Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters
Tubes, pipes and hollow profiles, seamless, of iron (other than cast iron) or steel: > Other, of circular cross section, of iron or nonalloy steel: > Cold-drawn or cold-rolled (cold-reduced): > Other > Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters
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 7304.31.60.10
Cold-Drawn Evaporator Condenser Tube
Seamless tube for evaporator-condenser circuits in refining distillation columns. Dual duty classification under condensers and refining.
Surface Condenser Carbon Steel Tube
Cold-reduced tube for power plant surface condensers, seamless nonalloy for cooling high-purity steam condensate. Precision ID for insertable spears. 7304.31.60.10 for condenser duty.
Cold-Rolled Superheater Element Tube
Seamless tube elements for pendant superheater assemblies in coal-fired boilers. Cold-formed for shop fabrication. Classified for superheaters.
Process Heater Seamless Tube
Cold-drawn tube for fired process heaters in gas processing plants. Nonalloy steel for general hydrocarbon service. Refining furnace suitable.
Deaerator Heater Tube
Seamless cold-rolled tube bundle for deaerating feedwater heaters. Removes dissolved oxygen from boiler feed. Feedwater heater classification.
Waste Heat Boiler Tube
Cold-formed seamless tubes for HRSG waste heat recovery boilers in gas turbine plants. Circulating cross section for gas-side convection.
Cold-Drawn Boiler Tube ASTM A179
Seamless carbon steel tube, cold-drawn, with circular cross section, specifically designed for use in fire-tube boilers to convey high-pressure steam and water. Meets ASTM A179 specifications for low-carbon steel suitable for bending and flaring. Classified under 7304.31.60.10 due to its seamless construction and explicit suitability for boilers.
Seamless Superheater Tube SA-192
Cold-rolled seamless tube of nonalloy steel per ASME SA-192, with precise wall thickness for high-temperature steam superheating in power plant boilers. Circular cross section under 16 mm wall, designed to withstand thermal stress. Falls under 7304.31.60.10 for its cold-formed seamless profile suited for superheaters.
Cold-Reduced Heat Exchanger Tube ASTM A213 T11
Note: T11 is alloy, using A179 equivalent nonalloy for accuracy. Seamless cold-reduced carbon steel tube ASTM A179 variant for shell-and-tube heat exchangers in refining. Thin wall, circular profile for efficient heat transfer in corrosive environments. HTS 7304.31.60.10 applies to cold-formed seamless tubes designated for heat exchangers.
Feedwater Heater Tube SA-210
ASME SA-210 Grade A1 cold-drawn seamless carbon steel tube for economizer/feedwater heaters in utility boilers, featuring high thermal conductivity. Medium wall thickness, circular cross section for bundle insertion. Meets 7304.31.60.10 criteria for feedwater heater use.
Cold-Drawn U-Tube for Heat Exchangers
Seamless cold-formed U-shaped carbon steel tube for removable bundles in process heat exchangers, nonalloy steel with 0.8-2.0 mm wall. Designed for thermal expansion in refining service. 7304.31.60.10 classification for cold-reduced tubes in heat exchangers.
Boiler Economizer Tube
Cold-rolled seamless steel tube for economizer sections in recovery boilers, enhancing preheating efficiency. Nonalloy composition for cost-effective high-volume use. Suits 7304.31.60.10 for boiler application.
Cracking Furnace Tube Alloy Substitute
Cold-drawn seamless tube functioning as nonalloy alternative in ethylene cracking furnaces. Circular profile resists creep at 900°C. HTS specific for refining furnaces.
Condenser Service Seamless Steel Tube
Cold-drawn seamless nonalloy steel tube optimized for surface condensers in steam power plants, with enhanced corrosion resistance for cooling water duty. Circular cross section, cold-rolled finish for tight tolerances. Classified in 7304.31.60.10 as suitable for condensers per its design specs.
Refinery Furnace Seamless Tube ASTM A106
Cold-rolled Grade B seamless carbon steel tube per ASTM A106 for process furnace tubes in petroleum refining, handling high temperatures up to 800°F. Circular profile with controlled chemistry for carburization resistance. 7304.31.60.10 due to cold-reduction and refinery furnace suitability.