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 pipes for collectors of high temperature installations operating at production of hydrogen, methanol, and ammonia at temperature 800-1000°C and pressure up to 46 at. Heat resistant alloy contains wt %: carbon >0.1÷0.14; silicon ≤0.80; manganese 0.50÷1.20; chromium 22.0÷25.0; nickel 33.0÷36.0; niobium 0.90÷1.35; vanadium 0.005÷0.20; titanium 0.005÷0.10; zirconium 0.10÷0.25; cerium 0.005÷0.10; tungsten 0.005÷0.10; sulphur ≤ 0.025; phosphorus ≤ 0.025; lead ≤ 0.007; tin ≤ 0.007; arsenic ≤ 0.007; zinc ≤ 0.007; antimony ≤ 0.007; nitrogen ≤ 0.01; molybdenum ≤ 0.2; copper ≤ 0.2; iron the rest at maintaining the following conditions, at wt %: Ni + 32×C + 0.6×Mn + Cu= 38.63 ÷ 41.40; Cr + 3×Ti + V + Mo + 1.6×Si + 0.6×Nb + W = 22.55 ÷ 25.13. 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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