Hastelloy C-276 alloy – material for the discharge pipes in flue gas desulfurization systems

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Hastelloy C-276 alloy – Hastelloy C-276 bolts and nuts. I. Corrosion resistance: Hastelloy C-276 belongs to the nickel-based alloy family composed of nickel, molybdenum, chromium, iron, and tungsten. It is the most corrosion-resistant among modern metal materials. It is primarily resistant to moisture, various oxidizing chlorides, chloride salt solutions, sulfuric acid, and oxidizing salts, and exhibits excellent corrosion resistance in both low-temperature and medium-temperature hydrochloric acids. Therefore, over the past three decades, it has found wide application in harsh corrosive environments across various industrial sectors such as chemicals, petrochemicals, flue gas desulfurization, pulp and paper, and environmental protection. The various corrosion data for Hastelloy C-276 are typical, but they cannot be used as a standard; especially in unknown environments, testing is necessary before selecting this material. Hastelloy C-276 does not contain enough Cr to resist corrosion in highly oxidizing environments, such as hot concentrated nitric acid. This alloy was developed primarily for use in chemical processing environments, especially those with mixed acids, such as the outlet pipes of flue gas desulfurization systems