Standard International Trade Classification
U.S. imports of Large-Diameter Welded Iron & Steel Line Pipe for Oil & Gas Pipelines (OD Over 406.4 mm) (SITC 67931) totaled $61.6M in August 2026, imported from 19 countries.
Importers of Large-Diameter Welded Iron & Steel Line Pipe for Oil & Gas Pipelines (OD Over 406.4 mm) paid $19.2M in duties in August 2026, an average duty rate of 32.16% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Large-Diameter Welded Iron & Steel Line Pipe for Oil & Gas Pipelines (OD Over 406.4 mm) imports of $61.6M in August 2026 ran 30% above the year-to-date monthly average of $47.3M.
Last updated: August 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.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
406 import shipments a month
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.
Basic heading 101 of 766 in section 6
Basic heading 67931 · $61.6M of $27.0B
Trade Directory
List your company and tag the 6-digit products you trade, so the companies trading them can find you. Be the first supplier listed.
Imports · August 2026
origin
Turkey and South Korea together supply 81% of it. Brazil pays 50.0% duty; Turkey 5.5%.
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
$61.6MYoY · free account
Exports
$508KYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $619.9M of Large-Diameter Welded Iron & Steel Line Pipe for Oil & Gas Pipelines (OD Over 406.4 mm) and exported $17.7M.
Through August 2026. Source: U.S. Census Bureau.