Methods for manufacturing a high-strength press-formed member
US9644247B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 2013 |
| Grant date | May 9, 2017 |
| Priority date | — |
| Expiry date | May 17, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/008
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for manufacturing a high strength press-formed member includes preparing a steel sheet having the composition including by mass %: C: 0.12% to 0.69%, Si: 3.0% or less, Mn: 0.5% to 3.0%, P: 0.1% or less, S: 0.07% or less, Al: 3.0% or less, N: 0.010% or less, Si+Al: at least 0.7%, and remainder as Fe and incidental impurities, heating the steel sheet to a temperature of 750° C. to 1000° C. and retaining the steel sheet in that state for 5 seconds to 1000 seconds; subjecting the steel sheet to hot press-forming at a temperature of 350° C. to 900° C.; cooling the steel sheet to a temperature of 50° C. to 350° C.; heating the steel sheet to a temperature in a temperature region of 350° C. to 490° C.; and retaining the steel sheet at temperature in the temperature region for 5 seconds to 1000 seconds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.