Chemical processing units have extreme environment conditions. Fasteners used for such installments needs to be steady and durable given the prevailing conditions could be worse. Fasteners for chemical processing units should needless be having good corrosion resistance, resistant to predominant nature of the present chemical along with stability in strength over a range of operational temperature.
Hastelloy C276, Alloy 20, 904L, Nitronic, Tantalum are some trivial alloys for making fasteners used in chemical processing plants.