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HSChapter 73
U.S. exports of tubes, pipes & hollow profiles of cast iron (HS 730300) totaled $4.9M in July 2026.
Importers of Tubes, Pipes & Hollow Profiles of Cast Iron paid $333K in duties in July 2026 — an effective duty rate of 11% on $3.1M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 2026 dataCast iron's graphite microstructure gives these pipes and hollow profiles superior corrosion resistance and vibration damping compared to steel alternatives, making them a longstanding choice for municipal water, sewer, and drainage infrastructure. The US tariff schedule subdivides the heading into soil pipe (7303000030), pressure pipe with inside diameter less than 356 mm (7303000060), and all other cast iron tubes and profiles (7303000090). Section 232 tariffs apply to cast iron pipe as a steel-adjacent iron product, and importers should verify whether ductile iron or gray iron grades affect both classification and compliance with AWWA or ASTM standards required by municipal procurement contracts.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
124 shipments/mo
Yes. Ductile iron (also called nodular or spheroidal graphite iron) is a form of cast iron and classifies under heading 7303 along with gray cast iron pipe. The distinction between ductile and gray iron matters for engineering specifications and AWWA standards but does not create a separate HTS heading.
The pressure pipe provision at 7303000060 covers cast iron pressure pipe with an inside diameter less than 356 mm. Pipe with an inside diameter of 356 mm or greater, as well as non-pressure applications not covered by the soil pipe line, would fall under the NESOI provision at 7303000090. Confirming the inside diameter measurement and the pipe's intended service (pressure vs. gravity/drainage) is essential for correct classification.
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Subheading 1 of 1 in heading 7303
Subheading 730300 · $3.1M of $3.1M
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 7303000090 | Tubes, Pipes and Hollow Profiles, Cast Iron, NESOI | $3.1M | 10.67% | 98.01% | $327K |
| 7303000060 | Pressure Pipe, Cast Iron, Insde Diam Ls Thn 356 Mm | $59K | 6.18% | 100.00% | $4K |
| 7303000030 | Soil Pipe of Cast Iron | $27K | 10.47% | 100.00% | $3K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 7303000090 | Tubes, Pipes and Hollow Profiles, Cast Iron, NESOI | $3.0M |
| 7303000060 | Pressure Pipe, Cast Iron, Insde Diam Ls Thn 356 Mm | $1.4M |
| 7303000030 | Soil Pipe of Cast Iron | $469K |
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
$3.1MYoY · Pro
Exports
$4.9MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Exports · July 2026
destination
Canada and Mexico together take 97% of it.
customs district
origin
entry
rate provision · imports
1.9% enters free of duty; the effective duty rate is 10.59%.