730511 Line pipe of a kind used for oil or gas pipelines, Longitudinally submerged arc welded:
730512 Other Line pipe of a kind used for oil or gas pipelines, longitudinally welded
730519 Other Line Pipe, Welded, More than 406.4mm in External Diameter
730520 Casing of a kind used in drilling for oil or gas
730531 Other Tubes and Pipes, Longitudinally welded:
730539 Other Tubes and Pipes, Welded, of Iron or Steel
730590 Other Tubes and Pipes, Riveted or Similarly Closed, of Iron or Steel
