Patent ID: 7160400

Claim:
A low thermal expansion Ni-base superalloy comprising, by weight % (hereinafter the same as long as not particularly defined), C: 0.15% or less; Si: 1% or less; Mn: 1% or less; Mo: 17.01 to 25%; Cr: 5 to 15%; at least one of Mo, W and Re of Mo+½(W+Re) of 17.39 to 25%; Al: 0.2 to 2%; Ti: 0.5 to 4.5%; Fe of 10% or less; at least one of B: 0.02% and Zr: 0.2% or less; a remainder of Ni and inevitable impurities; wherein the atomic % of Al+Ti is 2.5 to 7.0; wherein the low thermal expansion Ni base superalloy contains both γ′ phase precipitate consisting of intermetallic compound Ni 3 Al, Ni 3 (Al, Ti) or Ni 3 (Al, Ti, Nb, Ta) and A 2 B phase precipitate consisting of intermetallic compound Ni 2 (Mo, Cr).