| 7304.29.20 | 30 | Having a wall thickness less than 12.7 mm | kg | | | |
| 7304.29.20 | 50 | Having a wall thickness less than 12.7 mm | kg | | | |
| 7304.29.20 | 80 | Having an outside diameter exceeding 406.4 mm | kg | | | |
| 7304.29.31 | | Threaded or coupled | | Free | | 28% |
| 7304.29.31 | 10 | Having a wall thickness less than 12.7 mm | kg | | | |
| 7304.29.31 | 30 | Having a wall thickness less than 12.7 mm | kg | | | |
| 7304.29.31 | 50 | Having a wall thickness less than 12.7 mm | kg | | | |
| 7304.29.31 | 80 | Having an outside diameter exceeding 406.4 mm | kg | | | |
| 7304.29.41 | 10 | Having a wall thickness less than 12.7 mm | kg | | | |
| 7304.29.41 | 30 | Having a wall thickness less than 12.7 mm | kg | | | |
| 7304.29.41 | 50 | Having a wall thickness less than 12.7 mm | kg | | | |
| 7304.29.41 | 80 | Having an outside diameter exceeding 406.4 mm | kg | | | |
| 7304.29.50 | | Of iron or nonalloy steel | | Free | | 25% |
| 7304.29.50 | 15 | Having a wall thickness not exceeding 9.5 mm | kg | | | |
| 7304.29.50 | 30 | Having a wall thickness exceeding 9.5 mm | kg | | | |
| 7304.29.50 | 45 | Having an outside diameter exceeding 114.3 mm but less than 215.9 mm | kg | | | |
| 7304.29.50 | 60 | Having an outside diameter of 215.9 mm or more but not exceeding 406.4 mm | kg | | | |
| 7304.29.50 | 75 | Having an outside diameter exceeding 406.4 mm | kg | | | |
| 7304.29.61 | | Of other alloy steel | | Free | | 35% |
| 7304.29.61 | 15 | Having a wall thickness not exceeding 9.5 mm | kg | | | |
| 7304.29.61 | 30 | Having a wall thickness exceeding 9.5 mm | kg | | | |
| 7304.29.61 | 45 | Having an outside diameter exceeding 114.3 mm but less than 215.9 mm | kg | | | |
| 7304.29.61 | 60 | Having an outside diameter of 215.9 mm or more but not exceeding 406.4 mm | kg | | | |
| 7304.29.61 | 75 | Having an outside diameter exceeding 406.4 mm | kg | | | |
| 7304.39.00 | 02 | Having an outside diameter less than 38.1 mm | kg | | | |
