Refinery Furnace Process Tube 4-inch
Seamless carbon steel tube 101.6 mm (4-inch) OD for refining furnace process lines and transfer lines. Meets 7304.39.0004 as suitable for refining furnaces, seamless iron/nonalloy steel, circular section 38.1-190.5 mm OD. Withstands high-temperature hydrocarbon service in oil refineries.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If statistical variations in wall thickness reporting
Different statistical suffixes capture manufacturing variations.
If stainless steel for corrosion resistance
Corrosive environments require stainless, changing to heading 7307.
If installed in complete furnace equipment
Part of imported drying ovens/furnaces classifies with machinery.
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Import Tips & Compliance
• Provide elevated temperature tensile test data proving refinery furnace suitability
• Include API or refinery specification references in commercial invoice
• Avoid classification as general structural tubing under 7306.60
Related Products under HTS 7304.39.00.04
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ASTM A179 Carbon Steel Boiler Tube
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SA-192 High-Pressure Boiler Tube
Seamless carbon steel tube per ASME SA-192 for high-pressure boilers, featuring 75 mm OD and wall thickness for superheater applications. Classified in 7304.39.0004 for its seamless iron/nonalloy steel construction suitable for boilers and superheaters within the specified diameter range. Essential for power generation and industrial steam systems.
ASTM A210 Grade A1 Heat Exchanger Tube
Seamless medium-carbon steel tube ASTM A210 Gr.A1 with 100 mm OD for condenser and heat exchanger service in refining furnaces. Meets HTS 7304.39.0004 criteria as nonalloy seamless tube of circular section suitable for heat exchangers with diameter 38.1-190.5 mm. Used in petrochemical plants for efficient heat transfer.
Carbon Steel Superheater Tube 2-inch Schedule 40
Schedule 40 seamless carbon steel tube, 60.3 mm (2-inch nominal) OD for superheaters in utility boilers. Fits HTS 7304.39.0004 precisely as iron/nonalloy seamless tube suitable for superheaters in the specified diameter range. Critical for raising steam temperature in power plants.
ASTM A106 Grade B Feedwater Heater Tube
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