EP0761829A1 - Vorrichtung zum Kühlen von Walzgut - Google Patents

Vorrichtung zum Kühlen von Walzgut Download PDF

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Publication number
EP0761829A1
EP0761829A1 EP96401941A EP96401941A EP0761829A1 EP 0761829 A1 EP0761829 A1 EP 0761829A1 EP 96401941 A EP96401941 A EP 96401941A EP 96401941 A EP96401941 A EP 96401941A EP 0761829 A1 EP0761829 A1 EP 0761829A1
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EP
European Patent Office
Prior art keywords
gas
cooling device
orifices
cooling
product
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.)
Granted
Application number
EP96401941A
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English (en)
French (fr)
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EP0761829B1 (de
Inventor
Claude Nivoche
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.)
Andritz Technology and Asset Management GmbH
Original Assignee
Selas SA
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Publication date
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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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • 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
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching
    • 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
    • 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

Definitions

  • the present invention relates to a device for cooling a ferrous or non-ferrous laminated product, in particular a steel strip.
  • US Patent 4,363,471 describes a steel annealing line in which the steel strip passes in front of a box comprising a series of gas blowing nozzles.
  • these nozzles form only small projections on the surface of the box.
  • Gas evacuation, after being in contact with the steel strip, is therefore hampered by the box: back-pressure zones then appear between the nozzles and the box, thus disturbing the projection of the cooling gas towards the steel strip .
  • the gas can only escape laterally along the width of the rolled product, which causes preferential cooling of the edges of the rolled product and can lead to flatness defects.
  • the heat transfer coefficients achieved by this type of device do not exceed 200 kCal / m 2 .h. ° C for a gas composed of a mixture of hydrogen and nitrogen with a hydrogen level of 5%, and even less for air.
  • WO 92/02316 describes a cooling device in which an extruded profile runs horizontally between blade-shaped conduits having gas outlet orifices extending in the transverse direction of the profile. Only the position of the upper and lower blades, staggered with respect to each other, is specified in order to obtain uniform cooling of the profile. However, in this document, the problem of the evacuation of the gas after its impact on the profile is not considered. The impact of the gas on the profile is then disturbed by the gases which stagnate between the blades.
  • the article "Heating and cooling technology in the continuous annealing" by IMOSE indicates that one can obtain a heat transfer coefficient equal to a maximum of 250 kCal / m 2 .h. ° C by increasing the speed and the volume of projected gas, reducing the distance between the rolled product and the blowing nozzles and enriching the gas with hydrogen. This value of the heat transfer coefficient is however insufficient to obtain a really accelerated cooling of the rolled product.
  • Cooling methods Heat transfer coefficient (kCal / m 2 .h. ° C) Cooling rate between 600 and 400 ° C for a 1 mm thick steel strip (° C / s) Remarks By gas jets -normal 100 17 too weak -extreme possible * (* according to IMOSE) 250 42 only for high hydrogen content By passing over cooled rollers 1000 160 serious flatness defects Soaking in hot water ( ⁇ 90 ° C) 400 67 Product oxidation Soaking in cold water 6000 1000 Oxidation of the product and stop of cooling impossible By mist projection 600 100 Product oxidation
  • the object of the present invention is to provide a gas spray cooling device which allows a rolled product to be cooled with a heat transfer coefficient greater than 350 kcal / m 2 .h. ° C, while using a harmless gas.
  • the cooling device targeted by the invention makes it possible to cool a rolled product, in particular a steel strip, passing in front of the device which comprises means for pressurizing gas of at least one box, the box comprising several blades forming a duct. , each blade comprising at least one gas outlet orifice in the direction of at least one of the surfaces of the laminated product, the orifices of each blade being aligned in the transverse direction of the laminated product.
  • this cooling device is characterized in that each space separating two adjacent blades has a depth in a direction perpendicular to the surface of the rolled product and a width in the longitudinal direction of the rolled product sufficient to allow the evacuation of the gas without disturbing the gas outlet of the adjacent blades, the ratio of the gas flow rate in m 3 / s at the outlet of all the orifices of a blade on the section in m 2 of the space separating this blade from one or other of the adjacent blades being less than 20, the section corresponding to a section in a plane perpendicular to the product laminated and parallel to the direction of travel of the laminated product.
  • the circulation of the gas in the cooling device is regular, and the gas can be evacuated without generating preferential cooling of the edges.
  • the cooling device of the invention is therefore perfectly suited to continuous heat treatment, such as that used in continuous steel treatment lines.
  • the depth of each space is greater than 200 mm, and preferably 300 mm.
  • the distance separating the adjacent blades is between 0.8 and 5 times the distance separating each orifice from the same blade.
  • the blades are sufficiently close to each other, at the height of their gas outlet orifices, to uniformly cool the entire surface of the laminated product moving past these outlet orifices.
  • a cooling installation comprising at least one cooling device is characterized in that stabilizing rollers are arranged on either side of the cooling device (s), said rollers being capable of deflecting the rolled product with an angle of less than 7 °.
  • Very high cooling power can thus be obtained, the rollers preventing the rolled product from vibrating under the effect of the pressure of the projected cooling gas.
  • the cooling device according to the invention is intended in particular to be integrated in a continuous annealing line such as that conventionally used for the treatment of steel strips.
  • These steel strips have a thickness of between 0.15 and 2.3 mm. Their width is of the order of 0.6 to 2 m.
  • the rolled product 1 passes by vertical passes in the direction of the arrow F between transport rollers 2.
  • the cooling device comprises means for pressurizing gas 4 of a box 1.
  • the box 1 extends parallel to the surface of the rolled product and is supplied by at least one fan 4 intended to introduce a high flow rate of cooling gas 5 under pressure into the box.
  • at least one fan 4 intended to introduce a high flow rate of cooling gas 5 under pressure into the box.
  • several supply fans could be used and distributed evenly over the height of the cabinet. We could also replace the fan with a compressor.
  • the device of the invention comprises a second box 10, positioned symmetrically with respect to the rolled product, so that the latter is cooled on these two faces opposite at the same time.
  • the box comprises several blades forming a duct 11, outlet orifices 12 for the gas 5 towards the surface of the laminated product 1 being provided at the end of these blades 11.
  • the orifices 12 of each blade 11 are aligned in the transverse direction of the rolled product 1.
  • each space 13 separating two adjacent blades has a depth P in a direction perpendicular to the surface of the rolled product 1 and a width L in the longitudinal direction of the rolled product 1 sufficient to allow gas evacuation 5.
  • Each orifice 12 opens at the end of a conduit formed by a blade 11 extending from the box 10 in the direction of the laminated product.
  • the gas 5 can escape backwards after its contact on the rolled product, between the different blades.
  • cooling must be carried out under a protective atmosphere, such as for example a mixture of nitrogen and hydrogen
  • the entire cooling device is surrounded in a known manner by 'A sealed envelope for recovering the sprayed gas in order to recycle it continuously in the gas pressurization means. Recycling includes a gas recovery step, a gas cooling step and a reinjection step.
  • the gas temperature in the box is less than 100 ° C.
  • the distance D existing between the adjacent blades 11 is between 0.8 and 5 times the distance d separating each orifice 12 of the same blade 11. This distance D corresponds to the distance separating the blades 11, in the direction F of travel , at the height of the outlet orifices 12.
  • each orifice 12 of the same series is uniform.
  • the distance D between two adjacent blades is between 30 and 200 mm.
  • the orifices can be aligned in the longitudinal direction of the rolled product so that they form the four corners of contiguous squares.
  • the orifices can also be arranged in staggered rows, as shown in FIG. 1 and thus form the corners of contiguous diamonds.
  • the distribution of the cooling gas jets is therefore uniform over the entire surface of the rolled product.
  • the holes are circular, rectangular, oblong, etc. holes, or small slots.
  • Each blade may also have only one outlet opening forming a slit opposite the laminated product.
  • each separation space 13 is greater than 200 mm, and preferably greater than 300 mm.
  • Section S corresponds to the section in a plane perpendicular to the rolled product and parallel to the direction of travel of this product.
  • the equivalent diameter of the orifices 12 can be between 5 and 15 mm: the equivalent diameter corresponds to the diameter of the circle having an area equal to that of the section of the orifice.
  • the cooling device it is advantageous to arrange the cooling device so that the outlet orifices 12 are at a distance 1 from the surface of the rolled product 1 of between five and twelve times the equivalent diameter of the orifice 12 , and preferably between six and eight times the equivalent diameter.
  • the boxes 10 can be movable in a direction perpendicular to the rolled product 1, so as to be able to be brought close to or away from the rolled product.
  • each blade forming a conduit 11 has a section which decreases in the direction of passage of the gas, that is to say from the box to the outlet orifice 12.
  • the outlet orifice 12 is profiled so that its section is substantially the same as the outlet section of the blade 11. This construction makes it possible to obtain a gas at high speed at the outlet while limiting parasitic pressure losses
  • the blades and the orifices can be manufactured indifferently by molding, forming, stamping, assembly and / or machining.
  • a cooling installation comprises at least one cooling device 21.
  • Stabilizing rollers 20 are arranged on either side of the cooling device (s) 21, the rollers being adapted to cause deflection of 7 ° or less of the rolled product 1.
  • rollers limit the vibration of the product, especially when the distance 1 between the orifices 12 of this product is small.
  • These rollers are movable laterally, that is to say perpendicular to the rolled product, to align the latter and are motorized to drive the product in movement.
  • the distance separating in height two series of rollers 20 is less than or equal to 6 m and the height of a stack of conduits in the same device 21 is less than or equal to 5 m. This limits the vibrations of the product as well as possible while obtaining very high cooling power.
  • the cooling device preferably comprises a number of blades superimposed in the longitudinal direction of the rolled product and each blade has a number of orifices 12 such that the total section of openings of the device is between 1 and 5% of the covered area. by all of the blades, and preferably between 2 and 4% of this surface.
  • the cooling device comprises at least one box 10 disposed on each side of the rolled product.
  • it comprises several boxes 10a, 10b arranged on the same side of the rolled product 1.
  • the gas used consists of a mixture of hydrogen and nitrogen, the proportion of hydrogen preferably being less than or equal to 5%.
  • This gas can also be air or pure nitrogen.
  • the cooling device it is possible to cool a steel strip with a thickness of 0.8 mm with a cooling rate greater than 80 ° C./s, that is to say corresponding to a transfer coefficient at least equal to 400kCal / m 2 .h. ° C.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Metal Rolling (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Continuous Casting (AREA)
EP96401941A 1995-09-12 1996-09-11 Vorrichtung zum Kühlen von Walzgut Revoked EP0761829B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9510669 1995-09-12
FR9510669A FR2738577B1 (fr) 1995-09-12 1995-09-12 Dispositif de refroidissement d'un produit lamine

Publications (2)

Publication Number Publication Date
EP0761829A1 true EP0761829A1 (de) 1997-03-12
EP0761829B1 EP0761829B1 (de) 2000-12-06

Family

ID=9482468

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96401941A Revoked EP0761829B1 (de) 1995-09-12 1996-09-11 Vorrichtung zum Kühlen von Walzgut

Country Status (7)

Country Link
US (1) US5871686A (de)
EP (1) EP0761829B1 (de)
KR (1) KR100441365B1 (de)
AT (1) ATE197968T1 (de)
AU (1) AU709914B2 (de)
DE (2) DE761829T1 (de)
FR (1) FR2738577B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1011087A3 (fr) * 1997-04-04 1999-04-06 Cockerill Sambre Sa Dispositif de refroidissement de tole dans une ligne continue.
FR2789757A1 (fr) * 1999-02-16 2000-08-18 Selas Sa Dispositif d'echange de chaleur avec un produit plat
WO2007014406A1 (de) * 2005-08-01 2007-02-08 Ebner Industrieofenbau Gesellschaft M.B.H. Vorrichtung zum kühlen eines metallbandes
EP2100673A1 (de) * 2008-03-14 2009-09-16 ArcelorMittal France Verfahren und Vorrichtung zum Blasen von Gas auf ein laufendes Band

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT502239B1 (de) * 2005-08-01 2007-07-15 Ebner Ind Ofenbau Vorrichtung zum kühlen eines metallbandes
JP2013185217A (ja) * 2012-03-08 2013-09-19 Nippon Steel & Sumikin Engineering Co Ltd 鋼帯の冷却装置
EP2933342A1 (de) * 2014-04-15 2015-10-21 Böhler-Uddeholm Precision Strip GmbH Verfahren und Vorrichtung zur Herstellung eines Bandstahls mit bainitischer Gefügestruktur
WO2016192993A1 (de) * 2015-05-29 2016-12-08 Voestalpine Stahl Gmbh Verfahren zum kontaktlosen kühlen von stahlblechen und vorrichtung hierfür
DE102017111991B4 (de) 2017-05-31 2019-01-10 Voestalpine Additive Manufacturing Center Gmbh Vorrichtung zum Kühlen von heißen, planen Gegenständen
WO2019097711A1 (ja) * 2017-11-20 2019-05-23 Ｐｒｉｍｅｔａｌｓ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｊａｐａｎ株式会社 金属板の冷却装置及び金属板の連続熱処理設備
RU184481U1 (ru) * 2018-01-10 2018-10-29 Федеральное государственное бюджетное учреждение науки "Удмуртский федеральный исследовательский центр Уральского отделения Российской академии наук", RU Щелевой спрейер для создания охлаждающей газожидкостной среды при термообработке осесимметричных заготовок
DE102018109579A1 (de) * 2018-04-20 2019-10-24 Schwartz Gmbh Temperiervorrichtung zur partiellen Kühlung eines Bauteils

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1337313A (fr) * 1962-07-04 1963-09-13 Electric Furnace Co Dispositif de refroidissement forcé pour fours continus à bandes
US3262688A (en) * 1965-06-03 1966-07-26 Midland Ross Corp Jet convection heat transfer
JPS57171627A (en) * 1981-04-17 1982-10-22 Mitsubishi Heavy Ind Ltd Gaseous jet cooler for steel strip
JPS57188624A (en) * 1981-05-15 1982-11-19 Mitsubishi Heavy Ind Ltd Heat treating device for band steel plate
EP0145847A1 (de) * 1983-09-08 1985-06-26 ITALIMPIANTI Società Italiana Impianti p.a. Vorrichtung zur Umwälzung und Kühlung des Gases in kontinuierlichen Bandöfen
EP0182050A2 (de) * 1984-11-14 1986-05-28 Nippon Steel Corporation Bandkühlanlage zur Verwendung in einem Durchlaufglühofen
US4704167A (en) * 1985-02-21 1987-11-03 Nippon Steel Corporation Method and apparatus for cooling steel strip
WO1992002316A1 (de) * 1990-08-02 1992-02-20 Wsp Ingenieurgesellschaft Für Wärmetechnik, Strömungstechnik Und Prozesstechnik Mbh Vorrichtung zur abkühlung von strangpressprofilen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5946291A (ja) * 1982-09-10 1984-03-15 Toubishi Yakuhin Kogyo Kk セフアゾリン及びその無毒性塩の新規製造方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1337313A (fr) * 1962-07-04 1963-09-13 Electric Furnace Co Dispositif de refroidissement forcé pour fours continus à bandes
US3262688A (en) * 1965-06-03 1966-07-26 Midland Ross Corp Jet convection heat transfer
JPS57171627A (en) * 1981-04-17 1982-10-22 Mitsubishi Heavy Ind Ltd Gaseous jet cooler for steel strip
JPS57188624A (en) * 1981-05-15 1982-11-19 Mitsubishi Heavy Ind Ltd Heat treating device for band steel plate
EP0145847A1 (de) * 1983-09-08 1985-06-26 ITALIMPIANTI Società Italiana Impianti p.a. Vorrichtung zur Umwälzung und Kühlung des Gases in kontinuierlichen Bandöfen
EP0182050A2 (de) * 1984-11-14 1986-05-28 Nippon Steel Corporation Bandkühlanlage zur Verwendung in einem Durchlaufglühofen
US4704167A (en) * 1985-02-21 1987-11-03 Nippon Steel Corporation Method and apparatus for cooling steel strip
WO1992002316A1 (de) * 1990-08-02 1992-02-20 Wsp Ingenieurgesellschaft Für Wärmetechnik, Strömungstechnik Und Prozesstechnik Mbh Vorrichtung zur abkühlung von strangpressprofilen

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007, no. 014 (C - 146) 20 January 1983 (1983-01-20) *
PATENT ABSTRACTS OF JAPAN vol. 007, no. 034 (C - 150) 10 February 1983 (1983-02-10) *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1011087A3 (fr) * 1997-04-04 1999-04-06 Cockerill Sambre Sa Dispositif de refroidissement de tole dans une ligne continue.
FR2789757A1 (fr) * 1999-02-16 2000-08-18 Selas Sa Dispositif d'echange de chaleur avec un produit plat
EP1029933A1 (de) * 1999-02-16 2000-08-23 Selas SA Vorrichtung zum Wärmetauschen mit einem flachen Produkt
US6358465B1 (en) 1999-02-16 2002-03-19 Selas Sa Device for exchanging heat with a flat product
WO2007014406A1 (de) * 2005-08-01 2007-02-08 Ebner Industrieofenbau Gesellschaft M.B.H. Vorrichtung zum kühlen eines metallbandes
US7968046B2 (en) 2005-08-01 2011-06-28 Ebner Industrieofenbau Ges.M.B.H Apparatus for cooling a metal strip
EP2100673A1 (de) * 2008-03-14 2009-09-16 ArcelorMittal France Verfahren und Vorrichtung zum Blasen von Gas auf ein laufendes Band
WO2009112654A1 (fr) * 2008-03-14 2009-09-17 Arcelormittal France Procédé et dispositif de soufflage de gaz sur une bande en défilement
US8591675B2 (en) 2008-03-14 2013-11-26 Arcelormittal France Method and device for blowing gas on a running strip
AU2008352731B2 (en) * 2008-03-14 2014-06-19 Arcelormittal France Method and device for blowing gas on a running strip
US9222700B2 (en) 2008-03-14 2015-12-29 Arcelormittal France Method and device for blowing gas on a running strip

Also Published As

Publication number Publication date
EP0761829B1 (de) 2000-12-06
KR970015759A (ko) 1997-04-28
ATE197968T1 (de) 2000-12-15
FR2738577A1 (fr) 1997-03-14
DE69611129T2 (de) 2001-06-21
AU6556996A (en) 1997-03-20
KR100441365B1 (ko) 2004-09-30
US5871686A (en) 1999-02-16
DE69611129D1 (de) 2001-01-11
FR2738577B1 (fr) 1998-03-13
DE761829T1 (de) 1997-11-20
AU709914B2 (en) 1999-09-09

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