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SITCSection 6
U.S. imports of large-diameter welded iron & steel tubes & pipes (nes, od over 406.4 mm) (SITC 67933) totaled $11.4M in April 2026, traded with 13 countries.
Importers of Large-Diameter Welded Iron & Steel Tubes & Pipes (NES, OD Over 406.4 mm) paid $3.2M in duties in April 2026 — an effective duty rate of 31% on $10.4M in dutiable value, based on actual customs collections rather than the published tariff schedule. Large-Diameter Welded Iron & Steel Tubes & Pipes (NES, OD Over 406.4 mm) imports of $11.4M in April 2026 ran 36% above the year-to-date monthly average of $8.4M.
Last updated: April 2026 dataWelded iron and steel tubes and pipes with an external diameter exceeding 406.4 mm that are not classified as line pipe or OCTG fall into this residual large-diameter category, covering structural piling, water transmission, and industrial pressure applications. The NES designation requires importers to confirm that the product's end-use and specifications do not align with the dedicated line pipe or casing subheadings before using this classification. Section 232 tariff measures apply, and the large-diameter threshold of 406.4 mm is a hard dimensional boundary that should be verified against the mill's dimensional report.
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Products such as structural piling, water-main pipe, and industrial pressure vessels that exceed 406.4 mm OD but are not manufactured or certified to API 5L line pipe standards typically fall here. The absence of a pipeline-service certification or the presence of a structural or water-service specification is often the distinguishing factor.
The threshold applies to the external diameter. Importers should confirm the OD measurement on the mill certificate, as wall thickness variations can cause confusion. A product with an OD at or below 406.4 mm would fall under a different, smaller-diameter subheading even if its internal diameter is close to the threshold.
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| Country | Imports | Exports | Balance |
|---|---|---|---|
| KOREA, SOUTH | $4.5M | -- | -$4.5M |
| CANADA | $460K | $3.6M | +$3.2M |
| VIETNAM | $2.1M | -- | -$2.1M |
| INDIA | $1.6M | -- | -$1.6M |
| GERMANY | $1.3M | -- | -$1.3M |
Monthly import values over time