HIGH-STRENGTH STEEL SHEET OF HIGHER THERMAL HARDENING AND FORMING CAPACITY AND METHOD OF ITS PRODUCTION Russian patent published in 2014 - IPC C22C38/14 C21D8/02 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, particularly to high-strength steel sheet of better thermal hardening and forming capacity. Said sheet is made of steel containing the following components in wt %: 0.0010-0.0040 C, not over 0.05 Si, 0.1-1.0 Mn, not over 0.10 P, not over 0.03 S, 0.01-0.10 Al, not over 0.0050 N, 0.005-0.050 Ti, Fe and unavoidable impurities making the rest. Steel composition features the following ratios: (Ti-3.4×N-1.5×S)/C≤6.0 and Mn/C≥100.

EFFECT: tensile strength TS ≥ 340 MPa, thermal hardening index BH ≥ 30 MPa, uniform elongation El ≤ 18% and elongation after accelerated ageing YP-E1 ≤ 1,0%.

17 cl, 3 dwg, 3 tbl, 1 ex