Product classification
HS code for Stainless pipe flanges: 7307.21
Steel, stainless, tube or pipe fittings, flanges, of stainless steel.
Classification of stainless pipe flanges under HS 7307.21
Stainless steel pipe flanges are classified under HS code 7307.21. Chapter 73 of the Harmonized System covers articles of iron or steel. Heading 7307 is specifically designated for tube or pipe fittings, such as couplings, elbows, sleeves, and flanges. The classification is further refined by the material and the specific type of fitting. Subheading 7307.21 is reserved for flanges made specifically of stainless steel. These components are used to connect pipes, valves, pumps, and other equipment to form a piping system. The classification is determined by the metallurgical composition (stainless steel) and the function of the article (a flange). To qualify as stainless steel under the HS code, the alloy must contain by weight 1.2% or less of carbon and 10.5% or more of chromium. Flanges are typically flat rings or disks that are bolted together to join pipe sections. This code covers various types of stainless flanges, including slip-on, weld neck, and blind flanges, provided they meet the material specifications. This classification is governed by GRI 1 and the specific definitions found in the Chapter 72 and 73 notes.
- Covers
- Stainless steel slip-on flanges
- Stainless steel weld neck flanges
- Stainless steel blind flanges
- Stainless steel socket weld flanges
- Stainless steel threaded flanges
- Stainless steel lap joint flanges
- Forged stainless steel flanges
- 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 frequent misclassification is using 7307.11 or 7307.19, which are for cast fittings. While some flanges are cast, most industrial stainless flanges are forged and fall under 7307.21. Another error is using 7307.91, which is for flanges made of iron or non-stainless steel. It is critical to verify the chromium content to distinguish between stainless steel and other alloy steels, as this significantly impacts the duty rate and trade compliance.
Top exporters and importers of HS 730721 (the code used for stainless pipe flanges), 2025
In 2025, the largest exporter of HS 730721 (the code used for stainless pipe 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 pipe 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 pipe flanges
Brazil classifies stainless pipe 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 pipe flanges
What is the HS code for Stainless pipe flanges?
The HS code for Stainless pipe flanges is 730721 (Steel, stainless; tube or pipe fittings, flanges, of stainless steel). The HS code for stainless steel pipe flanges is 7307.21. This code is specific to flanges and does not include other types of fittings like elbows or couplings.
How do I classify Stainless pipe flanges for customs?
Stainless pipe 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.
Are gaskets included in this HS code?
No, gaskets are classified separately based on their material. For example, rubber gaskets fall under 4016.93, while composite gaskets may fall under 8484.10. They are only classified with the flange if they are part of a specialized kit.
Which countries are the top exporters of stainless pipe flanges (HS 730721)?
In 2025, the top exporters of HS 730721 (the code used for stainless pipe 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 pipe flanges (HS 730721)?
In 2025, the top importers of HS 730721 (the code used for stainless pipe 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 pipe flanges the same in all countries?
The base HS code 730721 for Stainless pipe 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 pipe flanges in Brazil?
In Brazil, stainless pipe flanges (HS 730721) is classified under NCM 7307.21.00.