Steel sheet and high strength press hardened steel part having excellent bending and method of manufacturing the same
US12371756B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 2025 |
| Grant date | Jul 29, 2025 |
| Priority date | — |
| Expiry date | Jan 6, 2045 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/008
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A steel sheet having a chemical composition including in wt % C: 0.2-0.4%, Mn: 0.8-2.0%, Si: 0.1-0.5%, Al: 0.01-0.1%, Ti: 0.01-0.1%, B: 0.0005-0.005%, P≤0.040%, Ca≤0.01%, S≤0.006%, N≤0.01%. The steel sheet includes from the bulk to the surface of the coated steel sheet a bulk and a skin layer occupying the outermost 10% of the thickness on either side of the bulk. The bulk is topped by a skin layer occupying the outermost 10% of the thickness on either side of the bulk, the density of TiN/Ti(C,N) inclusions in the skin being smaller than 240 particles/mm2 and the clustering index of MnS inclusions in the skin being lower than 110 μm/mm2. This allows to manufacture hot pressed parts having a tensile strength equal to or greater than 1300 MPa and a bending angle normalized to 1.5 mm and measured in the transverse direction strictly greater than 48°.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.