Product classification
HS code for Steel casing: 7306.29
Iron or steel (excluding cast iron), casing and tubing of a kind used in drilling for oil and gas (other than stainless steel or seamless), n.e.c. in chapter 73.
Classification of steel casing under HS 7306.29
Steel casing is classified under HS code 7306.29 because it falls within the category of other welded tubes and pipes made of iron or steel. Specifically, this subheading is reserved for casing and tubing of a kind used in drilling for oil or gas, which are not made of stainless steel and are not seamless. The classification is determined by two primary factors: the manufacturing process and the end-use application. Unlike seamless pipes, which are extruded, products under 7306.29 are typically produced by forming flat-rolled steel into a cylindrical shape and welding the longitudinal seam, often using Electric Resistance Welding (ERW). The 'n.e.c.' (not elsewhere classified) designation in this chapter ensures that welded casing that does not meet the specific criteria for larger diameters (over 406.4 mm) or specific alloy compositions found in other subheadings is captured here. This classification is vital for the energy sector, as it distinguishes standard welded casing from more specialized or larger-scale piping systems.
- Covers
- Welded steel oil well casing
- ERW (Electric Resistance Welded) casing pipes
- Gas extraction tubing (welded, non-stainless)
- Threaded and coupled steel casing
- Water well casing made of welded carbon steel
- Also under 7306.29
- EVRAZ welded OCTG
- Tenaris welded casing
- JFE welded line pipe
- TMK welded production tubing
- Welspun welded pipes
Codes often confused with 7306.29
Common mistake. Steel casing is frequently misclassified under HS code 7304.29. The critical distinction is that 7304.29 is strictly for seamless casing and tubing. Importers often confuse the two if they do not verify the manufacturing method. Another common error involves HS code 7305.20, which is reserved for welded casing with an external diameter exceeding 406.4 mm. If the pipe is welded but has a smaller diameter, it must stay in 7306.29. Additionally, if the casing is made of stainless steel, it should be classified under 7306.21.
Top exporters and importers of HS 730629 (the code used for steel casing), 2025
In 2025, the largest exporter of HS 730629 (the code used for steel casing) in UN Comtrade data was South Korea, with 30% of world exports; the largest importer in UN Comtrade data was the United States, with 76% 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 730629, not only steel casing.
Top exporters 2025 · share of world exports
- 1 South Korea $413M 30% of world exports
- 2 United States $232M 17% of world exports
- 3 Taiwan* ~$219M 16% of world exports · partner records ↗
World total: $1.4B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 United States $1.2B 76% of world imports
- 2 Canada $241M 16% of world imports
- 3 United Arab Emirates* ~$22M 1.4% of world imports · partner records ↗
World total: $1.5B 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 marked * did not, so their figures add up what other countries recorded trading with them, and their exports are valued at buyers' CIF prices. 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. UN Comtrade records Taiwan as "Other Asia, not elsewhere specified". Saudi Arabia's exports under that code are left out: they are far too large to be trade with Taiwan, so mostly undisclosed partners. 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 steel casing
Brazil classifies steel casing under NCM 7306.29.00: HS 7306.29 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 steel casing
What is the HS code for Steel casing?
The HS code for Steel casing is 730629 (Iron or steel (excluding cast iron); casing and tubing of a kind used in drilling for oil and gas (other than stainless steel or seamless), n.e.c. in chapter 73). The HS code for welded steel casing (other than stainless or seamless) used in oil and gas drilling is 7306.29.
How do I classify Steel casing for customs?
Steel casing is classified under HS code 730629 — Iron or steel (excluding cast iron); casing and tubing of a kind used in drilling for oil and gas (other than stainless steel or seamless), n.e.c. in chapter 73. This is a 6-digit subheading level code.
How do I distinguish between HS 7304 and 7306 for casing?
The distinction is based on the seam. HS 7304 is for seamless pipes, while HS 7306 is for pipes with a welded or riveted seam.
Which countries are the top exporters of steel casing (HS 730629)?
In 2025, the top exporters of HS 730629 (the code used for steel casing) in UN Comtrade data were South Korea ($413M, 30% of world exports), the United States ($232M) and Taiwan (about $219M). World exports came to about $1.4B, 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 steel casing (HS 730629)?
In 2025, the top importers of HS 730629 (the code used for steel casing) in UN Comtrade data were the United States ($1.2B, 76% of world imports), Canada ($241M) and the United Arab Emirates (about $22M). World imports came to about $1.5B, 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 Steel casing the same in all countries?
The base HS code 730629 for 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 steel casing in Brazil?
In Brazil, steel casing (HS 730629) is classified under NCM 7306.29.00.