IRON

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FIELD : metallurgy.SUBSTANCE : iron contains components at following ratio, wt % : carbon 3.0 - 3.5; silicon 2.3 - 2.9; manganese 0.1 - 0.15; chromium 0.1 - 0.15; copper 0.1 - 0.15; REE (rare earth elements) 0.5 - 0.9; strontium 0.005 - 0.01, vanadium 0.3 - 0.4; zirconium 0.03 - 0.07; iron - the rest.EFFECT : improved quality of ingots out of iron.1 tbl