HS code · 6-digit subheading
HS Code 7305.31 – Iron or steel (excluding cast iron); tubes and pipes (other than line pipe or casing of a kind used for oil or gas pipelines), longitudinally welded, having circular cross-sections, external diameter exceeds 406.4mm, (not seamless)
HS code 7305.31 is the 6-digit subheading for iron or steel (excluding cast iron), tubes and pipes (other than line pipe or casing of a kind used for oil or gas pipelines), longitudinally welded, having circular cross-sections, external diameter exceeds 406.4mm, (not seamless). It is used for large-diameter water transmission pipes, industrial process piping, structural support columns, ventilation shafts and slurry transport pipes.
What HS 7305.31 covers
This code encompasses large-diameter, longitudinally welded iron or steel tubes and pipes, specifically those with an external diameter exceeding 406.4mm, excluding seamless varieties and those designed for oil or gas pipelines. These robust pipes are crucial for heavy industrial applications, infrastructure projects, and general construction where high volume fluid or material transport is required. Key importers and exporters are typically industrialized nations with significant manufacturing capabilities and ongoing infrastructure development, such as China, Germany, Japan, and the United States. The trade in these goods is often driven by large-scale public works, energy sector investments (excluding direct oil/gas pipelines), and industrial expansion. Buyers include construction companies, engineering firms, and municipal utilities. Understanding the specific welding method (longitudinal) and diameter is critical for correct classification, as these pipes are distinct from those used in the oil and gas sector, which fall under different headings. The material's strength and durability are paramount for their intended heavy-duty uses.
- Covers
- Large-diameter water transmission pipes
- Industrial process piping
- Structural support columns
- Ventilation shafts
- Slurry transport pipes
- Municipal drainage pipes
- Power plant cooling water pipes
- Examples
- ArcelorMittal large-diameter welded pipes
- EVRAZ large-diameter structural pipes
- JFE Steel welded steel pipes
- Tenaris industrial pipes
- Baosteel heavy-duty pipes
Codes often confused with 7305.31
Common mistake. This code is often confused with 730511 (longitudinally welded line pipe for oil/gas) due to similar dimensions and welding, but the key distinction is the intended use for oil/gas pipelines. It can also be confused with 730630 for smaller diameter welded pipes.
Top exporters and importers of HS code 730531, 2025
In 2025, the largest exporter of HS code 730531 in UN Comtrade data was Germany, with 40% of world exports; the largest importer in UN Comtrade data was the United States, with 14% 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 $584M 40% of world exports
- 2 China $290M 20% of world exports
- 3 South Korea $224M 15% of world exports
World total: $1.5B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 United States $149M 14% of world imports
- 2 United Arab Emirates* ~$98M 9.4% of world imports · partner records ↗
- 3 China $83M 7.9% of world imports
World total: $1.0B 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 marked * did not, so their figures add up what other countries recorded trading with them, and their exports are valued at buyers' CIF prices. 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 7305.31
Brazil does not split HS 7305.31: its NCM code is 7305.31.00.
All Brazil NCM codes in heading 73.05 →
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 7305.31
What is HS code 730531?
HS code 730531 is a 6-digit subheading in the Harmonized System that covers: Iron or steel (excluding cast iron); tubes and pipes (other than line pipe or casing of a kind used for oil or gas pipelines), longitudinally welded, having circular cross-sections, external diameter exceeds 406.4mm, (not seamless). This code encompasses large-diameter, longitudinally welded iron or steel tubes and pipes, specifically those with an external diameter exceeding 406.4mm, excluding seamless varieties and those designed for oil or gas pipelines. These robust pipes are crucial for heavy industrial applications, infrastructure projects, and general construction where high volume fluid or material transport is required. Key importers and exporters are typically industrialized nations with significant manufacturing capabilities and ongoing infrastructure development, such as China, Germany, Japan, and the United States. The trade in these goods is often driven by large-scale public works, energy sector investments (excluding direct oil/gas pipelines), and industrial expansion. Buyers include construction companies, engineering firms, and municipal utilities. Understanding the specific welding method (longitudinal) and diameter is critical for correct classification, as these pipes are distinct from those used in the oil and gas sector, which fall under different headings. The material's strength and durability are paramount for their intended heavy-duty uses.
What products fall under HS code 730531?
Large-diameter water transmission pipes, industrial process piping, structural support columns, ventilation shafts, slurry transport pipes, municipal drainage pipes, power plant cooling water pipes
What are common misclassifications for HS code 730531?
This code is often confused with 730511 (longitudinally welded line pipe for oil/gas) due to similar dimensions and welding, but the key distinction is the intended use for oil/gas pipelines. It can also be confused with 730630 for smaller diameter welded pipes.
Which countries are the top exporters of goods under HS code 730531?
In 2025, the top exporters of HS code 730531 in UN Comtrade data were Germany ($584M, 40% of world exports), China ($290M) and South Korea ($224M). 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 730531?
In 2025, the top importers of HS code 730531 in UN Comtrade data were the United States ($149M, 14% of world imports), the United Arab Emirates (about $98M) and China ($83M). World imports came to about $1.0B, 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 730531 structured?
HS code 730531 is a 6-digit subheading under the Harmonized System. The first 2 digits (73) identify the chapter, digits 3-4 (05) 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 730531?
In Brazil, HS code 730531 is NCM 7305.31.00. The last two digits are 00 because Brazil does not split this HS code further.