Product classification
HS code for Seamless alloy steel pipes: 7304.59
Steel, alloy (not stainless steel), (excluding cold-drawn or cold-rolled), tubes, pipes and hollow profiles of circular cross-section.
Classification of seamless alloy steel pipes under HS 7304.59
Seamless alloy steel pipes are classified under HS code 7304.59 because they are tubes, pipes, and hollow profiles made of alloy steel (other than stainless steel) that have been manufactured without a welded seam. The classification within heading 7304 is determined by the manufacturing process (seamless) and the material composition (alloy steel). Specifically, subheading 7304.59 covers products that are not cold-drawn or cold-rolled (cold-reduced). According to the Harmonized System's General Rules of Interpretation (GRI), products must be classified based on their constituent material and their state of finish. Alloy steel, as defined in Chapter 72, Note 1(f), contains elements such as manganese, silicon, nickel, or chromium in specific weight percentages that exceed the limits for non-alloy steel. These pipes are typically produced through hot-rolling, hot-extrusion, or hot-drawing, which results in a robust product capable of withstanding high pressure and temperature, making them distinct from standard carbon steel pipes.
- Covers
- Hot-rolled seamless alloy steel tubes
- High-pressure boiler tubes made of alloy steel
- Mechanical tubing for structural applications
- Alloy steel hollow profiles of circular cross-section
- Heat exchanger tubes (non-stainless alloy)
- Also under 7304.59
- Tenaris seamless alloy pipes
- Vallourec hot-finished alloy tubes
- ArcelorMittal alloy structural sections
- JFE Steel alloy industrial pipes
Codes often confused with 7304.59
Common mistake. A frequent error involves confusing 7304.59 with 7304.39, which is reserved for non-alloy (carbon) steel pipes. The distinction lies in the chemical composition; if the alloying elements meet the thresholds defined in the Chapter 72 notes, 7304.59 must be used. Another common misclassification occurs with 7304.51, which is specifically for alloy steel pipes that have undergone a cold-drawing or cold-rolling process. Cold-finished pipes have tighter tolerances and a smoother surface finish, necessitating a different code. Additionally, stainless steel pipes are often incorrectly placed here, but they belong under 7304.41 or 7304.49 depending on their finish.
Top exporters and importers of HS 730459 (the code used for seamless alloy steel pipes), 2025
In 2025, the largest exporter of HS 730459 (the code used for seamless alloy steel pipes) in UN Comtrade data was China, with 30% of world exports; the largest importer in UN Comtrade data was India, with 19% 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 730459, not only seamless alloy steel pipes.
Top exporters 2025 · share of world exports
- 1 China $473M 30% of world exports
- 2 Germany $161M 10% of world exports
- 3 Italy $160M 10% of world exports
World total: $1.6B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 India $394M 19% of world imports
- 2 United States $213M 10% of world imports
- 3 Saudi Arabia $153M 7.4% of world imports
World total: $2.1B 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 seamless alloy steel pipes
Brazil splits HS 7304.59 into 2 NCM codes. Pick the one that matches your product:
- 7304.59.10Hot-finished alloy steel tubes, OD to 229 mm
- 7304.59.90Other hot-finished seamless alloy steel tubes
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 seamless alloy steel pipes
What is the HS code for Seamless alloy steel pipes?
The HS code for Seamless alloy steel pipes is 730459 (Steel, alloy (not stainless steel); (excluding cold-drawn or cold-rolled), tubes, pipes and hollow profiles of circular cross-section). The primary HS code for hot-finished seamless alloy steel pipes (excluding stainless) is 7304.59.
How do I classify Seamless alloy steel pipes for customs?
Seamless alloy steel pipes is classified under HS code 730459 — Steel, alloy (not stainless steel); (excluding cold-drawn or cold-rolled), tubes, pipes and hollow profiles of circular cross-section. This is a 6-digit subheading level code.
How do I distinguish between alloy steel and stainless steel for classification?
Stainless steel must contain at least 10.5% chromium by weight and a maximum of 1.2% carbon. If the steel contains other alloying elements but does not meet the specific chromium threshold for stainless steel, it is classified as "other alloy steel" under subheadings like 7304.59.
Which countries are the top exporters of seamless alloy steel pipes (HS 730459)?
In 2025, the top exporters of HS 730459 (the code used for seamless alloy steel pipes) in UN Comtrade data were China ($473M, 30% of world exports), Germany ($161M) and Italy ($160M). World exports 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.
Which countries are the top importers of seamless alloy steel pipes (HS 730459)?
In 2025, the top importers of HS 730459 (the code used for seamless alloy steel pipes) in UN Comtrade data were India ($394M, 19% of world imports), the United States ($213M) and Saudi Arabia ($153M). World imports came to about $2.1B, 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 Seamless alloy steel pipes the same in all countries?
The base HS code 730459 for Seamless alloy steel pipes 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 seamless alloy steel pipes in Brazil?
Brazil splits HS 730459 into 2 NCM codes, so the right one for seamless alloy steel pipes depends on the product's details: 7304.59.10 (Hot-finished alloy steel tubes, OD to 229 mm), 7304.59.90 (Other hot-finished seamless alloy steel tubes).