EP0418166A1 - Kühlvorrichtung mit Kontaktrollen zum kontinuierlichen Abschrecken von vorgewärmtem Stahlband - Google Patents

Kühlvorrichtung mit Kontaktrollen zum kontinuierlichen Abschrecken von vorgewärmtem Stahlband Download PDF

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Publication number
EP0418166A1
EP0418166A1 EP90402542A EP90402542A EP0418166A1 EP 0418166 A1 EP0418166 A1 EP 0418166A1 EP 90402542 A EP90402542 A EP 90402542A EP 90402542 A EP90402542 A EP 90402542A EP 0418166 A1 EP0418166 A1 EP 0418166A1
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EP
European Patent Office
Prior art keywords
strip
rollers
quenching
spacer
gas
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Withdrawn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
EP90402542A
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English (en)
French (fr)
Inventor
Charles Brun
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.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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 Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0418166A1 publication Critical patent/EP0418166A1/de
Withdrawn legal-status Critical Current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
    • C21D9/573—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
    • 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
    • C21D9/5735—Details
    • C21D9/5737—Rolls; Drums; Roll arrangements

Definitions

  • the present invention relates to a cooling device by contact of rollers for the continuous quenching of a preheated steel strip.
  • a cooling device which comprises a substantially parallelepiped frame provided with a set of parallel transverse rollers rotating around their longitudinal axis.
  • This roller assembly generally consists, on the one hand, of two blocks of rollers with fixed bearings for driving and tensioning the strip on which the steel strip to be treated is moved at a predetermined speed and, d on the other hand, a series of quenching rollers with sliding bearings placed between the two drive and tension blocks, on either side of the strip to be treated.
  • the quenching is carried out by the quenching rollers which are, for this purpose cooled and which can move on the sliding bearings to modify the contact surface with said strip.
  • the cooling of the rollers is essentially obtained by a circulation of water.
  • the contact angle of the strip with each roll is adjusted by modifying the position of the bearings, which causes a variation in the strip-roll contact surface.
  • the cooling water flow is invariant and must be provided sufficient to maintain the water temperature between 20 ° and 40 ° C whatever the speed of movement of the strip.
  • the current practice consists in acting on the temperature at the inlet of the roll quenching, to control the temperature at the inlet of the overaging. Consequently, the temperature at the inlet of the roller quench cannot be brought under control, which prohibits the carrying out of cooling cycle at controlled speed.
  • Roller quenching by cooling the rollers, only with water, has made it possible to treat a large number of steel strips, the thickness of which may vary between 0.7 and 1.52 mm and the width of which may also vary. between 789mm and 1519mm.
  • the cooling decreases with the thickness of the strip, from 200 ° C. maximum for a thickness greater than 1.3 mm to 120 ° C. maximum for a thickness equal to 0.7 mm.
  • the cooling setpoint from 600 ° C to 400 ° C is not respected. This is not due to a lack of cooling capacity since at most 1.5 m of strip-cylinder contact length is used, while the effective length of contact between the strip and the cylinder may be greater than 7.5 m.
  • the efficiency of roller cooling can be precisely evaluated, this efficiency depending on the value of a heat exchange coefficient K.
  • the heat exchange coefficient K is between 3500 and 6000 Kcal / m2 xhx ° C and believes when the thickness of the strip decreases or when the tension of the strip in the roll quench increases.
  • the subject of the invention is a device for cooling by contact with rollers which avoids the aforementioned drawbacks by making it possible to reduce the heat exchange coefficient strip-rolls, to control the cooling of the quenching roller by adjusting the heat exchange coefficient , increase the strip-roller contact length and reduce the cooling rate, which results in better use of roller quenching, increasing the effective cooling capacity of the line and allowing quenching cycles to more than 50 ° C per second between 650 ° and 800 ° C and 300 ° and 350 ° C, essential for hardening very high strength steel.
  • the device for cooling by contact with rollers is characterized in that the quenching rollers comprise a cylindrical core and a sheath formed by two concentric rings delimiting at their interface an inter stice calibrated for a circulation of a fluid of selected thermal conductivity, the outer ring being hooped on the inner ring so as to keep the thickness of the gap substantially constant, for a temperature variation between the two rings of at least 300 ° C.
  • the thickness of the gap is defined by at least one spacer, - the spacer is formed by at least one ring, - the spacer has the shape of a helix, - the spacer is formed by several sectors defining between them a space for the passage of the fluid, the spacer is made of a thermal insulating material resistant to compression such as for example a ceramic or more particularly a zirconia, the spacer is inserted into at least one groove formed on the external face of the internal crown or on the internal face of the external crown, the fluid of thermal conductivity chosen is a gas such as, for example, hydrogen or nitrogen or a mixture of these two gases in a proportion making it possible to adjust the tape-roll heat exchange coefficient, - The gas of thermal conductivity chosen is conditioned under pressure in bottles placed inside the roller, the composition and the flow rate of the gas being regulated by a remote-controlled valve.
  • the cooling device designated as a whole by the reference 1 consists of a frame 3 substantially parallelepipedic provided with a set of transverse parallel rollers rotating around their longitudinal axis and on which a steel strip 10 to be treated is moves at a determined speed.
  • the frame 3 comprises a first zone 4 constituted by a block of three rollers 7 with fixed bearings for tensioning the strip 10, a second zone 5, called the quenching zone, in which are placed quenching rollers 2 mounted on sliding bearings 2a in order to be able to adjust the angle of contact of the strip-quenching rollers, and a third zone 6 in which is arranged another block of three rollers 7 with fixed bearings to reduce the tension of the belt 10 to another value.
  • two rollers 9 with a fixed axis define a horizontal position of the steel strip 10 when the rollers 2 are in the retracted position as shown in dotted lines in FIG. 1, that is to say without contact with the strip 10.
  • the rollers 2 can move to a position 2 ′ shown in solid lines in FIG. 1 to come into contact with the stretched strip between the rollers 9.
  • the controlled movement of the rollers 2 makes it possible to vary the contact surface strip 10 - quenching rollers 2 and to control the heat exchange.
  • the contact angle of the strip 10 with each roller is adjusted by modifying the position of the bearings 2a.
  • Figs. 2 and 3 are two sectional views, one transverse, the other longitudinal, of a quenching roller 2 on which it has been shown for clarity, the steel strip 10 to be treated in contact with the wall outside of the roller.
  • Each quenching roller 2 consists of a cylindrical core 20 on which is placed a sheath 21 formed of two concentric rings, an external ring 22 and an internal ring 23 delimiting at their interface a calibrated gap 24 intended for passage, laminar flow of a fluid of selected thermal conductivity.
  • the fluid can be constituted by pure hydrogen, by pure nitrogen by a mixture of hydrogen and nitrogen, the use of these two gases making it possible to vary the thermal exchange coefficient between 4000 and 800 k / cal / m2 xhx ° C.
  • an intermediate material is inserted in the gap 24 in the form of a spacer 30.
  • the spacer 30 consists of rings 31 formed of several sectors 32 defining between them a space 33 to allow the flow of the fluid gas circulating in the gap 24.
  • the spacer 30 has the shape of a propeller 34 formed of several sectors of propellers 35 also defining between them a space 36 to allow the flow of the fluid gas circulating in the interstice 24.
  • the material used for the manufacture of the spacer 30 is a thermal insulator resistant to compression at temperatures up to 500 ° C., such as for example a ceramic and more particularly a zirconia.
  • the spacer 30 can be embedded in one or more grooves 25 machined either on the external face of the internal crown 23 as in the embodiment shown in FIG. 2, or on the internal face of the external crown 22.
  • a set of grooves 25 forming grooves 2 mm deep and 5 mm thick wide with a distance of 25mm between the grooves allows to embed spacers in the form of rings 31 formed of several sectors 32 of section 5mm x 2.1mm.
  • a set of grooves 25 of 2mm deep and 5mm wide with a pitch of 125mm, and a distance of 25mm between the grooves makes it possible to fit spacers of section 5mm x 2 , 1mm apart from each other by 20mm.
  • the calibrated gap 24 can be obtained by machining the internal face of the external ring 22 or the external face of the internal ring 23.
  • the quenching rollers 2 are cooled by a circulation of water whose flow is invariant and must be provided sufficient to maintain the temperature of the water between 20 ° and 40 °. C whatever the speed and the thickness of the steel strip 10. It is necessary to ensure the passage of the cooling water by limiting the deformations and by eliminating the risk of buckling of the internal crown 23.
  • the cylindrical core 20 comprises a helical channel 26, the partitions 27 forming the helix being able to withstand the pressure transmitted by the internal crown 23.
  • the water channel 26 in a helix with a pitch of 125mm is partitioned into several passages of 20 x 20 mm in section, fed in parallel and separated by the partitions 27 of 5 mm thick.
  • Radial slots can be arranged to limit the radial stresses in said partitions, the slots forming between them an angle less than 30 °.
  • the outer ring 22 can be hooped on the inner ring 23, so as to keep the thickness of the gap 24 substantially constant for a temperature variation, between the two rings of at least 300 ° C.
  • the temperature difference between the two rings 22 and 23 can reach 300 ° C.
  • the dimension of the gap 24 must be kept constant, the outer ring 22 must be shrunk onto the inner ring 23 with a shrinking ⁇ T greater than 300 ° C.
  • the hooping pressure is transmitted to the internal crown 23 without the contact zones constituting thermal bridges when the roller 2 operates with pure nitrogen.
  • a core 20 and an inner ring 23 in phosphorous bronze (elastic module 105,000 MPa, expansion coefficient 1.78 10 ⁇ 5), an outer ring 22 in steel, hooped with a ⁇ T of 300 ° C, are used.
  • the choice of a material with a lower elastic modulus for the internal crown 23 and for the core 20 of the roller will have the effect of reducing the hoop stresses.
  • maximum stresses of 400 MPa will be obtained in tension in the external crown 22 and of 270 MPa in compression in the internal crown 23.
  • the spacers 30 embedded undergo a maximum pressure of 100 MPa, and define a gap 24 of about 0.1mm for the passage of the fluid of selected conductivity.
  • the flow of fluid such as for example a gas such as hydrogen or nitrogen can be reduced (20 liters per hour) and the interstice 24 is supplied with gas from bottles, not shown, placed inside the quenching roller .
  • the gas flow is regulated using a circuit not shown, comprising: - a regulator for each bottle. - a two-way regulating valve for regulating the flow of each gas from 0 to 20 liters / hour for a total flow of 20 liters / hour. This valve can be remotely controlled and delivers in the interstitial circuit between the two rings. - a valve for regulating the gas discharge pressure to the atmosphere of the furnace.
  • the metal of the crown 22 is subjected to high and variable thermal stresses at the limit of the strip-roll contact.
  • the fatigue limit of this metal must be greater than 100 MPa at 400 ° C, that of the metal of the internal crown 23 must be greater than 270 MPa at 80 ° C.
  • Fig. 6 shows three characteristic cooling curves for three different gas compositions.
  • Curve A gives the temperature variation in an external wall of a quenching roll for a strip temperature Tb before quenching of 600 ° C., the gas circulating in the gap being hydrogen.
  • Ts represents the temperature on the surface of the outer ring 22, Te the temperature measured at the gap 24 and Ti the temperature of the inner surface of the ring 23.
  • Curves B and C represent, under the same measurement conditions, the temperature variations, in the external wall of a quenching roll, on the one hand, a circulation of a gas containing 25% hydrogen and 80% d nitrogen, and on the other hand a circulation of pure nitrogen.
  • the roller contact quenching device makes it possible to regulate the exit temperature of the roll quenching by acting on the heat exchange coefficient K, without modifying the temperature at the inlet, and therefore respecting a cycle. precise thermal whatever the operating conditions of the line.
EP90402542A 1989-09-14 1990-09-14 Kühlvorrichtung mit Kontaktrollen zum kontinuierlichen Abschrecken von vorgewärmtem Stahlband Withdrawn EP0418166A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8912055 1989-09-14
FR8912055A FR2651795B1 (fr) 1989-09-14 1989-09-14 Dispositif de refroidissement par contact de rouleaux pour la trempe en continu d'une bande d'acier prechauffee.

Publications (1)

Publication Number Publication Date
EP0418166A1 true EP0418166A1 (de) 1991-03-20

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EP90402542A Withdrawn EP0418166A1 (de) 1989-09-14 1990-09-14 Kühlvorrichtung mit Kontaktrollen zum kontinuierlichen Abschrecken von vorgewärmtem Stahlband

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EP (1) EP0418166A1 (de)
FR (1) FR2651795B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1486573A1 (de) * 2003-06-11 2004-12-15 Usinor Verfahren und Vorrichtung zur Kühlung eines sich bewegenden metallischen Bandes
CN102012686A (zh) * 2010-07-15 2011-04-13 秦皇岛首秦金属材料有限公司 一种利用淬火机低压段进行弱水冷的精确控制方法
US8506877B2 (en) 2008-07-29 2013-08-13 Siemens Vai Metals Technologies Sas Method and device for adjusting the cooling and energy recovery of a steel strip in an annealing or galvanization phase
EP1814678B2 (de) † 2005-03-17 2014-08-27 SMS Siemag AG Verfahren und vorrichtung zum entzundern eines metallbandes
EP3943619A4 (de) * 2019-03-29 2022-05-04 JFE Steel Corporation Abschreckvorrichtung und metallblechherstellungsverfahren

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0117083A1 (de) * 1983-02-03 1984-08-29 Nippon Steel Corporation Verfahren und Vorrichtung zum Abkühlen von Metallband in einem Durchlaufglühofen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56114562A (en) * 1980-02-13 1981-09-09 Fuji Kogyosho:Kk Composite roll for continuous casting
JPS59153844A (ja) * 1983-02-23 1984-09-01 Sumitomo Metal Ind Ltd 可変クラウン冷却ロ−ル
JPS59162230A (ja) * 1983-03-05 1984-09-13 Sumitomo Metal Ind Ltd 鋼帯の冷却方法
JPS60131927A (ja) * 1983-12-20 1985-07-13 Mitsubishi Heavy Ind Ltd 金属ストリツプの冷却量制御方法及び冷却ロ−ル

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0117083A1 (de) * 1983-02-03 1984-08-29 Nippon Steel Corporation Verfahren und Vorrichtung zum Abkühlen von Metallband in einem Durchlaufglühofen

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 5, no. 193 (M-101), 9 décembre 1981; & JP-A-56 114 562 (FUJI KOGYOSHO K.K.) 09-09-1981 *
PATENT ABSTRACTS OF JAPAN, vol. 8, no. 283 (C-258)[1720], 25 décembre 1984; & JP-A-59 153 844 (SUMITOMO KINZOKU KOGYO K.K.) 01-09-1984 *
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 12 (C-261)[1735], 18 janvier 1985; & JP-A-59 162 230 (SUMITOMO KINZOKU KOGYO K.K.) 13-09-1984 *
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 287 (C-314)[2010], 14 novembre 1985; & JP-A-60 131 927 (MITSUBISHI JUKOGYO K.K.) 13-07-1985 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1486573A1 (de) * 2003-06-11 2004-12-15 Usinor Verfahren und Vorrichtung zur Kühlung eines sich bewegenden metallischen Bandes
WO2004111280A2 (fr) * 2003-06-11 2004-12-23 Usinor Procede et installation de refroidissement d'une bande metallique en defilement
WO2004111280A3 (fr) * 2003-06-11 2005-02-17 Usinor Procede et installation de refroidissement d'une bande metallique en defilement
US7527701B2 (en) 2003-06-11 2009-05-05 Usinor Method and plant for cooling a moving metal strip
EP1814678B2 (de) † 2005-03-17 2014-08-27 SMS Siemag AG Verfahren und vorrichtung zum entzundern eines metallbandes
US8506877B2 (en) 2008-07-29 2013-08-13 Siemens Vai Metals Technologies Sas Method and device for adjusting the cooling and energy recovery of a steel strip in an annealing or galvanization phase
CN102012686A (zh) * 2010-07-15 2011-04-13 秦皇岛首秦金属材料有限公司 一种利用淬火机低压段进行弱水冷的精确控制方法
CN102012686B (zh) * 2010-07-15 2012-11-21 秦皇岛首秦金属材料有限公司 一种利用淬火机低压段进行弱水冷的精确控制方法
EP3943619A4 (de) * 2019-03-29 2022-05-04 JFE Steel Corporation Abschreckvorrichtung und metallblechherstellungsverfahren

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Publication number Publication date
FR2651795A1 (fr) 1991-03-15
FR2651795B1 (fr) 1993-10-08

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