EP3395964A1 - Procédé et dispositif de fabrication de tôle d'acier contenant de la martensite - Google Patents

Procédé et dispositif de fabrication de tôle d'acier contenant de la martensite Download PDF

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Publication number
EP3395964A1
EP3395964A1 EP16879266.1A EP16879266A EP3395964A1 EP 3395964 A1 EP3395964 A1 EP 3395964A1 EP 16879266 A EP16879266 A EP 16879266A EP 3395964 A1 EP3395964 A1 EP 3395964A1
Authority
EP
European Patent Office
Prior art keywords
steel sheet
cooling
martensite
coil
water
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Withdrawn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
EP16879266.1A
Other languages
German (de)
English (en)
Other versions
EP3395964A4 (fr
Inventor
In-Suk Han
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.)
Posco Holdings Inc
Original Assignee
Posco Co Ltd
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 Posco Co Ltd filed Critical Posco Co Ltd
Publication of EP3395964A1 publication Critical patent/EP3395964A1/fr
Publication of EP3395964A4 publication Critical patent/EP3395964A4/fr
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/185—Hardening; Quenching with or without subsequent tempering from an intercritical temperature
    • 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
    • C21D1/60—Aqueous agents
    • 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
    • C21D1/63—Quenching devices for bath 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • 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
    • C21D9/0043—Muffle furnaces; Retort furnaces
    • 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
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • 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
    • 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
    • C21D9/68—Furnace coilers; Hot coilers
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

Definitions

  • the present disclosure relates to a method and a device for manufacturing a martensite-containing steel sheet used for automobile structural steel, and more particularly, to a method and a device for manufacturing a martensite-containing steel sheet via batchwise heating and continuous cooling.
  • alloying elements such as nonferrous metals, rare earth elements or the like may be added to steel to produce high strength steel.
  • the quenching cooling method may generally be a method in which a steel sheet is cooled at a cooling rate of, for example, 1000°C/second in the case of a 1 mm steel sheet.
  • a quenching cooling bath storing cooling water may be used.
  • the cooling bath may include a cooler for maintaining cooling water at a constant temperature and a jet injector for increasing a cooling rate. As such, a steel strip passes through a cooling bath, a quenching device, to obtain a desired degree of cooling.
  • a steel sheet in a heating zone, may be heated to a temperature of 800°C or higher, and when the steel sheet is quenched, the steel sheet may be rapidly cooled to room temperature in one second.
  • a relatively high temperature difference may occur in longitudinal and width directions, and high thermal stress may occur, thereby causing deformation of the steel sheet.
  • the continuous type process may be advantageous for mass production, and the batch type process may be advantageous for small-scale production, as compared with that of the continuous type.
  • An aspect of the present disclosure is to provide a method of manufacturing a martensite-containing steel sheet in which shape transformation is reduced via heating in a batch manner and via continuous cooling, economically.
  • Another aspect of the present disclosure is to provide a device for manufacturing a martensite-containing steel sheet in which shape transformation is reduced via heating in a batch manner and via continuous cooling, economically.
  • a method of manufacturing a martensite-containing steel sheet includes preparing, in coil form, a steel sheet in which at least a portion of austenite is transformed into martensite during water cooling; heating the steel sheet having the coil form such that at least a portion of a microstructure of the steel sheet becomes austenite; and unwinding the heated steel sheet having the coil form, and water-cooling the steel sheet at a cooling rate of 500°C/sec or more while transferring the steel sheet at a transferring speed of 300 mpm or more, to transform the at least a portion of the austenite into the martensite.
  • a water-cooling termination temperature during the water cooling may be 150 °C or higher, a temperature equal to or lower than a martensitic transformation start temperature (Ms).
  • Ms martensitic transformation start temperature
  • a device for manufacturing a martensite-containing steel sheet includes a heating furnace heating a steel sheet in the form of a coil; a pay-off reel unwinding a heated coil; a cooling device cooling a heated steel sheet transferred by being unwound from the coil; and a coiler winding a cooled steel sheet.
  • the cooling device may be configured to provide a cooling rate of 500°C/sec or more when cooling the steel sheet.
  • the cooling device may include a cooling bath in which a cooling liquid cooling the heated steel sheet is stored, and a cooling member configured to jet the cooling liquid toward a steel strip.
  • a guide roller is provided to guide the steel sheet.
  • facility costs may be significantly reduced by satisfying a cooling rate required for manufacturing martensite steel while reducing the size of equipment. Further, by separating heating and cooling, a transfer speed of a steel strip may increase in a cooling process, such that a change in a longitudinal temperature gradient of the steel strip may be significantly decreased even at a high cooling rate of 500 °C/sec or more, thereby decreasing thermal stress to significantly reduce shape deformation of the steel strip.
  • FIG. 1 is a schematic view illustrating an example of a device for manufacturing a martensite-containing steel sheet according to an exemplary embodiment in the present disclosure.
  • a method and a device for manufacturing a martensite-containing steel sheet are provided, which are effective in terms of facility investment and operation, and in which shape deformation of a steel strip may also be significantly reduced by dispersing and significantly decreasing concentration of thermal stress in a longitudinal direction of a steel sheet during rapid cooling of the steel sheet.
  • a steel sheet in which at least a portion of austenite is transformed into martensite during water cooling, is prepared in the form of a coil, to produce a martensite-containing steel sheet.
  • a steel sheet obtained as at least a portion of a microstructure becomes austenite during heating and at least a portion of the austenite is transformed into martensite during water cooling may be used, and is not limited thereto.
  • a martensitic steel sheet As the steel sheet which may be appropriately used in the present disclosure, a martensitic steel sheet, a dual-phase steel sheet, a complex-phase steel sheet or the like may be used.
  • a steel sheet including 0.05 to 0.4 wt% of carbon, 2 wt% or less of silicon, 3 wt% or less (including 0%) of manganese, 0.05 wt% or less of phosphorus, 0.02 wt% or less of sulfur, and Fe and impurities as a remainder thereof, may be used.
  • the steel sheet is not particularly limited, and may be, for example, a hot-rolled steel sheet or a cold-rolled steel sheet.
  • the steel sheet coil prepared as described above may be heated such that at least a portion of the microstructure of the steel sheet becomes austenite.
  • Heating conditions of the steel sheet may be appropriately controlled depending on a steel sheet to be produced.
  • heating may be performed in such a manner that the entirety of the microstructure of the steel sheet may become austenite, to transform the entirety of the microstructure into martensite.
  • a heating temperature may be 700 to 900°C
  • a heating atmosphere may be a reducing atmosphere.
  • the reducing atmosphere may be an atmosphere of 90 to 98% by volume of nitrogen and 2 to 10% by volume of hydrogen.
  • a heating method is not particularly limited.
  • examples of the heating method may include methods using a radiant tube provided as a radiant heating furnace or a muffle-type heating furnace.
  • the heating time may be 20 to 80 hours, for example, when a coil width is within a range of 600 to 1400 mm.
  • the steel sheet coil heated as described above may be unwound and may be water-cooled at a cooling rate of 500°C/sec or more while being transferred at a transfer speed of 300 mpm or more, to transform at least a portion of the austenite into martensite, thereby manufacturing a martensite-containing steel sheet.
  • the steel sheet has a transfer speed of less than 300 mpm, there may be a problem in which a temperature gradient and a decrease in thermal stress are insufficient as compared with those in a continuous annealing method of the related art, and the effect of improving the shape is relatively low.
  • the transfer speed of the steel sheet may further be increased.
  • an upper limit thereof may be limited to 800 mpm.
  • the transfer speed of the steel sheet may be within 400 to 600 mpm.
  • the cooling rate of the steel sheet is less than 500°C/sec, a cooling deviation may increase in a film boiling region and a shape of the steel sheet may thus deteriorate.
  • the cooling rate of the steel sheet may be 500 to 1500°C/sec. In further detail, the cooling rate of the steel sheet may be 800 to 1200°C/sec.
  • a water-cooling termination temperature is not particularly limited as long as it is equal to or lower than a martensitic transformation start temperature (Ms), and may be, for example, room temperature.
  • Ms martensitic transformation start temperature
  • the water-cooling termination temperature may be 150°C or more, a Ms (martensitic transformation start temperature) or lower.
  • self-tempering may be performed to improve an elongation rate without further tempering, and to evaporate remaining water on a surface of a steel strip, thereby preventing formation of scale.
  • a device 100 for manufacturing a martensite-containing steel sheet may include a heating furnace 1 heating a steel sheet in the form of a coil 10; a pay-off reel 2 unwinding the heated coil 10; a cooling device 3 cooling a heated steel sheet unwound from the coil to be transferred therefrom; and a coiler 4 winding the cooled steel sheet.
  • the cooling device 3 may include a cooling bath 31 in which a cooling liquid is stored to cool the heated steel sheet, and a cooling member 32 provided to jet the cooling liquid toward the steel strip.
  • the cooling device 3 may be configured to provide a cooling rate of 500°C/sec or more when cooling the steel sheet.
  • the device for manufacturing a martensite-containing steel sheet may include guide rollers 5a and 5b guiding the steel sheet and disposed between the pay-off reel 2 and the cooling device 3 and between the cooling device 3 and the coiler 4, respectively.
  • reference numeral 6 denotes a transfer truck
  • reference numeral 11 denotes a heating furnace door
  • reference numeral 33 denotes a cooling tub roller.
  • a method of manufacturing a martensite-containing steel sheet using the device 100 for manufacturing a martensite-containing steel sheet of FIG. 1 will be described.
  • the coil 10 for a steel sheet, to be heated may be located on a transfer truck 6 using a crane or the like.
  • the transfer truck 6 carrying the coil may move to the heating furnace 1.
  • the transfer truck 6 may emerge from the heating furnace 1.
  • the steel sheet may be connected to the guide roller 5a, the cooling tub roller 33, the guide roller 5b and the coiler 4.
  • a steel sheet of the coil 10 newly-inserted into the pay-off reel 2 may be welded to be connected to the already connected steel sheet.
  • the heating furnace door 11 may be closed, to heat the coil 10.
  • a heating temperature may be 700 to 900°C, and the interior of the heating furnace may have 90 to 98% by volume of nitrogen and 2 to 10% by volume of hydrogen in a reducing atmosphere.
  • the heating furnace 1 is not particularly limited, and for example, a radiant tube provided as a radiant heating furnace, a muffle-type heating furnace, or the like may be used.
  • a heating period of time may be 20 to 80 hours when a coil width is 600 to 1400 mm.
  • the pay-off reel 2 and the coiler 4 may be operated, such that the steel sheet passes through the cooling bath 31 of the cooling device 3.
  • the cooling bath 31 may be filled with water as a refrigerant for cooling.
  • the cooling member 32 may be provided in the cooling bath, to spray a coolant on front and rear surfaces of the steel strip, to cool the steel sheet at a rate of 500°C/sec or more.
  • the transfer speed of the steel sheet during cooling may be 300mpm or more, 1.5 times faster than 200 mpm, a transfer speed in a normal continuous annealing process, and in detail, may be 400 to 600 mpm, 2 to 3 times faster than 200 mpm.
  • a temperature gradient of a steel strip is 300°C/meter in quenching, rapid cooling, but according to an exemplary embodiment in the present disclosure, a temperature gradient of a steel strip may decrease to 150 to 100°C/meter, and thus, thermal stress may also decrease. Numerical results indicate that the thermal stress decreases to one-third (1/3) when the speed is doubled. Thus, even in the case in which the cooling rate is the same as a cooling rate of 1000°C/sec in a general continuous annealing quenching process, the shape of the steel sheet may be good. On the other hand, since the transfer speed of the steel strip is relatively fast during cooling, time taken to cool the entirety of a coil may be as short as about 4 minutes.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
EP16879266.1A 2015-12-21 2016-12-16 Procédé et dispositif de fabrication de tôle d'acier contenant de la martensite Withdrawn EP3395964A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020150183266A KR20170089045A (ko) 2015-12-21 2015-12-21 마르텐사이트 함유 강판의 제조방법 및 장치
PCT/KR2016/014817 WO2017111399A1 (fr) 2015-12-21 2016-12-16 Procédé et dispositif de fabrication de tôle d'acier contenant de la martensite

Publications (2)

Publication Number Publication Date
EP3395964A1 true EP3395964A1 (fr) 2018-10-31
EP3395964A4 EP3395964A4 (fr) 2018-12-26

Family

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EP16879266.1A Withdrawn EP3395964A4 (fr) 2015-12-21 2016-12-16 Procédé et dispositif de fabrication de tôle d'acier contenant de la martensite

Country Status (5)

Country Link
EP (1) EP3395964A4 (fr)
JP (1) JP2019505667A (fr)
KR (1) KR20170089045A (fr)
CN (1) CN108431249A (fr)
WO (1) WO2017111399A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021201912A1 (fr) * 2020-04-03 2021-10-07 Novelis Inc. Débobinage à chaud de métal
CN113528932A (zh) * 2021-05-31 2021-10-22 唐山钢铁集团高强汽车板有限公司 一种马氏体钢板及其制备方法

Family Cites Families (14)

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JPS5944367B2 (ja) * 1978-06-15 1984-10-29 日本鋼管株式会社 水焼入連続焼鈍法
US4415382A (en) * 1981-10-13 1983-11-15 Inland Steel Company Continuous annealing apparatus and method
JPS6184321A (ja) * 1984-09-29 1986-04-28 Trinity Ind Corp 焼入装置
ATE179640T1 (de) * 1994-10-20 1999-05-15 Mannesmann Ag Verfahren und vorrichtung zur herstellung von stahlband mit kaltwalzeigenschaften
JPH11193418A (ja) * 1997-12-29 1999-07-21 Kobe Steel Ltd 平坦性に優れた高強度冷延鋼板の製造方法
US20020104597A1 (en) * 1999-07-09 2002-08-08 Ipsco Enterprises Inc. Method and apparatus for producing steel
JP2002275545A (ja) * 2001-03-15 2002-09-25 Kawasaki Steel Corp 連続焼鈍設備
KR20030054974A (ko) * 2001-12-26 2003-07-02 주식회사 포스코 열연코일 냉각방법
JP2003277833A (ja) * 2002-03-22 2003-10-02 Jfe Steel Kk 金属板の製造方法および製造装置
JP2010222631A (ja) * 2009-03-23 2010-10-07 Kobe Steel Ltd 鋼板連続焼鈍設備および鋼板連続焼鈍設備の運転方法
KR101376565B1 (ko) * 2011-12-15 2014-04-02 (주)포스코 연속 소둔라인 급냉대의 스트립 온도제어 방법 및 장치
DE102011056847B4 (de) * 2011-12-22 2014-04-10 Thyssenkrupp Rasselstein Gmbh Stahlblech zur Verwendung als Verpackungsstahl sowie Verfahren zur Herstellung eines Verpackungsstahls
KR101451814B1 (ko) * 2012-12-20 2014-10-16 주식회사 포스코 강판 열처리용 급냉 장치
JP6086089B2 (ja) * 2014-03-27 2017-03-01 Ｊｆｅスチール株式会社 鋼板の冷却方法

Also Published As

Publication number Publication date
JP2019505667A (ja) 2019-02-28
CN108431249A (zh) 2018-08-21
EP3395964A4 (fr) 2018-12-26
KR20170089045A (ko) 2017-08-03
WO2017111399A1 (fr) 2017-06-29

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