Product classification
HS code for Stainless steel flanges: 7307.21
Steel, stainless, tube or pipe fittings, flanges, of stainless steel.
Classification of stainless steel flanges under HS 7307.21
Stainless steel flanges are classified under HS code 7307.21. This code is situated within Chapter 73 (Articles of iron or steel) and heading 7307, which encompasses tube or pipe fittings (for example, couplings, elbows, sleeves), of iron or steel. Subheading 7307.21 is specifically designated for flanges made of 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 is determined by the material (stainless steel) and the function (a pipe fitting). Under the Harmonized System, 'stainless steel' is defined by its chromium content (at least 10.5%). These fittings are usually forged or machined and must meet various international standards (such as ANSI/ASME or DIN) to ensure compatibility in high-pressure or corrosive industrial environments like chemical plants or offshore platforms.
- Covers
- Stainless steel weld neck flanges
- Stainless steel slip-on flanges
- Stainless steel blind flanges
- Stainless steel threaded flanges
- Stainless steel socket weld flanges
- Lap joint flanges made of stainless steel
- Also under 7307.21
- Metalfar stainless steel flanges
- BFE Group stainless steel flanges
- Sandvik stainless steel flanges
- Outokumpu stainless steel components
Codes often confused with 7307.21
Common mistake. A common error is classifying these under 7307.11 or 7307.19, which are for cast fittings; most stainless steel flanges are forged and thus fall under 7307.21. Another mistake is using 7307.91, which is for flanges made of iron or non-stainless steel. Furthermore, if the flange is part of a valve assembly, it might be incorrectly classified under 8481. However, as a standalone fitting, 7307.21 is the correct code. Gaskets used with flanges are also often misclassified here, but they belong in 4016 (rubber) or 8484 (composite).
Top exporters and importers of HS 730721 (the code used for stainless steel flanges), 2025
In 2025, the largest exporter of HS 730721 (the code used for stainless steel flanges) in UN Comtrade data was China, with 27% of world exports; the largest importer in UN Comtrade data was the United States, with 11% 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 730721, not only stainless steel flanges.
Top exporters 2025 · share of world exports
- 1 China $457M 27% of world exports
- 2 India $252M 15% of world exports
- 3 Italy $180M 11% of world exports
World total: $1.7B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 United States $214M 11% of world imports
- 2 Germany $179M 9.5% of world imports
- 3 Netherlands $114M 6.0% of world imports
World total: $1.9B 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 stainless steel flanges
Brazil classifies stainless steel flanges under NCM 7307.21.00: HS 7307.21 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 stainless steel flanges
What is the HS code for Stainless steel flanges?
The HS code for Stainless steel flanges is 730721 (Steel, stainless; tube or pipe fittings, flanges, of stainless steel). The correct HS code for tube or pipe fittings that are flanges made of stainless steel is 7307.21.
How do I classify Stainless steel flanges for customs?
Stainless steel flanges is classified under HS code 730721 — Steel, stainless; tube or pipe fittings, flanges, of stainless steel. This is a 6-digit subheading level code.
Does this code include cast iron flanges?
No, cast iron flanges are classified under HS code 7307.11 (non-malleable) or 7307.19 (malleable).
Which countries are the top exporters of stainless steel flanges (HS 730721)?
In 2025, the top exporters of HS 730721 (the code used for stainless steel flanges) in UN Comtrade data were China ($457M, 27% of world exports), India ($252M) and Italy ($180M). World exports came to about $1.7B, 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 stainless steel flanges (HS 730721)?
In 2025, the top importers of HS 730721 (the code used for stainless steel flanges) in UN Comtrade data were the United States ($214M, 11% of world imports), Germany ($179M) and the Netherlands ($114M). World imports came to about $1.9B, 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 Stainless steel flanges the same in all countries?
The base HS code 730721 for Stainless 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 stainless steel flanges in Brazil?
In Brazil, stainless steel flanges (HS 730721) is classified under NCM 7307.21.00.