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HSChapter 73
U.S. exports of large-diameter non-longitudinally welded pipes & tubes, iron or steel (over 16 in.) (HS 730539) totaled $486K in July 2026.
Importers of Large-Diameter Non-Longitudinally Welded Pipes & Tubes, Iron or Steel (Over 16 In.) paid $116K in duties in July 2026 — an effective duty rate of 32% on $356K in dutiable value, based on actual customs collections rather than the published tariff schedule. Large-Diameter Non-Longitudinally Welded Pipes & Tubes, Iron or Steel (Over 16 In.) imports of $356K in July 2026 ran 82% below the year-to-date monthly average of $2.0M.
Last updated: July 2026 dataSpiral-welded and other non-longitudinally welded large-diameter pipes — those with external diameters exceeding 406.4 mm — are widely used in water infrastructure, piling, and energy transmission projects where helical seam construction offers manufacturing flexibility for very large diameters. These products are subject to Section 232 tariffs, and imports from China are also potentially subject to Section 301 measures, making origin documentation especially consequential. Turkey and Vietnam are the leading suppliers to the US under this heading, followed by China, South Korea, and India.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
14 shipments/mo
Because China is among the top suppliers under this heading, imports of Chinese-origin large-diameter welded pipe may be subject to both Section 232 steel tariffs and Section 301 tariffs simultaneously. Additionally, antidumping and countervailing duty orders on certain welded pipe from specific countries may apply, so a thorough admissibility and duty-order check by origin is essential before entry.
Mill test reports and manufacturing process certifications typically identify the weld seam orientation. For spiral or helical-welded pipe, the seam angle relative to the pipe axis is the defining characteristic. Importers should obtain and retain these technical documents from the foreign manufacturer to support classification under 730539 versus 730531.
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HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 7305391000 | Tubes, Pipes NESOI, Wld not Longit, Irn/Nal Stl | $282K | 21.40% | 100.00% | $60K |
| 7305395000 | Tubes, Pipes NESOI, Wld not Longitud, Alloy St | $74K | 75.00% | 100.00% | $55K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 7305395000 | Tubes, Pipes NESOI, Wld not Longitud, Alloy St | $470K |
| 7305391000 | Tubes, Pipes NESOI, Wld not Longit, Irn/Nal Stl | $16K |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
ImportsExports
Imports
$356KYoY · Pro
Exports
$486KYoY · Pro
12-mo low · imports
YoY · ProFewer than 6 of the last 12 months reported trade above $500K; the trend chart is not shown for thin series.
Through July 2026. Source: U.S. Census Bureau.
Exports · July 2026
destination
Mexico and Canada together take 95% of it.
customs district
origin
entry
rate provision · imports
the effective duty rate is 32.49%.