Alloy 22
Characteristics
ALLOY22 is a Ni-Cr-Mo alloy containing W and extremely low carbon and Si contents.
outstanding resistance to a wide range of corrosive media, under oxidizing and reducing conditions
excellent resistance to pitting, crevice corrosion, and stress-corrosion cracking.
Corrosion resistance
The chemical composition of Alloy 22 has been designed to give it outstanding corrosion resistance in as wide a range of media as possible, both oxidizing and reducing. The high chromiurn content of the alloy makes it particularly suitable for oxidizing conditions, including wet chlorine gas, hypochlorite solutions or oxidizing acids. It is remarkably resistant to localized attack by halide ions, even under severe conditions of low pH and high temperatures. It resists attack in media contaminated by oxidizing chlorides such as ferric chloride or cupric chloride. Alloy 22 is also resistant to many reducing media. As a result it can be used for equipment in polyvalent
chemical plant where widely varying conditions may be encountered. The very low carbon content of Alloy 22, together with its balanced composition, reduce the tendency to formation of grain-boundary precipitates in the heat-affected zone during welding, thus
making it suitable in the as-welded condition for many applications in the chemical process industry.
Applications
The versatile nature of Alloy 22 combined with its excellent mechanical properties mean that it can be used in a wide variety of applications, including: