High-strength cold-rolled steel sheet and method of manufacturing the same
US10077486B2 · kind B2 · utility
3Cited by
0References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2014 |
| Grant date | Sep 18, 2018 |
| Priority date | — |
| Expiry date | Apr 4, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/008
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A high-strength cold-rolled steel sheet has a composition and a microstructure. The microstructure comprises: ferrite having an average grain size of 5 μm or less and a volume fraction of 3% to 20%, retained austenite having a volume fraction of 5% to 20%, and martensite having a volume fraction of 5% to 20%, the remainder being bainite and/or tempered martensite. The total number of retained austenite with a grain size of 2 μm or less, martensite with a grain size of 2 μm or less, or a mixed phase thereof is 150 or more per 2,000 μm2 of a thickness cross section parallel to the rolling direction of the steel sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.