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SITCSection 6
U.S. imports of large-diameter welded iron & steel line pipe for oil & gas pipelines (od over 406.4 mm) (SITC 67931) totaled $41.6M in April 2026, traded with 14 countries.
Importers of Large-Diameter Welded Iron & Steel Line Pipe for Oil & Gas Pipelines (OD Over 406.4 mm) paid $15.2M in duties in April 2026 — an effective duty rate of 41% on $37.5M in dutiable value, based on actual customs collections rather than the published tariff schedule. Large-Diameter Welded Iron & Steel Line Pipe for Oil & Gas Pipelines (OD Over 406.4 mm) imports of $41.6M in April 2026 ran 40% above the year-to-date monthly average of $29.7M.
Last updated: April 2026 dataLarge-diameter welded line pipe — with an external diameter exceeding 406.4 mm (16 inches) — is a primary structural input for long-distance oil and gas transmission infrastructure, where wall thickness, yield strength, and weld quality are specified to API 5L or equivalent standards. The size threshold of 406.4 mm is the defining classification boundary separating this subheading from smaller-diameter line pipe provisions. These products have been subject to antidumping and countervailing duty investigations from multiple origins, and Section 232 tariff measures also apply, making origin and production-method documentation critical at entry.
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API Specification 5L is the dominant standard for line pipe used in pipeline transportation systems. It defines grade designations (e.g., X52, X65, X70), seam types, and testing requirements. Importers should ensure that mill documentation references the applicable API 5L grade and that the product's external diameter is confirmed above 406.4 mm to support classification here rather than in a smaller-diameter provision.
Yes, large-diameter welded line pipe from several origins has been subject to antidumping and countervailing duty orders in the US. Importers should query the CBP ADD/CVD portal and the USITC order database before entry to confirm whether orders are active for the specific country of origin, as scope and suspension agreements can change.
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| Country | Imports | Exports | Balance |
|---|---|---|---|
| KOREA, SOUTH | $15.3M | -- | -$15.3M |
| TURKEY | $12.5M | -- | -$12.5M |
| GREECE | $6.7M | -- | -$6.7M |
| MEXICO | $2.1M | -- | -$2.1M |
| UNITED KINGDOM | $1.9M | $50K | -$1.8M |
Monthly import values over time