Alloy Steel Seamless Boiler Tube ASTM A335 P11
This seamless tube made from 1.25% chromium-molybdenum alloy steel (ASTM A335 P11 grade) is designed for high-pressure boiler applications, with a wall thickness exceeding 4 mm. It falls under HTS 7304.90.30.00 as a seamless tube of alloy steel with thick walls, suitable for elevated temperature service in power plants.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If made of carbon steel rather than alloy steel
Carbon steel seamless tubes with wall ≥4mm classify under 7304.19, excluding alloy compositions.
If welded instead of seamless
Welded alloy steel tubes shift to Chapter 73 heading 7306, regardless of wall thickness.
If imported as part of a complete boiler assembly
If supplied as a finished boiler component rather than tube stock, it may classify under machinery parts.
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Import Tips & Compliance
• Verify alloy steel composition meets ASTM A335 standards and obtain mill test certificates for customs valuation
• Ensure wall thickness documentation is precise, as thinner walls shift to 7304.19 or 7304.59
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