JPS5675521A - Manufacture of cold rolled high tensile steel plate excellent in stretch-flange formability - Google Patents
Manufacture of cold rolled high tensile steel plate excellent in stretch-flange formabilityInfo
- Publication number
- JPS5675521A JPS5675521A JP15210679A JP15210679A JPS5675521A JP S5675521 A JPS5675521 A JP S5675521A JP 15210679 A JP15210679 A JP 15210679A JP 15210679 A JP15210679 A JP 15210679A JP S5675521 A JPS5675521 A JP S5675521A
- Authority
- JP
- Japan
- Prior art keywords
- steel plate
- temperature
- cold rolled
- stretch
- high tensile
- 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
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
Abstract
PURPOSE:To obtain a steel plate having good formability without lowering the mechanical strength by hot rolling steel of specified constituent and composition and raising the coiling temperature and recrystallization temperature at the time of cold rolling. CONSTITUTION:Steel composed of 0.04-0.10% S, 0.50-1.50% Si, 0.20-0.80% Mn, 0.55-1.50% Cr, <=0.05% sol Al, 0.03-0.20% Ti, 0.03-0.50% Mo, 0.05- 0.70% Mo+Ti, 0.01-0.15% Zr and one or more of rare earth elements when necessary, the rest Fe and inevitable impurities is hot rolled at a finishing temperature of >=80 deg.C. After coiling it at 650-700 deg.C coiling temperature, it is cold rolled at a rolling reduction of >=35%. The cold rolled steel plate is recrystallization annealed by box annealing at a temperature >=650 deg.C and below Ac3 transformation point or by continuous annealing at a temperature <=750 deg.C and below A3 transformation point, and temper rolling of <=2% is applied. By this way a cold rolled high tensile steel plate excellent in stretch-flange formability having tensile strength of >=50kg/mm.<2> can be obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15210679A JPS5675521A (en) | 1979-11-26 | 1979-11-26 | Manufacture of cold rolled high tensile steel plate excellent in stretch-flange formability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15210679A JPS5675521A (en) | 1979-11-26 | 1979-11-26 | Manufacture of cold rolled high tensile steel plate excellent in stretch-flange formability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5675521A true JPS5675521A (en) | 1981-06-22 |
| JPS6235460B2 JPS6235460B2 (en) | 1987-08-01 |
Family
ID=15533177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15210679A Granted JPS5675521A (en) | 1979-11-26 | 1979-11-26 | Manufacture of cold rolled high tensile steel plate excellent in stretch-flange formability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5675521A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100514788B1 (en) * | 2000-12-05 | 2005-09-14 | 주식회사 포스코 | A method for manufacturing cold rolled steel sheets having superior surface quality |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2606428B2 (en) * | 1990-09-21 | 1997-05-07 | ティアツク株式会社 | Disk drive head carriage |
-
1979
- 1979-11-26 JP JP15210679A patent/JPS5675521A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100514788B1 (en) * | 2000-12-05 | 2005-09-14 | 주식회사 포스코 | A method for manufacturing cold rolled steel sheets having superior surface quality |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6235460B2 (en) | 1987-08-01 |
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