Having an outside diameter less than 38.1 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 less than 38.1 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 7304.39.00.02
ASTM A179 Carbon Steel Superheater Tube OD 19mm
Seamless cold-drawn carbon steel tube conforming to ASTM A179 standards, with 19mm OD for superheater applications in power plants. Classified under HTS 7304.39.0002 for its non-alloy steel composition, circular seamless profile, and design for superheaters handling high-temperature steam. Provides excellent corrosion resistance and thermal conductivity.
Refinery Furnace Process Tube OD 35mm
Seamless non-alloy steel tube, OD 35mm, for process furnaces in oil refineries handling high-temperature hydrocarbon streams. Classified in HTS 7304.39.0002 for circular seamless construction suitable for refining furnaces, providing creep resistance under elevated temperatures. Essential for cracking and reforming operations.
Seamless Carbon Steel Boiler Tube OD 25mm
A seamless tube made from non-alloy steel with an outside diameter of 25mm, precision-engineered for use in high-pressure steam boilers. It falls under HTS 7304.39.0002 due to its circular cross-section, seamless construction, and suitability for boilers where pressure resistance is critical. The small diameter ensures efficient heat transfer in compact boiler designs.
SA-192 Boiler Feedwater Heater Tube OD 32mm
Seamless carbon steel tube per ASME SA-192 specification, 32mm OD, optimized for feedwater heaters in boiler systems to preheat incoming water. HTS 7304.39.0002 applies to its iron/nonalloy steel seamless construction, small circular diameter, and explicit suitability for feedwater heaters. Ensures minimal thermal loss and high pressure integrity.
Seamless Steel Condenser Tube OD 28mm
Non-alloy seamless steel tube with 28mm outside diameter, designed for steam condensers in power generation and industrial cooling systems. Falls under HTS 7304.39.0002 as a circular cross-section seamless pipe suitable for condensers, offering superior heat exchange without weld seams. Corrosion-resistant for wet steam environments.
Carbon Steel Heat Exchanger U-Tube OD 22mm
Bent seamless carbon steel U-tube with 22mm OD for shell-and-tube heat exchangers in refining and chemical processing. HTS 7304.39.0002 covers its non-alloy seamless circular profile and heat exchanger suitability, despite U-bend, as bending doesn't alter base tube classification. High fatigue resistance for thermal cycling.
Small Diameter Boiler Economizer Tube OD 16mm
Ultra-small OD 16mm seamless carbon steel tube for economizer sections in industrial boilers, recovering waste heat. HTS 7304.39.0002 due to nonalloy seamless circular design suitable for boilers, maximizing surface area in compact installations. Thin walls for optimal heat recovery efficiency.
Seamless Steel Fin-Tube Base OD 30mm
Plain seamless tube OD 30mm serving as base for aluminum finned heat exchanger tubes in air preheaters. Under HTS 7304.39.0002 for nonalloy steel seamless circular form suitable for heat exchangers, prior to fin attachment. Provides structural core for extended surface exchangers.
High-Pressure Carbon Steel Tube OD 12.7mm
Metric 12.7mm OD seamless carbon steel tube rated for superheater high-pressure zones in utility boilers. HTS 7304.39.0002 classification reflects its small diameter circular seamless profile and superheater application in extreme pressure/temperature service. Meets stringent SA-210 Grade C specs.
Condenser Service Water Tube OD 34mm
Seamless non-alloy steel tube OD 34mm for service water side of surface condensers in nuclear and fossil power plants. Fits HTS 7304.39.0002 as circular seamless pipe suitable for condensers, handling cooling water without leakage risks from welds. Enhanced cleanliness for biofouling resistance.