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FIELD : metallurgy.SUBSTANCE : steel consists of, mas. % : carbon 0.03-0.08; silicon 0.1-0.2; manganese 0.7-1.3; chromium 13.0-17.0; nickel 13.0-17.0; molybdenum 3.5-5.5; nitrogen 0.05-0.1; niobium 0.2-0.4; vanadium 0.1-0.2; magnesium 0.003-0.008; zirconium 0.1-0.2; REE (rare earth elements) 0.08-0.15; iron - the rest.EFFECT : upgrading of steel tensile strength.1 tbl