Welded Alloy Steel Square Hollow Section
ERW welded square hollow structural section (HSS) from alloy steel grades like A500 or A513, used in construction frameworks and machine bases. Fits 7306.90.5000 as other hollow profiles of alloy steel, distinct from circular pipes.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If stainless steel rectangular
Stainless hollow sections have dedicated subheadings separate from general alloy steel.
If over 16mm wall thickness
Thicker-walled structures may classify as fabricated steel articles, not tubes/pipes.
If cast iron alloy
Cast hollow profiles use Chapter 73 iron castings headings.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Provide welding process certification (ERW vs spiral) and yield strength data for structural compliance
• Declare cross-sectional shape and wall thickness accurately to differentiate from Chapter 73 bars
• Avoid undervaluation by specifying alloy premium over base steel pricing
Related Products under HTS 7306.90.50.00
Chrome-Moly P91 Alloy Boiler Tube
High-temperature P91 (9Cr-1Mo) alloy steel tube for supercritical boiler superheaters and reheaters. Classifies in 7306.90.5000 as other alloy steel tubes, excluding line pipe or casing applications.
17-4PH Stainless Alloy Steel Hollow Bar
Precipitation-hardened 17-4PH stainless alloy steel hollow bar, machined from tube for valve bodies and pump shafts. 7306.90.5000 covers this as other alloy steel hollow profiles with wire dimensions under 16mm max.
Alloy Steel Scaffolding Pipe Adapter Tube
Short adapter tubes from high-strength alloy steel connecting standard scaffolding pipes. Classified 7306.90.5000 as other welded alloy steel tubes for construction equipment.
Nitrided Alloy Steel Mandrel Bar Tube
Surface-nitrided 4340 alloy steel hollow mandrel bars used in tube drawing operations. 7306.90.5000 for specialized alloy steel hollow profiles in metalworking.
High-Pressure Alloy Steel Accumulator Shell
Cylindrical shells from 4340 or 300M alloy steel for hydraulic accumulators storing pressurized fluid. 7306.90.5000 applies to these welded or seamless pressure vessels under tube dimensions.
Alloy Steel Heat Exchanger Tubing
U-bent or straight tubes from Alloy 800H/825 for shell-and-tube heat exchangers in chemical processing. Classified 7306.90.5000 as other alloy steel tubes excluding boiler/precision types.