| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a γ' precipitation-hardening type Ni-based superalloy with low thermal expansion, which has a coefficient of thermal expansion equal to that of a ferrite-based 12Cr steel, has excellent hot workability in addition to high-temperature strength, corrosion resistance and oxidation resistance, and has excellent weldability. <P>SOLUTION: The Ni-based superalloy with low thermal expansion has a composition comprising, by mass%, 0.15% or less C, 1% or less Si, 1% or less Mn, 5 to less than 20% Cr, 5 to less than 20% Mo+1/2(W+Re) in total, 10% or less W, 0.1 to 2.5% Al, 0.10 to 0.95% Ti, 1.5% or less Nb+1/2Ta in total, 0.001 to 0.02% B, 0.001 to 0.2% Zr, 4.0% or less Fe, 2.0 to 6.5% (atom%) Al+Ti+Nb+Ta in total, and the balance unavoidable impurities with Ni. <P>COPYRIGHT: (C)2008,JPO&INPIT |
