Product classification
HS code for Oilfield casing: 7305.20
Iron or steel (excluding cast iron), casing of a kind used in drilling for oil or gas (not seamless), having circular cross-sections, external diameter exceeds 406.4mm.
Classification of oilfield casing under HS 7305.20
Oilfield casing classified under HS code 730520 refers to iron or steel pipes that are not seamless—meaning they are typically welded—and possess an external diameter exceeding 406.4 mm (16 inches). These pipes are used to line the borehole of oil and gas wells to provide structural integrity and prevent the collapse of the wellbore. The classification is determined by three primary factors: the material (iron or steel), the manufacturing process (welded/non-seamless), and the specific dimensions (diameter > 406.4 mm). This code is part of Chapter 73, which covers articles of iron or steel, and specifically addresses large-diameter pipes used in the energy sector. The welding process used for these pipes, such as longitudinal or spiral welding, is a key identifier. Because these pipes are subjected to significant geological pressure, they must meet specific API (American Petroleum Institute) standards, yet for HS classification, the physical dimensions and the fact that they are not seamless are the most important criteria. This classification is distinct from smaller diameter pipes or those manufactured without a seam. The large diameter usually indicates use in the upper sections of a well where the casing must support the weight of subsequent strings and protect groundwater zones.
- Covers
- Longitudinal submerged arc welded (LSAW) casing
- Spiral welded casing for oil and gas wells
- Welded iron casing with diameter > 406.4mm
- Welded steel casing for deep well drilling
- Large diameter conductor pipe
- Also under 7305.20
- Tenaris API 5CT casing
- Vallourec large diameter casing
- JFE Steel casing
- TMK large diameter casing
Codes often confused with 7305.20
Common mistake. This code is often confused with HS code 730429, which covers seamless casing. The primary difference is the manufacturing method. It is also confused with 730629, which covers welded casing with an external diameter of 406.4 mm or less. Accurate measurement of the outer diameter is essential for correct classification.
Top exporters and importers of HS 730520 (the code used for oilfield casing), 2025
In 2025, the largest exporter of HS 730520 (the code used for oilfield casing) in UN Comtrade data was Brazil, with 29% of world exports; the largest importer in UN Comtrade data was Guyana, with about 20% 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 730520, not only oilfield casing.
Top exporters 2025 · share of world exports
- 1 Brazil $138M 29% of world exports
- 2 Indonesia $113M 24% of world exports
- 3 Singapore $84M 18% of world exports
World total: $479M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Guyana* ~$86M 20% of world imports · partner records ↗
- 2 Singapore $67M 16% of world imports
- 3 Kuwait $53M 12% of world imports
World total: $427M 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. 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 oilfield casing
Brazil classifies oilfield casing under NCM 7305.20.00: HS 7305.20 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 oilfield casing
What is the HS code for Oilfield casing?
The HS code for Oilfield casing is 730520 (Iron or steel (excluding cast iron); casing of a kind used in drilling for oil or gas (not seamless), having circular cross-sections, external diameter exceeds 406.4mm). The HS code for welded oilfield casing with an external diameter exceeding 406.4 mm is 730520.
How do I classify Oilfield casing for customs?
Oilfield casing is classified under HS code 730520 — Iron or steel (excluding cast iron); casing of a kind used in drilling for oil or gas (not seamless), having circular cross-sections, external diameter exceeds 406.4mm. This is a 6-digit subheading level code.
Is seamless casing included in this code?
No, seamless casing is classified under heading 7304, specifically 730429 for most oilfield applications.
Which countries are the top exporters of oilfield casing (HS 730520)?
In 2025, the top exporters of HS 730520 (the code used for oilfield casing) in UN Comtrade data were Brazil ($138M, 29% of world exports), Indonesia ($113M) and Singapore ($84M). World exports came to about $479M, 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 oilfield casing (HS 730520)?
In 2025, the top importers of HS 730520 (the code used for oilfield casing) in UN Comtrade data were Guyana (about $86M, 20% of world imports), Singapore ($67M) and Kuwait ($53M). World imports came to about $427M, 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 Oilfield casing the same in all countries?
The base HS code 730520 for Oilfield 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 oilfield casing in Brazil?
In Brazil, oilfield casing (HS 730520) is classified under NCM 7305.20.00.