CA2338743A1 - Method and installation for producing dual-phase steel - Google Patents
Method and installation for producing dual-phase steel Download PDFInfo
- Publication number
- CA2338743A1 CA2338743A1 CA002338743A CA2338743A CA2338743A1 CA 2338743 A1 CA2338743 A1 CA 2338743A1 CA 002338743 A CA002338743 A CA 002338743A CA 2338743 A CA2338743 A CA 2338743A CA 2338743 A1 CA2338743 A1 CA 2338743A1
- Authority
- CA
- Canada
- Prior art keywords
- cooling
- ferrite
- stage
- stages
- spacing
- 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
Links
- 238000000034 method Methods 0.000 title claims 3
- 229910000885 Dual-phase steel Inorganic materials 0.000 title abstract 2
- 238000009434 installation Methods 0.000 title 1
- 238000001816 cooling Methods 0.000 claims abstract 29
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract 4
- 239000010959 steel Substances 0.000 claims abstract 4
- 229910000734 martensite Inorganic materials 0.000 claims abstract 3
- 238000004519 manufacturing process Methods 0.000 claims abstract 2
- 238000005096 rolling process Methods 0.000 claims abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 4
- 229910001566 austenite Inorganic materials 0.000 claims 2
- 239000002826 coolant Substances 0.000 claims 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 230000009466 transformation Effects 0.000 claims 1
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
Landscapes
- 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)
Abstract
The invention relates to the production of dual-phase steel (2) which is obtained by targeted cooling after the final deformation step in a rolling stand (1), whereby a dual-phase structure of between 70 and 90 % ferrite and between 30 and 10 % martensite is adjusted. So as to be independent of steel geometry and strip speed the invention provides for cooling to take the form of fluidized-bed cooling carried out in a cooling line (6) comprising water- cooling stages (7) arranged one behind the other.
Claims (4)
1. Method for producing dual-phase steels from the hot-rolled state with a two-phase microstructure of 70 to 90 % ferrite and 30 to 10 % martensite by a controlled temperature guiding and defined cooling strategy during the cooling of the steels, inter alia by means of water cooling after their finish rolling, wherein in a first cooling stage at a cooling rate of < 30 K/s the cooling curve enters the ferrite region and, after reaching the required ferrite contents, further cooling is carried out in a second cooling stage at a cooling rate of > 30 K/s to temperatures below the martensite starting temperature, characterized in that a) the first cooling stage (14) is carried out in a cooling stretch of water cooling stages (7), arranged successively at a spacing, or in a cooling system with continuously changeable cooling medium quantity with a cooling rate of 30 K/s adjusted such b) that the cooling curve (10) enters the ferrite region a temperature still so high that the ferrite formation can take place quickly; and, c) before begin of the second cooling stage (16), which follows without intermediate air cooling and holding time directly after the first cooling stage (14), already at least 70 % of the austenite is transformed to ferrite.
2. Method according to claim 1, characterized in that the cooling of the first cooling stage is continued during the transformation of the austenite into ferrite up to the desired ferrite contents of at least 70 %.
3. Device for performing the method according to one or several of the preceding claims, for producing dual-phase steels from the hot-rolled state, characterized by a cooling stretch (6) arranged behind the last finish roll stand (1) and having several water cooling stages (7) positioned successively at a spacing or having cooling systems with a continuously adjustable cooling medium quantity.
4. Device according to claim 3, characterized in that the number of water cooling stages (7), their effective length, and their spacing from one another are changeable or continuously adjustable in the case of quantity control.
Applications Claiming Priority (3)
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 |
PCT/EP1999/005113 WO2000005422A1 (en) | 1998-07-24 | 1999-07-17 | Method and installation for producing dual-phase steel |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2338743A1 true CA2338743A1 (en) | 2000-02-03 |
CA2338743C CA2338743C (en) | 2010-03-30 |
Family
ID=7875154
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA2338743A Expired - Lifetime CA2338743C (en) | 1998-07-24 | 1999-07-17 | Method and installation for producing dual-phase steel |
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) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
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 |
JPS61170518A (en) * | 1985-01-25 | 1986-08-01 | Kobe Steel Ltd | Production of high-strength hot rolled steel sheet having excellent formability |
JPS6293006A (en) * | 1985-10-18 | 1987-04-28 | Kobe Steel Ltd | Production of high strength hot rolled steel sheet |
JP3039842B2 (en) * | 1994-12-26 | 2000-05-08 | 川崎製鉄株式会社 | Hot-rolled and cold-rolled steel sheets for automobiles having excellent impact resistance and methods for producing them |
FR2735148B1 (en) * | 1995-06-08 | 1997-07-11 | Lorraine Laminage | HIGH-STRENGTH, HIGH-STRENGTH HOT-ROLLED STEEL SHEET CONTAINING NIOBIUM, AND METHODS OF MAKING SAME. |
KR100301994B1 (en) * | 1996-12-24 | 2001-11-22 | 이구택 | Method for uniformly cooling hot rolled wire rod |
KR100747495B1 (en) * | 2006-11-10 | 2007-08-08 | 삼성전자주식회사 | Variable capacity rotary compressor |
-
1998
- 1998-07-24 DE DE19833321A patent/DE19833321A1/en not_active Withdrawn
-
1999
- 1999-07-07 MY MYPI99002855A patent/MY124339A/en unknown
- 1999-07-17 EP EP99938282A patent/EP1108072B1/en not_active Expired - Lifetime
- 1999-07-17 AT AT99938282T patent/ATE224959T1/en not_active IP Right Cessation
- 1999-07-17 DE DE59902877T patent/DE59902877D1/en not_active Expired - Lifetime
- 1999-07-17 WO PCT/EP1999/005113 patent/WO2000005422A1/en active IP Right Grant
- 1999-07-17 CA CA2338743A patent/CA2338743C/en not_active Expired - Lifetime
- 1999-07-17 BR BR9912310-0A patent/BR9912310A/en not_active IP Right Cessation
- 1999-07-17 RU RU2001105194/02A patent/RU2225453C2/en active
- 1999-07-17 CN CNB998091405A patent/CN1173048C/en not_active Expired - Lifetime
- 1999-07-17 KR KR1020017000810A patent/KR100578823B1/en active IP Right Grant
- 1999-07-17 JP JP2000561368A patent/JP2002521562A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
ATE224959T1 (en) | 2002-10-15 |
BR9912310A (en) | 2004-08-31 |
JP2002521562A (en) | 2002-07-16 |
RU2225453C2 (en) | 2004-03-10 |
EP1108072B1 (en) | 2002-09-25 |
CN1311826A (en) | 2001-09-05 |
DE19833321A1 (en) | 2000-01-27 |
WO2000005422A1 (en) | 2000-02-03 |
MY124339A (en) | 2006-06-30 |
KR100578823B1 (en) | 2006-05-11 |
CA2338743C (en) | 2010-03-30 |
CN1173048C (en) | 2004-10-27 |
DE59902877D1 (en) | 2002-10-31 |
KR20010071978A (en) | 2001-07-31 |
EP1108072A1 (en) | 2001-06-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKEX | Expiry |
Effective date: 20190717 |