Allvac 718-HS and 718-DA alloys are variants of alloy 718 (see Alloy Digest Ni-90, April 1964) produced by using thermomechanical processing to develop higher mechanical properties. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on forming, heat treating, machining, and joining. Filing Code: Ni-641. Producer or source: Allvac, An Allegheny Technologies Company.