Steel sheet and method for manufacturing the same
US11220722B2 · kind B2 · utility
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19Claims
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Key dates
| Filing date | Aug 29, 2017 |
| Grant date | Jan 11, 2022 |
| Priority date | — |
| Expiry date | Apr 23, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C18/04
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Provided are a steel sheet having a tensile strength of 950 MPa or more and good toughness and a method for manufacturing the same.The steel sheet has a specific composition and a metallographic structure containing: a ferrite area fraction of 30% or less (including 0%), a tempered martensite area fraction of 70% or more (including 100%), and a retained austenite area fraction of 4.5% or less (including 0%), wherein the average aspect ratio of an iron based carbide, precipitated in tempered martensite grains, having a grain size in the largest 10% is 3.5 or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.