US 2014/0234155 A1 · Ni-BASED HEAT RESISTANT ALLOY

Abstract

A Ni-based heat resistant alloy as pipe, plate, rod, forgings and the like consists of C≦0.15%, Si≦2%, Mn≦3%, P≦0.03%, S≦0.01%, Cr: 15% or more and less than 28%, Mo: 3 to 15%, Co: more than 5% and not more than 25%, Al: 0.2 to 2%, Ti: 0.2% to 3%, Nd: fn to 0.08%, and O≦0.4Nd, further containing, as necessary, at least one kind of Nb, W, B, Zr, Hf, Mg, Ca, Y, La, Ce, Ta, Re and Fe of specific amounts, the balance being Ni and impurities, wherein, fn=1.7×10−5d+0.05{(Al/26.98)+(Ti/47.88)+(Nb/92.91)}. In the formula, d denotes an average grain size (μm), and each element symbol denotes the content (mass %) of that element. If the alloy contains W, Mo+(W/2)≦15% holds. The alloy has improved ductility after long-term use at high temperatures, and cracking due to welding can be avoided.

Claims4

Dependent claims

A Ni-based heat resistant alloy consisting, in mass percent, of C:

0.15% or less, Si:
2% or less, Mn:
3% or less, P:
0.03% or less, S:
0.01% or less, Cr:
15% or more and less than 28%, Mo:
3 to 15%, Co:
more than 5% and not more than 25%, Al:
0.2 to 2%, Ti:
0.2% to 3%, Nd:
f1 to 0.08%, and O:
0.4Nd or less, the balance being Ni and impurities, wherein the f1 refers to the following formula, and in the formula, d denotes an average grain size (μm), and each symbol of an element denotes the content (mass %) of that element, and likewise, Nd in 0.4Nd denotes the content (mass %) of Nd.
f1=1.7×10−5d+0.05{(Al/26.98)+(Ti/47.88)}

10 more elements

Dependencies are inferred from the claim text.

Ni-BASED HEAT RESISTANT ALLOY

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Ni-BASED HEAT RESISTANT ALLOY

Life of this patent

Abstract

Claims4