| 730610 | Line pipe Of a kind used for oil or gas pipelines |
| 730611 | 730611 - Steel; stainless; line pipe of a kind used for oil or gas pip |
| 730619 | 730619 - Iron or steel (excluding cast iron); line pipe of a kind used |
| 730620 | Casing and tubing Of a kind used in drilling for oil or gas |
| 730621 | 730621 - Steel, stainless; casing and tubing of a kind used in drillin |
| 730629 | 730629 - Iron or steel (excluding cast iron); casing and tubing of a k |
| 730630 | 730630 - Iron or non-alloy steel (excluding cast iron); tubes and pipe |
| 730640 | 730640 - Steel, stainless; tubes, pipes and hollow profiles, welded, o |
| 730650 | 730650 - Steel, alloy; tubes, pipes and hollow profiles (other than st |
| 730660 | Other, welded, Of non-circular cross-section |
| 730661 | 730661 - Iron or steel (excluding cast iron); tubes, pipes and hollow |
| 730669 | 730669 - Iron or steel (excluding cast iron); tubes, pipes and hollow |
| 730690 | 730690 - Iron or steel (excluding cast iron); tubes, pipes and hollow |