High-strength steel sheet and method for producing same
US11913087B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 2018 |
| Grant date | Feb 27, 2024 |
| Priority date | — |
| Expiry date | Mar 3, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/008
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Provided is a high-strength steel sheet having excellent ductility, bendability, and TS of 500 MPa or more, in particular, a high-strength thin steel sheet for cans having a sheet thickness of 0.1 to 0.8 mm, the steel sheet having a chemical composition containing C: 0.03-0.15%, Si: 0.01-0.05%, Mn: more than 0.6% and 1.5% or less, P: 0.025% or less, S: 0.02% or less, Al: 0.01-0.10%, N: 0.0005-0.0100%, Ti: 0.005-0.020%, B: 0.0005-0.0100%, and Nb: 0.0050-0.0200% with the balance being Fe and inevitable impurities, in which the steel sheet has a metallic structure containing, in area ratio, 85% or more of ferrite and 1-10% of martensite, the martensite has a grain size of 5 μm or less, and a ratio of martensite having a grain size of 2 μm or less is 80% or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.