METHOD OF FABRICATING OF STEEL SHEETS HARDENED WITH FIRING, STEEL SHEETS AND PARTS Russian patent published in 2008 - IPC C21D8/04 C22C38/04 

FIELD: metallurgy.

SUBSTANCE: invention refers to method of fabricating of steel sheets, hardened with firing of sheets. To produce a sheet with high mechanical properties steel is made with composition containing wt %: 0.03≤C≤0.06, 0.50≤Mn≤1.10, 0.08≤Si≤0.20, 0.015≤Al≤0.070, N≤0.007, Ni≤0.040, Cu≤0.040, P≤0.035, S≤0.015, Mo≤0.010, Ti≤0.005, boron at amount of 0.64≤B/N≤1.60, the rest is iron and impurities, conditioned by melting, then a slab is cast out of the said steel; the slab is hot rolled for production of a sheet; at that the temperature at the end of rolling exceeds temperature at point A_r3, then there is performed winding at temperature from 500 to 700°C, cold rolling of the sheet at degree of reducing from 50 to 80%, thermo treatment in form of continuous firing with duration less, than 15 minutes and cold deforming at degree of reducing from 1.2 to 2.5%.

EFFECT: production of steel sheets hardened with firing.

11 cl, 2 ex, 5 tbl