Austenitic stainless steel is a specific type of stainless steel alloy.
Austenitic stainless steels possess austenite as their primary crystalline structure. This austenite crystalline structure is achieved by sufficient additions of the austenite stabilizing elements nickel, manganese and nitrogen. Their crystalline structure prevents austenitic steels from being hardenable by heat treatment and makes them essentially non-magnetic.
There are two subgroups of austenitic stainless steel. 300 series stainless steels achieve their austenitic structure primarily by a nickel addition while 200 series stainless steels substitute manganese and nitrogen for nickel, though there is still a small nickel content.