High-strength hot rolled steel sheet and method for manufacturing same
US12065711B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 2019 |
| Grant date | Aug 20, 2024 |
| Priority date | — |
| Expiry date | Mar 24, 2041 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/60
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A high-strength hot rolled steel sheet and a method for manufacturing the high-strength hot rolled steel sheet are disclosed. The high-strength hot rolled steel sheet includes a specific chemical composition, and a steel structure in which a lower bainite phase and/or a tempered martensite phase at 90% or more in terms of a total area fraction is contained as a dominant phase, an average grain size of the dominant phase is 10.0 μm or less, and an amount of Fe in Fe-based precipitates is 0.70% or less in mass %, in which an arithmetic average roughness (Ra) of a surface is 2.50 μm or less, and a tensile strength TS is 1180 MPa or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.