Hot-dip galvannealed steel sheet for hot stamping and method for manufacturing steel part
US10406780B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 2014 |
| Grant date | Sep 10, 2019 |
| Priority date | — |
| Expiry date | Sep 27, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C2/40
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Provided is a hot-dip galvannealed steel sheet for hot stamping use, in which a base steel sheet contains Si in an amount of 0.7% or more, and which has excellent joint strength at a spot-welded part and can exhibit excellent adhesion to a coating film after hot stamping and coating with requiring little restriction of a hot stamp step. In the hot-dip galvannealed steel sheet, a base steel sheet contains, in mass %, 0.10 to 0.5% of C, 0.7 to 2.5% of Si, 1.5 to 3% of Mn and 0.01 to 0.5% of Al. The hot-dip galvannealed steel sheet is characterized in that the Mn concentration in a plating layer is 0.20% or more, the plated amount is 75 g/m2 or less, and the oxygen concentration at the interface between the plating layer and the base steel sheet is 0.50% or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.