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 installations operating at production of ethylene at temperature 900-1160°C and pressure up to 6 at. Heat resistant alloy contains elements at following ratio, wt %: carbon 0.34÷0.45; silicon 1.60÷2.10; manganese 1.00÷1.50; chromium 34.0÷36.0; nickel 43.0÷47.0; tungsten 0.005÷0.10; vanadium 0.005÷0.10; titanium 0.10÷0.25; zirconium 0.10÷0.25; cerium 0.005÷0.10; niobium 1.40÷1.90; sulphur ≤ 0.025; phosphorus ≤ 0.025; lead ≤ 0.007; tin ≤ 0.007; arsenic ≤ 0.007; zinc ≤ 0.007; antimony ≤ 0.007; nitrogen ≤ 0.01; copper ≤ 0.2; iron the rest at maintaining the following conditions, wt %: Ni + 32×C + 0.6×Mn + Cu= 58.65 ÷ 62.50; Cr + 3×Ti + V + 1.6×Si + 0.6×Nb + W = 37.705 ÷ 39.5275. The alloy facilitates reduced relative dimension of fine dispersed particles of secondary carbides in austenite grains of the alloy, increased homogeneity of fine dispersed particles of secondary carbides and uniformity of their distribution.

EFFECT: upgraded heat resistance of alloy.

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