Method for producing a TWIP steel sheet having an austenitic microstructure
US10995381B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 2017 |
| Grant date | May 4, 2021 |
| Priority date | — |
| Expiry date | May 22, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/001
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for the manufacture of a cold rolled, recovered TWIP steel sheet coated with a metallic coating is provided including the following steps: (A) the feeding of a slab having the following composition: 0.1<C<1.2%, 13.0≤Mn<25.0%, S≤0.030%, P≤0.080%, N≤0.1%, Si≤3.0%, and on a purely optional basis, one or more elements such as Nb≤0.5%, B≤0.005%, Cr≤1.0%, Mo≤0.40%, Ni≤1.0%, Cu≤5.0%, Ti≤0.5%, V≤2.5%, Al≤4.0%, 0.06≤Sn≤0.2%, the remainder of the composition making up of iron and inevitable impurities resulting from elaboration; (B) Reheating such slab and hot rolling it; (C) A coiling step; (D) A first cold-rolling; (E) A recrystallization annealing; (F) A second cold-rolling; and (G) A recovery heat treatment performed by hot-dip coating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.