FIELD: metallurgy.
SUBSTANCE: proposed composition contains the following substances, in wt. %: carbon from 0.18 to less than 0.2, manganese 1.00-1.3, silicon 0.20-0.40, sulphur not over 0.010, phosphorus not over 0.015, chromium 2.90-3.20, copper not over 0.25, nickel 2.20-2.50, molybdenum 0.70-0.90, vanadium 0.15-0.20, iron and unavoidable impurities making the rest. After quenching in air and heat treatment, temporary tear resistance σB makes at least 170 kgf/mm2, while elongation δ5 makes at least 6%.
EFFECT: higher strength.
1 dwg, 5 tbl, 1 ex
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