U.S. imports of Large-Diameter Longitudinally Welded Pipes & Tubes, Iron or Steel (Over 16 In.) (HS 730531) totaled $6.8M in August 2026, imported from 13 countries.
Importers of Large-Diameter Longitudinally Welded Pipes & Tubes, Iron or Steel (Over 16 In.) paid $2.8M in duties in August 2026, an average duty rate of 42.01% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Large-Diameter Longitudinally Welded Pipes & Tubes, Iron or Steel (Over 16 In.) imports of $6.8M in August 2026 ran 26% above the year-to-date monthly average of $5.4M.
Last updated: August 2026 dataLongitudinally welded pipes and tubes with an external diameter exceeding 406.4 mm serve critical infrastructure roles in water transmission, structural piling, and industrial process piping. Section 232 tariffs apply broadly to this steel product category, and importers must carefully distinguish longitudinal welding from other welding methods to ensure correct classification under this heading versus 730539. Germany and India are the leading suppliers to the US market, with South Korea, Mexico, and Taiwan also among the top sources. The heading's alloy-steel lines (7305316010 for stainless and 7305316090 for other alloy) carry distinct classification considerations from the non-alloy line 7305314000.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
159 import shipments a month
The key distinction is the welding method: 730531 covers pipes and tubes welded longitudinally (seam running parallel to the pipe axis), while 730539 captures all other welded configurations — such as spiral or helical welding. Misclassifying the weld type is a common error; consulting a licensed customs broker is advisable when the manufacturing method is not clearly documented.
Yes. Tariff line 7305312000 is specifically designated for tapered steel pipes and tubes that are longitudinally welded and intended for use as light poles. This end-use specificity means that tapered pipes destined for other applications would generally fall under a different line within the heading, making documentation of intended use important at entry.
Subheading 3 of 7 in heading 7305
Subheading 730531 · $6.8M of $70.2M
ImportsExports
Imports
$6.8MYoY · free account
Exports
$6.3MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $84.5M of Large-Diameter Longitudinally Welded Pipes & Tubes, Iron or Steel (Over 16 In.) and exported $37.9M.
Through August 2026. Source: U.S. Census Bureau.
Trade Directory
List your company under HS 730531 — Large-Diameter Longitudinally Welded Pipes & Tubes, Iron or Steel (Over 16 In.), 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 |
|---|---|---|---|---|---|
| 7305314000 | Tubes, Pipes NESOI, Longitudnly Welded Irn/Nal Stl | $3.0M | 32.30% | 100.00% | $958K |
| 7305316010 | Tubes/Pipes Ss LNG Weld Cir X-Sec Gt 406.4mm NESOI | $2.8M | 49.34% | 100.00% | $1.4M |
| 7305316090 | Tubes/Pipe Alloy LNG Wld Cir Xsec Gt 406.4mm NESOI | $1.0M | 50.00% | 100.00% | $506K |
| 7305312000 | Tapered Stl Pipes, Tubes Long Wld for Light Poles | $10K | 75.00% | 100.00% | $8K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
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 Germany together supply 75% of it. South Korea pays 50.0% duty; India 0.0%.
customs district
destination
entry
rate provision · imports
duty collected equals 42.01% of imports for consumption.