Process for manufacturing press-hardened coated steel parts and precoated sheets allowing these parts to be manufactured
US9909194B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 2013 |
| Grant date | Mar 6, 2018 |
| Priority date | — |
| Expiry date | Jul 15, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C2/40
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A cold-rolled sheet is provided. The cold-rolled sheet is annealed and pre-coated for the fabrication of press hardened parts, composed of a steel substrate for heat treatment with a carbon content C0 between 0.07% and 0.5%, expressed by weight, and a metal pre-coating on at least the two principal faces of the steel substrate. The substrate comprises a decarburized area on the surface of each of the two principal faces. The depth p50% of the decarburized area is between 6 and 30 micrometers, and p50% is the depth at which the carbon content is equal to 50% of the content C0. The sheet does not contain a layer of iron oxide between the substrate and the metal pre-coating. Processes are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.