Incoloy 825 (UNS N08825)
Introduction of Incoloy 825 Alloy
Incoloy 825 (UNS N08825, Alloy 825) is a nickel-iron-chromium alloy with added molybdenum and copper, designed for outstanding corrosion resistance in reducing, oxidizing, and high temperature environments.
It is widely used in chemical processing, oil & gas, pollution control, and heat exchanger applications requiring stress corrosion cracking resistance and superior performance in aggressive environments.
Chemical Composition (%)
| Nickel (Ni) | 38–46 |
| Iron (Fe) | Balance |
| Chromium (Cr) | 19–23 |
| Molybdenum (Mo) | 2–3 |
| Copper (Cu) | 1–2 |
| Carbon (C) | ≤0.05 |
| Manganese (Mn) | ≤1 |
| Silicon (Si) | ≤1 |
| Sulfur (S) | ≤0.03 |
| Cobalt (Co) | ≤1 |
Mechanical Properties
| Tensile Strength | ≥585 MPa |
| Yield Strength | ≥205 MPa |
| Elongation | ≥30% |
| Hardness | ≤180 HB |
| Condition | Annealed |
Physical Properties
| Density | 8.0 g/cm³ |
| Melting Range | 1350–1400°C |
| Thermal Conductivity | 11 W/m·K |
| Electrical Resistivity | 0.9 μΩ·m |
| Elastic Modulus | 190 GPa |
Product Forms & Standards
| Seamless Pipe | ASTM B423 |
| Welded Pipe | ASTM B705 |
| Seamless Tube | ASTM B423 |
| Heat Exchanger Tube | ASTM B163 |
| Welded Tube | ASTM B704 |
| Plate / Sheet / Strip | ASTM B424 |
| Bar / Rod | ASTM B425 |
| Forgings | ASTM B564 |
| Pipe Fittings | ASTM B366 |
| Flanges | ASTM B564 |
Key Features of Incoloy 825
Excellent Corrosion Resistance
Strong resistance to oxidizing and reducing acids, seawater, and polluted environments.
High Temperature Strength
Maintains mechanical properties at elevated temperatures up to 650°C.
Stress Corrosion Cracking Resistant
Resists chloride stress corrosion cracking in harsh environments.
Fabricability
Good weldability and machinability for industrial fabrication.
Typical Applications of Alloy 825 Products
Chemical Processing
Acid handling equipment and process systems.
Oil & Gas
Offshore piping and downhole systems.
Pollution Control
FGD systems and waste treatment plants.
Available Incoloy 825 Products
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