High-strength steel sheet and method for manufacturing the same
US10697039B2 · kind B2 · utility
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Key dates
| Filing date | Aug 28, 2015 |
| Grant date | Jun 30, 2020 |
| Priority date | — |
| Expiry date | Sep 12, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/008
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Provided are a high-strength steel sheet and a method for manufacturing the steel sheet. The high-strength steel sheet has a specified chemical composition with the balance being Fe and inevitable impurities, a microstructure including, in terms of area ratio, 25% or less of a ferrite phase, 75% or more of a bainite phase and/or a martensite phase, and 5% or less of cementite, in which, in a surface layer that is a region within 50 μm from the surface in the thickness direction, the area ratio of a ferrite phase is 5% to 20%, and a tensile strength is 1180 MPa or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.