Nickel-base casting superalloy and cast component for stream turbine using the same as material

摘要

A Ni-base casting superalloy containing, in masse, C: 0.05 to 0.2, Si: 0.01 to 1, Mn: 0.01 to 1, Co: 5 to 20, Fe: 10 or less, Cr: 15 to 25, and one kind or two kinds or more of Mo, W, and Re, with Mo+(W+Re)/2: 8 to 25, the balance being Ni and unavoidable impurities.

主权项

1. A nickel-base casting superalloy comprising, in mass %,
nickel, carbon (C): 0.05 to 0.2, silicon (Si): 0.01 to 1, manganese (Mn): 0.01 to 1, cobalt (Co): 13 to 17, iron (Fe): 5.3 or less, chromium (Cr): 15 to 25, molybdenum (Mo): 12.8 to 17.4, and at least one of tungsten (W) and rhenium (Re), provided that the total amount of molybdenum, tungsten, and rhenium satisfies: Mo +(W +Re)/2: 20.5 to 25, and one kind or two kinds of niobium (Nb) and tantalum (Ta), with Nb +Ta/2: 1 to 5.