Alloy 625 is a Nickel - Chromium alloy with additions of Niobium (Columbium) and Molybdenum.
It has good stress-rupture strength up to 980°C (1800°F), resists oxidation and exhibits good resistance against chloride-ion stress corrosion cracking and crevice corrosion. It also has excellent fatigue strength and cryogenic properties.
It has widely used applications in marine and chemical processing environments, in forms such as seals, fasteners, heat exchangers, valves, steam lines, exhaust ducts, etc. It is also used as a weld overlay for corrosion resistance purposes.
| C | Si | Mn | P | S | Cr | Ni | Mo | Nb/Cb+Ta | Ti | Al | Fe | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | - | - | - | - | - | 20.00 | 58.00 | 8.00 | 3.15 | - | - | - |
| Max | 0.10 | 0.50 | 0.50 | 0.015 | 0.015 | 23.00 | 63.00 | 10.00 | 4.15 | 0.40 | 0.40 | 5.00 |
| Property | Value |
|---|---|
| U.T.S | 120 KSI Min (827 N/mm2) |
| 0.2% Proof Stress | 60 KSI Min (414 N/mm2) |
| Elongation | 20% |
| Red of Area | 35% |
| CVN Impacts @ -40°C (-40°F) | 27 Joules (20 ft-lbf) |