Here's a clear comparison between Hastelloy C-22 and Stainless Steel 316:
| Aspect | Hastelloy C-22 | Stainless Steel 316 |
|---|---|---|
| Material Type | Nickel-based superalloy | Austenitic stainless steel |
| Corrosion Resistance | Excellent resistance to highly oxidizing and reducing environments, including strong acids, chlorides, and mixed acid media | Good resistance to general corrosion, pitting, and crevice corrosion, especially in chloride environments, but less resistant than C-22 to strong oxidizers |
| Temperature Resistance | Maintains strength and corrosion resistance at elevated temperatures (up to ~1200°F/650°C) | Good resistance up to about 870°F (465°C) but less suitable for extreme temperatures |
| Mechanical Strength | Higher strength and creep resistance at high temperatures | Moderate strength, suitable for many structural applications |
| Applications | Severe chemical processing, nuclear, aerospace, pollution control, and highly corrosive environments | Food processing, pharmaceuticals, marine environments, chemical tanks, and piping |
| Cost | Significantly more expensive due to alloying and performance | More economical and widely used for less aggressive environments |
| Weldability | Good but requires care due to alloy complexity | Excellent weldability and fabrication ease |
Summary:
Use Hastelloy C-22 for extreme corrosion resistance in highly aggressive chemical and high-temperature environments.
Use 316 Stainless Steel for general corrosion resistance in moderate environments with chlorides and moderate temperatures.
If you want detailed mechanical properties or cost analysis, just ask!
