Superheater Seamless Alloy Tube 13.5-inch OD
High-temperature seamless tube of Grade T91 alloy steel, 342 mm OD and 7 mm wall thickness, for superheater sections in fossil fuel boilers. HTS 7304.59.80.60 applies to its seamless alloy steel construction, mid-range OD, and thin walls optimizing heat transfer. Meets rigorous creep strength requirements.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If electroplated or coated post-forming
Surface treatments classify as 'other worked' tubes under 7307.29.
If carbon steel equivalent for same application
Non-alloy versions use 7304.19 with different duty structure.
If fitted for specific boiler assemblies
Pre-bent/fitted tubes become boiler parts under Chapter 84.
Not sure which classification is right?
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Import Tips & Compliance
• Certify normalized-and-tempered condition per ASME specs for proper alloy tube status
• Document wall uniformity via ultrasonic testing reports for customs inspection
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