Ultra high strength cold rolled steel sheet having excellent bendability
US8951367B2 · kind B2 · utility
9Cited by
2References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 16, 2011 |
| Grant date | Feb 10, 2015 |
| Priority date | — |
| Expiry date | Feb 24, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/008
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A cold rolled steel sheet with excellent bendability contains C at 0.15 to 0.30%, Si at 0.01 to 1.8%, Mn at 1.5 to 3.0%, P at not more than 0.05%, S at not more than 0.005%, Al at 0.005 to 0.05% and N at not more than 0.005%, the balance being Fe and inevitable impurities, and has a steel sheet superficial soft portion satisfying:Hv(S)/Hv(C)≦0.8 (1)wherein Hv(S) is hardness of the steel sheet superficial soft portion, and Hv(C) is hardness of a steel sheet core portion,0.10≦t(S)/t≦0.30 (2)wherein t(S) is thickness of the steel sheet superficial soft portion, and t is the sheet thickness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.