High strength steel sheet and high strength galvanized steel sheet excellent in shapeability and methods of production of same
US9896751B2 · kind B2 · utility
6Cited by
1References
12Claims
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Key dates
| Filing date | Jul 27, 2012 |
| Grant date | Feb 20, 2018 |
| Priority date | — |
| Expiry date | Mar 25, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12799
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
High strength steel sheet and high strength galvanized steel sheet which are excellent in shapeability which secure a tensile maximum strength 900 MPa or more high strength while obtaining excellent ductility and stretch flangeability, which sheets have predetermined compositions of ingredients, have steel sheet structures which contain volume fraction 1 to 20% of residual austenite phases, and which have martensite transformation points of the residual austenite phases of −60° C. or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.