What is C-22?
Chemical Composition and Physical Properties

Hastelloy C-22 is a Nickel-Chromium-Molybdenum-Tungsten alloy with better overall corrosion resistance compared to any other Ni-Cr-Mo alloys such as Hastelloy C-276, C-4 and alloy 625.

C-22 is also identified by the Unified numbering system (UNS) designation N06022. UNS number N06022 incorporates Inconel Alloy 22, Inconel 622, ATI’s Alloy 22, and AL 22.

Hastelloy C22 is extremely corrosion resistant to oxidizing and reducing environment. C-22 has shown an outstanding resistance to a wide range of chemicals. It has consistently shown good results when exposed to strong oxidizers, such as ferric and cupric chlorides, chlorine, organic and inorganic hot contaminated solutions, formic and acetic acids, acetic anhydride, seawater, and brine solutions.

In addition to having exceptional corrosion resistance, C-22 can also be readily fabricated, and it exhibits superior welding conditions and can resist the formation of grain boundary precipitates in the weld heat- affected zone. It can be readily welded using gas tungsten arc (GTAW), gas metal arc (GMAW), or shielded metal arc (SMAW) welding techniques. It resists the formation of any grain boundary precipitates in the weld’s heat-affected zone, providing excellent as-welded conditions for process applications in chemical-based industries such as food, beverage, personal care, and pharmaceutical.

Chemical Composition of C-22
Element Composition
Nickel 56.00 (As Balanced)
Cobalt 2.5 max
Chromium 22
Molybdenum 13
Tungsten 3
Iron 3
Silicon 0.08 max
Manganese 0.50 max
Carbon 0.010 max
Vanadium 0.35 max

C22 Alloy Specifications C22 Alloy Advantages
C22 Alloy Applications Welding C22 Alloy
Machining C22 Alloy Frequently Asked Questions


Banded Microstructure - Inferior Quality


Good Microstructure - Due to ESR
and Annealing Processes

Pictures courtesy of Dr. Hira Ahluwalia,
President of Material Selection Resources

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