STEEL

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FIELD : metallurgy.SUBSTANCE : steel contains carbon, silicon, manganese, chrome, titanium, aluminium, rare-earth metals, calcium, niobium, vanadium and iron at following ratio of components, wt % : carbon 0.01 - 0.02, silicon 0.1 - 0.2, manganese 0.2 - 0.4, chrome 17.0 - 19.0, titanium 2.2 - 2.6, aluminium 2.6 - 3.2, rare-earth metals 0.7 - 0.9, boron 0.001 - 0.003, calcium 0.005 - 0.01, niobium 0.3 - 0.4, vanadium 0.4 - 0.6, iron - the rest.EFFECT : impact resistance of steel is increased.1 tbl