Alloy 825 (UNS N08825)
The alloy maintains good mechanical properties over a wide temperature range and is widely used in chemical processing, pollution control, nuclear fuel reprocessing, and offshore applications.
The alloy offers excellent weldability and resistance to hydrogen-induced cracking. It is commonly used in turbine components, pump shafts, valves, and offshore applications requiring high mechanical strength and reliability.
Specifications
- UNS: N08825
- ASTM: B425 (Bars), B564 (Forgings)
- EN / DIN: 2.4858
- Structure: Nickel-Iron-Chromium Alloy
- Condition Supplied: Annealed
Data Tables
Chemical Composition:
| C | Mn | P | S | Si | Cr | Ni | Ti | Mo | N | Cu | Fe | Co | Nb (+Ta) | V | W | Al | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | 19.5 | 38 | 1 | ||||||||||||||
| Max | 0.05 | 1 | 0.035 | 0.03 | 0.5 | 23.5 | 46 | 2 | Bal |
Mechanical Properties:
| Material Grade | ASTM Standard | Desgnation(EN /UNS) | Yield Strength (MPa) | Yield Strength (KSI) | Tensile Strength (MPa) | Tensile Strength (KSI) | Elongation (%) | Reduction of Area (%) | Hardness(HRC/HBWMax) | Condition | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Alloy 825 | ASTM B425 / B564 | EN 2.4858(N08825) | 241 | 34.954158 | 586 | 84.992268 | 30 | - | - | Solution Annealed |
Physical Properties:
| Material Grade | Density (g/cm³) | Melting Range (°C) | Modulus of Elasticity (GPa) | Thermal Conductivity (W/m·K) | Thermal Expansion (×10⁻⁶ /°C) | Electrical Resistivity (µΩ·m) | Magnetic Behavior |
|---|---|---|---|---|---|---|---|
| Alloy 825 | 8.14 | 1370–1400 | 196 | 11.1 | 13.6 | 1.15 | Non-magnetic |
Key Features
- Excellent resistance to oxidising and reducing acids
- Highly resistant to stress corrosion cracking
- Good resistance to pitting and crevice corrosion
- Stable mechanical properties over wide temperature range
- Good weldability and fabricability
Applications
- Chemical processing equipment
- Pollution control systems
- Acid production plants
- Nuclear fuel reprocessing
- Offshore and marine components