Complete specifications for Inconel 825, a nickel-iron-chromium-molybdenum-copper alloy with excellent resistance to stress corrosion cracking and reducing acids.
Alloy 825 is a Ni-Cr-Fe-Mo-Cu alloy with excellent resistance to stress corrosion cracking, and good pitting resistance in all environments except strongly oxidizing chloride solutions. The alloy is ductile and easily worked and fabricated.
The alloy cannot be hardened by heat-treatment, but enhanced mechanical properties can be obtained by cold working. It's especially effective in sour well tubing strings, heat-exchangers, and chemical processing plants.
| Element | Min % | Max % |
|---|---|---|
| C | - | 0.05 |
| Si | - | 0.50 |
| Mn | - | 1.00 |
| P | - | 0.030 |
| S | - | 0.015 |
| Cr | 19.50 | 23.50 |
| Ni | 38.00 | 46.00 |
| Mo | 2.50 | 3.50 |
| Cu | 1.50 | 3.00 |
| Ti | 0.60 | 1.20 |
| Al | - | 0.20 |
| Fe | 22.00 | Balance |
Outstanding resistance to stress corrosion cracking and reducing acids
Excellent resistance to sulfidic environments and chloride stress corrosion
Superior resistance to steam-side oxidation and water-side corrosion
Higher temperature capability but lower copper content than 825
Age-hardenable with higher strength but similar corrosion resistance
Similar composition with age hardening capability for higher strength
Superior chemical resistance but higher cost than 825
Complete chemical composition, mechanical properties, and fabrication guidelines
Official ASTM specifications for Inconel 825 plate, sheet, strip, and forgings
Application guide for Inconel 825 in chemical processing environments
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