U.S. imports of Large-Diameter Line Pipe, Longitudinally Submerged Arc Welded, Over 406.4 mm (HS 730511) totaled $41.9M in August 2026, imported from 14 countries.
Importers of Large-Diameter Line Pipe, Longitudinally Submerged Arc Welded, Over 406.4 mm paid $9.5M in duties in August 2026, an average duty rate of 23.68% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Large-Diameter Line Pipe, Longitudinally Submerged Arc Welded, Over 406.4 mm imports of $41.9M in August 2026 ran 65% above the year-to-date monthly average of $25.5M.
Last updated: August 2026 dataLongitudinally submerged arc welded (LSAW) line pipe with external diameters exceeding 406.4 mm (16 inches) is engineered specifically for high-pressure oil and gas transmission pipelines, where weld integrity and dimensional consistency over long runs are critical to pipeline safety standards. Germany and Greece are notable European sources under this heading, with South Korea also a significant supplier. The US schedule distinguishes nonalloy steel pipe by diameter bracket — 406.4–609.6 mm (7305111030) and over 609.6 mm (7305111060) — from alloy steel LSAW pipe (7305115000). These products are subject to Section 232 tariffs, and importers should verify compliance with API 5L or equivalent pipeline specifications as part of entry documentation.
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283 import shipments a month
Most large-diameter LSAW line pipe for oil and gas service must meet API Specification 5L, which covers chemical composition, mechanical properties, weld quality, and hydrostatic testing. Buyers and importers should require mill test reports and API monogram documentation from the foreign producer. Some pipeline operators also impose supplementary requirements (SR) beyond the base API 5L standard, which must be agreed upon in the purchase order and verified before shipment.
Heading 730511 is specifically limited to longitudinally submerged arc welded pipe — meaning the weld seam runs parallel to the pipe axis and is made by the SAW process. Spiral (helical) welded pipe, where the seam runs at an angle to the axis, classifies under heading 730520. Other longitudinally welded methods (e.g., high-frequency induction welding) fall under heading 730512. The welding process and seam orientation must be confirmed with the mill to ensure correct classification.
Trade Directory
List your company under HS 730511 — Large-Diameter Line Pipe, Longitudinally Submerged Arc Welded, Over 406.4 mm, so the companies trading it can find you. Be the first supplier listed.
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 |
|---|---|---|---|---|---|
| 7305111060 | Lnpipe Iron/Stl Longt Sbmrg Arc Weld, Diam Gt 609.6 | $36.3M | 21.84% | 99.47% | $7.9M |
| 7305115000 | Lnpip Alloy/Stl Longtd Sbmerge Arc Weld, Gt 406.4mm | $3.1M | 48.53% | 99.08% | $1.5M |
| 7305111030 | Oil Lnepipe Iron/Stl Longitudnly Submrged Arc Weld | $702K | 9.35% | 97.36% | $66K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 7305115000 | Lnpip Alloy/Stl Longtd Sbmerge Arc Weld, Gt 406.4mm | $178K |
| 7305111000 | Ln Pp Ios Na Lngtd Sbm Arc Wld Diam 0406.4mm Circ | $81K |
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
$41.9MYoY · free account
Exports
$258KYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $393.1M of Large-Diameter Line Pipe, Longitudinally Submerged Arc Welded, Over 406.4 mm and exported $14.6M.
Through August 2026. Source: U.S. Census Bureau.
Imports · August 2026
origin
Turkey and Brazil together supply 82% of it. Brazil pays 50.0% duty; Turkey 5.5%.
customs district
destination
rate provision · imports
duty collected equals 23.68% of imports for consumption.
Subheading 1 of 7 in heading 7305
Subheading 730511 · $41.9M of $70.2M