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7304.29.4110Having a wall thickness less than 12.7 mmkg
7304.29.4120Having a wall thickness of 12.7 mm or morekg
7304.29.4130Having a wall thickness less than 12.7 mmkg
7304.29.4140Having a wall thickness of 12.7 mm or morekg
7304.29.4150Having a wall thickness less than 12.7 mmkg
7304.29.4160Having a wall thickness of 12.7 mm or morekg
7304.29.50Of iron or nonalloy steelFree25%
7304.29.5015Having a wall thickness not exceeding 9.5 mmkg
7304.29.5030Having a wall thickness exceeding 9.5 mmkg
7304.29.5045Having an outside diameter exceeding 114.3 mm but less than 215.9 mmkg
7304.29.61Of other alloy steelFree35%
7304.29.6115Having a wall thickness not exceeding 9.5 mmkg
7304.29.6130Having a wall thickness exceeding 9.5 mmkg
7304.29.6145Having an outside diameter exceeding 114.3 mm but less than 215.9 mmkg
7304.31Other, of circular cross section, of iron or nonalloy steel:
7304.31Cold-drawn or cold-rolled (cold-reduced):
7304.31.3000Hollow barskgFree22%
7304.31.6010Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaterskg
7304.39.0002Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters:
7304.39.0002Having an outside diameter less than 38.1 mmkg
7304.39.0004Having an outside diameter of 38.1 mm or more but less than 190.5 mmkg
7304.39.0028Having a wall thickness of 6.4 mm or more but not exceeding 12.7 mmkg
7304.39.0032Having a wall thickness exceeding 12.7 mmkg
7304.39.0036Having an outside diameter exceeding 114.3 mm but less than 190.5 mm:
7304.39.0036Having a wall thickness less than 12.7 mmkg

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