6 Unwrought and Partly Wrought Common Metals and Their Alloys-Namely, Steel Balls, Bearing Steels, Case Hardening Steels, Heat Treatable Steels, Constructional Steels, Spring Steels, Magnetic Steels, Tool Steels, High-Speed Steels in Various Shapes Such as Tubes, Bars, Wire Rod, Drawn Wire, Strips, and Rings