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FIELD : iron and steel metallurgy.SUBSTANCE : iron consists of, mas. % : carbon 2.8-3.2; silicon 1.8-2.2; manganese 0.5-1.0; magnesium 0.05-0.1; REM (rare earth metals) 0.2-0.3; copper 0.06-0.1; nickel 2.5-3.5; zirconium 1.0-2.0; molybdenum 1.0-2.0; iron - the rest.EFFECT : iron possesses high strength.1 tbl