HASTELLOY C 276
HASTELLOY C 276 alloy is a nickel-molybdenum-chromium wrought alloy that is generally considered a versatile corrosion resistant alloy. C-276 alloy need to be solution heat-treated after welding and has vastly improved fabricability. This alloy resists the formation of grain boundary precipitates in the weld heat-affected zone, thus making is suitable for most chemical process applications in the as welded condition.
C-276 alloy has excellent resistance to localized corrosion and to both oxidizing and reducing media. Because of its versatility, C-276 alloy can be used where “upset” conditions are likely to occur or in multipurpose plants. Hastelloy C-276 alloy has excellent resistance to a wide variety of chemical process environments, including strong oxidizers such as ferric and cupric chlorides, hot contaminated media (organic and inorganic), chlorine, formic and acetic acids, acetic anhydride and seawater and brine solutions. It is used in flue gas desulfurization systems because of its excellent resistance to sulfur compounds and chloride ions encountered in most scrubbers.
It is also one of the few materials that withstands the corrosive effects of wet chlorine gas, hypochlorite and chlorine dioxide.
HASTELLOY C 22
HASTELLOY C 22 alloy is a versatile nickel-chromium-molybdenum-tungsten alloy with better overall corrosion resistance. C-22 alloy has outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking. It has excellent resistance to oxidizing aqueous media including wet chlorine and mixtures containing nitric acid or oxidizing acids with chloride ions. Also, C-22 alloy offers optimum resistance to environments where reducing and oxidizing conditions are encountered in process streams. Because of such versatility it can be used where “upset” conditions are likely to occur or in multi-purpose plants.
C-22 alloy has exceptional resistance to a wide variety of chemical process environments, including strong oxidizers such as ferric and cupric chlorides, chlorine, hot contaminated solutions (organic and inorganic), formic and acetic acids, acetic anhydride, and seawater and brine solutions.