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FIELD : metallurgy.SUBSTANCE : invention concerns metallurgy field. Particularly it concerns cast iron content. Cast iron contents components at a following ratio, mass % : carbon 2.8-3.2; silicon 1.8-2.2; manganese 1.8-2.2; chrome 0.8-1.2; nickel 0.8-1.2; vanadium 0.1-0.2; copper 0.8-1.2; titanium 0.1-0.2; barium 0.005-0.01; niobium 0.1-0.2; phosphorus 0.08-0.12; rare-earth metals 0.01-0.02; aluminium 0.3-0.4; boron 0.3-0.4; iron - the rest.EFFECT : improving of cast iron endurance.1 tbl