Method of making cold rolled dual phase steel sheet
US7959747B2 · kind B2 · utility
7Cited by
47References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 22, 2008 |
| Grant date | Jun 14, 2011 |
| Priority date | — |
| Expiry date | Sep 25, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/38
- 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≦C≦0.2; 0.3≦Mn≦3; 0.05≦Si≦2; 0.2≦Cr+Ni≦2; 0.01≦Al≦0.10; 0.0005≦Ca≦0.01, 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 megapascals and an n-value of at least approximately 0.175.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.