AMS 5656

Nitronic 40, also known as 21-6-9, is a high manganese, high nitrogen, austenitic stainless steel melted as AOD or AOD + ESR melt type. This alloy offers excellent high temperature oxidation resistance and has good strength in the annealed condition. This grade also has excellent toughness at cryogenic temperatures. N40 is used in a number of different applications such as pollution control equipment, aircraft engine parts and chemical processing.