Alloy 625 is a nickel-chromium-molybdenum alloy used for its high strength, excellent fabricability and outstanding corrosion resistance. Service temperatures can range from cryogenic to 980°C (1800°F). Alloy 625 strength is derived from the solid solution strengthening effect of molybdenum and niobium on its nickel-chromium matrix.
Thus precipitation-hardening treatments are not required. This combination of elements also is responsible for superior resistance to a wide range of corrosive environments of unusual severity as well as to high-temperature effects such as oxidation and carburization.
Available Tube Product form
Typical Applications
Industries predominantly using this Grade
Typical Manufacturing Specifications
- ASTM B444
-
AMS 5581
-
BS 3074
-
Also individual customer specifications.
Technical Data
Mechanical Properties
|
Temper |
Annealed (Grade1) |
Solution-annealed (Grade 2) |
|
Tensile Rm |
120 |
ksi (min) |
100 |
ksi (min) |
|
Tensile Rm |
827 |
MPa (min) |
690 |
MPa (min) |
|
R.p. 0.2% Yield |
60 |
ksi (min) |
40 |
ksi (min) |
|
R.p. 0.2% Yield |
414 |
MPa (min) |
276 |
MPa (min) |
|
Elongation (2” or 4D gl) |
30 |
% (min) |
30 |
% (min) |
Physical Properties (Room Temperature)
|
Specific Heat (0-100°C) |
460 |
J.kg-1.°K-1 |
|
Thermal Conductivity |
14.8 |
W.m -1.°K-1 |
|
Thermal Expansion |
12.4 |
μm/μm/°C |
|
Modulus Elasticity |
207 |
GPa |
|
Electrical Resistivity |
10.3 |
Ohm-cm |
|
Density |
8.42 |
g/cm3 |
Chemical Composition (% by weight)
|
Element |
Min |
Max |
|
C |
- |
0.1 |
|
Si |
- |
0.5 |
|
Mn |
- |
0.5 |
|
P |
- |
0.015 |
|
S |
- |
0.015 |
|
Al |
- |
0.4 |
|
Cr |
20 |
23 |
|
Cu |
1 |
1.4 |
|
Fe |
- |
5 |
|
Mo |
8 |
10 |
|
Nb |
3.15 |
4.15 |
|
Ni |
Balance |
|
Ti |
- |
0.4 |