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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If of carbon steel rather than alloy
Carbon steel seamless tubes (less than 0.2% alloy elements) fall under 7304.51, excluding alloy steel.
If OD between 60.3 mm and 114.3 mm
Precise OD ranges dictate subheadings within suitable-for-boiler tubes.
If supplied as components in boiler sets
Tubes sold as part of complete boiler assemblies classify under boiler parts heading.
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Import Tips & Compliance
• Confirm normalizing/tempering heat treatment per ASTM A335; include dimensional inspection reports
• Avoid pitfall of bulk packaging misclassified as scrap metal
Related Products 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.