RU2001105194A - METHOD FOR PRODUCING TWO-PHASE STEELS AND INSTALLATION FOR ITS IMPLEMENTATION - Google Patents

METHOD FOR PRODUCING TWO-PHASE STEELS AND INSTALLATION FOR ITS IMPLEMENTATION

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Publication number
RU2001105194A
RU2001105194A RU2001105194/02A RU2001105194A RU2001105194A RU 2001105194 A RU2001105194 A RU 2001105194A RU 2001105194/02 A RU2001105194/02 A RU 2001105194/02A RU 2001105194 A RU2001105194 A RU 2001105194A RU 2001105194 A RU2001105194 A RU 2001105194A
Authority
RU
Russia
Prior art keywords
cooling
ferrite
stage
water
steels
Prior art date
Application number
RU2001105194/02A
Other languages
Russian (ru)
Other versions
RU2225453C2 (en
Inventor
Аугуст Шпрок
Original Assignee
Смс Шлеманн-Зимаг Акциенгезелльшафт
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
Priority claimed from DE19833321A external-priority patent/DE19833321A1/en
Application filed by Смс Шлеманн-Зимаг Акциенгезелльшафт filed Critical Смс Шлеманн-Зимаг Акциенгезелльшафт
Publication of RU2001105194A publication Critical patent/RU2001105194A/en
Application granted granted Critical
Publication of RU2225453C2 publication Critical patent/RU2225453C2/en

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Claims (4)

1. Способ получения двухфазных сталей из горячекатаного состояния с двухфазной структурой, содержащей 70-90% феррита и 30-10% мартенсита, путем контролируемого управления температурой и определенной стратегии охлаждения сталей, в том числе посредством охлаждения водой после их окончательной прокатки, причем на первой ступени охлаждения со скоростью охлаждения <30oС/с кривая охлаждения попадает в область феррита, а по достижении необходимой доли феррита на второй ступени охлаждение осуществляют со скоростью охлаждения >30oС/с до температур ниже начальной температуры образования мартенсита, отличающийся тем, что первую ступень (14) охлаждения на участке охлаждения из последовательно расположенных друг за другом ступеней (7) охлаждения водой или в системе охлаждения с бесступенчато изменяемым количеством охлаждающего средства осуществляют со скоростью охлаждения 30oС/с так, что кривая (10) охлаждения попадает в область феррита еще с такой высокой температурой, что образование феррита может происходить быстро, и до начала второй ступени (16) охлаждения, которая без промежуточного охлаждения воздухом и времени выдержки следует непосредственно за первой ступенью (14) охлаждения, уже, по меньшей мере, 70% аустенита превращается в феррит.1. A method of producing biphasic steels from a hot-rolled state with a two-phase structure containing 70-90% ferrite and 30-10% martensite, by controlled temperature control and a specific strategy for cooling the steels, including by cooling with water after their final rolling, and the first cooling stage at a cooling rate of <30 o C / s cooling curve lies in a region of ferrite, and on reaching the required proportion of ferrite to the second stage of cooling is performed at a cooling rate of> 30 o C / sec to temperatures n the initial temperature of martensite formation, characterized in that the first stage (14) cooling in the cooling section of serially arranged one behind the other stages (7), cooling water or a cooling system with a continuously variable amount of the coolant is performed at a cooling rate of 30 o C / sec so that the cooling curve (10) enters the ferrite region with such a high temperature that ferrite formation can occur quickly, and before the second cooling stage (16) begins, which is without intermediate air cooling and holding time immediately follows the first stage (14) of cooling, at least 70% of austenite is already converted to ferrite. 2. Способ по п. 1, отличающийся тем, что во время превращения аустенита в феррит вплоть до нужного содержания феррита, равного по меньшей мере, 70%, продолжают охлаждение на первой ступени. 2. The method according to p. 1, characterized in that during the conversion of austenite to ferrite up to the desired ferrite content of at least 70%, cooling is continued in the first stage. 3. Установка для получения двухфазных сталей из горячекатаного состояния, отличающаяся тем, что за последней чистовой прокатной клетью (1) расположен участок (6) охлаждения из нескольких расположенных друг за другом ступеней (7) охлаждения водой или систем охлаждения с бесступенчато изменяемым количеством охлаждающего средства. 3. Installation for producing biphasic steels from a hot-rolled state, characterized in that behind the last finishing mill stand (1) there is a cooling section (6) from several successive stages (7) of water cooling or cooling systems with an infinitely variable amount of coolant . 4. Установка по п. 3, отличающаяся тем, что она выполнена с возможностью изменения числа ступеней (7) охлаждения водой, их эффективной длины и расстояния друг от друга или с возможностью бесступенчатой перестановки при регулировании количества. 4. Installation according to claim 3, characterized in that it is made with the possibility of changing the number of steps (7) of water cooling, their effective length and distance from each other, or with the possibility of stepless permutation when controlling the quantity.
RU2001105194/02A 1998-07-24 1999-07-17 Method for producing double-phase steels and plant for performing the same RU2225453C2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833321.8 1998-07-24
DE19833321A DE19833321A1 (en) 1998-07-24 1998-07-24 Method and installation to produce dual phase steels out of hot-rolled strip, with cooling rate at first cooling stage set sufficiently low to obtain temperature which is sufficiently high for rapid transformation of austenite into ferrite

Publications (2)

Publication Number Publication Date
RU2001105194A true RU2001105194A (en) 2003-01-27
RU2225453C2 RU2225453C2 (en) 2004-03-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
RU2001105194/02A RU2225453C2 (en) 1998-07-24 1999-07-17 Method for producing double-phase steels and plant for performing the same

Country Status (11)

Country Link
EP (1) EP1108072B1 (en)
JP (1) JP2002521562A (en)
KR (1) KR100578823B1 (en)
CN (1) CN1173048C (en)
AT (1) ATE224959T1 (en)
BR (1) BR9912310A (en)
CA (1) CA2338743C (en)
DE (2) DE19833321A1 (en)
MY (1) MY124339A (en)
RU (1) RU2225453C2 (en)
WO (1) WO2000005422A1 (en)

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BE1013359A3 (en) 2000-03-22 2001-12-04 Centre Rech Metallurgique Method for manufacturing a multi-band steel hot rolled.
NL1016042C2 (en) * 2000-08-29 2001-07-24 Corus Technology B V Hot rolled dual phase steel band for, e.g., automotive parts contains vanadium in place of chromium
AUPR048000A0 (en) * 2000-09-29 2000-10-26 Bhp Steel (Jla) Pty Limited A method of producing steel
KR100516519B1 (en) * 2001-12-26 2005-09-26 주식회사 포스코 A method for manufacturing the dual phase carbon steel wire by using controlled rolling and rapid cooling
KR100521596B1 (en) * 2002-11-20 2005-10-12 현대자동차주식회사 Processing method of automotive parts by direct resistance heating
DE10327383C5 (en) * 2003-06-18 2013-10-17 Aceria Compacta De Bizkaia S.A. Plant for the production of hot strip with dual phase structure
CN104001742A (en) * 2014-05-21 2014-08-27 中冶南方工程技术有限公司 Method for achieving controlled cooling on rolled pieces between and after bar finishing mill units
CN104384207A (en) * 2014-10-22 2015-03-04 南京钢铁股份有限公司 Cooling control method for hot rolling bearing steel bar and process arrangement of hot rolling bearing steel bar
KR102440768B1 (en) * 2020-12-18 2022-09-08 주식회사 포스코 Method and apparatus for manufacturng thick-sheet iron

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JPS5818970B2 (en) * 1978-08-31 1983-04-15 川崎製鉄株式会社 Method for manufacturing high-strength thin steel sheets with excellent cold workability
US4388122A (en) * 1980-08-11 1983-06-14 Kabushiki Kaisha Kobe Seiko Sho Method of making high strength hot rolled steel sheet having excellent flash butt weldability, fatigue characteristic and formability
JPS57104650A (en) * 1980-12-19 1982-06-29 Kobe Steel Ltd High-strength hot-rolled steel plate and its manufacture
JPS57137452A (en) * 1981-02-20 1982-08-25 Kawasaki Steel Corp Hot rolled high tensile steel plate having composite structure and its manufacture
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JPS61170518A (en) * 1985-01-25 1986-08-01 Kobe Steel Ltd Production of high-strength hot rolled steel sheet having excellent formability
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