C-276 Hastelloy is a nickel-molybdenum-chromium-iron-tungsten alloy series.Nickel-based alloyis modernMetal MaterialsA medium-corrosion-resistant type. It mainly resists wet chlorine, various oxidizing chlorides, chloride salt solutions, sulfuric acid, and oxidizing salts, showing excellent corrosion resistance in both low and medium-temperature hydrochloric acid. Therefore, over the past three decades, it has been widely used in demanding corrosion environments across various industries such as chemicals, petrochemicals, flue gas desulfurization, pulp and papermaking, and environmental protection.

Hastelloy C-276 alloy corrosion data is indicative, but not to be used as a standard, especially in unknown environments where material selection must be tested. Hastelloy C-276 lacks sufficient Cr to resist corrosion in strongly oxidizing environments like hot concentrated nitric acid. This alloy is primarily designed for chemical process environments, particularly in the presence of mixed acids, such as exhaust gas desulfurization system outlet pipes.

Hastelloy exhibits exceptional mechanical properties, characterized by high strength and toughness, which makes it somewhat challenging to machine. It also has a strong strain-hardening tendency; at a deformation rate of 15%, it is approximately twice that of 18-8 stainless steel. Hastelloy also features a medium-temperature sensitization zone, with its sensitization tendency increasing with the deformation rate. At higher temperatures, Hastelloy is prone to absorbing harmful elements, which can degrade its mechanical and corrosion-resistant properties.