| Feature | Hastelloy C-22 | Hastelloy C-276 |
|---|---|---|
| Chemical Composition | Higher Chromium (20–22%) and Tungsten (2.5–3.5%) | Lower Chromium (14.5–16.5%) and no Tungsten |
| Corrosion Resistance | Superior resistance to oxidizing and reducing agents, especially in mixed environments | Excellent general corrosion resistance, strong against pitting and crevice corrosion, but less resistant to strong oxidizers compared to C-22 |
| Applications | More aggressive chemical environments, including strong oxidizers and mixed acid conditions | Broad chemical processing, especially reducing environments and chloride corrosion |
| High-Temperature Performance | Excellent oxidation and carburization resistance at elevated temperatures | Good high-temperature strength and corrosion resistance but slightly less than C-22 |
| Typical Uses | Chemical reactors, heat exchangers, pollution control, nuclear and aerospace components | Chemical processing, pollution control, flue gas scrubbers, waste treatment |
| Weldability & Fabrication | Good weldability; can be more challenging due to tungsten content | Very good weldability and fabricability |
Summary:
C-22 is generally chosen for the most aggressive, mixed acid and oxidizing environments due to its higher Cr and W content.
C-276 is widely used for general corrosion resistance and is more economical for less severe conditions.
