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FIELD : metallurgy.SUBSTANCE : cast iron contains the following components in wt % : carbon - 3.2-3.6; silicon - 2.0-2.4; manganese - 1.6-2.0; chromium - 0.05-0.1; rare-earth metals - 0.25-0.35; calcium - 0.01-0.015; barium - 0.01-0.015; cobalt - 4.0-5.0; iron making the rest.EFFECT : higher strength.1 tbl