The chemical industry is a highly sensitive one for the reason that it deals with chemical reactions on a large scale. Naturally, these reactions would be dangerous and unsafe in the lack of an environment that eliminates all safety related risks. Creating this environment means using a good alloy, much like Alloy 20.
Made out of molybdenum, nickel, chromium and copper, this alloy is resistant to high temperatures, as well as to corrosive factors of both organic and inorganic nature. But what is most important is that the wide range of chemicals being managed in a chemical plant will not affect the structure and well-being of the structures made out of this alloy.