Austenitic stainless steel is one of the five families of stainless steel (along with ferritic, martensitic, duplex and precipitation hardened).[1] Its primary crystalline structure is austenite (face-centered cubic). Such steels are not hardenable by heat treatment and are essentially non-magnetic.[2] This structure is achieved by adding enough austenite-stabilizing elements such as nickel, manganese and nitrogen.[citation needed] The Incoloy family of alloys belong to the category of super austenitic stainless steels.[3]