Process of manufacturing a cold rolled steel sheet having excellent press formability
US4576657A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1985 |
| Grant date | Mar 18, 1986 |
| Priority date | — |
| Expiry date | Aug 13, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D8/0426
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Based on the investigation as to the correlative relationship between the composition of a steel material, particularly the content of carbon and a soaking temperature for the hot rolling, the improvements of the stretch formability, deep-drawability and aging resistance of the cold rolled steel sheet and the peculiar behaviors of the effective additive ingredients under the above correlative relationship, a cold rolled steel sheet having excellent press-formability is obtained by soaking at 800.degree.-1,100.degree. C., a steel slab consisting of not more than 1.2% by weight of Si, 0.05-1.00% by weight of Mn, not more than 0.150% by weight of P, at least one of elements selected from the group consisting of Nb, Cr, Ti, Al, B and W in a total amount of 0.002-0.150% by weight in an extremely low range of not more than 0.005% by weight of C, followed by ordinary hot rolling, cold rolling and recrystallization annealing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.