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Square tube hs code guide: hs code 730661

When importing or exporting square steel tubes, selecting the correct HS Code is essential for customs clearance, duty calculation, and international trade compliance. Incorrect tariff classification can lead to customs inspections, shipment delays, additional costs, or even penalties.

For most welded carbon steel square tubes, including Square Hollow Sections (SHS) and Rectangular Hollow Sections (RHS), the internationally recognized HS Code 730661 is the standard customs classification. However, importers and exporters should understand how this code applies, what supporting documents are required, and which common classification mistakes should be avoided.

This guide explains everything you need to know about Square Tube HS Code 730661 from an international trade perspective.

What Is the HS Code for Square Tube?

The Harmonized System (HS) Code is an internationally standardized product classification system administered by the World Customs Organization (WCO). It allows customs authorities around the world to identify products consistently for tariff assessment and trade statistics.

For most welded non-alloy steel square and rectangular hollow sections, the applicable six-digit customs code is:

HS Code 730661–Welded square and rectangular tubes and hollow sections of iron or non-alloy steel

This code generally covers products manufactured by welding steel strip or plate into square or rectangular hollow sections.

Although the first six digits are internationally standardized, many countries extend the code with additional tariff digits (such as 73066100, 73066190, or other national classifications) for customs administration and statistical reporting. Importers should always confirm the complete tariff code required by the destination country's customs authority.

Square Tube HS Code Reference Table

The following table summarizes the HS codes commonly used for square and rectangular welded steel tubes.

Note: HS Code 730661 generally applies to welded square or rectangular hollow sections manufactured from non-alloy steel. Country-specific tariff schedules may require additional digits for customs declaration.

Which Products Are Covered by HS Code 730661?

HS Code 730661 is commonly used for a wide variety of welded structural tubing, including:

Carbon steel square tubes

Galvanized square steel tubes

Square Hollow Sections (SHS)

Rectangular Hollow Sections (RHS)

Structural welded hollow sections

Construction steel tubing

Industrial welded square tubing

These products are widely used in:

Building construction

Steel structures

Warehouses

Machinery manufacturing

Infrastructure projects

Agricultural equipment

Solar mounting systems

Customs Documents Required for Square Tube Imports and Exports

Using the correct HS code is only one part of a successful customs declaration. Most customs authorities also require supporting documentation to verify product specifications and origin.

Best Practice

Ensure that the product description is identical across the Commercial Invoice, Packing List, Mill Test Certificate, and shipping documents. Consistent documentation helps reduce customs queries and accelerates clearance.

Common HS Code Classification Mistakes

Incorrect customs declarations remain one of the most common causes of shipment delays. Below are several mistakes that exporters and importers should avoid.

1. Using Generic Product Descriptions

Avoid declaring products simply as "Steel Tube."

Instead, provide a complete description such as:

Carbon Steel Square Tube

Square Hollow Section (SHS)

Rectangular Hollow Section (RHS)

Galvanized Square Steel Tube

More detailed descriptions improve customs accuracy and reduce the likelihood of inspection.

2. Inconsistent Product Information

The product description should remain consistent across:

Commercial Invoice

Packing List

Mill Test Certificate

Bill of Lading

Technical Specification

Differences between documents may trigger customs verification or clearance delays.

3. Using Outdated Tariff Codes

Many countries periodically update their tariff schedules.

Before shipment, always verify:

Latest national tariff codes

Import regulations

Duty rates

Trade agreements

Consulting the destination country's customs authority helps ensure compliance.

4. Confusing Welded and Seamless Pipe Classifications

A common declaration error is using the HS code for seamless steel pipes instead of welded square tubes.

Classification is based primarily on:

Manufacturing method

Product shape

Material category

Since welded and seamless tubes belong to different HS headings, using the wrong code can result in incorrect duty assessment and customs disputes.

Tips for Accurate Customs Declaration

To improve customs efficiency when shipping square steel tubes:

Confirm the manufacturing process (welded or seamless).

Identify the correct product shape (SHS or RHS).

Verify the applicable steel grade.

Use consistent product descriptions across all documents.

Check the latest tariff schedule of the importing country before shipment.

Following these steps helps reduce customs risks and supports smoother international trade.

FAQs

1. What is the HS code for square steel tubes?

Most welded carbon steel square and rectangular hollow sections are classified under HS Code 730661.

2. Does HS Code 730661 include galvanized square tubes?

Yes. In most countries, galvanized welded square tubes are also classified under 730661.

3. Does pipe size affect the HS code?

No. HS classification is generally based on the product type and manufacturing method, not the size or wall thickness.

4. What documents are required for customs clearance?

Commercial Invoice, Packing List, Mill Test Certificate (MTC), and other documents required by the destination country.

5. Can HS codes vary by country?

Yes. The first six digits are standardized internationally, while many countries add additional tariff digits for local customs purposes.

Conclusion

For international trade involving Square Hollow Sections (SHS) and Rectangular Hollow Sections (RHS), HS Code 730661 is the most commonly used classification for welded non-alloy steel square and rectangular tubes. Correct tariff classification, complete documentation, and consistent product descriptions are essential for efficient customs clearance and regulatory compliance.

Whether exporting carbon steel square tubes, galvanized square tubes, or other welded structural hollow sections, understanding the applicable HS code and preparing accurate customs documents can help minimize clearance delays, avoid classification disputes, and support smooth global trade operations.