Product classification
HS code for Steel gas tanks: 7311.00
Containers for compressed or liquefied gas, of iron or steel.
Classification of steel gas tanks under HS 7311.00
The classification of steel gas tanks under HS code 7311.00 covers containers specifically designed for the storage and transport of compressed or liquefied gas. Unlike standard storage tanks for liquids or solids, these containers are engineered to withstand high internal pressures. They are made of iron or steel and are subject to stringent manufacturing standards to ensure safety. This heading includes a wide variety of products, from small, portable cylinders used for medical oxygen or camping fuel to large industrial tanks used for nitrogen, argon, or liquefied petroleum gas (LPG). The containers can be seamless (often used for very high pressures) or welded. The classification applies regardless of the container's volume, which distinguishes it from the liquid containers in 7309 and 7310 that are classified based on capacity. It is also important to note that the container must be made of iron or steel; aluminum or composite cylinders are classified elsewhere. These articles are often referred to as "pressure vessels." Because gas containers are high-risk items, they are often subject to additional national regulations and safety certifications beyond the standard customs classification, though the HS code remains the primary identifier for international trade. The code covers both the cylinder body and any permanently attached valves or protective caps.
- Covers
- Steel oxygen cylinders
- LPG (Liquefied Petroleum Gas) tanks
- Compressed air bottles for industrial use
- High-pressure steel flasks for specialty gases
- Also under 7311.00
- Airgas oxygen tanks
- Worthington propane cylinders
- Luxfer scuba tanks
- SodaStream CO2 cylinders
- Praxair industrial gas tanks
Codes often confused with 7311.00
Common mistake. Non-pressurized steel containers for liquids are classified under 7310.10. Large stationary reservoirs for liquids with a capacity over 300L are under 7309.00. Aluminum gas cylinders are classified under 7613.00.
Top exporters and importers of HS 731100 (the code used for steel gas tanks), 2025
In 2025, the largest exporter of HS 731100 (the code used for steel gas tanks) in UN Comtrade data was China, with 29% of world exports; the largest importer in UN Comtrade data was the United States, with 12% 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 731100, not only steel gas tanks.
Top exporters 2025 · share of world exports
- 1 China $1.3B 29% of world exports
- 2 United States $326M 7.3% of world exports
- 3 Türkiye $283M 6.3% of world exports
World total: $4.5B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 United States $503M 12% of world imports
- 2 Germany $215M 5.2% of world imports
- 3 South Korea $213M 5.2% of world imports
World total: $4.1B 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 code for steel gas tanks
Brazil classifies steel gas tanks under NCM 7311.00.00: HS 7311.00 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 gas tanks
What is the HS code for Steel gas tanks?
The HS code for Steel gas tanks is 731100 (Containers for compressed or liquefied gas, of iron or steel). The HS code for iron or steel containers for compressed or liquefied gas is 7311.00.
How do I classify Steel gas tanks for customs?
Steel gas tanks is classified under HS code 731100 — Containers for compressed or liquefied gas, of iron or steel. This is a 6-digit subheading level code.
Does this code include the gas inside the tank?
Generally, the gas is classified separately under its own chemical HS code (Chapter 28 or 27), while the tank is classified under 7311.00.
Which countries are the top exporters of steel gas tanks (HS 731100)?
In 2025, the top exporters of HS 731100 (the code used for steel gas tanks) in UN Comtrade data were China ($1.3B, 29% of world exports), the United States ($326M) and Türkiye ($283M). World exports came to about $4.5B, 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.
Which countries are the top importers of steel gas tanks (HS 731100)?
In 2025, the top importers of HS 731100 (the code used for steel gas tanks) in UN Comtrade data were the United States ($503M, 12% of world imports), Germany ($215M) and South Korea ($213M). World imports came to about $4.1B, 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 Steel gas tanks the same in all countries?
The base HS code 731100 for Steel gas tanks 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 gas tanks in Brazil?
In Brazil, steel gas tanks (HS 731100) is classified under NCM 7311.00.00.