P22 Superheater Tube OD 28mm
Seamless P22 (2.25Cr-1Mo) alloy steel tube with 28 mm OD for superheaters in utility boilers. Engineered for prolonged exposure to steam at 500°C+. Classified in 7304.59.20.40 for alloy steel, circular seamless, small diameter, and superheater use.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If of other than alloy steel
Non-alloy steel versions use different subheadings even for identical end use.
If having OD 38.1-114.3 mm
Larger diameters have separate statistical breaks within boiler tubes.
If cut and machined for specific apparatus
Precision-finished for stoves/boilers shifts to fabricated steel products.
Not sure which classification is right?
Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.
Import Tips & Compliance
• Declare exact grade (e.g
• P22) and reference ASTM A335 to match HTS alloy steel definition
• Use protective caps on ends to prevent damage claims during import inspection
Related Products under HTS 7304.59.20.40
Alloy TP347H Boiler Tube OD 32mm
Seamless TP347H stabilized stainless alloy tube, 32 mm OD, for thick-walled boiler applications. Niobium stabilization prevents carbide precipitation in superheater service. 7304.59.20.40 for diameter and boiler suitability despite stainless alloy.
Alloy Steel Boiler Tube OD 25.4mm
Seamless tube made from alloy steel, with an outside diameter of 25.4 mm, designed specifically for use in high-pressure boilers. It meets standards for elevated temperature service in superheaters and heat exchangers due to its precise metallurgical composition. Classified under 7304.59.20.40 for its small diameter and boiler suitability.
SA-213 TP304 Boiler Tube OD 19mm
Seamless TP304 stainless alloy steel tube per ASME SA-213, outside diameter 19 mm, for superheaters and heat exchangers in power plants. Its corrosion resistance and strength at high temperatures qualify it for boiler applications. Fits 7304.59.20.40 due to diameter and specified end use.
T11 Alloy Heat Exchanger Tube OD 31.75mm
Seamless ASTM A335 Grade T11 alloy steel tube, OD 31.75 mm, optimized for condensers and feedwater heaters in refining furnaces. Low alloy content provides creep resistance under thermal stress. Under 7304.59.20.40 for small OD and heat exchanger suitability.
Alloy Steel Condenser Tube OD 22mm
Seamless alloy steel tube OD 22 mm for steam condensers in power generation plants. Provides excellent thermal conductivity and corrosion resistance in wet environments. Meets 7304.59.20.40 criteria: seamless, alloy, <38.1 mm OD, condenser-suitable.
T9 Feedwater Heater Tube OD 35mm
Seamless ASTM A213 T9 alloy steel tube, 35 mm OD, for feedwater heaters in thermal power stations. High chromium content resists oxidation in preheated water systems. 7304.59.20.40 applies to its small diameter and designated heater application.