Automotive steel and a method for the fabrication of the same
US12054816B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 5, 2018 |
| Grant date | Aug 6, 2024 |
| Priority date | — |
| Expiry date | Mar 29, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/008
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A strong and ductile automotive steel comprising 8-11 wt. % Mn, 0.1-0.35 wt. % C, 1-3 wt. % Al, 0.05-0.5 wt. % V, and a balance of Fe. By tuning the amount of austenite stabilizers, a dual phase microstructure of martensite and austenite with proper phase fraction can be achieved at room temperature. The martensite partitions C into the retained austenite grains. The martensite matrix can ensure the higher strength of automotive steel while the retained austenite grains with varied mechanical stability can improve the ductility of automotive steel, achieving the strength of 1500 MPa and the ductility of 20% simultaneously. The method for fabricating this automotive steel circumvents the high quenching temperature of conventional Q&P steels and therefore reduces the production price and is easy for mass production.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.