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FIELD : metallurgy.SUBSTANCE : cast iron contains, wt % : carbon 2.2-2.4; silicon 0.2-0.4; manganese 0.4-0.8; chrome 10.0-15.0; vanadium 0.4-0.8; rare-earth metals 0.05 -0.15; nickel 1.5 -3.0; titanium 0.05-0.1; cobalt 5.0-6.5; copper 0.3-0.5; iron-the rest.EFFECT : increased crack resistance of cast iron.1 tbl