Hot-pressed steel sheet member
US10273555B2 · kind B2 · utility
1Cited by
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5Claims
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Key dates
| Filing date | Dec 27, 2013 |
| Grant date | Apr 30, 2019 |
| Priority date | — |
| Expiry date | Aug 23, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2221/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A hot-pressed steel sheet member includes a specific chemical composition and further includes a steel structure in which an area ratio of ferrite in a surface layer portion ranging from a surface to 15 μm in depth is greater than 1.20 times an area ratio of ferrite in an inner layer portion being a portion excluding the surface layer portion, and the inner layer portion contains a steel structure represented, in area %, ferrite: 10% to 70%, martensite: 30% to 90%, and a total area ratio of ferrite and martensite: 90% to 100%. A tensile strength of the hot-pressed steel sheet member is 980 MPa or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.