Product classification
HS code for Seamless steel tubing: 7304.29
Iron or steel (excluding cast iron or stainless steel), seamless, casing and tubing, of a kind used in drilling for oil or gas.
Classification of seamless steel tubing under HS 7304.29
Seamless steel tubing classified under HS code 7304.29 is categorized based on its specific end-use in the extraction of natural resources. This subheading covers casing and tubing of a kind used in drilling for oil or gas, provided they are made of iron or steel (excluding stainless steel and cast iron) and are manufactured using a seamless process. Classification follows GRI 1 and the specific nomenclature of heading 7304. These products are often referred to as Oil Country Tubular Goods (OCTG). The seamless nature is critical for withstanding the extreme subterranean pressures and corrosive environments found in oil and gas wells. Unlike general-purpose pipes, these tubes must meet rigorous standards, such as those set by the American Petroleum Institute (API), regarding tensile strength and collapse resistance. Subheading 7304.29 acts as a residual category for casing and tubing that does not meet the definitions of other specific subheadings within the 7304.2x group, such as those made of specific alloy steels or those with different finishing characteristics.
- Covers
- Seamless oil well casing
- Seamless production tubing for gas wells
- OCTG tubing (non-stainless)
- Seamless drill pipe (if not classified elsewhere)
- External upset tubing for oil extraction
- Also under 7304.29
- Tenaris seamless OCTG
- Vallourec seamless casing
- JFE seamless drill pipe
- TMK seamless production tubing
- Sumitomo seamless pipes
Codes often confused with 7304.29
Common mistake. A common error is classifying these products under 7304.11 or 7304.19, which are reserved for line pipe used for oil or gas pipelines. Line pipe is used for transporting fluids over distances, whereas 7304.29 is for the actual drilling and extraction process within the wellbore. Another misclassification occurs with 7304.39, which is for general-purpose non-alloy seamless tubes. If the tubing is intended for oil/gas drilling, the specific use-based code 7304.29 takes precedence over the general-purpose code. Furthermore, if the tubing is made of stainless steel, it must be classified under 7304.22 or 7304.24.
Top exporters and importers of HS 730429 (the code used for seamless steel tubing), 2025
In 2025, the largest exporter of HS 730429 (the code used for seamless steel tubing) in UN Comtrade data was China, with 37% of world exports; the largest importer in UN Comtrade data was Kuwait, with 16% 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 730429, not only seamless steel tubing.
Top exporters 2025 · share of world exports
- 1 China $1.9B 37% of world exports
- 2 Japan $691M 13% of world exports
- 3 Brazil $446M 8.7% of world exports
World total: $5.2B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Kuwait $974M 16% of world imports
- 2 United States $938M 15% of world imports
- 3 Canada $420M 6.7% of world imports
World total: $6.2B 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 steel tubing
Brazil splits HS 7304.29 into 4 NCM codes. Pick the one that matches your product:
- 7304.29.10Seamless non-alloy oil or gas casing and tubing
- 7304.29.31Uncoated alloy casing/tubing, OD up to 229 mm
- 7304.29.39Uncoated alloy casing/tubing, OD over 229 mm
- 7304.29.90Other seamless oil or gas casing and tubing
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 steel tubing
What is the HS code for Seamless steel tubing?
The HS code for Seamless steel tubing is 730429 (Iron or steel (excluding cast iron or stainless steel); seamless, casing and tubing, of a kind used in drilling for oil or gas).
How do I classify Seamless steel tubing for customs?
Seamless steel tubing is classified under HS code 730429 — Iron or steel (excluding cast iron or stainless steel); seamless, casing and tubing, of a kind used in drilling for oil or gas. This is a 6-digit subheading level code.
What is the HS code for oil well casing?
Seamless casing used in oil or gas drilling is classified under HS code 7304.29, provided it is not stainless steel.
Is line pipe classified under HS code 7304.29?
No, line pipe used for the transport of oil or gas is classified under heading 7304.11 or 7304.19, depending on the material.
Which countries are the top exporters of seamless steel tubing (HS 730429)?
In 2025, the top exporters of HS 730429 (the code used for seamless steel tubing) in UN Comtrade data were China ($1.9B, 37% of world exports), Japan ($691M) and Brazil ($446M). World exports came to about $5.2B, 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 seamless steel tubing (HS 730429)?
In 2025, the top importers of HS 730429 (the code used for seamless steel tubing) in UN Comtrade data were Kuwait ($974M, 16% of world imports), the United States ($938M) and Canada ($420M). World imports came to about $6.2B, 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.
Is the HS code for Seamless steel tubing the same in all countries?
The base HS code 730429 for Seamless steel tubing 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 steel tubing in Brazil?
Brazil splits HS 730429 into 4 NCM codes, so the right one for seamless steel tubing depends on the product's details: 7304.29.10 (Seamless non-alloy oil or gas casing and tubing), 7304.29.31 (Uncoated alloy casing/tubing, OD up to 229 mm), 7304.29.39 (Uncoated alloy casing/tubing, OD over 229 mm), 7304.29.90 (Other seamless oil or gas casing and tubing).