Highly heat-resistant nickel-based alloy and its use

Details Highly heat-resistant nickel-based alloy and its use Highly heat-resistant nickel-based alloy and its use

C - Chemistry, Metallurgy

22

C

C22C 19/05 (2006.01) B22D 17/20 (2006.01) F01D 5/28 (2006.01) F27D 3/02 (2006.01)

Patent

CA 2186842

A highly heat and oxidation-resistant hot- and cold-formable nickel-based alloy with a massive nitrogen content, for the production of objects which must be resistant against oxidation and carbonisation at temperatures in the range of 750 to 1,200°C, even under cyclic exposures, consisting (in mass %) of 0.001 to 0.15% carbon, 0.10 to 3.0% silicon, max. 0.5% manganese, max. 0.015% phosphorus, max. 0.005% sulphur, 28 to 33% chromium, max. 2.0% iron, max. 0.3% aluminium, 0.25 to 1.2% nitrogen, 0.001 to 0.01%; boron, 0.01 to 0.5% yttrium, cerium, lanthanum, zirconium, hafnium and tantalum alone or in combination, the remainder being constituted of nickel and the usual admixtures from the smelting process, with the nickel content being a least 64.0%. The invention also concerns the use of this alloy as a material for objects such as gas turbines, furnace components and heat conductors.

L'invention concerne un alliage à base de nickel à haute résistance à la chaleur et à l'oxydation, formable à chaud et à froid, à teneur élevée en azote, comprenant (en % en masse): 0,001 à 0, 15 % de carbone, 0,10 à 3,0 % de silicium, 0,5 % max. de manganèse, 0,015 % max. de phosphore, 0,005 % max. de soufre, 25 à 35 % de chrome, 5,0 % max. de fer, 0,3 % max. d'aluminium, 0,25 à 1,2 % d'azote, 0,001 à 0,01 % de bore, 0,01 à 0,5 % d'yttrium, cérium, lanthane, zirconium, hafnium et tantale, pris isolément ou en combinaison, le reste étant constitué par du nickel et par des substances résultant du processus de production, la proportion en nickel s'élevant au moins à 64,0 %. L'invention concerne également l'utilisation de cet alliage comme matériau pour des éléments qui doivent résister à l'oxydation et à la carburation à des températures de l'ordre de 750 à 1200 ~C, comme c'est le cas, par exemple, pour des turbines à gaz, des composants de fours et des conducteurs chauffants.

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