Grade T91 Superheater Seamless Tube
Advanced T91 (9% Cr, 1% Mo, V-modified) seamless alloy tube, 15.75-inch (400 mm) OD for modern ultra-supercritical superheaters. Meets HTS 7304.59.20.70 as other alloy steel, seamless, superheater-suited, within OD limits.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If electric resistance welded (ERW)
ERW process changes from seamless 7304 to welded other steel pipes in 7306.50 for boiler use.
If components for turbojet test equipment
Specialized boiler-related machinery parts may classify under gas turbine parts if end-use specified.
Not sure which classification is right?
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Import Tips & Compliance
• Normalize and temper heat treatment certs mandatory; verify no wire drawing (per chapter note); declare as 'other alloy' to avoid stainless misclass
Related Products under HTS 7304.59.20.70
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Seamless tube made from TP304 austenitic stainless steel alloy, with an outside diameter of 355.6 mm (14 inches), designed specifically for high-pressure boiler applications. It falls under HTS 7304.59.20.70 due to its seamless construction, circular cross-section, alloy steel composition, and suitability for use in boilers, with OD between 285.8 mm and 406.4 mm.
SA-335 P11 Seamless Superheater Tube
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SA-213 TP316L Heat Exchanger Tube
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SA-335 P22 Feedwater Heater Tube
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SA-213 T9 Condenser Alloy Tube
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