ATI 2304 is a lean duplex alloy with a microstructure that consists of a nearly equal mixture of ferrite and austenite. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-1109. Producer or source: Allegheny Technologies Inc..