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 stainless steel: > Other > Other: > 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 7304.49.00.45
25-6MO Stainless Condenser Service Tube
Seamless 25-6MO (UNS N08925) stainless tube replacement for condenser service in combined cycle plants. Optimized for cooling water with chlorides. 7304.49.0045 due to condenser application and seamless stainless steel circular profile.
Type 317LMN Boiler Economizer Tube
Seamless Type 317LMN stainless tube for boiler economizers recovering waste heat, with nitrogen-enhanced strength. Circular cross-section for flue gas heat transfer. Classifies under 7304.49.0045 as suitable for boilers despite economizer function.
904L Stainless Refinery Heater Tube
Seamless 904L (N08904) high nickel stainless tube for convection sections of refinery process heaters. Copper-bearing alloy resists polythionic acid stress corrosion. 7304.49.0045 for refining furnace suitability.
Alloy 825 Heat Exchanger Process Tube
Seamless Incoloy Alloy 825 (N08825) tube for sour gas heat exchangers in upstream oil/gas. Ni-Fe-Cr-Mo-Cu for H2S service. 7304.49.0045 heat exchanger classification.
316Ti Stabilized Superheater Pendant Tube
Seamless 316Ti stainless pendant tubes hanging in superheater plenums. Titanium stabilization prevents carbide sensitization. 7304.49.0045 superheater use.
2205 Duplex Feedwater Heater Tube
Duplex 2205 seamless replacement tubes for high-pressure feedwater heaters. Improved fatigue resistance over 316L. 7304.49.0045 feedwater heater.
AL6XN Marine Condenser Tube
AL-6XN seamless tubes for seawater-cooled marine propulsion condensers. CREVPASS® trademark alloy. 7304.49.0045 condenser classification.
AISI 316L Seamless Stainless Steel Boiler Tube
Seamless tube made from AISI 316L stainless steel, designed with circular cross-section for high-pressure steam boilers in industrial power plants. It meets ASME SA-213 specifications for elevated temperature service, ensuring corrosion resistance and structural integrity under thermal stress. Classified under 7304.49.0045 due to its suitability for boilers and seamless stainless steel construction.
TP347H Seamless Stainless Superheater Tube
High-temperature resistant TP347H seamless stainless steel tube with circular cross-section, optimized for superheaters in fossil fuel boilers. Features enhanced creep strength for prolonged exposure to steam at over 600°C. Falls under 7304.49.0045 for its specific suitability in superheaters and seamless stainless construction.
Incoloy 800H Heat Exchanger Seamless Tube
Seamless circular tube from Incoloy 800H nickel-iron-chromium alloy (UNS N08811), classified as stainless steel, for shell-and-tube heat exchangers in petrochemical plants. Provides oxidation resistance up to 1100°C, ideal for refining processes. Meets 7304.49.0045 criteria for heat exchanger suitability and seamless stainless steel form.
ASME SA-213 TP304 Stainless Condenser Tube
Seamless TP304 stainless steel tube per ASME SA-213 for surface condensers in steam turbine power plants, featuring thin walls for efficient heat transfer. Circular cross-section with precise tolerances for high-vacuum conditions. Classified in 7304.49.0045 for condenser applications and seamless stainless steel composition.
TP321 Stainless Feedwater Heater Tube
Seamless TP321 stabilized stainless steel tube for high-pressure feedwater heaters in thermal power stations, resistant to intergranular corrosion. Circular cross-section engineered for deaeration and preheating processes. Qualifies for 7304.49.0045 due to feedwater heater suitability and seamless stainless steel makeup.
Duplex 2205 Seamless Refining Furnace Tube
Seamless Duplex 2205 (S31803) stainless steel tube for process furnace tubes in oil refineries, offering superior SCC resistance in sulfur-rich environments. Circular cross-section for cracking and reforming furnace coils. Included in 7304.49.0045 for refining furnace use and high stainless alloy content.
SMO 254 Seamless Superheater Tube
Seamless SMO 254 (6Mo) super austenitic stainless tube for superheaters in biomass boilers, with exceptional chloride pitting resistance. Circular cross-section for radiant and convection zones. Fits 7304.49.0045 for superheater end-use and premium stainless steel grade.
AL-6XN Stainless Heat Exchanger U-Tube
Pre-formed U-bend seamless AL-6XN stainless steel tubes for floating head heat exchangers in desalination plants. UNS N08367 alloy provides seawater corrosion resistance. 7304.49.0045 classification for heat exchanger suitability, seamless stainless construction with circular section.