HS code · 6-digit subheading
HS Code 7304.31 – Iron or non-alloy steel (excluding cast iron); seamless, cold-drawn or cold-rolled, tubes, pipes and hollow profiles of circular cross-section
HS code 7304.31 is the 6-digit subheading for iron or non-alloy steel (excluding cast iron), seamless, cold-drawn or cold-rolled, tubes, pipes and hollow profiles of circular cross-section. It is used for seamless cold-drawn precision tubes, hydraulic cylinder tubes, automotive exhaust pipes, boiler tubes and heat exchanger tubes.
What HS 7304.31 covers
This HS code covers seamless tubes, pipes, and hollow profiles of circular cross-section, made of iron or non-alloy steel (excluding cast iron), that have undergone cold-drawing or cold-rolling processes. Cold working significantly enhances the dimensional precision, surface finish, and mechanical properties such as strength and hardness of these products. They are extensively used in precision engineering, hydraulic systems, automotive components, and various general mechanical applications where high accuracy and performance are required. Importers are typically manufacturers of machinery, vehicles, and industrial equipment. Exporters are specialized steel tube mills. Trade is driven by the global demand for high-quality, precise industrial components across diverse manufacturing sectors.
- Covers
- Seamless cold-drawn precision tubes
- Hydraulic cylinder tubes
- Automotive exhaust pipes
- Boiler tubes
- Heat exchanger tubes
- Mechanical tubing
- Structural hollow sections
- Examples
- Sandvik seamless precision tubes
- Benteler automotive tubing
- ArcelorMittal cold-drawn pipes
- Sumitomo seamless mechanical tubes
- Salzgitter Mannesmann precision tubes
Codes often confused with 7304.31
Common mistake. Can be confused with 730410 (seamless line pipe for oil/gas) or 730439 (other seamless, not cold-drawn/rolled), as the 'cold-drawn/rolled' processing and 'circular cross-section' are specific defining characteristics.
Top exporters and importers of HS code 730431, 2025
In 2025, the largest exporter of HS code 730431 in UN Comtrade data was Germany, with 23% of world exports; the largest importer in UN Comtrade data was Germany, with 8.4% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Top exporters 2025 · share of world exports
- 1 Germany $349M 23% of world exports
- 2 China $308M 20% of world exports
- 3 Italy $136M 8.9% of world exports
World total: $1.5B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Germany $135M 8.4% of world imports
- 2 Italy $104M 6.5% of world imports
- 3 Saudi Arabia $86M 5.3% of world imports
World total: $1.6B 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 codes for 7304.31 2
Brazil splits HS 7304.31 into 2 NCM codes, Mercosur's 8-digit tariff lines.
- 7304.31.10 Uncoated cold-drawn/rolled seamless non-alloy tubeTubos não revestidos
- 7304.31.90 Other cold-drawn/rolled seamless non-alloy tubesOutros
All Brazil NCM codes in heading 73.04 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
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 HS 7304.31
What is HS code 730431?
HS code 730431 is a 6-digit subheading in the Harmonized System that covers: Iron or non-alloy steel (excluding cast iron); seamless, cold-drawn or cold-rolled, tubes, pipes and hollow profiles of circular cross-section. This HS code covers seamless tubes, pipes, and hollow profiles of circular cross-section, made of iron or non-alloy steel (excluding cast iron), that have undergone cold-drawing or cold-rolling processes. Cold working significantly enhances the dimensional precision, surface finish, and mechanical properties such as strength and hardness of these products. They are extensively used in precision engineering, hydraulic systems, automotive components, and various general mechanical applications where high accuracy and performance are required. Importers are typically manufacturers of machinery, vehicles, and industrial equipment. Exporters are specialized steel tube mills. Trade is driven by the global demand for high-quality, precise industrial components across diverse manufacturing sectors.
What products fall under HS code 730431?
Seamless cold-drawn precision tubes, hydraulic cylinder tubes, automotive exhaust pipes, boiler tubes, heat exchanger tubes, mechanical tubing, structural hollow sections
What are common misclassifications for HS code 730431?
Can be confused with 730410 (seamless line pipe for oil/gas) or 730439 (other seamless, not cold-drawn/rolled), as the 'cold-drawn/rolled' processing and 'circular cross-section' are specific defining characteristics.
Which countries are the top exporters of goods under HS code 730431?
In 2025, the top exporters of HS code 730431 in UN Comtrade data were Germany ($349M, 23% of world exports), China ($308M) and Italy ($136M). World exports came to about $1.5B, 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 goods under HS code 730431?
In 2025, the top importers of HS code 730431 in UN Comtrade data were Germany ($135M, 8.4% of world imports), Italy ($104M) and Saudi Arabia ($86M). World imports 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.
How is HS code 730431 structured?
HS code 730431 is a 6-digit subheading under the Harmonized System. The first 2 digits (73) identify the chapter, digits 3-4 (04) identify the heading, and digits 5-6 (31) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 730431?
Brazil splits HS code 730431 into 2 NCM codes: 7304.31.10 (Uncoated cold-drawn/rolled seamless non-alloy tube), 7304.31.90 (Other cold-drawn/rolled seamless non-alloy tubes). The first 6 digits of each match the HS code.