USS MACH-5 is a leaded resulfurized low-carbon steel containing bismuth. It is characterized by outstanding machinability, up to 50% better tool life, increased production and quality of machined parts, and up to 65% savings in job time. 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, joining, and surface treatment. Filing Code: CS-52. Producer or source: United States Steel Corporation.