| 7304.29.31 | 30 | Having an outside diameter of 215.9 mm or more but not exceeding 285.8 mm: |  |  |  |  | 
| 7304.29.31 | 30 | Having a wall thickness less than 12.7 mm | kg |  |  |  | 
| 7304.29.31 | 40 | Having a wall thickness of 12.7 mm or more | kg |  |  |  | 
| 7304.29.31 | 50 | Having an outside diameter exceeding 285.8 mm but not exceeding 406.4 mm: |  |  |  |  | 
| 7304.29.31 | 50 | Having a wall thickness less than 12.7 mm | kg |  |  |  | 
| 7304.29.31 | 60 | Having a wall thickness of 12.7 mm or more | kg |  |  |  | 
| 7304.29.31 | 80 | Having an outside diameter exceeding 406.4 mm | kg |  |  |  | 
| 7304.29.31 |  | Of other alloy steel: |  |  |  |  | 
| 7304.29.31 |  | Threaded or coupled |  | Free |  | 28% | 
| 7304.29.41 |  | Other |  | Free |  | 8.5% | 
| 7304.29.41 | 10 | Having an outside diameter less than 215.9 mm: |  |  |  |  | 
| 7304.29.41 | 10 | Having a wall thickness less than 12.7 mm | kg |  |  |  | 
| 7304.29.41 | 20 | Having a wall thickness of 12.7 mm or more | kg |  |  |  | 
| 7304.29.41 | 30 | Having an outside diameter of 215.9 mm or more but not exceeding 285.8 mm: |  |  |  |  | 
| 7304.29.41 | 30 | Having a wall thickness less than 12.7 mm | kg |  |  |  | 
| 7304.29.41 | 40 | Having a wall thickness of 12.7 mm or more | kg |  |  |  | 
| 7304.29.41 | 50 | Having an outside diameter exceeding 285.8 mm but not exceeding 406.4 mm: |  |  |  |  | 
| 7304.29.41 | 50 | Having a wall thickness less than 12.7 mm | kg |  |  |  | 
| 7304.29.41 | 60 | Having a wall thickness of 12.7 mm or more | kg |  |  |  | 
| 7304.29.41 | 80 | Having an outside diameter exceeding 406.4 mm | kg |  |  |  | 
| 7304.29.50 |  | Tubing: |  |  |  |  | 
| 7304.29.50 |  | Of iron or nonalloy steel |  | Free |  | 25% | 
| 7304.29.50 | 15 | Having an outside diameter not exceeding 114.3 mm: |  |  |  |  | 
| 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 |  |  |  |