EP1108072B1 - Verfahren und anlage zur herstellung von dualphasen-stählen - Google Patents

Verfahren und anlage zur herstellung von dualphasen-stählen Download PDF

Info

Publication number: EP1108072B1
Authority: EP; European Patent Office
Prior art keywords: cooling; ferrite; stage; dual; austenite
Prior art date: 1998-07-24
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.): Expired - Lifetime

Application number

EP99938282A

Other languages

German (de)

English (en)

French (fr)

Other versions

EP1108072A1 (de

Inventor

August Sprock

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.)

SMS Siemag AG

Original Assignee

SMS Schloemann Siemag AG

Schloemann Siemag AG

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.)

1998-07-24

Filing date

1999-07-17

Publication date

2002-09-25

1999-07-17 Application filed by SMS Schloemann Siemag AG, Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG

2001-06-20 Publication of EP1108072A1 publication Critical patent/EP1108072A1/de

2002-09-25 Application granted granted Critical

2002-09-25 Publication of EP1108072B1 publication Critical patent/EP1108072B1/de

2019-07-17 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Images

Classifications

- 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
- C21D1/02—Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation
- 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
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
- 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
- C21D2211/001—Austenite
- 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
- C21D2211/002—Bainite
- 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
- C21D2211/005—Ferrite
- 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 invention relates to a method and a plant for the production of Dual-phase steels from the hot-rolled state with one two-phase structure made of 70 to 90% ferrite and 30 to 10% martensite through a controlled temperature control and defined cooling strategy during the cooling of the steels, among other things by means of water cooling after its finish rolling, the cooling curve in. in a first cooling stage the ferrite area enters and after reaching the necessary ferrite content in a second cooling stage to temperatures below the Martensite start temperature is further cooled.
sufficient ferrite formation for. B. by cooling with Water to a temperature of around 620 - 650 ° C with subsequent air cooling reached.
the duration of the air cooling (approx. 8 seconds) is chosen so that at least 70% of the austenite is converted to ferrite before the second cooling step starts.
EP-A-0 747 495 discloses a process for producing hot-rolled steel sheet, the structure of which comprises at least 75% ferrite and at least 10% martensite.
the steel is specifically cooled after hot rolling, in a first cooling stage with a cooling rate of 2 to 15 ° C / s within a period of 8 to 40 seconds to a temperature between the Ar 1 point. and 730 ° C and then in a second cooling stage with a cooling rate of 20 to 150 ° C per second to a temperature of 300 ° C.
the first cooling stage is preceded by rapid cooling with a cooling rate of 20 to 150 ° C / s, which leads to below the temperature of the Ar 3 point.
the task is procedurally with the identifying Measures of claim 1 solved in that during the first Cooling stage the cooling curve of the steels with such a low Cooling rate from 20 K / s to 30 K / s is set that the Cooling curve with such a high temperature in the ferrite area that the ferrite formation can occur quickly and before the start of the second cooling stage already at least 70% of the austenite in ferrite are converted.
the principle of loosened up Cooling applied is a water cooling system that works by far successively arranged water cooling stages water on the refrigerated goods is applied.
the cooling can also be done with a infinitely variable amount of coolant can be realized.
the cooling can be loosened by adapting to the refrigerated goods Extend until the desired degree of conversion is reached is without the risk - as with the known methods with faster cooling - that the cooling curve is due to excessive cooling leaves the ferrite area beforehand.
An installation for carrying out the method of the invention is characterized by one behind the last finishing mill arranged cooling section from several at a distance from one another arranged water cooling levels or cooling systems with a stepless changeable amount of coolant.
the number of water cooling levels, their effective length and their distance from each other are according to the invention changeable, so that this cooling section is based on changed geometries of the Chilled goods as well as different belt speeds in easier Way can be customized.
FIG. 1 The end of a rolling mill is shown schematically in FIG. 1, consisting of the last finishing mill (1), the rolling stock or the cooling stock (2) and a reel (3) with deflection rollers or drivers (4). Above This part of a rolling mill has two different cooling sections located. With the cooling section (5) according to the prior art early, rapid through a continuous supply of water Cooling of the refrigerated goods (2) brought about. In the cooling section (6) According to the invention, water cooling stages (7) one behind the other arranged, whereby the cooling is "loosened".
FIG. 2 shows the course in a time-temperature conversion diagram the cooling curve (9) in a cooling according to known methods and the Cooling curve (10) shown with a loosened cooling, with on the abscissa is the time (Z) in seconds and the ordinate is the temperature (T) are given in ° Celsius.
the cooling curve (9) shows the cooling process for the strategy commonly used today (early, quick cooling to a certain holding temperature with subsequent air cooling, then further cooling to low temperatures below the martensite starting temperature).
the cooling curve (10) reaches its first cooling stage (14) in the loosened cooling compared to the cooling curve (9) Ferrite area (F) at point (15) only later. Since after reaching the The loosened cooling is initially maintained, no time-consuming holding time with air cooling is required and the Cooling curve (10) leaves the ferrite area (F) earlier again.
the loosened cooling is within the ferrite area (F) maintained until the desired degree of conversion is reached is. Then the further cooling takes place immediately with the second one Cooling stage (16).
the invention is not based on those described in the illustrations exemplary cooling curves, but also others Cooling curves such as for cooling systems with a stepless changeable amount of coolant, which is higher in the sense of the invention Transition temperatures are possible.
the invention is also not limited to water cooling, but others can Cooling systems are used that reach the early stage Lead ferrite area at high temperatures.

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Chemical & Material Sciences (AREA)
Engineering & Computer Science (AREA)
Organic Chemistry (AREA)
Crystallography & Structural Chemistry (AREA)
Mechanical Engineering (AREA)
Materials Engineering (AREA)
Metallurgy (AREA)
Physics & Mathematics (AREA)
Thermal Sciences (AREA)
Heat Treatment Of Strip Materials And Filament Materials (AREA)
Metal Rolling (AREA)
Heat Treatment Of Sheet Steel (AREA)
Heat Treatment Of Steel (AREA)
Heat Treatments In General, Especially Conveying And Cooling (AREA)
Heat Treatment Of Articles (AREA)
Control Of Heat Treatment Processes (AREA)

EP99938282A 1998-07-24 1999-07-17 Verfahren und anlage zur herstellung von dualphasen-stählen Expired - Lifetime EP1108072B1 (de)

Applications Claiming Priority (3)

Application Number	Priority Date	Filing Date	Title
DE19833321		1998-07-24
DE19833321A DE19833321A1 (de)	1998-07-24	1998-07-24	Verfahren und Anlage zur Herstellung von Dualphasen-Stählen
PCT/EP1999/005113 WO2000005422A1 (de)	1998-07-24	1999-07-17	Verfahren und anlage zur herstellung von dualphasen-stählen

Publications (2)

Publication Number	Publication Date
EP1108072A1 EP1108072A1 (de)	2001-06-20
EP1108072B1 true EP1108072B1 (de)	2002-09-25

Family

ID=7875154

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP99938282A Expired - Lifetime EP1108072B1 (de)	1998-07-24	1999-07-17	Verfahren und anlage zur herstellung von dualphasen-stählen

Country Status (11)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE10327383A1 (de) *	2003-06-18	2005-02-10	Sms Demag Ag	Verfahren und Anlage zur Herstellung von Warmband mit Dualphasengefüge

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
BE1013359A3 (fr)	2000-03-22	2001-12-04	Centre Rech Metallurgique	Procede pour la fabrication d'une bande en acier multiphase laminee a chaud.
NL1016042C2 (nl) *	2000-08-29	2001-07-24	Corus Technology B V	Warmgewalste stalen band, werkwijze voor het vervaardigen ervan, en een daarmee vervaardigde wielschijf.
AUPR048000A0 (en) *	2000-09-29	2000-10-26	Bhp Steel (Jla) Pty Limited	A method of producing steel
KR100516519B1 (ko) *	2001-12-26	2005-09-26	주식회사 포스코	제어압연 및 급속냉각 방식에 의한 2상조직 탄소강 선재및 봉강 제조방법
KR100521596B1 (ko) *	2002-11-20	2005-10-12	현대자동차주식회사	직접통전가열에 의한 자동차부품 제조 방법
CN104001742A (zh) *	2014-05-21	2014-08-27	中冶南方工程技术有限公司	一种对棒材精轧机组之间及机组后的轧件实现控制冷却的方法
CN104384207A (zh) *	2014-10-22	2015-03-04	南京钢铁股份有限公司	一种热轧轴承钢棒材的控制冷却方法及其工艺布置
KR102440768B1 (ko) *	2020-12-18	2022-09-08	주식회사 포스코	후강판 제조 장치 및 방법

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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
JPS57137426A (en) *	1981-02-20	1982-08-25	Kawasaki Steel Corp	Production of low yield ratio, high tensile hot rolled steel plate by mixed structure
JPS57137452A (en) *	1981-02-20	1982-08-25	Kawasaki Steel Corp	Hot rolled high tensile steel plate having composite structure and its manufacture
JPS61170518A (ja) *	1985-01-25	1986-08-01	Kobe Steel Ltd	成形性にすぐれた高強度熱延鋼板の製造方法
JPS6293006A (ja) *	1985-10-18	1987-04-28	Kobe Steel Ltd	高強度熱延鋼板の製造法
JP3039842B2 (ja) *	1994-12-26	2000-05-08	川崎製鉄株式会社	耐衝撃性に優れる自動車用熱延鋼板および冷延鋼板ならびにそれらの製造方法
FR2735148B1 (fr) *	1995-06-08	1997-07-11	Lorraine Laminage	Tole d'acier laminee a chaud a haute resistance et haute emboutissabilite renfermant du niobium, et ses procedes de fabrication.
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1998
- 1998-07-24 DE DE19833321A patent/DE19833321A1/de not_active Withdrawn
1999
- 1999-07-07 MY MYPI99002855A patent/MY124339A/en unknown
- 1999-07-17 CN CNB998091405A patent/CN1173048C/zh not_active Expired - Lifetime
- 1999-07-17 WO PCT/EP1999/005113 patent/WO2000005422A1/de active IP Right Grant
- 1999-07-17 JP JP2000561368A patent/JP2002521562A/ja active Pending
- 1999-07-17 CA CA2338743A patent/CA2338743C/en not_active Expired - Lifetime
- 1999-07-17 RU RU2001105194/02A patent/RU2225453C2/ru active
- 1999-07-17 KR KR1020017000810A patent/KR100578823B1/ko active IP Right Grant
- 1999-07-17 DE DE59902877T patent/DE59902877D1/de not_active Expired - Lifetime
- 1999-07-17 EP EP99938282A patent/EP1108072B1/de not_active Expired - Lifetime
- 1999-07-17 BR BR9912310-0A patent/BR9912310A/pt not_active IP Right Cessation
- 1999-07-17 AT AT99938282T patent/ATE224959T1/de not_active IP Right Cessation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE10327383A1 (de) *	2003-06-18	2005-02-10	Sms Demag Ag	Verfahren und Anlage zur Herstellung von Warmband mit Dualphasengefüge
DE10327383B4 (de) *	2003-06-18	2010-10-14	Aceria Compacta De Bizkaia S.A., Sestao	Verfahren und Anlage zur Herstellung von Warmband mit Dualphasengefüge
DE10327383C5 (de) *	2003-06-18	2013-10-17	Aceria Compacta De Bizkaia S.A.	Anlage zur Herstellung von Warmband mit Dualphasengefüge

Also Published As

Publication number	Publication date
CN1173048C (zh)	2004-10-27
JP2002521562A (ja)	2002-07-16
CA2338743A1 (en)	2000-02-03
RU2225453C2 (ru)	2004-03-10
CA2338743C (en)	2010-03-30
KR20010071978A (ko)	2001-07-31
MY124339A (en)	2006-06-30
BR9912310A (pt)	2004-08-31
ATE224959T1 (de)	2002-10-15
KR100578823B1 (ko)	2006-05-11
WO2000005422A1 (de)	2000-02-03
DE59902877D1 (de)	2002-10-31
EP1108072A1 (de)	2001-06-20
CN1311826A (zh)	2001-09-05
DE19833321A1 (de)	2000-01-27

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