High-strength steel sheet and production method therefor
US10472697B2 · kind B2 · utility
4Cited by
4References
16Claims
0Family size
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Key dates
| Filing date | Jan 27, 2016 |
| Grant date | Nov 12, 2019 |
| Priority date | — |
| Expiry date | Sep 10, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/008
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A steel sheet has a microstructure that contains ferrite in an area ratio of 20% or more, martensite in an area ratio of 5% or more, and tempered martensite in an area ratio of 5% or more. The ferrite has a mean grain size of 20.0 μm or less. An inverse intensity ratio of γ-fiber to α-fiber in the ferrite is 1.00 or more and an inverse intensity ratio of γ-fiber to α-fiber in the martensite and the tempered martensite is 1.00 or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.