Hastelloy C276 vs C22: Corrosion Resistance, Composition, and Applications
When selecting materials for aggressive chemical or seawater environments, engineers often compare Hastelloy C276 and Hastelloy C22 . Both are nickel-chromium-molybdenum superalloys designed for extreme corrosion resistance. However, their performance differs significantly in chloride-rich environments. The key reason is chromium content . Hastelloy C22 contains about 22% chromium , much higher than C276 (~15.5%), which gives C22 superior resistance to pitting, crevice corrosion, and chloride stress corrosion cracking. Chemical Composition Difference Higher chromium is the main reason C22 performs better in seawater and wet chlorine conditions. Corrosion Resistance Comparison Choose C22 if your environment includes: Seawater systems Offshore platforms Wet chlorine gas High chloride process lines Pollution control equipment Choose C276 for: Heat exchangers Chemical reactors General acid environments Projects with budget sensitivity Mechanical Proper...