METHOD FOR PRODUCTION OF HEAVY-DUTY HIGH-STRENGTH WEAR-RESISTANT ROLLED STOCK (VERSIONS) Russian patent published in 2019 - IPC C21D8/02 C22C38/54 

FIELD: metallurgy.

SUBSTANCE: invention refers to metallurgy, particularly to production of rolled stock with thickness of up to 50 mm. Disclosed are five versions of method implementation, each of the versions of the method includes melting of steel containing, wt%: carbon 0.18–0.28, silicon 0.20–0.70, manganese 0.50–1.60, phosphorus not more than 0.025, sulfur not more than 0.010, nickel 0.03–1.50, chrome 0.03–1.00, copper 0.03–0.50, molybdenum 0.03–0.60, niobium 0.01–0.08, titanium 0.005–0.05, aluminum 0.035–0.08, calcium 0.001–0.01, nitrogen not more than 0.008, boron 0.001–0.005, iron and unavoidable impurities – the rest, wherein at ratio Ti/N<3.42, the minimum allowable aluminum content is determined from the ratio Al=0.035+(3.42×N-Ti)×1.93, where N, Ti is content of nitrogen and titanium in steel, carbon equivalents of CET and CEV are not more than 0.43 % and 0.60 % respectively, its out-of-furnace treatment, continuous casting into slabs, slabs heating in the temperature range of 950–1,200 °C, multi-pass hot rolling, accelerated cooling to temperature of 20–400 °C at rate of 9–40 °C/s and tempering at 150–400 °C, wherein the second version of the method is characterized by the quenching mode, the third version is characterized by the rolling mode, the fourth and the fifth versions by the rolling and quenching modes.

EFFECT: improving strength properties, impact viscosity and hardness while maintaining sufficient ductility.

5 cl, 3 tbl