HEAT-RESISTANT ALLOY Russian patent published in 2002 - IPC

FIELD: metallurgy. SUBSTANCE: invention relates to composites of heat-resistant low-carbon chrome- -nickel alloys of austenite class. Invention proposes heat-resistant alloy comprising components taken in the following ratio, wt. -%: carbon, 0.05, not above; silicon, 0.0005-0.65; manganese, 0.0005-0.74; chrome, 19.0-23.0; nickel, 30.0-34.0; titanium, 0.25-0.60; aluminum, 0.0005-0.45; vanadium, 0.0005-0.10; tungsten, 0.0005-0.10; iron, the balance. Content of sulfur, phosphorus, lead, tin, arsenic, zinc, molybdenum and copper in heat-resistant alloy does not exceed the following values, wt.-%: sulfur, 0.02; phosphorus, 0.03; lead, 0.01; tin, 0.01; arsenic, 0.01; zinc, 0.01; molybdenum, 0.5 and copper, 0.2. The following conditions must be maintained simultaneously: % Ni + 32% C + 0.6% Mn + %Cu = 32.24904-36.244%; %Cr + 3% Ti + % V + % Mo + 1.6% Si + % W = 19.7518-25.18236%. Invention can be used in making reaction tubes of petroleum-gas- processing devices working at temperature 700-950 C under pressure below 50 atm. Invention provides increase of average grain size and enhancement of uniformity of alloy structure. EFFECT: enhanced heat resistance of alloy. 3 cl