JPS6455335A - Production of high-tensile steel having low yield ratio - Google Patents
Production of high-tensile steel having low yield ratioInfo
- Publication number
- JPS6455335A JPS6455335A JP62212591A JP21259187A JPS6455335A JP S6455335 A JPS6455335 A JP S6455335A JP 62212591 A JP62212591 A JP 62212591A JP 21259187 A JP21259187 A JP 21259187A JP S6455335 A JPS6455335 A JP S6455335A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- temp
- yield ratio
- range
- point
- 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
Abstract
PURPOSE:To stably obtain the title high-tensile steel having <=85% yield ratio and >=50kgf/mm<2> tensile strength and further high toughness by heating a low alloy steel slab to control the austenite grain size to less than a prescribed value, hot-rolling, cooling, and then annealing the steel in a specified temp. range. CONSTITUTION:A low alloy steel is heated to 950-1,250 deg.C, and firstly rolled at >=30% draft at a temp. range >=100 deg.C higher than the Ar3 point to control the austenite grain size to <=No.5. The sufficiently refined austenite is rolled at 10-60% draft at a temp. range from the Ar3 point to the temp. less than 100 deg.C higher than the Ar3 point in accordance with the desired yield ratio and tensile strength. The finish-rolled steel is then air-cooled for 10-80sec, and then cooled to <=500 deg.C at a cooling rate higher than the air cooling. The cooled steel is annealed, as required, in the temp. range 400 deg.C-Ac1 point, and the desired high-tensile steel having a low yield ratio is obtained.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62212591A JPH066740B2 (en) | 1987-08-26 | 1987-08-26 | Low yield ratio thick wall high strength steel manufacturing method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62212591A JPH066740B2 (en) | 1987-08-26 | 1987-08-26 | Low yield ratio thick wall high strength steel manufacturing method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6455335A true JPS6455335A (en) | 1989-03-02 |
JPH066740B2 JPH066740B2 (en) | 1994-01-26 |
Family
ID=16625233
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62212591A Expired - Fee Related JPH066740B2 (en) | 1987-08-26 | 1987-08-26 | Low yield ratio thick wall high strength steel manufacturing method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH066740B2 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02282418A (en) * | 1989-04-24 | 1990-11-20 | Kawasaki Steel Corp | Production of high tensile strength steel sheet excellent in internal quality and workability |
JPH04202619A (en) * | 1990-11-29 | 1992-07-23 | Kobe Steel Ltd | Production of 60kgf/mm2 class steel plate excellent in welding crack resistance and having low yield ratio |
JPH0545802A (en) * | 1991-08-13 | 1993-02-26 | Fuji Photo Film Co Ltd | Film unit with lens |
JPH0665682A (en) * | 1992-08-25 | 1994-03-08 | Kobe Steel Ltd | High tensile strength steel plate over 570n/mm2 class excellent in weldability and reduced in yield ratio |
US5938865A (en) * | 1995-05-15 | 1999-08-17 | Sumitomo Metal Industries, Ltc. | Process for producing high-strength seamless steel pipe having excellent sulfide stress cracking resistance |
JP2005118886A (en) * | 2004-12-06 | 2005-05-12 | Jfe Steel Kk | Thin hot-rolled steel sheet manufacturing method |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5852423A (en) * | 1981-09-21 | 1983-03-28 | Kawasaki Steel Corp | Manufacture of unnormalized high tensile boron steel with superior toughness at low temperature and superior weldability |
JPS5877527A (en) * | 1981-10-31 | 1983-05-10 | Nippon Steel Corp | Manufacture of high-strength and high-toughness steel |
JPS5896817A (en) * | 1981-12-07 | 1983-06-09 | Sumitomo Metal Ind Ltd | Production of high tensile hot rolled steel material having high toughness |
JPS5896818A (en) * | 1981-12-07 | 1983-06-09 | Sumitomo Metal Ind Ltd | Production of hot-rolled steel material having high strength and excellent low temperature toughness |
JPS5983722A (en) * | 1982-11-05 | 1984-05-15 | Kawasaki Steel Corp | Preparation of low carbon equivalent unnormalized high tensile steel plate |
-
1987
- 1987-08-26 JP JP62212591A patent/JPH066740B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5852423A (en) * | 1981-09-21 | 1983-03-28 | Kawasaki Steel Corp | Manufacture of unnormalized high tensile boron steel with superior toughness at low temperature and superior weldability |
JPS5877527A (en) * | 1981-10-31 | 1983-05-10 | Nippon Steel Corp | Manufacture of high-strength and high-toughness steel |
JPS5896817A (en) * | 1981-12-07 | 1983-06-09 | Sumitomo Metal Ind Ltd | Production of high tensile hot rolled steel material having high toughness |
JPS5896818A (en) * | 1981-12-07 | 1983-06-09 | Sumitomo Metal Ind Ltd | Production of hot-rolled steel material having high strength and excellent low temperature toughness |
JPS5983722A (en) * | 1982-11-05 | 1984-05-15 | Kawasaki Steel Corp | Preparation of low carbon equivalent unnormalized high tensile steel plate |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02282418A (en) * | 1989-04-24 | 1990-11-20 | Kawasaki Steel Corp | Production of high tensile strength steel sheet excellent in internal quality and workability |
JPH04202619A (en) * | 1990-11-29 | 1992-07-23 | Kobe Steel Ltd | Production of 60kgf/mm2 class steel plate excellent in welding crack resistance and having low yield ratio |
JPH0545802A (en) * | 1991-08-13 | 1993-02-26 | Fuji Photo Film Co Ltd | Film unit with lens |
JPH0665682A (en) * | 1992-08-25 | 1994-03-08 | Kobe Steel Ltd | High tensile strength steel plate over 570n/mm2 class excellent in weldability and reduced in yield ratio |
US5938865A (en) * | 1995-05-15 | 1999-08-17 | Sumitomo Metal Industries, Ltc. | Process for producing high-strength seamless steel pipe having excellent sulfide stress cracking resistance |
JP2005118886A (en) * | 2004-12-06 | 2005-05-12 | Jfe Steel Kk | Thin hot-rolled steel sheet manufacturing method |
Also Published As
Publication number | Publication date |
---|---|
JPH066740B2 (en) | 1994-01-26 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |