Method of manufacturing cold rolled dual-phase steel sheet
US7442268B2 · kind B2 · utility
18Cited by
7References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 24, 2004 |
| Grant date | Oct 28, 2008 |
| Priority date | — |
| Expiry date | Feb 6, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/06
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A steel sheet having (a) a dual phase microstructure with a martensite phase and a ferrite phase and (b) a composition containing by percent weight: 0.01% to 0.2% C; 0.3% to 3% Mn; 0.05% to 2% Si; 0.1% to 2% Cr; 0.01% to 0.10 Al; and 0.0005% to 0.01% Ca, with the balance of the composition being iron and incidental ingredients. Also, the steel sheet is made by a batch annealing method, and has a tensile strength of at least approximately 400 MPa and an n-value of at least approximately 0.175.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.