7305: Pipe, welded, riveted iron or steel, diameter >406.4m

730511: Pipe-line submerged arc welded steel diameter >406mm 730512: Pipe-line longitudinal nes welded steel,diameter>406m 730519: Pipe (oil/gas line) iron or steel nes, diameter >406m 730520: Casings,circular, iron/steel, oil/gas drilling >406mm 730531: Steel pipes nes, longitudinally welded diameter>406mm 730539: Pipes nes, iron/steel, welded nes, diameter >406.4mm 730590: Tube/pipe nes,iron/steel riveted etc, diameter>406.4m 7305: Pipe, welded, riveted iron or steel, diameter >406.4m