Galvanized steel sheet, member, and method for producing them
US12398451B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 2021 |
| Grant date | Aug 26, 2025 |
| Priority date | — |
| Expiry date | Oct 2, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C2/06
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A galvanized steel sheet including a steel sheet having a chemical composition with an equivalent carbon content Ceq of 0.60% or more and less than 0.85%, and a specified steel microstructure; and a galvanized layer on a surface of the steel sheet. The retained austenite has a solute C content of 0.6% or more by mass, and retained austenite grains with an aspect ratio of less than 2.0 constitute 50% or more of all retained austenite grains. In 90-degree bending at a curvature radius/thickness ratio of 4.2 in a rolling (L) direction with respect to an axis extending in a width (C) direction, an L cross section in a 0- to 50-μm region from a surface of the steel sheet on a compression side has a number density of voids of 1500/mm2 or less, and the galvanized steel sheet has a tensile strength of 980 MPa or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.