Product classification
HS code for Seamless steel casing: 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 casing under HS 7304.29
Seamless steel casing is classified under HS code 7304.29. This product falls under the category of Oil Country Tubular Goods (OCTG). The classification is specific to seamless tubes and pipes used in drilling for oil or gas. Casing is a large-diameter pipe that is assembled and inserted into a recently drilled section of a borehole and typically cemented into place to protect and support the wellstream. The HS system distinguishes these pipes from general-purpose pipes because of their specialized application and the rigorous standards (such as API 5CT) they must meet. Subheading 7304.29 covers "other" casing and tubing, meaning it excludes drill pipe (which has its own subheading) and is made of iron or steel (excluding stainless steel). The classification is determined by the pipe's function as a structural retainer for well walls during or after drilling operations.
- Covers
- Seamless OCTG casing pipes
- Seamless production tubing for oil wells
- API 5CT compliant seamless casing
- Intermediate and surface casing strings
- Seamless liners for oil and gas boreholes
- 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. Seamless casing is frequently misclassified as line pipe (7304.19). While both are used in the oil and gas industry, line pipe is intended for the transport of fluids over distances, whereas casing is used within the wellbore itself. Another common error is confusing seamless casing with welded casing (7306.29). If the pipe has any seam from welding, it must be moved to heading 7306. Additionally, drill pipe (7304.23) is often confused with casing; however, drill pipe is used to transmit torque and circulate drilling fluid, whereas casing is a static structural component.
Top exporters and importers of HS 730429 (the code used for seamless steel casing), 2025
In 2025, the largest exporter of HS 730429 (the code used for seamless steel casing) 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 casing.
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 casing
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 casing
What is the HS code for Seamless steel casing?
The HS code for Seamless steel casing 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). The HS code for seamless steel casing used in oil or gas drilling is 7304.29.
How do I classify Seamless steel casing for customs?
Seamless steel casing 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 difference between casing and tubing in HS classification?
In the context of HS code 7304.29, both casing and tubing are grouped together. Casing is used to line the borehole, while tubing is placed inside the casing to transport the oil or gas to the surface. Both are classified under 7304.29 if they are seamless and made of carbon or alloy steel.
Which countries are the top exporters of seamless steel casing (HS 730429)?
In 2025, the top exporters of HS 730429 (the code used for seamless steel casing) 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 casing (HS 730429)?
In 2025, the top importers of HS 730429 (the code used for seamless steel casing) 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 casing the same in all countries?
The base HS code 730429 for Seamless steel casing 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 casing in Brazil?
Brazil splits HS 730429 into 4 NCM codes, so the right one for seamless steel casing 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).