ASME SA-335 P11 Seamless Superheater Tube
SA-335 P11 grade seamless alloy steel tubes are used in fossil fuel power plant superheaters for steam generation at extreme temperatures. The 1.25% chromium-molybdenum composition ensures creep resistance in boiler environments. Qualifies for 7304.59.20 as seamless, circular alloy steel tubes for superheaters.
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More Specific Codes
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If cold-drawn and under 16mm OD
Smaller diameter cold-drawn tubes for boilers may fall under specific cold-formed provisions.
If threaded or welded ends
Any welding or threading disqualifies from seamless classification, moving to Chapter 73 pipe fittings.
If imported as integral machinery parts
If tubes are machined with specific fittings for refining furnaces, they classify by machinery function.
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Import Tips & Compliance
• Provide NDT (non-destructive testing) reports mandatory for superheater applications under boiler codes
• Declare exact outer diameter and wall thickness to confirm circular tube status vs. pipe
Related Products under HTS 7304.59.20
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This seamless tube made from TP304 stainless alloy steel is designed specifically for high-pressure boilers and superheaters, meeting ASME SA-213 specifications. It features a circular cross-section and is cold-drawn for superior strength and corrosion resistance in elevated temperature environments. Classified under 7304.59.20 due to its seamless construction from alloy steel and suitability for boiler applications.
T304 Stainless Condenser Tube for Feedwater Heaters
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