STEEL

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FIELD : steel for making parts in automobile manufacture.SUBSTANCE : steel contains, mass% : carbon, 0.8 - 1.2; silicon, 0.2 - 0.6; manganese, 0.4 - 0.8; chrome, 0.4 - 0.8; vanadium, 0.1 - 0.2; rare earth elements, 0.1 - 0.2; calcium, 0.005 - 0.001; nitrogen, 0.05 - 0.1; boron, 0.04 - 0.08; molybdenum, 3.0 - 4.0; cobalt, 0.8 - 1.6; copper, 0.2 - 0.4; iron, the balance.EFFECT : improved strength of steel.1 tbl