Hastelloy C-22, also called as alloy C22, is an adaptable austenitic nickel-chromium-molybdenum-tungsten alloy with upgraded resistance to pitting, crevice corrosion and stress corrosion cracking. The high chromium content gives excellent resistance to oxidizing media while the molybdenum and tungsten content give very good resistance to decreasing media.
This nickel steel alloy likewise has magnificent resistance to oxidizing aqueous media, consisting wet chlorine and mixtures containing nitric acid or oxidizing acids with chlorine ions. Different corrosives Hastelloy C-22 has resistance to are oxidizing acid chlorides, wet chlorine, formic and acetic acids, ferric and cupric chlorides, sea water, brine and many mixed or contaminated chemical solutions, both natural and inorganic. These nickel alloys offer ideal resistance to situations where reducing and oxidizing conditions are experienced in process streams. This is valuable in multi-reason plants where such "upset" conditions happen oftentimes. These nickel alloys resist the development of grain-limit accelerates in the weld heat-influenced area, subsequently making it suitable for most chemical process applications in the as-welded condition. Alloy C-22 ought not to be utilized as a part of service temperatures above 1250° F because of the formation of adverse stages which form over this temperature.
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