HIGH-TEMPERATURE ALLOY Russian patent published in 2016 - IPC C22C30/00 C22C38/60 C22C38/58 C22C38/50 

FIELD: metallurgy.

SUBSTANCE: invention relates to composition of refractory alloy used for production of reaction tubes gas processing plants with working modes at a temperature of 700÷1050°C and pressure of up to 46 ATM. Alloy contains the following component ratio, wt%: carbon 0.35-0.45, chrome 24.0-27.0, nickel 18.0-21.0, niobium 1.1-1.6, silicon 1.8995-2.49, manganese 1.0005-1.51, vanadium 0.0005-0.20, titanium 0.0005-0.1, aluminium 0.0005-0.1, yttrium >0-0.001, oxygen >0.0005-0.028, hydrogen >0.0005-0.0025, nitrogen >0.0005-0.095, sulphur ≤0.02, phosphorus ≤0.03, lead ≤0.009, stannum ≤0.009, arsenic ≤0.009, zinc ≤0.009, antimony ≤0.009, molybdenum ≤0.2, copper ≤0.1, iron - the rest. For the alloy components the following conditions, wt%: (Cr_e/Ni_e)≥0.85, where Cr_e - equivalent of chromium, Ni_e -equivalent of nickel, Cr_e= Cr+2×Al+3×Ti+V+Mo+1.6×Si+0.6×Nb, Ni_e=Ni+32×C+0.6×Mn +22×N+Cu.

EFFECT: reduced is anisomerousness of alloy structure, increased structural stability of the alloy in the process of ageing, as well as reduced susceptibility to formation of hot cracks during welding.

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