Hot forming method and a hot formed member
US7559998B2 · kind B2 · utility
15Cited by
2References
8Claims
0Family size
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Key dates
| Filing date | Nov 28, 2005 |
| Grant date | Jul 14, 2009 |
| Priority date | — |
| Expiry date | Nov 2, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D7/13
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A hot press-formed member having stable strength and toughness is manufactured from a high strength steel sheet by hot press forming. In the cooling stage during hot press forming, the cooling rate is at least the critical cooling rate until the Ms point is reached and it is then in the range of 25-150° C./s in the temperature range from the Ms point to 200° C. The Vickers hardness of the hot pressed member is less than the value of (maximum quenching hardness—10) and at least the value of (maximum quenching hardness—100).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.