Steel pipe.
Aluminum tube.
Stainless steel, carbon steel, alloy steel in shape of tubes, pipes, fittings, valves, flanges.
Copper and copper alloy products like copper sheet, copper foil, copper strip, copper bar, copper rod, copper wire, copper tube, copper pipe.
Steel, galvanized steel, stainless steel, steel angle, steel channel, steel bean, steel h beam, steel round bars, steel equal bars, steel pipe, steel tube, steel plate, steel sheets, steel coil.