Refinery Furnace Process Tube 4-inch
Seamless carbon steel tube, 101.6 mm outside diameter, designed for process lines and transfer lines in refinery furnaces. Manufactured from iron or non-alloy steel with a circular cross-section, it is classified under tariff item 7304.39.00 for other seamless tubes of this material.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | +50.0% | 50% |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the tube is made of stainless steel
Stainless steel seamless tubes are classified separately for corrosion-resistant alloys.
If the tube is made of other alloy steel
Alloy steel seamless tubes, other than stainless, fall under this subheading.
If the tube is welded rather than seamless
Welded tubes of iron or non-alloy steel are classified in heading 7306.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Provide documentation showing the tube's outside diameter (101.6 mm) is within the 38.1–190.5 mm range for this tariff item
• Ensure the steel is non-alloy by submitting a mill certificate
• Consider whether the tube's end use in a refinery affects any other regulatory requirements
Related Products under Tariff item 7304.39.00
125mm Steam Drum Tube
This is a large 125mm outside diameter seamless tube for steam drum risers in industrial boilers, connecting waterwall tubes to the steam drum in high-pressure systems. Its non-alloy steel composition and seamless circular construction qualify it under tariff item 7304.39.00, which covers other seamless tubes of iron or non-alloy steel with a circular cross-section.
50mm OD Boiler Economizer Tube
This is a seamless carbon steel economizer tube with a 50mm outside diameter, used for recovering waste heat in boiler stacks. Its non-alloy steel composition and seamless circular construction qualify it under tariff item 7304.39.00, which covers other seamless tubes of iron or non-alloy steel with a circular cross-section.
ASTM A106 Grade B Feedwater Heater Tube
This is a seamless A106 Grade B carbon steel tube with a 152.4mm outside diameter, used for feedwater heaters in steam cycles. Its non-alloy steel composition and seamless circular construction qualify it under tariff item 7304.39.00, which covers other seamless tubes of iron or non-alloy steel with a circular cross-section.
ASTM A179 Carbon Steel Boiler Tube
This is a seamless carbon steel tube designed for use in heat exchangers and boilers, with an outside diameter of 50mm, meeting ASTM A179 specifications for low-carbon steel suitable for bending and flanging. Its non-alloy steel composition and seamless circular construction qualify it under tariff item 7304.39.00, which covers other seamless tubes of iron or non-alloy steel with a circular cross-section.
ASTM A179 Carbon Steel Superheater Tube OD 19mm
This is a seamless cold-drawn carbon steel tube with a 19mm outside diameter, manufactured to ASTM A179 standards for use in superheater applications within power plants. Its non-alloy steel composition and circular seamless construction qualify it under tariff item 7304.39.00, which covers other seamless tubes and pipes of iron or non-alloy steel with a circular cross-section.
ASTM A210 Grade A1 Heat Exchanger Tube
This is a seamless medium-carbon steel tube manufactured to ASTM A210 Grade A1 specifications, with a 100mm outside diameter, for condenser and heat exchanger service in refining furnaces. Its non-alloy steel composition and seamless circular construction qualify it under tariff item 7304.39.00, which covers other seamless tubes of iron or non-alloy steel with a circular cross-section.