| 7304.41.30 | 05 | Of high-nickel alloy steel | kg | | | |
| 7304.41.30 | 15 | Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters | kg | | | |
| 7304.41.60 | 05 | Of high-nickel alloy steel | kg | | | |
| 7304.41.60 | 15 | Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters | kg | | | |
| 7304.49.00 | 05 | Of high-nickel alloy steel | kg | | | |
| 7304.49.00 | 45 | Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters | kg | | | |
| 7304.51 | | Other, of circular cross section, of other alloy steel: | | | | |
| 7304.51.50 | 05 | Of high-nickel alloy steel | kg | | | |
| 7304.51.50 | 15 | Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters: | | | | |
| 7304.51.50 | 15 | Of heat-resisting steel | kg | | | |
| 7304.59.20 | 30 | Of heat-resisting steel | kg | | | |
| 7304.59.20 | | Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters | | Free | | 35% |
| 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 | | | |
| 7304.59.60 | 00 | Of heat-resisting steel | kg | Free | | 36% |
| 7304.59.80 | 80 | Having an outside diameter exceeding 406.4 mm | kg | | | |
| 7304.59.80 | 45 | Having an outside diameter of 190.5 mm or more but not exceeding 285.8 mm: | | | | |
| 7304.59.80 | 15 | Having an outside diameter of 38.1 mm or more but not exceeding 114.3 mm: | | | | |
| 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 an outside diameter exceeding 114.3 mm but less than 190.5 mm: | | | | |
| 7304.59.80 | 60 | Having an outside diameter exceeding 285.8 mm but not exceeding 406.4 mm: | | | | |
