Copper Alloy No. 61900 is an aluminum bronze with nominal 9% aluminum and 3.5% iron. It has excellent hot working characteristics and fair capacity for cold work. It is not hardenable by heat treatment. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fatigue. It also includes information on forming, heat treating, machining, and joining. Filing Code: Cu-550. Producer or source: Copper and copper alloy mills.