Alloy 825 is an austenitic nickel-iron-chromium-molybdenum-copper alloy containing high levels of chromium, nickel, molybdenum and copper to provide high levels of corrosion resistance to both moderately oxidizing and moderately reducing environments. The alloy has a high level of nickel, which in combination with the level of molybdenum and copper, produces substantially improved corrosion resistance in reducing environments compared to the standard stainless steels.
The nickel content is sufficiently high to provide superb resistance to chloride stress corrosion cracking. The chromium and molybdenum content of the alloy provides a level of resistance to chloride ion pitting. In addition, the alloy is stabilized against sensitization in the welded condition by the addition of a specified level of titanium. Because of this stabilization, the material is resistant to intergranular attack after exposure in the temperature range, which would sensitize unstabilized stainless steels.
Alloy 825 has a long history of use in many corrosive environments and has been incorporated in ASTM and ASME specifications for many years. As an austenitic, nickel-base alloy, the material is ductile over a wide range of temperatures from cryogenic to well in excess of 1000°F (538°C).
Nickel Alloy 825 Chemical Composition
Chemical Composition (wt%) limits as specified in ASTM B425*
| Carbon | 0.05 | Manganese | 1.0 |
| Chromium | 19.5-23.5 | Silicon | 0.5 |
| Nickel | 38.0-46.0 | Copper | 1.5-3.0 |
| Iron | 22.0 min | Aluminum | 0.1-0.5 |
| Molybdenum | 2.5-3.5 | Sulfur | 0.03 |
| Titanium | 0.6-1.2 |
*Maximum, unless range is indicated
Nickel Alloy 825 Physical Properties
| Density, lb/in3 | 0.293 |
| Modulus of Elasticity, psi | 28.3 x 106 |
| Coefficient of Thermal Expansion, 68-212˚F, /˚F | 7.7 x 10-6 |
| Thermal Conductivity, Btu/ft hr ˚F | 6.4 |
| Specific Heat, Btu/lb ˚F | 0.12 |
| Electrical Resistivity, Microhm-in | 44.5 |
Nickel Alloy 825 Mechanical Properties
Mechanical property requirements as specified for annealed product in ASTM B425
| Yield Strength, min. (ksi) | 35 |
| Tensile Strength, min. (ksi) | 85 |
| Elongation, min. (%) | 30 |
Nickel Alloy 825 Standards
| ASTM B425 |
| ASTME SB425 |
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Data shown are typical and provided for informational purposes only. Values should not be considered minimums or maximums for specification or final design. Actual product data may vary, and information may be revised without notice.