SA-213 T92 Superheater Tube
High-strength T92 martensitic alloy steel seamless tube for superheaters in ultra-supercritical boilers, featuring 432 mm OD. Optimized for temperatures above 600°C with superior oxidation resistance. Classified in 7304.59.20.80 for its large diameter, seamless alloy steel construction suited for superheaters.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If stainless steel alloy like TP316H
Austenitic stainless alloys separate from ferritic/martensitic like T92; stainless defined by chromium ≥10.5% without titanium/aluminum stabilization.
If produced by electric resistance welding
Welding method changes heading from seamless (7304) to welded circular hollow sections (7307).
If not suitable for listed high-pressure applications
Other large OD seamless alloy tubes without boiler/heat exchanger certification fall under residual 7304.59.80.
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Import Tips & Compliance
• Include normalization + temper heat treatment certification; improper processing voids boiler code compliance
• Customs often requires proof of 'seamless' via ultrasonic testing reports to distinguish from welded ERW pipes
• Label with 'For Boiler Use Only' to support specific suitability; vague descriptions risk general tube classification
Related Products under HTS 7304.59.20.80
SA-213 TP347H Seamless Boiler Tube
Seamless tube made from TP347H stabilized austenitic stainless steel alloy, designed for high-temperature service in superheaters and boilers. It has an outside diameter of 457 mm, exceeding 406.4 mm, and meets ASME SA-213 specifications for pressure parts in power generation boilers. Classified under 7304.59.20.80 due to its seamless construction, alloy steel composition, circular cross-section, and suitability for boilers with large OD.
ASTM A335 P91 Large Diameter Boiler Pipe
Seamless Grade P91 chrome-moly alloy steel pipe for elevated-temperature service in refining furnaces and supercritical boilers, with 508 mm OD. It provides excellent creep resistance for high-pressure feedwater heaters. Falls under 7304.59.20.80 as other alloy steel seamless tubes over 406.4 mm OD suitable for boilers and refining furnaces.
P5 Alloy Seamless Refining Furnace Tube
ASTM A335 P5 (5Cr-0.5Mo) seamless tube, 419 mm OD, for transfer lines in petroleum refining furnaces. Withstands carburizing atmospheres at 650°C. HTS 7304.59.20.80 covers its alloy steel seamless design for refining furnaces exceeding 406.4 mm OD.
Grade 91 Condenser Repair Tube 16.5" OD
Replacement seamless P91 tube, 419.1 mm OD, for condenser water boxes in fossil fuel plants. Enhanced weldability for field repairs. 7304.59.20.80 due to large OD, alloy composition, and condenser suitability.
Alloy Steel Feedwater Heater Tube 18" OD
Seamless 457.2 mm (18-inch) OD tube from 2.25Cr-1Mo alloy steel for feedwater heaters in steam cycles. Corrosion-resistant U-bend configuration for heat exchange efficiency. Under 7304.59.20.80 as large-diameter seamless alloy tube explicitly for feedwater heaters.