Method of annealing steel sheets
US10570472B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Dec 10, 2013 |
| Grant date | Feb 25, 2020 |
| Priority date | — |
| Expiry date | Oct 29, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D9/56
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of annealing of steel sheets is provided which includes a first step consisting in fully oxidizing the surface of such steel sheet thus creating a fully oxided surface layer, a second step consisting in selectively oxidizing elements other than iron of such steel, in an area extending under said fully oxided layer, thus creating a selectively oxided internal layer and a third step consisting in fully reducing said fully oxided surface layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.