STEEL

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FIELD : manufacture of equipment for petroleum refining industry.SUBSTANCE : proposed steel contains the following constituents, mass-% : carbon, 0.2-0.4; silicon, 0.2-0.4; manganese, 0.3-0.8; chromium, 15.0-20.0; nickel, 2.0-2.5; copper, 0.3-0.8; nitrogen, 0.03-0.08; titanium, 0.1-0.2; niobium, 0.3-0.8; rare-earth metals, 0.2-0.4; magnesium, 0.03-0.08; molybdenum, 3.0-4.0; cobalt, 0.3-0.8; the remainder being iron.EFFECT : enhanced strength of steel.1 tbl