73 | Metals and metal products |
7306 | Tubes, pipes and hollow profiles (for example, open seam or welded, riveted or similarly closed), of iron |
730630 | Pipes, tubes, and profiles other welded, circular cross-section of iron or non-alloy steel |
73063077 | Other welded pipes, of circular cross section, of iron or non-alloy steel, external diameter not exceeding 168.3 mm, galvanized |