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, but work hardens in a similar manner to austenitic stainless steels.
The alloy cannot be hardened by heat-treatment, but enhanced mechanical properties can be obtained by cold working, especially in sour well tubing strings, and for heat-exchangers, and in chemical processing plants.
| C | Si | Mn | P | S | Cr | Ni | Mo | Cu | Ti | Al | Fe | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | - | - | - | - | - | 19.50 | 38.00 | 2.50 | 1.50 | 0.60 | - | 22.00 |
| Max | 0.05 | 0.50 | 1.00 | 0.030 | 0.015 | 23.50 | 46.00 | 3.50 | 3.00 | 1.20 | 0.20 | - |
| Property | Value |
|---|---|
| U.T.S | 85 KSI Min (586 N/mm2) |
| 0.2% Proof Stress | 35 KSI Min (241 N/mm2) |
| Elongation | 30% |