Product classification
HS code for Steel flanges: 7307.91
Iron or steel, tube or pipe fittings, flanges, other than stainless steel.
Classification of steel flanges under HS 7307.91
Steel flanges are categorized under HS code 7307.91. This code is situated within Heading 7307, which encompasses tube or pipe fittings of iron or steel. The classification distinguishes between different types of fittings (such as couplings, elbows, and sleeves) and different material compositions. Subheading 7307.91 is specifically reserved for flanges made of iron or non-alloy steel, excluding stainless steel. Flanges are essential components used to connect pipes, valves, pumps, and other equipment to form a piping system. They provide easy access for cleaning, inspection, or modification. The classification depends heavily on the metallurgical properties of the steel. If the flange contains more than 10.5% chromium, it would likely be reclassified as stainless steel under 7307.21. Furthermore, the classification assumes the product is a finished or semi-finished fitting ready for installation in a piping network. The distinction between cast and non-cast fittings is also vital, as cast iron fittings fall under 7307.11 or 7307.19. For 7307.91, the product is typically forged or machined from carbon steel.
- Covers
- Slip-on flanges for piping systems
- Weld neck flanges
- Blind flanges for sealing pipe ends
- Threaded flanges of non-alloy steel
- Socket weld flanges
- Also under 7307.91
- Forged Components Inc. carbon steel flanges
- Galperti carbon steel flanges
- Ulma Piping carbon steel flanges
- Tenaris carbon steel flanges
Codes often confused with 7307.91
Common mistake. The most frequent misclassification occurs between 7307.91 (non-alloy steel flanges) and 7307.21 (stainless steel flanges). Customs authorities strictly enforce the material composition; any flange meeting the definition of stainless steel must be moved to the 7307.2x series. Another common error is confusing flanges with other pipe fittings like elbows or tees, which are classified under 7307.92 or 7307.99. Finally, cast iron flanges are often incorrectly placed here instead of under 7307.19, which covers cast articles of iron or steel.
Top exporters and importers of HS 730791 (the code used for steel flanges), 2025
In 2025, the largest exporter of HS 730791 (the code used for steel flanges) in UN Comtrade data was China, with 32% of world exports; the largest importer in UN Comtrade data was the United States, with 15% 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 730791, not only steel flanges.
Top exporters 2025 · share of world exports
- 1 China $703M 32% of world exports
- 2 Italy $357M 16% of world exports
- 3 India $267M 12% of world exports
World total: $2.2B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 United States $366M 15% of world imports
- 2 Saudi Arabia $163M 6.8% of world imports
- 3 Germany $134M 5.6% of world imports
World total: $2.4B 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 steel flanges
Brazil classifies steel flanges under NCM 7307.91.00: HS 7307.91 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 steel flanges
What is the HS code for Steel flanges?
The HS code for Steel flanges is 730791 (Iron or steel; tube or pipe fittings, flanges, other than stainless steel). The HS code for flanges of iron or non-alloy steel (other than stainless) is 7307.91.
How do I classify Steel flanges for customs?
Steel flanges is classified under HS code 730791 — Iron or steel; tube or pipe fittings, flanges, other than stainless steel. This is a 6-digit subheading level code.
Are stainless steel flanges included in 7307.91?
No, stainless steel flanges are classified under HS code 7307.21.
Which countries are the top exporters of steel flanges (HS 730791)?
In 2025, the top exporters of HS 730791 (the code used for steel flanges) in UN Comtrade data were China ($703M, 32% of world exports), Italy ($357M) and India ($267M). World exports came to about $2.2B, 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 steel flanges (HS 730791)?
In 2025, the top importers of HS 730791 (the code used for steel flanges) in UN Comtrade data were the United States ($366M, 15% of world imports), Saudi Arabia ($163M) and Germany ($134M). World imports came to about $2.4B, 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 Steel flanges the same in all countries?
The base HS code 730791 for Steel flanges 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 steel flanges in Brazil?
In Brazil, steel flanges (HS 730791) is classified under NCM 7307.91.00.