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

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely to compositions of heat-resistant alloys used for manufacture of reaction pipes in plants for production of hydrogen, methanol, ammonia, and other oil-and-gas processing plants with working conditions at temperatures from plus 750 °C to plus 1,000 °C, and pressures up to 50 atm. Alloy contains following component ratio, wt.%: carbon 0.35-0.45, chromium 24.0-27.0, nickel 18.0-21.0, silicon 0.9995-1.59, manganese 1.0005-1.51, vanadium 0.0005-0.20, titanium 0.0005-0.10, aluminium 0.0005-0.10, sulphur ≤ 0.03, phosphorus ≤ 0.03, lead ≤ 0.009, tin ≤ 0.009, arsenic ≤ 0.009, zinc ≤ 0.009, molybdenum ≤ 0.5, copper ≤ 0.2, yttrium > 0-0,001, antimony ≤ 0.009, oxygen > 0.0005-0.028, hydrogen > 0.0005-0.0025, nitrogen > 0.0005-0.095, iron - the rest. For alloy components following condition applies, wt.%: (Cr_Eq/Ni_Eq) ≥ 0.796, where Cr_Eq is chromium equivalent, Ni_Eq is nickel equivalent, Cr_Eq = Cr+2×Al+3×Ti+V+Mo+1.6×Si, 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 work are provided.

2 cl