Cold-rolled steel sheet and method for manufacturing same, and hot-stamp formed body
US10072324B2 · kind B2 · utility
11Cited by
1References
17Claims
0Family size
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Key dates
| Filing date | Aug 5, 2013 |
| Grant date | Sep 11, 2018 |
| Priority date | — |
| Expiry date | Oct 22, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12799
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A cold-rolled steel sheet has a predetermined chemical composition, in which a structure before and after a hot-stamping includes ferrite: 30 area % to 90 area %, martensite: 0 area % or more and less than 20 area %, pearlite: 0 area % to 10 area %, retained austenite: 5 volume % to 20 volume %, and rest structure: bainite, a hardness of the retained austenite measured with a nano indenter before and after the hot-stamping satisfies relations of H2/H1<1.1 and σHM<20, and a relation of TS×El≥20000 MPa·% is satisfied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.