Having an outside diameter exceeding 114.3 mm 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 other alloy steel: > Other: > Other: > Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters > Other: > Having an outside diameter exceeding 114.3 mm 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 7304.59.20.55
P92 Advanced Alloy Boiler Tube
SA-335 P92 9Cr-2W seamless tube, 150 mm OD, for USC boiler walls. Ultra-supercritical service. Classified 7304.59.20.55.
347TP Seamless Superheater Tube
347TP seamless alloy tube, 170 mm OD, ASME-certified for superheater pendants. Niobium-stabilized for weldability. 7304.59.20.55 classification.
P9 9Cr-1Mo Seamless Boiler Tube
SA-335 P9 tube, 125 mm OD, for economizer sections in recovery boilers. High creep rupture strength. Fits 7304.59.20.55 specs.
800HT Superheater Tube
Incoloy 800HT seamless tube, 185 mm OD, for high-temp superheaters. Aged for precipitation hardening. 7304.59.20.55 alloy steel.
TP347HFG Feedwater Tube
TP347HFG fine-grain seamless tube, 135 mm OD, for high-pressure feedwater heaters. Enhanced fatigue resistance. 7304.59.20.55.
SA-213 TP304 Seamless Alloy Steel Boiler Tube
This seamless tube made from TP304 austenitic stainless alloy steel has an outside diameter of 150 mm and is designed for high-pressure boiler applications. It meets ASME SA-213 specifications for use in superheaters and boilers, ensuring resistance to corrosion and high temperatures. Classified under 7304.59.20.55 due to its circular cross-section, alloy steel composition, and OD between 114.3 mm and 190.5 mm, suitable for boiler service.
SA-213 TP316 Seamless Stainless Boiler Tube
Seamless TP316 alloy steel tube with 165 mm OD, optimized for superheaters in power generation boilers due to superior corrosion resistance in harsh environments. Fabricated from low-carbon stainless alloy for elevated temperature service per ASME standards. Fits 7304.59.20.55 as other alloy steel tube suitable for boilers, with specified diameter range.
T/P91 Grade 91 Seamless Heat Exchanger Tube
Grade 91 (9Cr-1Mo-V) seamless alloy steel tube, 140 mm OD, engineered for high-temperature heat exchangers and feedwater heaters in fossil fuel plants. Provides excellent creep strength and oxidation resistance. Under 7304.59.20.55 for its alloy composition, seamless construction, and suitability for heat exchangers with OD 114.3-190.5 mm.
SA-335 P11 Seamless Refinery Furnace Tube
1.25Cr-0.5Mo (P11) seamless alloy tube, 130 mm OD, for transfer lines in refining furnaces and crackers. Hot-finished for high-temperature hydrocarbon service with good resistance to sulfidation. Classified in 7304.59.20.55 as other alloy steel seamless pipe suitable for refining furnaces, diameter compliant.
SA-213 TP310 Seamless Superheater Tube
TP310 high-nickel alloy steel seamless tube, 175 mm OD, for superheater sections in utility boilers exposed to extreme oxidation. Offers superior high-temperature strength per ASME SA-213. 7304.59.20.55 applies for alloy steel, seamless, boiler-suitable, mid-range OD.
Grade 347H Seamless Feedwater Heater Tube
Stabilized 347H seamless alloy tube, 120 mm OD, for feedwater heaters resisting intergranular corrosion after welding. ASME-approved for power plant closed feedwater systems. Fits 7304.59.20.55 criteria: alloy steel, circular seamless, heater-suitable, specified diameter.
P22 2.25Cr-1Mo Seamless Condenser Tube
SA-335 P22 alloy seamless tube, 155 mm OD, for surface condensers in steam turbines handling wet steam. Provides hydrogen resistance for thick-wall applications. 7304.59.20.55 for condenser-suitable alloy steel tube in diameter range.
Incoloy 800H Boiler Tube
Incoloy 800H nickel-iron-chromium alloy seamless tube, 180 mm OD, for boiler tube panels in HRSG units. Excellent for cyclic thermal fatigue. Classified 7304.59.20.55 as other alloy steel suitable for boilers.
SA-213 TP321 Seamless Heat Exchanger Tube
Titanium-stabilized TP321 seamless tube, 145 mm OD, for shell-and-tube heat exchangers in chemical processing. Prevents carbide precipitation. 7304.59.20.55: alloy steel, heat exchanger use, diameter match.
P5 5Cr-0.5Mo Furnace Tube
SA-335 P5 seamless alloy tube, 160 mm OD, for pyrolysis furnace coils in ethylene crackers. Resists carburization. Under 7304.59.20.55 for refining furnace suitability.