METHOD OF PRODUCING AUSTENITIC SHEET STEEL WITH PLASTICITY INDUCED BY TWINNING

摘要

FIELD: metallurgy.;SUBSTANCE: present invention relates to a method of producing sheet steel with plasticity induced by twinning used in making automotive vehicles. Reheating and hot rolling of slab with following composition, wt%: 0.1C1.2, 13.0≤Mn25.0, S≤0.030, P≤0.080, N≤0.1, Si≤3.0, optionally one or more elements of: 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 and 0.06≤Sn≤0.2, the rest is iron and unavoidable impurities. Roll is rolled, the first cold rolling, recrystallization annealing, the second cold rolling and heat treatment for return, which is performed as a result of coating application at immersion into the melt.;EFFECT: obtaining sheet steel with high strength, excellent deformability and relative elongation.;20 cl, 1 tbl, 1 ex