FDX 27 is an austenitic/ferritic duplex stainless steel with an austenite phase balanced to form martensite when cold worked by the TRIP effect. This datasheet provides information on composition, physical properties, microstructure, tensile properties. It also includes information on corrosion resistance as well as forming and joining. Filing Code: SS-1236. Producer or source: Outokumpu High Performance Stainless.