Product classification
HS code for Cast iron pipes: 7303.00
Cast iron, tubes, pipes and hollow profiles.
Classification of cast iron pipes under HS 7303.00
Cast iron pipes are classified under HS code 730300 because they are tubes, pipes, and hollow profiles made specifically from cast iron. This classification is determined by the material composition, where the iron contains a carbon content typically exceeding 2% by weight, distinguishing it from steel. The manufacturing process involves casting techniques, such as centrifugal casting, rather than rolling or welding. Under the Harmonized System, Chapter 73 covers articles of iron or steel, and 7303 is the specific heading for cast iron products of a tubular nature. This includes both grey cast iron and ductile (nodular) cast iron pipes. The classification remains the same regardless of whether the pipes are used for sewage, water distribution, or industrial fluid transport, provided they meet the metallurgical definition of cast iron and are not further worked into specific machinery parts.
- Covers
- Grey cast iron pipes for soil and waste drainage
- Ductile iron pipes for pressurized water mains
- Cast iron flanged pipes for industrial piping systems
- Hollow profiles made of cast iron for structural use
- Spigot and socket cast iron pipes
- 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 pipes are frequently confused with steel pipes classified under headings 7304 (seamless) or 7305 and 7306 (welded). The primary distinction is the carbon content and the manufacturing method; steel has lower carbon and is usually wrought. Additionally, pipe fittings made of cast iron are classified under 7307 rather than 7303. If the pipe is part of a specific machine, such as an engine block component, it might be classified under Section XVI (machinery) rather than Chapter 73.
Top exporters and importers of HS 730300 (the code used for cast iron pipes), 2025
In 2025, the largest exporter of HS 730300 (the code used for cast iron pipes) 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 pipes.
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 pipes
Brazil classifies cast iron pipes 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 pipes
What is the HS code for Cast iron pipes?
The HS code for Cast iron pipes is 730300 (Cast iron; tubes, pipes and hollow profiles). The primary HS code for cast iron pipes, tubes, and hollow profiles is 730300.
How do I classify Cast iron pipes for customs?
Cast iron pipes is classified under HS code 730300 — Cast iron; tubes, pipes and hollow profiles. This is a 6-digit subheading level code.
Does this code include ductile iron pipes?
Yes, ductile iron (also known as nodular iron) is considered a form of cast iron for customs purposes and is classified under 730300.
Which countries are the top exporters of cast iron pipes (HS 730300)?
In 2025, the top exporters of HS 730300 (the code used for cast iron pipes) 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 pipes (HS 730300)?
In 2025, the top importers of HS 730300 (the code used for cast iron pipes) 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 pipes the same in all countries?
The base HS code 730300 for Cast iron pipes 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 pipes in Brazil?
In Brazil, cast iron pipes (HS 730300) is classified under NCM 7303.00.00.