Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters, whether or not cold-drawn
Other tubes, pipes and hollow profiles (for example, open seamed or welded, riveted or similarly closed), of iron or steel: > Other, welded, of circular cross section, of stainless steel: > Having a wall thickness of 1.65 mm or more > Other: > Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters, whether or not cold-drawn
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 7306.40.50.15
Welded 304 Stainless Steel Boiler Tube
These welded stainless steel tubes with circular cross-section and wall thickness over 1.65 mm are designed specifically for use in high-pressure boilers. Made from 304 grade stainless steel, they resist corrosion and high temperatures in steam generation systems. Classified under HTS 7306.40.50.15 due to their welded construction and suitability for boilers.
Cold-Drawn 316L Stainless Steel Heat Exchanger Tube
Cold-drawn welded tubes of 316L stainless steel with wall thickness of at least 1.65 mm, optimized for heat exchanger applications in chemical processing. The enhanced molybdenum content provides superior corrosion resistance in aggressive environments. Fits HTS 7306.40.50.15 for welded stainless tubes suitable for heat exchangers.
Welded 304H Stainless Superheater Tube
High-temperature resistant welded 304H stainless steel tubes with thick walls (≥1.65 mm) for superheater sections in power plant boilers. The stabilized composition prevents carbide precipitation during prolonged heat exposure. HTS 7306.40.50.15 applies to these welded stainless tubes designated for superheaters.
Duplex 2205 Stainless Condenser Tube
Welded duplex 2205 stainless steel tubes featuring high strength and corrosion resistance, with wall thickness over 1.65 mm for condenser applications in power plants. Ideal for handling cooling water with chloride content. Classified in HTS 7306.40.50.15 as welded stainless tubes for condensers.
317L Stainless Steel Feedwater Heater Tube
Corrosion-resistant welded 317L stainless tubes with thick walls for feedwater heaters in steam cycles, preventing stress corrosion cracking. The higher molybdenum content enhances pitting resistance. Meets HTS 7306.40.50.15 criteria for welded stainless tubes in feedwater heaters.
310S Stainless Refining Furnace Tube
High oxidation resistance welded 310S stainless steel tubes for petroleum refining furnace applications, featuring wall thickness ≥1.65 mm to withstand carburizing atmospheres. Provides excellent creep strength at elevated temperatures. HTS 7306.40.50.15 covers these welded stainless tubes for refining furnaces.
304 Stainless Steel U-Tube for Condensers
Pre-formed U-bent welded 304 stainless steel tubes with heavy walls for surface condenser tube bundles in marine and power applications. The U-shape facilitates thermal expansion. Classified under HTS 7306.40.50.15 as suitable for condensers despite bending.
316Ti Stabilized Boiler Tube
Titanium-stabilized 316Ti welded stainless tubes with thick walls for boiler applications requiring resistance to intergranular corrosion after welding. Used in high-purity steam systems. Fits HTS 7306.40.50.15 for boiler-suitable welded stainless tubes.
321 Stabilized Stainless Superheater Tube
Titanium-stabilized 321 stainless welded tubes designed for superheater service in fossil fuel boilers, with wall thickness exceeding 1.65 mm. Prevents sensitization during high-temperature exposure. HTS 7306.40.50.15 designation for superheater applications.
Alloy 825 Heat Exchanger Tube
Welded nickel-iron-chromium alloy 825 tubes (stainless steel per tariff definition) with heavy walls for severe corrosive heat exchanger service in chemical plants. Excellent resistance to sulfuric acid. Classified HTS 7306.40.50.15 for heat exchanger use.
304L Low Carbon Condenser Water Tube
Low-carbon 304L welded stainless tubes for condenser cooling water service, featuring thick walls to resist pitting from seawater. Improved weldability over 304 grade. HTS 7306.40.50.15 for condenser-suitable stainless tubes.
316LMN Improved Stainless Boiler Tube
Enhanced 316LMN stainless welded tubes with higher molybdenum for boiler economizer sections, wall thickness ≥1.65 mm. Superior pitting resistance in flue gas condensates. Fits HTS 7306.40.50.15 boiler tube classification.
347H Stainless Refining Furnace Tube
Niobium-stabilized 347H welded stainless tubes for high-temperature refining furnace convection sections, thick-walled construction. Creep and corrosion resistant. HTS 7306.40.50.15 for refining furnace applications.
AL-6XN Super Austenitic Heat Exchanger Tube
Super austenitic AL-6XN welded stainless tubes for extreme corrosion heat exchangers, wall ≥1.65 mm. High PREN for halide service. Classified HTS 7306.40.50.15 heat exchanger tubes.
304 Stainless Steel Multi-Lead Condenser Tube
Welded 304 stainless tubes with integral multi-lead fins for enhanced condenser heat transfer, thick base wall ≥1.65 mm. Low-fin surface increases efficiency. HTS 7306.40.50.15 despite fins, as base tube classification governs.