Method for making a high strength multiphase steel
US11047020B2 · kind B2 · utility
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4References
21Claims
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Key dates
| Filing date | Apr 30, 2019 |
| Grant date | Jun 29, 2021 |
| Priority date | — |
| Expiry date | Dec 19, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/008
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for producing a cold rolled and hot dip coated steel sheet is provided. The method includes casting a steel into a slab, reheating, hot rolling, cooling, coiling, descaling and cold rolling the slab. The cold rolled steel sheet is annealed so a layer of iron oxide forms on the surface with an internal oxidation underneath. The sheet is then heated so the surface is oxidized and the layer of iron oxide is fully reduced to obtain an internally oxidized depth between 200 nm and 100 μm which includes one or more of Si, Mn, Al, Ti containing oxides. The sheet is then hot dip coated and cooled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.