| Feature | Incoloy 825 | SS316 |
|---|---|---|
| Composition | 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%) | Iron-based alloy with Cr (16-18%), Ni (10-14%), Mo (2-3%) |
| Corrosion Resistance | Superior resistance to strong acids (HCl, H2SO4), excellent against pitting and crevice corrosion | Good corrosion resistance in most environments, moderate resistance to acids and chlorides |
| Temperature Range | Good strength and corrosion resistance from -196°C to 550°C | Good up to about 870°C, but less resistant to strong acids at high temps |
| Mechanical Strength | Higher strength and toughness, especially at elevated temperatures | Good strength but generally lower than Incoloy 825 |
| Applications | Chemical processing, acid handling, pollution control, aerospace, marine | Food processing, pharmaceuticals, marine, general corrosion resistant applications |
| Cost | Generally more expensive due to higher Ni, Mo, and Cu content | More economical and widely used stainless steel grade |
Summary:
Incoloy 825 is preferred for highly corrosive acid environments and high temperature, high strength needs, while SS316 is a versatile stainless steel suitable for general corrosion resistance and moderate environments.
