Anti-Corrosion Alloy
Description:
Alloy 31 / N08031 / NS144 / 1.4562
Alloy 31 is an iron-nickel-chromium-molybdenum alloy with nitrogen addition. It has a pitting resistance in high chloride environments between those of super-austenitic stainless steels and nickel alloys. The alloy has very good corrosion resistance in mixed acid and high chloride environments. The material is approved in ISO 15156/ NACE MR0175 to test level VI for sour gas service.
Alloy 31 Mechanical Properties:
Temper
Annealed
Tensile Rm
94
ksi (min)
Tensile Rm
650
MPa (min)
R.p. 0.2% Yield
41
ksi (min)
R.p. 0.2% Yield
280
MPa (min)
Elongation (2.02 or 4D gl)
40
% (min)
Alloy 31 Chemical Composition (% by weight):
Element
Min
Max
C
-
0.0015
Si
-
0.3
Mn
-
2
P
-
0.02
S
-
0.01
Cr
26
28
Cu
1
1.4
Fe
Balance
Mo
6
7
N
0.15
0.25
Ni
30
32