HS Code for Steel Square Tubes
The HS Code for steel square tubes is 730661. The MFN duty rate for importing to the US is Free.
| HS Code (6-digit) | 730661 |
|---|---|
| US Duty Rate (MFN) | Free |
| EU Duty Rate (MFN) | 0% |
| Chapter | 73 |
| Heading | 7306 |
| Last Updated | 2026-05 |
Description
Welded tubes and pipes of square or rectangular cross-section, of iron or steel
HS Code 730661 covers welded square or rectangular iron or steel tubes with a US MFN duty rate of Free.
Frequently Asked Questions
Does the type of steel alloy or the use of a specific manufacturing process affect the classification of welded square steel tubes under HTS 730661?
For classification under HTS 730661, the primary determinants are that the tubes are welded and have a square or rectangular cross-section; the specific steel alloy (e.g., carbon steel vs. stainless steel) generally does not change this classification. However, the manufacturing process must be welding (e.g., ERW, laser, etc.), as seamless square tubes are excluded and classified elsewhere under heading 7306.
What are the specific customs inspection risks for importing steel square tubes under HTS 730661?
Shipments of steel square tubes under this code are frequently targeted for anti-dumping and countervailing duty (AD/CVD) enforcement. Inspectors will verify the country of origin and mill certificates to ensure correct steel composition and proper classification, as many steel products from specific countries are subject to high duty orders. Accurate reporting of dimensions, wall thickness, and whether they are galvanized or painted is critical to avoid detention and penalties.
What additional duties or fees, beyond the base rate, apply when importing welded steel square tubes under HTS 730661 into the United States?
Imports of steel square tubes under HTS 730661 are subject to Section 232 tariffs of 25% on top of the general Most-Favored-Nation (MFN) duty rate, which is often 0% for this classification. Furthermore, shipments may incur Merchandise Processing Fees (MPF) and Harbor Maintenance Fees (HMF) based on the entered value and shipment volume.
Material Variants: Steel Grade & Composition
Classification under 730661 requires the tubes to be of iron or non-alloy steel, meaning they cannot contain specific minimum percentages of alloying elements like chromium, nickel, or molybdenum. If the steel contains these elements above specified thresholds, the tubes may be classified as alloy steel under heading 7306.6, such as 730669 for other alloy steel tubes. The key distinction is the material specification; common non-alloy grades like ASTM A500 Gr A/B or S235/S355 typically remain here, while grades like ASTM A513 (alloy) would not. Always verify the mill test certificate for the exact chemical composition to confirm the correct heading.
Similar and Confused HS Codes
Steel square tubes are most precisely classified under 7306.61. However, they are often confused with other hollow profiles. Key alternatives include 7306.60 for 'other' hollow profiles (e.g., triangular, octagonal) and 7306.30 for circular tubes of similar dimensions. Crucially, ensure the product is welded (7306) and not seamless (7304.59.60 for square seamless tubes). Also, verify the steel alloy; tubes of stainless steel fall under a different heading (7306.40).
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