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

Q: Is HS code 730520 the same in every country?

Yes — HS code 730520 is part of the WCO Harmonized System and is the same in every WCO member country at the 6-digit level. Beyond 6 digits, each country extends the code under its own system (e.g. HTSUS in the US, CN/TARIC in the EU, HSK in Korea, CCCHS in China) for national tariff rates and trade statistics. To see how a specific country classifies this code, select a country.

Q: Which WCO edition does HS code 730520 belong to, and has it been reclassified?

The Harmonized System is maintained by the World Customs Organization (WCO) and revised approximately every five years. The current edition is HS 2022, which replaced HS 2017 on 1 January 2022. Codes are added, merged, or split between editions to reflect new products and trade patterns, so a code valid in one edition may not exist or may mean something different in another.

Q: How do I find the correct country-specific version of HS code 730520?

Beyond the international 6-digit level, each country adds its own digits — the US extends to 10 digits (HTSUS), the EU to 8 or 10 (CN/TARIC), China to 13 (CCCHS), Korea to 10 (HSK), Japan to 9, and so on. To find the full code used by a specific country, select a country in TradeInt's HS Code Tool and search for 730520.

What is HS Code 730520

HS Code 730520 covers 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. It is a 6-digit subheading — the deepest level of the international HS — within: · Section XV — Base metals and articles of base metal · Chapter 73 — Articles of iron or steel · Heading 7305 — Iron or steel (excluding cast iron); tubes and pipes (e.g. welded, riveted or similarly closed), having circular cross-sections, external diameter of which exceeds 406.4mm, not seamless. At 6 digits, this code is the same in every HS-adopting country. From digit 7 onward, each country extends it.

Explore global 2026 latest import export trade data and shipment records for Large Welded Oil Casing on TradeInt global trade data platform

What does 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 Cover?

Section XV

Chapters (72-83) Base metals and articles of base metal

Chapter 73

Articles of iron or steel

HS Code 7305

Iron or steel (excluding cast iron); tubes and pipes (e.g. welded, riveted or similarly closed), having circular cross-sections, external diameter of which exceeds 406.4mm, not seamless

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

Click any HS code above to see live 2026 latest Large Welded Oil Casing trade data including exporters, importers, and shipment volumes.

What HS Codes for Iron and Steel Articles Do Not Cover

Chapter 73 covers articles of iron or steel — tubes, fittings, structures, hardware. Goods frequently misclassified here but that belong elsewhere include:

Machinery and mechanical appliances

Chapter 84

Tools and cutlery

Chapter 82

Vehicle parts

Chapter 87

Furniture of steel

Chapter 94

This list highlights common classification errors only — it is not exhaustive. For binding classification, work with a licensed customs broker or qualified trade compliance professional.

Top Trading Countries for Large Welded Oil Casing HS 730520

India

Key Importer & Exporter

United States of America

Key Importer & Exporter

Mexico

Key Importer & Exporter

Frequently Asked Questions

What is HS code 730520?

HS code 730520 covers 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 under the WCO Harmonized System. It belongs to Chapter 73 (Articles of iron or steel), Heading 7305, and represents the most specific level of classification that is harmonized internationally.

Is HS code 730520 the same in every country?

Which WCO edition does HS code 730520 belong to, and has it been reclassified?

How do I find the correct country-specific version of HS code 730520?