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Hastelloy® is the registered trademark name of Haynes International, Inc. The trademark
is applied as the prefix name of a range of over twenty different highly
corrosion resistant metal alloys loosely grouped by the metallurgical
industry under the material term “superalloys” or “high
performance alloys”.
Picture at right: Hastelloy is used as thin sheet-liner material in power utility flue-gas desulfurization system. Courtesy of Haynes International
The predominant alloying ingredient is typically the transition metal nickel. Other alloying ingredients are added to nickel in each of the subcategories of this trademark designation and include varying percentages of the elements molybdenum, chromium, cobalt, iron, copper, manganese, titanium, zirconium, aluminum, carbon, and tungsten.
The primary function of the Hastelloy super alloys is that of effective survival under high temperature, high stress service in a moderately to severely corrosive, and/or erosion prone environment where more common and less expensive iron-based alloys would fail—including the pressure vessels of some nuclear reactors, chemical reactors, and pipes and valves in chemical industry.