JPS6447815A - Manufacture of high-tensile steel plate with low yield ratio - Google Patents
Manufacture of high-tensile steel plate with low yield ratioInfo
- Publication number
- JPS6447815A JPS6447815A JP20486787A JP20486787A JPS6447815A JP S6447815 A JPS6447815 A JP S6447815A JP 20486787 A JP20486787 A JP 20486787A JP 20486787 A JP20486787 A JP 20486787A JP S6447815 A JPS6447815 A JP S6447815A
- Authority
- JP
- Japan
- Prior art keywords
- steel plate
- cooling
- yield ratio
- tensile steel
- 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.)
- Pending
Links
Landscapes
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
PURPOSE:To manufacture a high-tensile steel plate having low yield ratio and sufficient toughness, by rolling a steel containing specific percentages of C, Si, Mn, and SolAl under specific conditions and then successively applying primary cooling and accelerated secondary cooling to the above. CONSTITUTION:A steel consisting of, by weight, 0.02-0.20% C, 0.03-0.60% Si, 0.5-2.5% Mn, <=0.06% SolAl, and the balance Fe with inevitable impurities is rolled at a temp. in a region between 900 deg.C and Ar3 point at >=30% cumulative draft. Subsequently, primary cooling is applied through a temp. region from the Ar3 point and (Ar3 point -80 deg.C) at about 10 deg.C/min cooling rate, by which fine ferrite is precipitated in the rolled steel plate. Further, accelerated secondary cooling is applied down to about 350 deg.C at >=about 8 deg.C/min cooling rate, by which martensite and/or bainite is precipitated in the ferrite. Moreover, tempering consisting of soaking and holding at about 400-650 deg.C for about 30-60min and air cooling is applied, if necessary. By this method, the about 60kgf/mm<2> class high-tensile steel plate having <=about 80% yield ratio and superior toughness can be obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20486787A JPS6447815A (en) | 1987-08-18 | 1987-08-18 | Manufacture of high-tensile steel plate with low yield ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20486787A JPS6447815A (en) | 1987-08-18 | 1987-08-18 | Manufacture of high-tensile steel plate with low yield ratio |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6447815A true JPS6447815A (en) | 1989-02-22 |
Family
ID=16497714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20486787A Pending JPS6447815A (en) | 1987-08-18 | 1987-08-18 | Manufacture of high-tensile steel plate with low yield ratio |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6447815A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0649596A (en) * | 1992-07-30 | 1994-02-22 | Nippon Steel Corp | Steel plate reduced in yield strength in surface layer and excellent in bendability and its production |
| JP2015040322A (en) * | 2013-08-21 | 2015-03-02 | 新日鐵住金株式会社 | Thick steel plate and method for manufacturing the same |
-
1987
- 1987-08-18 JP JP20486787A patent/JPS6447815A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0649596A (en) * | 1992-07-30 | 1994-02-22 | Nippon Steel Corp | Steel plate reduced in yield strength in surface layer and excellent in bendability and its production |
| JP2015040322A (en) * | 2013-08-21 | 2015-03-02 | 新日鐵住金株式会社 | Thick steel plate and method for manufacturing the same |
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