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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If standard carbon steel versions
Lower cost carbon steel feedwater tubes use non-stainless classification 7304.41.
If other alloy steel, cold-drawn
Different alloy compositions or finishes move to 7304.59 statistical categories.
If imported as boiler subassembly parts
Parts of complete boilers classify under 8402 rather than standalone tubes.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Certification of titanium stabilization essential for TP321 to prevent weld decay in heater service
• Include design pressure/temperature ratings matching feedwater heater specs (typically 100-200 bar)
Related Products 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.