Alloy 20 (UNS N08020) has improved resistance to corrosion by sulfuric acid, it finds wide use throughout the chemical industry as well as application for structures that process or stores solvents, explosives, plastics, synthetic fibers, organic chemicals, pharmaceuticals, and food-processing equipment. Excellent resistance to acid mixtures and chloride stress corrosion. Welds with matching filler metal will be slightly less corrosion resistant than the base alloy.