Harmonized System
U.S. imports of Large-Diameter Line Pipe, Longitudinally Welded (Other Methods), Over 406.4 mm (HS 730512) totaled $19.7M in August 2026, imported from 11 countries.
Importers of Large-Diameter Line Pipe, Longitudinally Welded (Other Methods), Over 406.4 mm paid $9.7M in duties in August 2026, an average duty rate of 49.43% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 2026 dataLarge-diameter line pipe welded longitudinally by methods other than submerged arc welding — including high-frequency induction and electric resistance welding — covers the same 406.4 mm-and-over diameter range as heading 730511 but reflects different production technology and, often, different wall-thickness capabilities. South Korea and Germany are the leading suppliers, with Canada and Mexico also significant sources for North American pipeline projects. The US schedule mirrors 730511 in its diameter and alloy-type breakouts: nonalloy steel pipe in the 406.4–609.6 mm range (7305121030), over 609.6 mm (7305121060), and alloy steel (7305125000). Section 232 tariffs apply, and API 5L compliance documentation is standard for pipeline service entry.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
122 import shipments a month
Heading 730512 captures longitudinally welded large-diameter pipe made by any process other than submerged arc welding — most commonly high-frequency induction (HFI) welding and electric resistance welding (ERW). These processes are typically used for thinner-wall pipe in the lower end of the large-diameter range. Importers should obtain mill documentation specifying the welding process to distinguish 730511 (SAW) from 730512 (other longitudinal weld) entries.
North American sourcing from Canada and Mexico can reduce Section 232 exposure risk depending on current trade measures and applicable exclusions, and proximity shortens lead times for large, heavy pipe that is expensive to ship. However, domestic content requirements in certain federally funded infrastructure projects may impose additional Buy America or Buy American Act compliance obligations beyond standard customs requirements, which importers and project owners should evaluate separately from HTS classification.
Subheading 2 of 7 in heading 7305
Subheading 730512 · $19.7M of $70.2M
ImportsExports
Imports
$19.7MYoY · free account
Exports
$25KYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $226.3M of Large-Diameter Line Pipe, Longitudinally Welded (Other Methods), Over 406.4 mm and exported $758K.
Through August 2026 · exports 11 of 12 months reported. Source: U.S. Census Bureau.
Trade Directory
List your company under HS 730512 — Large-Diameter Line Pipe, Longitudinally Welded (Other Methods), 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 |
|---|---|---|---|---|---|
| 7305121030 | Lnpipe Iron/Stl Longtd Weld,406.4mm-609.6mm Diam | $19.7M | 49.44% | 100.00% | $9.7M |
| 7305121060 | Linepipe Iron/Stl Longitudnly Weld, Gt 609.6mm Diam | $16K | 31.64% | 100.00% | $5K |
| 7305125000 | Linepipe Alloy Stl Longitud Weld, Gt 406.4mm Diam | — | -- | -- | -- |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 7305121000 | Ln Pp Ios Na Oth Lngtd Wld Diam O 406.4mm Circ Cs | $25K |
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.
Imports · August 2026
origin
South Korea and Mexico together supply 93% of it. Japan pays 50.0% duty; United Arab Emirates 0.0%.
customs district
destination
entry
rate provision · imports
duty collected equals 49.43% of imports for consumption.