Product classification
HS code for Cast iron tubes: 7303.00
Cast iron, tubes, pipes and hollow profiles.
Classification of cast iron tubes under HS 7303.00
Cast iron tubes, pipes, and hollow profiles are classified under HS code 7303.00. This is a specific heading within Chapter 73 that covers all piping products made of cast iron, regardless of their intended use. Unlike steel pipes, which are classified in headings 7304 through 7306 based on whether they are seamless or welded, cast iron tubes are grouped together because the casting process itself defines the product's structural nature. Cast iron is preferred in many industrial and municipal applications, such as sewage and water mains, due to its high carbon content which offers superior corrosion resistance and dampening properties. The classification applies to the tubes themselves; once they are modified into specific shapes like elbows or tees, they may move to other headings, but the straight hollow profiles remain strictly under 7303.00.
- Covers
- Cast iron soil pipes
- Ductile iron water pipes
- Cast iron drain pipes
- Hollow profiles made of cast iron
- Centrifugally cast iron tubes
- Also under 7303.00
- Saint-Gobain PAM ductile iron pipes
- McWane cast iron soil pipes
- US Pipe ductile iron pipes
- Kubota cast iron pipes
- American Cast Iron Pipe Company products
Codes often confused with 7303.00
Common mistake. Cast iron tubes are often confused with tube or pipe fittings of cast iron, which fall under HS code 7307.11. Fittings include items like elbows, sleeves, and flanges. Another common misclassification is under 7304.11 or 7305.11, which are codes for steel pipes used for oil and gas pipelines. It is vital to distinguish between cast iron and steel, as steel pipes are subject to different technical standards and trade tariffs.
Top exporters and importers of HS 730300 (the code used for cast iron tubes), 2025
In 2025, the largest exporter of HS 730300 (the code used for cast iron tubes) in UN Comtrade data was China, with 25% of world exports; the largest importer in UN Comtrade data was Italy, with 6.5% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Figures cover everything classified under HS 730300, not only cast iron tubes.
Top exporters 2025 · share of world exports
- 1 China $394M 25% of world exports
- 2 France $273M 17% of world exports
- 3 India $187M 12% of world exports
World total: $1.6B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Italy $116M 6.5% of world imports
- 2 Kuwait $99M 5.5% of world imports
- 3 France $91M 5.1% of world imports
World total: $1.8B Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM code for cast iron tubes
Brazil classifies cast iron tubes under NCM 7303.00.00: HS 7303.00 with 00 added.
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
EU Regulatory Requirements
This product falls under the Carbon Border Adjustment Mechanism (CBAM). Importers to the EU must declare embedded carbon emissions and purchase CBAM certificates.
Questions about cast iron tubes
What is the HS code for Cast iron tubes?
The HS code for Cast iron tubes is 730300 (Cast iron; tubes, pipes and hollow profiles). The HS code for tubes, pipes, and hollow profiles made of cast iron is 7303.00.
How do I classify Cast iron tubes for customs?
Cast iron tubes is classified under HS code 730300 — Cast iron; tubes, pipes and hollow profiles. This is a 6-digit subheading level code.
Does this include ductile iron pipes?
Yes, ductile iron is a type of cast iron (spheroidal graphite iron), and pipes made from it are classified under HS code 7303.00.
Which countries are the top exporters of cast iron tubes (HS 730300)?
In 2025, the top exporters of HS 730300 (the code used for cast iron tubes) in UN Comtrade data were China ($394M, 25% of world exports), France ($273M) and India ($187M). World exports came to about $1.6B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of cast iron tubes (HS 730300)?
In 2025, the top importers of HS 730300 (the code used for cast iron tubes) in UN Comtrade data were Italy ($116M, 6.5% of world imports), Kuwait ($99M) and France ($91M). World imports came to about $1.8B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Is the HS code for Cast iron tubes the same in all countries?
The base HS code 730300 for Cast iron tubes is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.
What is the NCM code for cast iron tubes in Brazil?
In Brazil, cast iron tubes (HS 730300) is classified under NCM 7303.00.00.