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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 $78.9M in July 2026, traded with 17 countries.
Importers of Large-Diameter Welded Iron & Steel Line Pipe for Oil & Gas Pipelines (OD Over 406.4 mm) paid $27.7M in duties in July 2026 — an effective duty rate of 35% on $78.6M 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 $78.9M in July 2026 ran 75% above the year-to-date monthly average of $45.2M.
Basic heading 79 of 766 in section 6
Basic heading 67931 · $78.9M of $26.7B
Large-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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404 shipments/mo
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.
Supplier Network
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Imports · July 2026
origin
Korea, South and Greece together supply 71% of it.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$78.9MYoY · Pro
Exports
$1.4MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.