Seamless Steel Structural Hollow Section 16-inch OD 20mm Wall
Circular seamless hollow structural section (HSS) of nonalloy steel, 16-inch (406.4 mm but exceeding in variants) OD and 20 mm wall for building columns. HTS 7304.39.0080 applies to these large, thick-walled seamless profiles of circular cross-section. Used in high-rise construction.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If welded square/rectangular
Welded non-circular HSS classify under 7306.60 as other welded hollow profiles.
If pre-fabricated into trusses or frames
Assembled steel structures from pipes go to 7308.40 as equipment for scaffolding.
If welded circular casing
Welded versions for similar structural use fall under 7305 welded large-diameter pipes.
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Import Tips & Compliance
• Certify to ASTM A500 or A1085 for structural use; non-certified may face engineering rejection
• Measure wall precisely post-manufacture; thinning during production can drop below 19mm
• Declare as 'hollow profiles' if marketed for structures to align with notes
Related Products under HTS 7304.39.00.80
API 5L Grade B Seamless Steel Line Pipe 24-inch OD 25mm Wall
This seamless steel pipe of nonalloy steel has a 24-inch (609.6 mm) outside diameter and 25 mm wall thickness, designed for oil and gas pipeline transmission. It falls under HTS 7304.39.0080 due to its circular cross-section, seamless construction, outside diameter exceeding 406.4 mm, and wall thickness of 19 mm or more. Commonly used in high-pressure hydrocarbon transport.
ASTM A106 Grade B Seamless Boiler Tube 20-inch OD 30mm Wall
High-temperature seamless carbon steel tube conforming to ASTM A106 for boiler and superheater applications, with 20-inch (508 mm) OD and 30 mm wall thickness. Classified in HTS 7304.39.0080 for its seamless iron/nonalloy steel construction, circular profile exceeding 406.4 mm OD, and thick walls ≥19 mm. Ideal for pressure vessels in power plants.
Heavy Wall Seamless Steel Casing Pipe 18-inch OD 22mm Wall
Seamless nonalloy steel casing pipe for oil well drilling, 18-inch (457.2 mm) OD with 22 mm wall thickness, meeting API 5CT standards. Fits HTS 7304.39.0080 as a large-diameter, thick-walled seamless circular pipe of iron or nonalloy steel. Used to line boreholes and support well integrity.
Large Diameter Seamless Steel Pile Pipe 26-inch OD 35mm Wall
Seamless carbon steel pipe for offshore foundation piling, 26-inch (660.4 mm) OD and 35 mm thick walls, ASTM A252 Grade 3 compliant. Under HTS 7304.39.0080 for seamless nonalloy steel tubes with OD >406.4 mm and walls ≥19 mm. Essential for structural support in bridges and wind farms.
High-Pressure Seamless Steel Process Pipe 22-inch OD 28mm Wall
Seamless nonalloy steel pipe for chemical plant process lines, 22-inch (558.8 mm) OD with 28 mm wall thickness per ASTM A53. Classifies to HTS 7304.39.0080 as circular seamless pipe exceeding 406.4 mm OD with walls 19 mm or more. Handles corrosive fluids under high pressure.
Extra Heavy Seamless Steel Pipe for Pressure Vessels 30-inch OD 40mm Wall
Ultra-thick seamless carbon steel pipe for fabricating high-pressure storage vessels, 30-inch (762 mm) OD and 40 mm walls, ASME SA106 compliant. Fits HTS 7304.39.0080 criteria for seamless nonalloy steel pipes with OD >406.4 mm and walls ≥19 mm. Critical for LNG and reactor vessels.