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

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely to heat-resistant alloys used for making reservoirs and reaction tubes in oil-and-gas processing plants with working modes at temperatures of 700 to 950 °C and pressures up to 50 atm. Alloy contains following components with ratio, wt.%: carbon 0.06-0.10, chromium 19.0-23.0, nickel 30.0-34.0, silicon 0.0005-0.65, manganese 0.0005-0.74, vanadium 0.0005-0.10, tungsten 0.0005-0.10, titanium 0.25-0.60, aluminium 0.0005-0.60, 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, 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) ≥ 0.669, where Cr_Eq is chromium equivalent, Ni_Eq is nickel equivalent, Cr_Eq=Cr+2×Al+3×Ti+V+Mo+1,6×Si+W; Ni_Eq=Ni+32C+0,6×Mn+22×N+Cu.

EFFECT: higher structural stability of alloy during ageing, as well as reduced tendency to hot cracks during welding work is enabled.

2 cl