SA-335 P11 Alloy Steel Boiler Tube
ASME SA-335 Grade P11 seamless alloy steel tube with 50mm OD and 15mm wall thickness for high-temperature boiler service. Classified under HTS 7304.59.80.25 for its seamless alloy steel construction, circular cross-section, and wall thickness over 12.7mm. Commonly used in power plants for superheater and reheater applications.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If cold-drawn or otherwise worked
Finished precision tubes may qualify for cold-worked provisions in 7304.51.
If imported as boiler parts
If specifically shaped for boiler function, may classify as parts of boilers rather than tubes.
If wall thickness ≤12.7mm
Thinner wall versions fall into separate statistical breakout within the same subheading.
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Import Tips & Compliance
• Include ASME material certification and heat treatment records to substantiate boiler tube classification
• Declare exact grade (P11, P22, etc.) as it affects alloy content verification during customs exam
• Watch for inadvertent classification as carbon steel (7304.39) due to insufficient chromium/molybdenum documentation
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