Alloy 825 (UNS N08825) is an austenitic nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. It was developed to provide exceptional corrosion resistance in both oxidizing and reducing environments. The alloy is resistant to chloride stress-corrosion cracking and pitting. The addition of titanium stabilizes Alloy 825 against sensitization in the as-welded condition making the alloy resistant to intergranular attack after exposure to temperatures in a range that would sensitize unstabilized stainless steels. The fabrication of Alloy 825 is typical of nickel-base alloys, with material being readily formable and weldable by a variety of techniques
Available tube product forms
Typical Applications
- Condensers
- Oil and gas well equipment
- Hydraulic systems
- Chemical injection lines
- Chemical process equipment and vessels
- Downhole control lines
- Control and instrumentation
- Acid Production
- Nuclear fuel processing
Typical manufacturing specifications
- ASTM B626
- ASTM B423
- ASTM B704
- Also individual customer specifications.
Industries predominantly using this grade
Technical Data
Mechanical Properties
| Temper |
Annealed |
| Tensile Rm |
85 |
ksi (min) |
| Tensile Rm |
590 |
MPa (min) |
| R.p. 0.2% Yield |
35 |
ksi (min) |
| R.p. 0.2% Yield |
240 |
MPa (min) |
| Elongation (2” or 4D gl) |
30 |
% (min) |
Physical Properties (Room Temperature)
| Specific Heat (0-100°C) |
440 |
J.kg-1.°K-1 |
| Thermal Conductivity |
11.1 |
W.m -1.°K-1 |
| Thermal Expansion |
14 |
μm/μm/°C |
| Modulus Elasticity |
196 |
GPa |
| Electrical Resistivity |
1.13 |
μohm/cm |
| Density |
8.13 |
g/cm3 |
Chemical Composition (% by weight)
| Element |
Min |
Max |
| C |
- |
0.05 |
| Si |
- |
0.5 |
| Mn |
- |
1 |
| P |
- |
0.03 |
| S |
- |
0.03 |
| Al |
- |
0.2 |
| Cr |
19.5 |
23.5 |
| Cu |
1.5 |
3 |
| Fe |
Balance |
| Mo |
2.5 |
3.5 |
| N |
0.15 |
0.25 |
| Ni |
38 |
46 |
| Ti |
0.60 |
1.20 |