| 7304.39.00 | 48 | Having a wall thickness less than 12.7 mm | kg | | | |
| 7304.39.00 | 52 | Having a wall thickness of 12.7 mm or more but less than 19 mm | kg | | | |
| 7304.39.00 | 16 | Galvanized, having an outside diameter not exceeding 114.3 mm | kg | | | |
| 7304.39.00 | 20 | Having an outside diameter less than 38.1 mm | kg | | | |
| 7304.39.00 | 24 | Having a wall thickness less than 6.4 mm | kg | | | |
| 7304.41.30 | | Of an external diameter of less than 19 mm | | Free | | 36% |
| 7304.59.20 | 40 | Having an outside diameter less than 38.1 mm | kg | | | |
| 7304.59.20 | 45 | Having an outside diameter of 38.1 mm or more but not exceeding 114.3 mm | kg | | | |
| 7304.59.20 | 55 | Having an outside diameter exceeding 114.3 mm but less than 190.5 mm | kg | | | |
| 7304.59.20 | 60 | Having an outside diameter of 190.5 mm or more but not exceeding 285.8 mm | kg | | | |
| 7304.59.20 | 70 | Having an outside diameter exceeding 285.8 mm but not exceeding 406.4 mm | kg | | | |
| 7304.59.20 | 80 | Having an outside diameter exceeding 406.4 mm | kg | | | |
| 7304.59.80 | 65 | Having a wall thickness of 12.7 mm or more but less than 19 mm | kg | | | |
| 7304.59.80 | 80 | Having an outside diameter exceeding 406.4 mm | kg | | | |
| 7304.59.80 | 35 | Having a wall thickness of 12.7 mm or more but less than 19 mm | kg | | | |
| 7304.59.80 | 10 | Having an outside diameter less than 38.1 mm | kg | | | |
| 7304.59.80 | 15 | Having a wall thickness less than 6.4 mm | kg | | | |
| 7304.59.80 | 20 | Having a wall thickness of 6.4 mm or more but not exceeding 12.7 mm | kg | | | |
| 7304.59.80 | 25 | Having a wall thickness exceeding 12.7 mm | kg | | | |
| 7304.59.80 | 30 | Having a wall thickness less than 12.7 mm | kg | | | |
| 7304.59.80 | 45 | Having a wall thickness less than 12.7 mm | kg | | | |
| 7304.59.80 | 50 | Having a wall thickness of 12.7 mm or more but less than 19 mm | kg | | | |
| 7304.59.80 | 60 | Having a wall thickness less than 12.7 mm | kg | | | |
| 7305.11.10 | 60 | With an external diameter exceeding 609.6 mm | kg | | | |
| 7305.11.10 | 30 | With an external diameter exceeding 406.4 mm but not exceeding 609.6 mm | kg | | | |
