Alloy 20 is a nickel-iron-chromium austenitic alloy developed for maximum resistance to acid attack, particularly sulfuric acid. This super alloy has a high resistance to corrosion, crevice corrosion and pitting in chemicals containing phosphoric, sulfuric and nitric acids. It also contains niobium for stabilization against sensitization and resultant intergranular corrosion.
Alloy 20 is a combination of high corrosion resistance with mechanical properties and easy fabrication. Although designed originally to be used in sulfuric acid related industries, Alloy 20 is now a popular choice for a range of industries that include food, pharmaceutical and plastics industries. Furthermore, this super alloy is used in mixing tanks, heat exchangers, metal cleaning and pickling equipment, and piping.