When handling aggressive mixed‑acid, chloride‑containing chemical environments, Hastelloy C‑276 and Hastelloy C‑22 rank among the most popular nickel‑molybdenum‑chromium alloys. Many plant procurement and material engineers struggle to distinguish these two grades, as they share partial application overlap in chemical, petrochemical and flue‑gas desulfurization systems. Hastelloy C‑276 is a well‑proven nickel‑molybdenum‑chromium alloy. It resists pitting, crevice corrosion and stress‑corrosion cracking in oxidizing and reducing mixed corrosive media. Thanks to balanced molybdenum and chromium content, C‑276 works well for wet chlorine, sulfuric acid, hydrochloric acid mixed environments. It is extensively used for reactors, piping and heat exchangers. The main shortcoming of C‑276 lies in its performance in highly oxidizing acid conditions, where corrosion speed will increase. Hastelloy C‑22 raises chromium content and optimizes element ratios compared with C‑276. It delivers much better corrosion resistance in strong oxidizing corrosive media such as nitric acid mixed with ferric or cupric chlorides. C‑22 maintains excellent resistance to pitting and crevice corrosion, and performs steadily in both oxidizing and reducing mixed‑acid surroundings. It is a top pick for waste‑treatment equipment and aggressive chemical reactor internals. However, Hastelloy C‑22 comes at a higher material cost than C‑276. Simple selection reference: - Pick Hastelloy C‑276: General mixed‑acid corrosion, petrochemical pipelines, flue‑gas desulfurization equipment, cost‑sensitive projects. - Pick Hastelloy C‑22: Strong oxidizing acid service, hazardous waste processing, severe crevice‑corrosion risk working conditions. Mis‑selection of corrosion‑resistant alloy will bring unexpected equipment downtime and replacement expense. Always review material chemical datasheets against your real‑world process fluid.  Request Your Alloy Quotation Today We manufacture and export Hastelloy C‑276 and Hastelloy C‑22 plates, bars, forgings and welded components. Our technical team can assist you with grade recommendation according to your process parameters. 

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