Method for producing a high-strength cold rolled steel sheet having excellent press-formability
US3951696A · kind A · utility
14Cited by
4References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 8, 1974 |
| Grant date | Apr 20, 1976 |
| Priority date | — |
| Expiry date | Aug 8, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/008
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for producing a cold rolled steel sheet having high strength and stretchability which comprises hot rolling a steel containing 0.03 to 0.30% C, less than 0.7% Si, 0.6 to 2.5% Mn, 0.01 to 0.20% sol.Al, not more than 0.015% O with the balance being Fe and unavoidable impurities, cold rolling with a reduction not less than 30%, heating with an average heating rate not less than 3.degree.C/sec. annealing in a temperature range from 650.degree.C to A.sub.3 transformation point for 1 to 15 minutes, and cooling with an average cooling rate of 0.5.degree. to 30.degree.C/sec. down to 500.degree.C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.