Patent ID: 6997994

Claim:
An Ni based alloy containing 50 to 55 wt % Ni, 17 to 21 wt % Cr, 2.8 to 3.3 wt % Mo, 4.75 to 5.5 wt % Ta and Nb in total provided that Ta does not comprise more than 0.1 wt %, 0.65 to 1.15 wt % Ti, 0.2 to 0.8 wt % Al, and Fe and unavoidable impurity as a residue; wherein said Ni based alloy includes 700 to 1,100 precipitates per μm 2 thereof when observed two-dimensionally with a transmission electron microscope an electron beam transmission thickness normalized to 10 nm, wherein said precipitates are primarily γ″ phase precipitates and each of said precipitates has a longer diameter of not less than 0.5 nm; and wherein said precipitate includes a number of large precipitates having an average diameter of between about 25 nm to 1 μm, said average diameter is defined as: (longer diameter+shorter diameter)/2.