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

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, particularly compositions of heat-resistant alloys used for manufacture reservoirs and reaction pipes in oil-and-gas processing plants with working conditions at temperatures from plus 700 °C to plus 980 °C, and pressures up to 46 atm. Alloy contains following component ratio, wt.%: carbon 0.08-0.14, chromium 19.0-21.0, nickel 31.0-34.0, niobium 0.90-1.35, silicon 0.0005-0.79, manganese 0.5005-1.21, 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, sulfur ≤ 0.03, phosphorus ≤ 0.03, lead ≤ 0.009, tin ≤ 0.009, arsenic ≤ 0.009, zinc ≤ 0.009, antimony ≤ 0.009, molybdenum ≤ 0.5, copper ≤ 0.2, iron - the rest. For alloy components following condition applies, wt.%: (Cr_Eq/Ni_Eq)≥0.585, where Cr_Eq is chromium equivalent, Ni_Eq is nickel equivalent, Cr_Eq = Cr+2×Al+3×Ti+V+Mo+1.6×Si+0.6×Nb, Ni_Eq = Ni+32×C+0.6×Mn+22×N+Cu.

EFFECT: higher structural stability of alloy during ageing, as well as reduced tendency to hot cracks during welding are provided.

2 cl