What is the difference between hastelloy C22 and C276

Hastelloy C22 and C276 are both nickel-based alloys known for their excellent corrosion resistance in a wide range of aggressive environments. The main differences between the two are as follows:

1. Composition: Hastelloy C22 has a higher chromium content compared to Hastelloy C276. Hastelloy C22 contains 22% chromium, while Hastelloy C276 contains 16-18% chromium. Additionally, Hastelloy C22 has a higher molybdenum and tungsten content compared to C276.

2. Corrosion Resistance: Both alloys offer exceptional corrosion resistance in various acidic and oxidizing environments. However, Hastelloy C22 is known for its superior resistance to crevice corrosion, pitting, and stress-corrosion cracking compared to C276.

3. Temperature Resistance: Hastelloy C276 offers better overall resistance to high-temperature oxidation compared to Hastelloy C22. C276 is suitable for use in higher-temperature applications where C22 may not be as effective.

4. Fabrication and Weldability: Hastelloy C276 is generally easier to fabricate and weld compared to Hastelloy C22, making it more cost-effective in terms of processing. In summary, Hastelloy C22 is preferred for its superior resistance to localized corrosion, while Hastelloy C276 may be more suitable for high-temperature applications and ease of fabrication. Your selection between the two will depend on the specific requirements of your application.