HIGH-TEMPERATURE ALLOY Russian patent published in 2016 - IPC C22C30/00 C22C19/05 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely to heat-resistant alloys, and can be used for making reservoirs and reaction tubes gas processing plants with working conditions at temperature from plus 1000°C to plus 1200°C and pressure of up to 46 atm. Heat resistant alloy contains, wt%: carbon 0.45÷0.55; chromium 25.0÷28.0; nickel 34.0÷37.0; tungsten 4.50÷5.50; cobalt 14.0÷16.0; silicon 1.1995÷1.59; manganese 0.0005÷1.25, vanadium 0.0005÷0.20; titanium 0.0005÷0.10; aluminium 0.0005÷0.10; yttrium > 0÷0.001; oxygen > 0.0005÷0.028; hydrogen > 0.0005÷0.0025; nitrogen > 0.0005÷0.095; sulphur ≤ 0.02; phosphorus ≤ 0.025; lead ≤ 0.009; tin ≤ 0.009; arsenic ≤ 0.009; zinc ≤ 0.009; antimony ≤ 0.009; molybdenum ≤ 0.5; copper ≤0.2; iron is rest. Following conditions are met, wt %: (Cr_E/Ni_E) ≥ 0.506, where: Cr_E is chromium equivalent; Ni_E is nickel equivalent; Cr_E=Cr+2×Al+3×Ti+V+Mo+1.6×Si+W; Ni_E = Ni+32C+0.6×Mn+Co+22×N+Cu. For content of sulphur and phosphorus condition is met of (S+P) ≤ 0.025.

EFFECT: increased structural stability of alloy in process of ageing, as well as reduced tendency to formation of hot cracks during welding.

2 cl