High strength steel sheet
US11261505B2 · kind B2 · utility
1Cited by
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20Claims
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Key dates
| Filing date | Feb 20, 2018 |
| Grant date | Mar 1, 2022 |
| Priority date | — |
| Expiry date | Dec 26, 2038 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12986
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
High strength steel sheet having a tensile strength of 800 MPa or more comprising a middle part in sheet thickness and a soft surface layer arranged at one side or both sides of the middle part in sheet thickness, wherein each soft surface layer has a thickness of more than 10 μm and 30% or less of the sheet thickness, the soft surface layer has an average Vickers hardness of 0.60 time or less the average Vickers hardness of the sheet thickness ½ position, and the soft surface layer has a nano-hardness standard deviation of 0.8 or less is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.