HIGH-STRENGTH ARMOUR STEEL AND PRODUCTION OF SHEETS THEREOF Russian patent published in 2014 - IPC C22C38/44 F41H1/02 F41H5/02 C21D9/42 

FIELD: metallurgy.

SUBSTANCE: proposed steel contains components in the following ratio in wt %: carbon - 0.28-0.40, silicon - 0.80-1.40, manganese - 0.50-0.80, chromium - 0.10-0.70, nickel - 1.50-2.20, molybdenum - 0.30-0.80, aluminium - 0.005-0.05, copper - not over 0.30, sulphur - not over 0.012, phosphorus - not over 0.015, iron making the rest. Molybdenum-to-carbon ratio makes 0.8-2.0. Steel blanks are heated to hot deformation temperature to carry out rolling at specified reduction and to quench with tempering. Quenching is performed at press with cooling in water at the pressure of 150-500 kg/cm² and water flow rate of 0.2-0.5 m³/h.

EFFECT: higher bullet-proof properties.

4 cl, 2 tbl