US 2025/0215536 A1 · ALLOY MATERIAL

Abstract

An alloy material that has excellent intergranular corrosion resistance is provided. An alloy material according to the present disclosure has a chemical composition containing, in mass %, C: 0.005 to 0.020%, Si: 0.05 to 0.50%, Mn: 0.05 to 1.00%, P: 0.030% or less, S: 0.0100% or less, Cu: 1.5 to 3.0%, Ni: 35.0 to 50.0%, Cr: 20.0 to 30.0%, Mo: 2.5 to 4.0%, Co: 0.01 to 0.80%, W: 0.01 to 0.30%, Ca: 0.0050% or less, N: 0.001 to 0.015%, Al: 0.20% or less, B: 0.0030% or less, Sn: 0.050% or less, and Ti: 0.40 to 0.90%, with the balance being Fe and impurities, in which the total content of Ti, Nb, V, Zr, Hf, and Ta is 0.420 to 1.000%. The number density of fine nitrogen-containing precipitates at grain boundaries of the alloy material is 20 /μm or less.

Claims4

Dependent claims

An alloy material having a chemical composition consisting of, in mass %,

C:
0.005 to 0.020%,
Si:
0.05 to 0.50%,
Mn:
0.05 to 1.00%,
P:
0.030% or less,
S:
0.0100% or less,
Cu:
1.5 to 3.0%,
Ni:
35.0 to 50.0%,
Cr:
20.0 to 30.0%,
Mo:
2.5 to 4.0%,
Co:
0.01 to 0.80%,
W:
0.01 to 0.30%,
Ca:
0.0050% or less,
N:
0.001 to 0.015%,
Al:
0.20% or less,
B:
0.0030% or less,
Sn:
0.050% or less,
Ti:
0.40 to 0.90%,
Nb:
0 to 0.150%,
V:
0 to 0.150%,
Zr:
0 to 0.150%,
Hf:
0 to 0.150%, and
Ta:
0 to 0.150%,
with the balance being Fe and impurities,
wherein:
a total content of Ti, Nb, V, Zr, Hf, and Ta is 0.420 to 1.000%, and
a number density of nitrogen-containing precipitates having a major axis of 10 to 100 nm at grain boundaries of the alloy material is 20 /μm or less.

45 more elements

Dependencies are inferred from the claim text.

Alloy material

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Alloy material

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Abstract

Claims4