Hot rolled steel sheet and associated manufacturing method
US10858716B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 2015 |
| Grant date | Dec 8, 2020 |
| Priority date | — |
| Expiry date | Jan 26, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/005
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention provides a hot rolled steel sheet with yield stress greater than 680 MPa and less than or equal to 840 MPa a tensile strength between 780 MPa and 950 MPa, elongation at failure greater than 10% and hole-expansion ratio (Ac) greater than or equal to 45%. The chemical composition includes, with the contents expressed by weight: 0.05%≤Mo≤0.35%, 0.15<C≤0.6% when 0.05%≤Mo≤0.11%, or 0.10%≤Cr≤0.6% when 0.11%<Mo≤0.35%. The microstructure includes at least 70% granular bainite, less than 20% ferrite, with the remainder, if any, including lower bainite, martensite and residual austenite. The sum of the martensite and residual austenite contents is less than 5%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.