cooled is in contact with the said roller at a contact angle of at least 20′, preferably at least 30°. With such a contact angle, it is possible to offer a good contact surface between roller and strip, and therefore good heat transfer.
  • the segment of the strip being heated is in contact with the said roller at a contact angle of at least 20°, preferably at least 30°.
  • the temperature difference between a segment of metal strip being cooled and a segment of strip being heated between which at least some of the said heat transfer takes place by conduction is at least 200° C. and/or below 500° C. Such a temperature difference would allow effective heat transfer, without causing excessive thermal shock in the metal strip.
  • the present invention also relates to a heat transmission device for simultaneously heating a moving metal strip upstream of an additional heating zone and cooling it downstream of the said additional heating zone.
  • the device comprises at least one heat-conducting solid element intended to be in contact with the said metal strip both upstream and downstream of the main heating zone, so as to transfer heat by conduction between at least one segment of the metal strip downstream and at least one segment of the metal strip upstream.
  • the device comprises a series of several solid heat conducting elements, for example five, for successively contacting the said metal strip both upstream and, in reverse order in the direction of travel of the strip, downstream of the main heating zone, so as to transfer heat by conduction between segments of the metal strip downstream and segments of the metal strip upstream.
  • solid heat conducting elements for example five, for successively contacting the said metal strip both upstream and, in reverse order in the direction of travel of the strip, downstream of the main heating zone, so as to transfer heat by conduction between segments of the metal strip downstream and segments of the metal strip upstream.
  • the device also comprises at least one deflector roller in order to define a contact angle, preferably at least 20°, between the said metal strip upstream and/or downstream of the furnace and the said heat-conducting solid element in the form of a roller.
  • the present invention also relates to a system for the continuous heat treatment, in particular annealing, of a moving metal strip comprising a main heating zone and a heat-transmission device according to the invention.
  • FIG. 1 shows a diagram of a prior method
  • FIG. 2 shows a diagram of a method according to an embodiment of the invention
  • FIG. 3 shows a heat treatment system according to an embodiment of the invention
  • FIG. 4 shows a heat treatment system according to an alternative embodiment of the invention
  • FIG. 5 shows a heat transmission device according to an embodiment of the invention
  • FIG. 6 shows curves for heating and cooling the metal strip that can be obtained with the heat transmission device of FIG. 5 .
  • FIG. 1 a conventional method for the continuous annealing of a moving steel strip is illustrated schematically. After cleaning 1 of the strips, the latter is heated from 30° C. to 800° C. in a heating step 2 in a radiant tube furnace. This specifies an energy addition Q of 210 kW per tonne of steel, in the form of natural gas, producing by its combustion 50 kg of CO2 and 80 mg of NOx per tonne of steel.
  • FIG. 2 an embodiment of the method of the present invention is shown schematically.
  • the steel strip is heated after cleaning 1 .
  • the heating is divided into a preheating step 2 a in which the steel strip is preheated from 30° C. to 450° C., and a main heating step 2 b in a radiant-tube furnace, in which the strip is heated from 450° C. to 800° C.
  • the heat Q′ transferred to the strip in the preheating strip 2 a comes from the cooling 3 of the same strip from 800° C. to 450° C. and is transmitted by conduction.
  • FIG. 3 shows a system 4 for the continuous annealing of a moving steel strip 5 , according to one embodiment of the invention.
  • This system 4 comprising a device 6 for transmitting heat by conduction for the preheating 2 a and cooling 3 of the strip 5 , and a furnace 7 with radiant tubes 8 for the additional heating 2 b of the strip 5 .
  • the furnace 7 with radiant tubes 8 is of the vertical type.
  • the alternative of a horizontal arrangement of the furnace 7 with radiant tubes 8 can also be considered, as illustrated in FIG. 4 .
  • the heat-transmission device 6 is illustrated in greater detail in FIG. 5 .
  • the strip 5 enters the device 6 through the entry opening 9 and passes through the said device 6 in the direction 10 as far as the furnace 7 while being preheated. After the main heating 2 b, the strip 5 leaves the furnace again and passes through the device 6 in the opposite direction 11 as far as the exit opening 12 while cooling.
  • the device 6 comprises an alignment of seven heat-conducting rollers 6 and two alignments of six deflector rollers 14 , one on each side of the alignment of conductive rollers 13 .
  • both the conductive rollers 13 and the deflector rollers 14 have a diameter of 800 mm.
  • the conductive rollers 13 must have a diameter capable of providing a good contact surface with the strip 5 with a relatively low speed of rotation, while avoiding a plastic deformation of the strip 5 .
  • the deflector rollers 14 must also have a diameter avoiding plastic deformation of the strip 5 . According to the geometric and mechanical parameters of the strip 5 , the conductive 13 and deflector 14 rollers may therefore have diameters situated, for example, in a range between 400 and 1600 mm.
  • the speed of the strip 5 during cooling is normally greater than its speed during heating.
  • the conductive roller 13 could have an angularly variable radius making it possible to adjust the effective radius of the conductive roller 13 to the speed of the strip 5 on each side of the conductive roller 13 .
  • Another solution that can be envisaged is that the conductive roller 13 is divided into radial segments, having a certain freedom of angular movement relative to one another.
  • each conductive roller 13 thus transfers heat by conduction from a segment 5 b of the strip 5 during cooling to a segment 5 a of the strip during heating.
  • the strip 5 contacts the conductive rollers 13 in reverse order in its travel during heating and during cooling.
  • Table 1 presents the parameters of an embodiment of the heat treatment method of the invention in the device 6 described above with a strip 5 with a thickness of 1 mm, a width of 1500 mm and a travel speed of 150 m/min for a production of 106 tonnes per hour.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Tunnel Furnaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
US12/668,534 2007-07-12 2008-07-08 Method, Device and System for the Heat Treatment of a Moving Metal Strip Abandoned US20100186940A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BE2007/0348 2007-07-12
BE2007/0348A BE1017683A3 (fr) 2007-07-12 2007-07-12 Procede, dispositif et systeme de traitement thermique d'une bande metallique en defilement.
PCT/EP2008/058835 WO2009007362A1 (fr) 2007-07-12 2008-07-08 Procède, dispositif et systeme de traitement thermique d'une bande metallique en defilement

Publications (1)

Publication Number Publication Date
US20100186940A1 true US20100186940A1 (en) 2010-07-29

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US12/668,534 Abandoned US20100186940A1 (en) 2007-07-12 2008-07-08 Method, Device and System for the Heat Treatment of a Moving Metal Strip

Country Status (9)

Country Link
US (1) US20100186940A1 (fr)
EP (1) EP2171105B1 (fr)
CN (1) CN101743331B (fr)
AT (1) ATE488608T1 (fr)
BE (1) BE1017683A3 (fr)
DE (1) DE602008003585D1 (fr)
ES (1) ES2355695T3 (fr)
PL (1) PL2171105T3 (fr)
WO (1) WO2009007362A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015533389A (ja) * 2012-10-19 2015-11-24 マシーネンファブリーク・ニーホフ・ゲーエムベーハー・ウント・コー・カーゲー 細長いストランド形状の材料の生産中の熱移動のための装置
US20180153063A1 (en) * 2015-06-19 2018-05-31 Yamaha Hatsudoki Kabushiki Kaisha Component mounting device and component mounting method
US11131001B2 (en) 2015-08-13 2021-09-28 Ebner Industrieofenbau Gmbh Oven device for heat-treating a metal blank

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2459758B1 (fr) 2009-07-27 2016-09-14 Tata Steel Nederland Technology B.V. Traitement thermique de bande assisté par un caloduc
EP3181538B1 (fr) 2015-12-15 2024-04-17 Fertinagro Biotech, S.L. Utilisation d'une composition d'engrais comprenant des ions de cuivre, fer et manganèse complexés avec des acides aminés pour améliorer la solubilisation de phosphore par des micro-organismes présents dans le sol
CN109797278A (zh) * 2019-03-20 2019-05-24 安徽智磁新材料科技有限公司 超薄纳米晶带材多级热处理装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4571274A (en) * 1982-10-28 1986-02-18 Kawasaki Steel Corporation Method for continuous annealing of a metal strip
US4588378A (en) * 1983-11-18 1986-05-13 Chugai Ro Co., Ltd. Continuous heat treating furnace for metallic strip
EP0188659A2 (fr) * 1984-11-27 1986-07-30 Aichelin GmbH Four industriel pour le traitement thermique d'articles en continu

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2224848Y (zh) * 1995-01-27 1996-04-17 杨兴全 一种传导传热方式薄钢板淬火加热装置
DE19849757A1 (de) * 1998-10-28 2000-05-04 Vinz Peter Kontinuierlich betriebener Rollenherdofen mit nachgeordneter zwangskonvektiver Glühgutabkühlung
BE1015309A3 (fr) * 2003-01-14 2005-01-11 Drever Internat S A Procede de recuit de tole metallique.
FR2876709B1 (fr) * 2004-10-14 2007-07-27 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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4571274A (en) * 1982-10-28 1986-02-18 Kawasaki Steel Corporation Method for continuous annealing of a metal strip
US4588378A (en) * 1983-11-18 1986-05-13 Chugai Ro Co., Ltd. Continuous heat treating furnace for metallic strip
EP0188659A2 (fr) * 1984-11-27 1986-07-30 Aichelin GmbH Four industriel pour le traitement thermique d'articles en continu

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
http://www.aos.wisc.edu/~aalopez/aos101/wk5.html, 09-2006. *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015533389A (ja) * 2012-10-19 2015-11-24 マシーネンファブリーク・ニーホフ・ゲーエムベーハー・ウント・コー・カーゲー 細長いストランド形状の材料の生産中の熱移動のための装置
US20180153063A1 (en) * 2015-06-19 2018-05-31 Yamaha Hatsudoki Kabushiki Kaisha Component mounting device and component mounting method
US11131001B2 (en) 2015-08-13 2021-09-28 Ebner Industrieofenbau Gmbh Oven device for heat-treating a metal blank

Also Published As

Publication number Publication date
DE602008003585D1 (de) 2010-12-30
EP2171105A1 (fr) 2010-04-07
ATE488608T1 (de) 2010-12-15
WO2009007362A1 (fr) 2009-01-15
CN101743331A (zh) 2010-06-16
EP2171105B1 (fr) 2010-11-17
BE1017683A3 (fr) 2009-03-03
ES2355695T3 (es) 2011-03-30
PL2171105T3 (pl) 2011-06-30
CN101743331B (zh) 2012-03-28

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AS Assignment

Owner name: DREVER INTERNATIONAL S.A., BELGIUM

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:RAICK, JEAN MARC;REEL/FRAME:023767/0024

Effective date: 20091130

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION