WO2004059026A3 - Dual phase hot rolled steel sheets having excellent formability and stretch flangeability - Google Patents
Dual phase hot rolled steel sheets having excellent formability and stretch flangeability Download PDFInfo
- Publication number
- WO2004059026A3 WO2004059026A3 PCT/US2003/040252 US0340252W WO2004059026A3 WO 2004059026 A3 WO2004059026 A3 WO 2004059026A3 US 0340252 W US0340252 W US 0340252W WO 2004059026 A3 WO2004059026 A3 WO 2004059026A3
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mpa
- hot rolled
- temperature
- steel sheets
- dual phase
- Prior art date
Links
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
- 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
- C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
-
- 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
- C21D2211/005—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
-
- 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
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The present invention provides a process of producing a family of hot rolled dual phase steel sheets having excellent: formability and stretch flangeability, with yield strengths of from about 500 MPa to about 900 MPa from a single steel chemistry consisting of, by weight percent, 0.02-0.15 % of C, 0.3-2.5 % of Mn, 0.1-2.0 % of Cr, 0.01-0.2 % Al, 0.001-0.01 % Ca, not more than 0.1 % P, not more than 0.03 % S, not more than 0.2 % Ti, not more than 0.2 % V, not more than 0.2 % Nb, not more than 0.5 % Mo, not more than 0.5 % Cu, not more than 0.5 % Ni, the balance being Fe and unavoidable impurities. A slab or ingot of this composition is reheated to a temperature of between 1050°C and 1350°C and held at this temperature for at least 10 minutes, then hot rolled, completing the hot rolling at between 800°C and 1000°C. The sheet is cooled, immediately after completion of hot rolling, at a rate of not lower than 10°C/sec., without requiring specific cooling patterns, and coiled at a temperature of not less than 450°C. The cooling temperature is controlled to produce the desired yield strength within the range of from about 500 MPa to about 900 MPa.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/321,665 US20040118489A1 (en) | 2002-12-18 | 2002-12-18 | Dual phase hot rolled steel sheet having excellent formability and stretch flangeability |
US10/321,665 | 2002-12-18 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2004059026A2 WO2004059026A2 (en) | 2004-07-15 |
WO2004059026A3 true WO2004059026A3 (en) | 2005-01-20 |
Family
ID=32592949
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2003/040252 WO2004059026A2 (en) | 2002-12-18 | 2003-12-18 | Dual phase hot rolled steel sheets having excellent formability and stretch flangeability |
Country Status (2)
Country | Link |
---|---|
US (1) | US20040118489A1 (en) |
WO (1) | WO2004059026A2 (en) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8337643B2 (en) | 2004-11-24 | 2012-12-25 | Nucor Corporation | Hot rolled dual phase steel sheet |
US7442268B2 (en) * | 2004-11-24 | 2008-10-28 | Nucor Corporation | Method of manufacturing cold rolled dual-phase steel sheet |
US7959747B2 (en) * | 2004-11-24 | 2011-06-14 | Nucor Corporation | Method of making cold rolled dual phase steel sheet |
US11155902B2 (en) | 2006-09-27 | 2021-10-26 | Nucor Corporation | High strength, hot dip coated, dual phase, steel sheet and method of manufacturing same |
US7608155B2 (en) * | 2006-09-27 | 2009-10-27 | Nucor Corporation | High strength, hot dip coated, dual phase, steel sheet and method of manufacturing same |
WO2009048838A1 (en) * | 2007-10-10 | 2009-04-16 | Nucor Corporation | Complex metallographic structured steel and method of manufacturing same |
CN101418416B (en) * | 2007-10-26 | 2010-12-01 | 宝山钢铁股份有限公司 | Low welding crack sensitivity steel plate with yield strength of 800MPa grade and method for producing the same |
CN101956141A (en) * | 2010-10-08 | 2011-01-26 | 莱芜钢铁股份有限公司 | Low-cost non-quenched and tempered high-strength wear-resistant steal plate with yield strength of 780 MPa grade and manufacturing method thereof |
CN103031493B (en) * | 2011-09-29 | 2015-05-06 | 鞍钢股份有限公司 | 650MPa-level low-Si Cr-containing hot-rolled dual phase steel plate and manufacturing method thereof |
JP5321672B2 (en) * | 2011-11-08 | 2013-10-23 | Jfeスチール株式会社 | High-tensile hot-rolled steel sheet with excellent material uniformity and manufacturing method thereof |
KR101638715B1 (en) * | 2012-01-31 | 2016-07-11 | 제이에프이 스틸 가부시키가이샤 | Hot-rolled steel for power generator rim and method for manufacturing same |
UA117592C2 (en) | 2013-08-01 | 2018-08-27 | Арселорміттал | PAINTED GALVANIZED STEEL SHEET AND METHOD OF MANUFACTURING |
CN105925905B (en) * | 2016-05-17 | 2018-07-06 | 武汉钢铁有限公司 | 780MPa grades of hot-rolled dual-phase steels of Nb-Ti systems and its production method |
KR101925717B1 (en) * | 2017-05-11 | 2018-12-05 | 포항공과대학교 산학협력단 | Method of evaluating stretch-flangeability with small scale specimen without specimen size effects |
CN108411206B (en) * | 2018-04-11 | 2020-01-21 | 东北大学 | Thin-specification hot-rolled dual-phase steel with tensile strength of 540MPa and manufacturing method thereof |
CN108411207B (en) * | 2018-04-11 | 2020-01-07 | 东北大学 | Thin-specification hot-rolled dual-phase steel with tensile strength of 600MPa and manufacturing method thereof |
CN110029269A (en) * | 2019-03-29 | 2019-07-19 | 本钢板材股份有限公司 | A kind of 800MPa grades of low cost tempering dual phase steel and preparation method thereof |
CN114892095B (en) * | 2022-06-01 | 2023-07-04 | 张家港扬子江冷轧板有限公司 | High-strength weather-resistant steel for thin-specification S450NH carriage and preparation method thereof |
CN115537661B (en) * | 2022-10-08 | 2024-02-23 | 包头钢铁(集团)有限责任公司 | 600 MPa-level hot dip galvanized dual-phase steel for automobile structure and production method thereof |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4072543A (en) * | 1977-01-24 | 1978-02-07 | Amax Inc. | Dual-phase hot-rolled steel strip |
US6488790B1 (en) * | 2001-01-22 | 2002-12-03 | International Steel Group Inc. | Method of making a high-strength low-alloy hot rolled steel |
-
2002
- 2002-12-18 US US10/321,665 patent/US20040118489A1/en not_active Abandoned
-
2003
- 2003-12-18 WO PCT/US2003/040252 patent/WO2004059026A2/en active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4072543A (en) * | 1977-01-24 | 1978-02-07 | Amax Inc. | Dual-phase hot-rolled steel strip |
US6488790B1 (en) * | 2001-01-22 | 2002-12-03 | International Steel Group Inc. | Method of making a high-strength low-alloy hot rolled steel |
Also Published As
Publication number | Publication date |
---|---|
WO2004059026A2 (en) | 2004-07-15 |
US20040118489A1 (en) | 2004-06-24 |
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