USS FREMAX 15 is a low-carbon, resulfurized, rephosphorized, free-machining plate steel for applications in which ease of machining is of prime importance. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on forming, heat treating, machining, joining, and surface treatment. Filing Code: CS-19. Producer or source: United States Steel Corporation. Originally published November 1962, revised March 1971.