Hastelloy is high- performance nickel alloy registered by Haynes International, Inc. The primary alloying ingredient in hastelloy is typically transition metal nickel, with various % of copper, iron, aluminium, and titanium. Common grades of Hastelloy include c276 and c22. Hastelloy is especially resistance to high temperature and high stress environments, and is a great alternative to iron-based alloy in terms of corrosion resistance. The welding characteristics of hastelloy are similar to austenitic stainless steel, and hence not very difficult to weld with proper care. The preferred method for welding hastelloy is GTAW, GMAW, and shielded metal arc welding (SWAW). Other less common welding methods are plasma arc welding, resistance spot welding, laser beam welding, electron beam welding and submerged arc welding. One of the most important issues to keep in mind when welding hastelloy is cleanliness. Contamination for greases, oil, lead sulphur and other elements with melting points lower than nickel can cause severe problems.

The corrosion – resistant hastelloy alloy are widely used by chemical processing industries. The need for reliable performance leads to their acceptance and growth in areas of geothermal, solar energy oil + gas + pharmaceutical. The benefit of hastelloy process equipment include high resistance to uniform attack outstanding localized corrosion resistance excellent stress corrosion cracking resistance and ease of welding + fabrication.

C- 276

Hastelloy versatile carrion resistance alloy. Very good resistance to reducing, and mildly oxidizing corrosives. Excellent stress corrosion resistance with good resistance to localized attack.

C- 22

Better overall corrosion resistance in oxidizing corrosive than C-4. C-276 + 625 ALLOY. Outstanding resistance to localized corrosion and excellent resistance to stress corrosion cracking. Best alloy to use as universal weld filler metal to resist corrosion of weldments.