Alloy 825
- ALLOY 825 • UNS N08825 • WNR 2.4858
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 form
- Straight
- Coiled
- Seamless
- Seam welded and cold redrawn
- Seam welded, cold redrawn and annealed
- 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
- Industries predominantly using this Grade
- Chemical processing
- Oil and gas
- Nuclear and Power
- Typical Manufacturing Specifications
- ASTM B626
- ASTM B423
- ASTM B704
- Also Individual Customer Specifications.
- 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 | Ohm-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 |
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