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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If other alloy steel not for high-pressure equipment
General large OD alloy tubes without specific boiler/refining suitability go to 7304.19.50.
If other welded alloy steel pipe
Welded construction excludes from seamless heading 7304, moving to 7307.99 regardless of alloy.
If square or other non-circular cross-section
Circular cross-section requirement; non-circular hollow profiles classify under 7304.59.60.
Not sure which classification is right?
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Import Tips & Compliance
• Certify minimum wall thickness for furnace tube collapse pressure; customs audits high-pressure claims
• Distinguish from boiler tubes via end-use letters from buyer specifying refining application
• Package in wooden crates with moisture protection; corrosion claims common in transit disputes
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.
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.
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.