US 2019/0100826 A1 · Ni-Fe-Cr Alloy

Abstract

An objective of the present invention is to provide a Ni—Fe—Cr alloy having an excellent intergranular corrosion resistance. A Ni—Fe—Cr alloy of the present embodiment has a chemical composition consisting of, in mass percent, C: 0.005 to 0.015%, Si: 0.05 to 0.50%, Mn: 0.05 to 1.5%, P: 0.030% or less, S: 0.020% or less, Cu: 1.0 to 5.0%, Ni: 30.0 to 45.0%, Cr: 18.0 to 30.0%, Mo: 2.0 to 4.5%, Ti: 0.5 to 2.0%, N: 0.001 to 0.015%, and Al: 0 to 0.50%, with the balance being Fe and impurities. An average grain size d (μm) satisfies Formula (1): d<4.386/(Crel+0.15) (1) where, Crel in Formula (1) is defined by Formula (2): Crel=C−0.125Ti+0.8571N (2) where, symbols of elements in Formula (1) and Formula (2) are to be substituted by contents of corresponding elements (mass %).

Claims2

Dependent claims

A Ni—Fe—Cr alloy comprising a chemical composition consisting of, in mass percent:

C:
0.005 to 0.015%;
Si:
0.05 to 0.50%;
Mn:
0.05 to 1.5%;
P:
0.030% or less;
S:
0.020% or less;
Cu:
1.0 to 5.0%;
Ni:
30.0 to 45.0%;
Cr:
18.0 to 30.0%;
Mo:
2.0 to 4.5%;
Ti:
0.5 to 2.0%;
N:
0.001 to 0.015%;
and
Al:
0 to 0.50%, with the balance being Fe and impurities, wherein an average grain size d (μm) satisfies Formula (1):
d<4.386/(Crel+0.15) (1)
where, Crel in Formula (1) is defined by Formula (2):
Crel=C−0.125Ti+0.8571N (2)
where, symbols of elements in Formula (1) and Formula (2) are to be substituted by contents of corresponding elements (mass %).

26 more elements

Dependencies are inferred from the claim text.

Ni-Fe-Cr Alloy

Life of this patent

Ni-Fe-Cr Alloy

Life of this patent

Abstract

Claims2