| Feature | Incoloy 800 | Incoloy 825 |
|---|---|---|
| Composition | Ni-Fe-Cr alloy (Ni 30-35%, Cr 19-23%) | Ni-Fe-Cr alloy with Mo and Cu additions (Ni 38-46%, Cr 19.5-23.5%, Mo 2.5-3.5%, Cu 1.5-3.0%) |
| Corrosion Resistance | Good resistance to oxidation, carburization, and mild corrosive environments | Superior resistance to reducing acids, stress corrosion cracking, and pitting corrosion |
| Typical Applications | High-temp furnace parts, heat exchangers, petrochemical processing | Chemical processing, acid environments, marine, nuclear reactors |
| Mechanical Strength | Good high-temp strength and oxidation resistance | Similar or slightly lower high-temp strength, but better corrosion resistance |
| Max Service Temperature | Up to ~1100°C (2010°F) | Up to ~980°C (1800°F) |
| Common Uses | Heat treatment baskets, gas turbines, reformers | Acidic environments, seawater, sulfuric/nitric acid handling |
Summary
Incoloy 800 excels in high temperature strength and oxidation resistance.
Incoloy 825 is preferred where corrosion resistance to acidic and reducing environments is critical.
