SA-335 P11 Seamless Superheater Tube
Seamless low-alloy steel tube grade P11 (1.25% chromium, 0.5% molybdenum) with 12-inch (304.8 mm) OD, engineered for superheaters in power generation boilers. Classified under HTS 7304.59.20.70 for its alloy steel makeup, boiler suitability, and specified diameter range.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If ferritic stainless steel alloy
Ferritic stainless alloys classify under cold-drawn ferritic stainless subheading 7304.51, separate from other alloy steels like P11.
If OD exceeding 406.4 mm
Larger diameters over 406.4 mm fall into separate statistical suffixes within 7304.39 for other alloy steel tubes.
If for use in refining furnaces as machinery parts
If dedicated solely to refining furnace equipment and imported as such, it may classify as parts of unspecified machinery rather than generic tubes.
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Import Tips & Compliance
• Provide ASME certification and hydrostatic test results to prove boiler suitability; watch for alloy content thresholds to prevent shift to carbon steel headings; use precise OD caliper measurements for customs declaration
Related Products under HTS 7304.59.20.70
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P91 modified martensitic alloy seamless tube, 324.9 mm OD for feedwater heaters. Classified HTS 7304.59.20.70 for feedwater heater use, alloy steel, seamless, OD compliant.
SA-213 TP304 Seamless Boiler Tube
Seamless tube made from TP304 austenitic stainless steel alloy, with an outside diameter of 355.6 mm (14 inches), designed specifically for high-pressure boiler applications. It falls under HTS 7304.59.20.70 due to its seamless construction, circular cross-section, alloy steel composition, and suitability for use in boilers, with OD between 285.8 mm and 406.4 mm.
SA-213 TP316L Heat Exchanger Tube
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SA-335 P22 Feedwater Heater Tube
High-temperature P22 alloy steel (2.25% Cr, 1% Mo) seamless tube, 13.5-inch (342.9 mm) OD, for feedwater heaters in steam cycles. Fits HTS 7304.59.20.70 as seamless other alloy steel tube for feedwater heaters, OD 285.8-406.4 mm.
SA-213 T9 Condenser Alloy Tube
T9 grade (9% chromium) seamless alloy steel tube with 11.5-inch (292.1 mm) OD for condensers in fossil fuel plants. HTS 7304.59.20.70 applies for its seamless, circular, condenser-suited design in other alloy steel, precise OD range.
P5 Alloy Seamless Refining Furnace Tube
ASME SA-335 P5 (5% Cr, 0.5% Mo) seamless tube, 14-inch (355.6 mm) OD, for refining furnace tubing in petrochemical refineries. Classified in HTS 7304.59.20.70 for refining furnace suitability, alloy steel, seamless, 285.8-406.4 mm OD.