U.S. imports of Large-Diameter Non-Longitudinally Welded Pipes & Tubes, Iron or Steel (Over 16 In.) (HS 730539) totaled $471K in August 2026, imported from 7 countries.
Importers of Large-Diameter Non-Longitudinally Welded Pipes & Tubes, Iron or Steel (Over 16 In.) paid $79K in duties in August 2026, an average duty rate of 16.80% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Large-Diameter Non-Longitudinally Welded Pipes & Tubes, Iron or Steel (Over 16 In.) imports of $471K in August 2026 ran 74% below the year-to-date monthly average of $1.8M.
Last updated: August 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.
11 import shipments a month
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.
Trade Directory
List your company under HS 730539 — Large-Diameter Non-Longitudinally Welded Pipes & Tubes, Iron or Steel (Over 16 In.), so the companies trading it can find you. Be the first supplier listed.
Subheading 5 of 7 in heading 7305
Subheading 730539 · $471K of $70.2M
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 7305391000 | Tubes, Pipes NESOI, Wld not Longit, Irn/Nal Stl | $365K | 0.00% | 100.00% | -- |
| 7305395000 | Tubes, Pipes NESOI, Wld not Longitud, Alloy St | $105K | 75.00% | 100.00% | $79K |
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 | $159K |
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
$471KYoY · free account
Exports
$159KYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $16.2M of Large-Diameter Non-Longitudinally Welded Pipes & Tubes, Iron or Steel (Over 16 In.) and exported $20.4M.
Fewer than 6 of the last 12 months reported trade, or the latest month was under $500K; the trend chart is not shown for thin series.
Through August 2026. Source: U.S. Census Bureau.
Imports · August 2026
origin
Vietnam and China together supply 82% of it. China pays 75.0% duty; Vietnam 0.0%.
customs district
destination
entry
rate provision · imports
duty collected equals 16.80% of imports for consumption.