Method for manufacturing high-strength galvannealed steel sheet
US10087500B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 2014 |
| Grant date | Oct 2, 2018 |
| Priority date | — |
| Expiry date | Jun 17, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C2/40
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
There is provided a method for manufacturing a high-strength galvannealed steel sheet having excellent coating adhesiveness and corrosion resistance whose base material is a high-strength steel sheet containing Si and Mn. The method includes performing an oxidation treatment on a steel sheet including Si and Mn in a first zone having an atmosphere of an oxygen concentration in the range of more than 0 vol % and less than 1 vol %, thereafter performing an oxidation treatment in a second zone having an atmosphere of an oxygen concentration in the range of 1 vol % or more, thereafter performing reduction annealing and galvanizing, and further performing an alloying treatment by heating the galvanized steel sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.