| 73 | Metals and metal products |
| 7304 | Tubes, pipes and hollow profiles, seamless, of iron (other than cast iron) |
| 730431 | Other tubes, pipes and hollow profiles, seamless circular section of iron or non-alloy steel, cold-drawn or cold-rolled (cold reduction) |
| 73043120 | Other circular cross section, of iron or non-alloy steel, cold-drawn or cold-rolled, precision tubes |