High strength steel sheet and method for production thereof
US7754030B2 · kind B2 · utility
4Cited by
4References
9Claims
0Family size
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Key dates
| Filing date | Nov 30, 2005 |
| Grant date | Jul 13, 2010 |
| Priority date | — |
| Expiry date | Mar 28, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/005
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A high-strength steel sheet has a metal structure consisting of a ferrite phase in which a hard second phase is dispersed and has 3 to 30% of an area ratio of the hard second phase. In the ferrite phase, the area ratio of nanograins of which grain sizes are not more than 1.2 μm is 15 to 90%, and dS as an average grain size of nanograins of which grain sizes are not more than 1.2 μm and dL as an average grain size of micrograins of which grain sizes are more than 1.2 μm satisfy an equation (dL/dS≧3).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.