HEAT RESISTANT ALLOY Russian patent published in 2010 - IPC C22C30/00 

FIELD: metallurgy.

SUBSTANCE: invention refers to metallurgy, particularly to heat resistant alloys used at fabrication of reaction pipes for gas and oil processing installations operating under temperature 800-1100°C and pressure up to 46 at. Heat resistant alloy contains elements at following ratio, wt %: carbon 0.35÷0.45; silicon 1.20÷1.60; manganese 1.00÷1.50; chromium 24.0÷27.0; nickel 34.0÷36.0; niobium 1.40÷1.90; titanium 0.10÷0. 25; zirconium 0.10÷0.25; cerium 0.005÷0.10; tungsten 0.005÷0.10; sulphur ≤ 0.02; phosphorus ≤ 0.02; lead ≤ 0.007; tin ≤ 0.007; arsenic ≤ 0.007; zinc ≤ 0.007; antimony ≤ 0.007; nitrogen ≤ 0.02; molybdenum ≤ 0.5; copper ≤ 0.2; iron the rest at maintaining the following conditions, wt %: Ni + 32×C + 0.6×Mn + Cu = 48.65 - 51.50; Cr + 3×Ti + Mo +1.6×Si + 0.6×Nb + W = 27.065 ÷ 29.6025.

EFFECT: decreased relative dimension of fine dispersed particles of secondary carbides in austenite grains of alloy, increased homogeneity of fine dispersed particles of secondary carbides and uniformity of their distribution.

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