Having an outside diameter of 38.1 mm or more but less than 190.5 mm
Tubes, pipes and hollow profiles, seamless, of iron (other than cast iron) or steel: > Other, of circular cross section, of iron or nonalloy steel: > Other > Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters: > Having an outside diameter of 38.1 mm or more but less than 190.5 mm
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Effective with respect to entries on or after September 27, 2024, articles the product of China, as provided for in subdivision (b) of U.S. note 31 to this subchapter
Products classified under HTS 7304.39.00.04
125mm Steam Drum Tube
Large 125 mm OD seamless tube for steam drum risers in industrial boilers. HTS 7304.39.0004 applies for boiler-suitable seamless iron/nonalloy tubes in 38.1-190.5 mm range. Connects waterwall tubes to steam drum in high-pressure boilers.
ASTM A179 Carbon Steel Boiler Tube
Seamless carbon steel tube designed for use in heat exchangers and boilers, with an outside diameter of 50 mm, meeting ASTM A179 specifications for low-carbon steel suitable for bending and flanging. It falls under HTS 7304.39.0004 due to its seamless construction, circular cross-section between 38.1 mm and 190.5 mm OD, and explicit suitability for boilers and heat exchangers. These tubes are critical for high-pressure steam and water applications in industrial settings.
SA-192 High-Pressure Boiler Tube
Seamless carbon steel tube per ASME SA-192 for high-pressure boilers, featuring 75 mm OD and wall thickness for superheater applications. Classified in 7304.39.0004 for its seamless iron/nonalloy steel construction suitable for boilers and superheaters within the specified diameter range. Essential for power generation and industrial steam systems.
ASTM A210 Grade A1 Heat Exchanger Tube
Seamless medium-carbon steel tube ASTM A210 Gr.A1 with 100 mm OD for condenser and heat exchanger service in refining furnaces. Meets HTS 7304.39.0004 criteria as nonalloy seamless tube of circular section suitable for heat exchangers with diameter 38.1-190.5 mm. Used in petrochemical plants for efficient heat transfer.
Carbon Steel Superheater Tube 2-inch Schedule 40
Schedule 40 seamless carbon steel tube, 60.3 mm (2-inch nominal) OD for superheaters in utility boilers. Fits HTS 7304.39.0004 precisely as iron/nonalloy seamless tube suitable for superheaters in the specified diameter range. Critical for raising steam temperature in power plants.
ASTM A106 Grade B Feedwater Heater Tube
Seamless A106 Gr.B carbon steel tube, 152.4 mm OD for feedwater heaters in steam cycles. Classifies under 7304.39.0004 for seamless nonalloy tubes suitable for feedwater heaters within 38.1-190.5 mm diameter. Used in fossil fuel power stations for preheating boiler feedwater.
Refinery Furnace Process Tube 4-inch
Seamless carbon steel tube 101.6 mm (4-inch) OD for refining furnace process lines and transfer lines. Meets 7304.39.0004 as suitable for refining furnaces, seamless iron/nonalloy steel, circular section 38.1-190.5 mm OD. Withstands high-temperature hydrocarbon service in oil refineries.
Condenser Service Water Tube 3-inch
3-inch (76.2 mm OD) seamless carbon steel tube for condenser service water systems in power plants. Falls under HTS 7304.39.0004 for seamless tubes suitable for condensers, iron/nonalloy steel, diameter 38.1-190.5 mm. Handles cooling water circulation in steam turbine condensers.
50mm OD Boiler Economizer Tube
Seamless carbon steel economizer tube 50 mm OD for recovering waste heat in boiler stacks. Classified 7304.39.0004 as suitable for boilers, seamless circular nonalloy steel tube 38.1-190.5 mm OD. Improves boiler efficiency by preheating combustion air or feedwater.
Heat Recovery Steam Generator Tube
Seamless carbon steel tube 89 mm OD for HRSG high-pressure sections. 7304.39.0004 classification for heat exchanger suitable tubes in gas turbine combined cycle plants. Recovers turbine exhaust heat to generate steam.