CARPENTER HyMu 80 alloy is an unoriented soft magnetic alloy with extremely high initial permeability as well as maximum permeability with minimum hysteresis loss. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: Ni-375. Producer or source: Carpenter.