HASTELLOY Alloy C-22 is a nickel-chromium-molybdenum alloy with enhanced resistance to pitting, crevice corrosion, and stress corrosion cracking. This alloy resists the formation of grain boundary precipitates in the weld-heat affected zone, making it suitable for use in the as-welded condition.

C-22 demonstrates outstanding resistance to both reducing and oxidizing media, making it ideal for applications where "upset" conditions are likely to occur. The alloy has proven excellent weldability and high corrosion resistance as consumable filler wires and electrodes, serving effectively as filler wire in applications where other corrosion-resistant wires have failed.

Due to its ductility, C-22 can be easily cold-worked, with cold-forming being the preferred method of forming. The alloy requires more energy during forming as it is generally stiffer than austenitic stainless steels. A 0.28" thick sheet in the heat-treated at 2050°F, rapid quenched condition, achieves an average olsen cup depth of 0.49".

Nickel and cobalt base corrosion, temperature, and wear-resistant alloys are classified as moderate to difficult when machining. However, these alloys can be machined using conventional production methods at satisfactory rates. Key considerations during machining operations include:

• Capacity - Machines should be rigid and overpowered as much as possible
• Rigidity - Work piece and tool should be held rigid with minimized tool overhang
• Tool Sharpness - Maintain sharp tools at all times; a 0.015 inch wear land is considered a dull tool
• Tools - Use positive rake angle tools for most operations; carbide-tipped tools are suggested for most applications
• Positive Cuts - Use heavy, constant feeds to maintain positive cutting action and prevent work hardening
• Lubrication - Soluble oils are recommended, especially when using carbide tooling