Nirosta 4640 is a low-cost lean austenitic alloy that exhibits many of the same properties as the established alloys such as Type 304SS. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-1024. Producer or source: ThyssenKrupp Nirosta GmbH.