Patent ID: 8491838
Filing Date: 2013-07-23
Classification: C22C

Abstract:
1. A low thermal expansion Ni-base superalloy comprising, in terms of mass %, C: 0.15% or less; Si: 1% or less; Mn: 1% or less; Cr: 8.5% or more but less than 20%; at least two of Mo, W and Re, in which Mo+½(W+Re) is 9.1% or more but up to 16.2%; W: 10% or less; Al: 0.98% to 1.85%; Ti: 0.10 to 0.95%; Nb+½Ta: 1.5% or less; B: 0.001 to 0.02%; Zr: 0.001 to 0.2%; Fe: 4.0% or less; and a balance of inevitable impurities and Ni, wherein the total amount of Al, Ti, Nb and Ta is 2.0 to 6.5% in terms of atomic %.