It is an austenitic stainless steel alloy with high nickel (24%), chromium (22%), molybdenum (6%), and nitrogen (0.18%) content and is commonly known as superaustenitic stainless steel (alloys such as 254 SMO (UNS?S31254) and 904L (UNS?N08904) also fall under the superaustenitic designation) while 2205 (UNS S32305 \ / S31803) och 2507 (UNS S32750) är duplex respektive super duplex rostfritt stål.