Steel sheet for crown cap, crown cap and method for producing steel sheet for crown cap
US11359255B2 · kind B2 · utility
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7Claims
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Key dates
| Filing date | Jul 25, 2018 |
| Grant date | Jun 14, 2022 |
| Priority date | — |
| Expiry date | Aug 5, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/005
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A steel sheet for crown cap having: a chemical composition containing, C, Si, Mn, P, S, Al, N, with the balance being Fe and inevitable impurities; a ferrite phase in a region from a depth of ¼ of a sheet thickness to a mid-thickness part, the ferrite phase having a standard deviation of ferrite grain size of 7.0 μm or less; a yield strength of 560 MPa or more and 700 MPa or less in a rolling direction; and a difference of 25 MPa or more between a yield strength in a 2% strain tensile test and a yield strength in a tensile test after heat treatment at 170° C. for 20 minutes, in the rolling direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.