Hot-rolled steel sheet and method for producing same
US10167539B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 2017 |
| Grant date | Jan 1, 2019 |
| Priority date | — |
| Expiry date | Mar 15, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12799
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A hot-rolled steel sheet wherein an average pole density of orientation group of {100}<011> to {223}<110> is 1.0 to 5.0 and pole density of crystal orientation {332}<113> is 1.0 to 4.0. The hot-rolled steel sheet includes, as a metallographic structure, by area %, 30% to 99% ferrite and bainite in total, and 1% to 70% martensite. The hot-rolled steel sheet satisfies Expression 1: dia≤13 μm, and also satisfies Expression 2: TS/fM×dis/dia≥500, wherein an area fraction of the martensite is defined as fM in unit of area %, an average size of the martensite is defined as dia in unit of μm, an average distance between the martensite is defined as dis in unit of μm, and tensile strength of the steel sheet is defined as TS in unit of MPa.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.