Hot-pressed member, cold-rolled steel sheet for hot pressing, and manufacturing methods therefor
US12215405B2 · kind B2 · utility
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Key dates
| Filing date | Jan 17, 2020 |
| Grant date | Feb 4, 2025 |
| Priority date | — |
| Expiry date | Dec 13, 2041 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C2/40
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Provided is a hot-pressed member that combines both high strength of 1850 MPa or more in TS and excellent delayed fracture resistance. A hot-pressed member comprises: a predetermined chemical composition; a microstructure in which a prior austenite average grain size is 8 μm or less, a volume fraction of martensite is 95% or more, and a volume fraction of granular carbide of 0.1 μm or more in grain size is 0.10% to 4.0%; a Ni diffusion region of 2.0 μm or more in a depth direction in a surface layer; and a tensile strength of 1850 MPa or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.