High-strength hot-dip galvannealed steel sheet and method for producing same
US11597983B2 · kind B2 · utility
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Key dates
| Filing date | Mar 26, 2019 |
| Grant date | Mar 7, 2023 |
| Priority date | — |
| Expiry date | Mar 26, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C2/40
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for producing a high-strength hot-dip galvannealed steel sheet, in which a high-strength steel sheet is used as a base material, includes a rolling step (x) of rolling a hot-dip galvannealed steel sheet with a coating layer having an Fe concentration of 8% to 17% by mass, and a heat treatment step (y) of heating the coated steel sheet which has been subjected to the rolling step (x) under the conditions satisfying the following formulae (1) and (2): (273+T)×(20+2×log10(t))≥8000 (1)40≤T≤160 (2)
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.