HIGH-TEMPERATURE ALLOY Russian patent published in 1999 - IPC

FIELD: metallurgy, in particular, high-temperature alloys used in manufacture of reaction pipes of plants for production of ethylene, hydrogen, ammonium, carbon disulfide, methanol, etc. SUBSTANCE: alloy contains, wt.%: carbon, not more 0.60; silicon, not more 2.75; manganese, not more 2.00; chromium, 16.0-29.0; nickel, 8.0-50.0; tungsten, not more 6.0; niobium, not more 2.0; cerium, not more 0.2; copper, not more 1.1; molybdenum, not more 0.6; nitrogen, not more 0.06; titanium, not more 0.6; boron, not more 0.006; aluminum, not more 1.0; vanadium, not more 0.2; magnesium, not more 0.15; zirconium, not more 0.20; yttrium, not more 0.15; beryllium, not more 0.20; barium, not more, 0.005; calcium, not more 0.01; cobalt, not more 16.0; iron, the balance. In this case sum of chromium + nickel + cobalt must not be not less 24.01%, but not more, 81.1%. EFFECT: prolonged service life of pipes made from the offered alloy due to improvement of stability of properties after ageing and higher corrosion resistance, heat resistance and high-temperature strength. 3 tbl