Method for the manufacture of TWIP steel sheet having an austenitic matrix
US11414721B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 2017 |
| Grant date | Aug 16, 2022 |
| Priority date | — |
| Expiry date | Jul 16, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/004
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for the manufacture of a TWIP steel is provided including: (A) feeding of a slab comprising by weight: 0.5<C<1.2%, 13.0≤Mn<25.0%, S≤0.030%, P≤0.080%, N≤0.1%, Si≤3.0%, 0.051%≤Al≤4.0%, 0.1≤V≤2.5%, and on a purely optional basis, one or more of Nb≤0.5%, B≤0.005%, Cr≤1.0%, Mo≤0.40%, Ni≤1.0%, Cu≤5.0%, Ti≤0.5%, 0.06≤Sn≤0.2%, the remainder of the composition being made of iron and inevitable impurities resulting from the elaboration, (B) reheating the slab and hot rolling the slab to provide a hot rolled slab, (C) coiling the hot rolled slab to provide a coiled slab, (D) first cold-rolling the coiled slab to provide a first cold rolled slab, (E) recrystallization annealing the first cold rolled slab such that an annealed steel sheet having an UTSannealed is obtained and (F) second cold-rolling the annealed steel sheet with a reduction rate CR % that satisfies the following equation A: 1216.472−0.98795*UTSannealed≤(−0.0008*UTSannealed+1.0124)*CR %2+(0.0371*UTSannealed−29.583)*CR %.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.