SHEET STEEL WITH PLASTICITY INDUCED BY TWINNING HAVING AN AUSTENIC MATRIX Russian patent published in 2019 - IPC C22C38/58 C22C38/38 C22C38/16 C22C38/04 C21D8/02 

FIELD: metallurgy.

SUBSTANCE: invention relates to sheet steel with ductility induced by twinning (TWIP-steel) including an austenitic matrix and subjected to cold rolling and return used in production of automotive vehicles. Steel contains, in wt%: 0.1≤C≤1.2, 13.0≤Mn<25.0, 0.1≤Si≤3.0, 0.1≤Cu≤5.0, S≤0.030, P≤0.080, N≤0.1, 0.1≤Al≤4.0 and 0.1≤V≤2.50, wherein with content of Al<2.0, the weight ratio of Al/V ranges from 0.2 to 8, and with content of Al≥2.0, content V>0.25, optionally one or more elements of: Nb≤0.5, B≤0.005, Cr≤1.0, Mo≤0.40, Ni≤1.0, Ti≤0.5, 0.06≤Sn≤0.2, balance is iron and unavoidable impurities.

EFFECT: obtaining steel, having high strength, excellent deformability and relative elongation.

20 cl, 1 tbl, 1 dwg, 1 ex