Seamless Steel Duct Pipe for Ventilation
Large seamless non-alloy steel pipes for industrial HVAC ducting systems, OD >406.4 mm, wall thickness <19 mm. Classifies under HTS 7304.39.0076 as other seamless circular steel tubes. Used in heavy industrial air handling where welded seams undesirable.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If welded construction
Welded duct pipes of circular section fall under welded tube headings.
If shaped for specific building frameworks
Structural steel sections (not plain circular) classify under 7308.
If imported with integral fan housings
Complete air handling units classify as fans rather than component tubing.
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Import Tips & Compliance
• Specify 'not for pressure service' to avoid boiler tube scrutiny
• Cleanliness certificates important for air handling applications
• Consider drawback eligibility for re-export in construction projects
Related Products under HTS 7304.39.00.76
API 5L Grade B Seamless Steel Line Pipe
Large-diameter seamless steel pipe used for oil and gas pipelines, made from non-alloy steel with circular cross-section, outside diameter over 406.4 mm and wall thickness under 19 mm. It falls under HTS 7304.39.0076 as a seamless tube/pipe of iron or non-alloy steel, not suitable for boring into tubes. This classification applies to precision-formed hollow profiles for high-pressure fluid transport.
Large Diameter Seamless Steel Casing Pipe X52
Seamless steel casing for oil well drilling, non-alloy steel, circular cross-section exceeding 16 inches OD with wall thickness less than 19 mm. Classified under 7304.39.0076 for seamless tubes/pipes of iron/non-alloy steel not for boring. Used to line boreholes and protect against collapse in petroleum extraction.
Seamless Steel Structural Pipe ASTM A106
ASTM A106 Grade B seamless carbon steel pipe for structural support in construction, circular cross-section over 16 inches diameter, wall under 19 mm thick. Fits HTS 7304.39.0076 as other seamless pipes of non-alloy steel. Provides high tensile strength for frameworks and piling.
Extra-Large Seamless Boiler Tube SA-106
ASME SA-106 seamless carbon steel tubes for high-temperature boiler service, OD exceeding 406.4 mm, wall thickness <19 mm, non-alloy steel. Under HTS 7304.39.0076 as other seamless circular pipes. Designed for pressure and heat resistance in power generation.
Heavy Wall Seamless Steel Pile Pipe
Seamless non-alloy steel pipe for offshore piling foundations, circular cross-section >16" OD with wall <19 mm. HTS 7304.39.0076 covers these large seamless tubes for marine construction. Meets ASTM A252 Grade 3 for deep foundation support.
Large OD Seamless Steel Mechanical Tubing
Cold-finished seamless mechanical tubing from non-alloy steel, exceeding 16 inches OD with thin walls <19 mm for machinery frames. HTS 7304.39.0076 for other large seamless pipes. Precision tolerances for rotating equipment housings.