6 unwrought and partially wrought nonprecious metals and their alloys for further manufacture; cast structural members of nonprecious metals and their alloys, namely, beams, braces, brackets, and casting forms for concrete; and articles made of nonprecious metal, namely, anchors, anvils, elevator chains, junctions for pipes, namely, compressed air pipes, plumbing pipes, and pipes for conveying air or natural gas, manually operated valves, cash boxes, gratings, signboards, number plates for vehicles, transport containers, storage tanks, cotter pins, hose fittings, hinges, and ceiling panels