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FIELD : metallurgy.SUBSTANCE : iron contains elements at a following ratio, mas.% : carbon 2.8-3.6; silicon 1.6-2.0; manganese 0.5-1.0; magnesium 0.01-0.02; REM (rare earth metals) 0.2-0.4; copper 0.1-0.2; aluminium 0.1-0.2; chromium 0.2-0.3; tin 0.005-0.01; molybdenum 3.0-3.5; iron - the rest.EFFECT : upgrading of iron srength.1 tbl