Thermostable and corrosion-resistant cast nickel-chromium alloy

C - Chemistry – Metallurgy – 22 – C

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C22C 19/05 (2006.01) C22C 38/00 (2006.01)

Patent

CA 2513830

A nickel-chromium casting alloy comprising up to 0.8% of carbon, up to 1% of silicon, up to 0.2% of manganese, 15 to 40% of chromium, 0.5 to 13% of iron, 1.5 to 7% of aluminum, up to 2.5% of niobium, up to 1.5% of titanium, 0.01 to 0.4% of zirconium, up to 0.06% of nitrogen, up to 12% of cobalt, up to 5% of molybdenum, up to 6% of tungsten and from 0.01 to 0.1% of yttrium, remainder nickel, has a high resistance to carburization and oxidation even at temperatures of over 1130°C in a carburizing and oxidizing atmosphere, as well as a high thermal stability, in particular creep rupture strength.

La présente invention concerne un alliage nickel-chrome-fonte comprenant 0,8 % de carbone, jusqu'à 1 % de silicium, jusqu'à 0,2 % de manganèse, 15 à 40 % de chrome, 0,5 à 13 % de fer, 1,5 à 7 % d'aluminium, jusqu'à 2,5 % de niobium, jusqu'à 1,5 % de titane, 0,01 à 0,4 % de zirconium, jusqu'à 0,06 % d'azote, jusqu'à 12 % de cobalt, jusqu'à 5 % de molybdène, jusqu'à 6 % de tungstène et 0,01 à 0,1 % d'yttrium, le reste étant du nickel. Ledit alliage possède, même à des température supérieures à 1130 ·C en atmosphère de carbure ou d'oxyde, une résistance élevée à la carburation et à l'oxydation et une résistance à la chaleur élevée, notamment une résistance au fluage élevée.

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