Method of press-hardening a hot-shapable plate
US11891673B2 · kind B2 · utility
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Key dates
| Filing date | Jun 9, 2021 |
| Grant date | Feb 6, 2024 |
| Priority date | — |
| Expiry date | Apr 29, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/32
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A hot-shapable uncoated steel-plate workpiece is press hardened by first transporting the plate through a heating zone continuously or discontinuously and there heating the plate to an austenitizing temperature while blocking entry of oxygen into the heating zone. Then the heated plate is cooled in a cooling zone to a martensitizing temperature below the austenitizing temperature without contacting the heated plate with oxygen. Finally, immediately and without cooling of the cooled workpiece to a martensite start temperature, the cooled workpiece is deformed at least partially in a finishing press into a desired shape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.