Chapter 73 covers iron and steel articles, including tubes, hollow profiles, tube fittings, structures, containers, cables, etc. This chapter primarily deals with iron and steel materials, but excludes finished products that clearly belong to other chapters (such as tools in Chapter 82, machinery in Chapter 84). Heading 7306 specifically covers other tubes and hollow profiles of iron or steel, such as welded tubes, riveted tubes, seamless tubes, etc. Heading 7306 covers other tubes and hollow profiles of iron or steel, including tubes closed by welding, riveting or similar methods, as well as tubes produced by non-welding methods (such as seamless), but excludes those processed into specific articles (such as seamless tubes of heading 7304, oil casing of heading 7305). Heading 7306 includes circular welded tubes, square welded tubes, profiled welded tubes, etc. Code 730661 consists of 6 digits. The first 2 digits 73 represent Chapter 73, iron and steel articles. Digits 3-4, 06, represent heading 7306, i.e., other tubes and hollow profiles of iron or steel. Digits 5-6, 61, represent subheading 730661, specifically referring to welded tubes of square or rectangular cross-section. The 5th digit 6 indicates welded tubes, and the 6th digit 1 indicates square or rectangular cross-section. Therefore, 730661 specifically refers to welded tubes of iron or steel with square or rectangular cross-section. This commodity is a square welded tube, belonging to welded tubes of iron or steel, with a square or rectangular cross-section, which conforms to the description of 730661. If it were a circular welded tube, it would be classified under 730630; if it were another profiled cross-section, it would be classified under 730669. If it were a seamless tube, it would be classified under 7304; if it were oil casing, it would be classified under 7305. Therefore, based on material, manufacturing method and cross-sectional shape, it is classified under 730661.
Chapter
Chapter 73 covers iron and steel articles, including tubes, hollow profiles, tube fittings, structures, containers, cables, etc. This chapter primarily deals with iron and steel materials, but excludes finished products that clearly belong to other chapters (such as tools in Chapter 82, machinery in Chapter 84). Heading 7306 specifically covers other tubes and hollow profiles of iron or steel, such as welded tubes, riveted tubes, seamless tubes, etc.
Heading
Heading 7306 covers other tubes and hollow profiles of iron or steel, including tubes closed by welding, riveting or similar methods, as well as tubes produced by non-welding methods (such as seamless), but excludes those processed into specific articles (such as seamless tubes of heading 7304, oil casing of heading 7305). Heading 7306 includes circular welded tubes, square welded tubes, profiled welded tubes, etc.
Digit Breakdown
Code 730661 consists of 6 digits. The first 2 digits 73 represent Chapter 73, iron and steel articles. Digits 3-4, 06, represent heading 7306, i.e., other tubes and hollow profiles of iron or steel. Digits 5-6, 61, represent subheading 730661, specifically referring to welded tubes of square or rectangular cross-section. The 5th digit 6 indicates welded tubes, and the 6th digit 1 indicates square or rectangular cross-section. Therefore, 730661 specifically refers to welded tubes of iron or steel with square or rectangular cross-section.
Classification Basis
This commodity is a square welded tube, belonging to welded tubes of iron or steel, with a square or rectangular cross-section, which conforms to the description of 730661. If it were a circular welded tube, it would be classified under 730630; if it were another profiled cross-section, it would be classified under 730669. If it were a seamless tube, it would be classified under 7304; if it were oil casing, it would be classified under 7305. Therefore, based on material, manufacturing method and cross-sectional shape, it is classified under 730661.
📝 Declaration Elements
Product Name: Declare the commodity name accurately as "square welded tube" or "rectangular welded tube"; avoid the generic term "steel pipe". Material: Indicate the type of iron or steel, such as "carbon steel", "stainless steel", etc. For stainless steel, indicate carbon content and alloying elements. Specifications and Dimensions: Fill in outer diameter, wall thickness, length, etc. For square tubes, indicate side length and wall thickness. Manufacturing Process: Explain the welding method, such as "high-frequency welding", "arc welding", etc., and whether subsequent processing has been applied. Cross-sectional Shape: Specify as square or rectangular, and indicate specific dimensions (e.g., 20mm×20mm). Use: Declare the primary use, such as "structural use", "fluid conveyance", etc., which affects classification. Grade: Fill in the steel grade, such as Q235B, 304, etc., to facilitate determination of material. Product Name: Square welded tube; Material: Carbon steel; Specifications: Side length 40mm, wall thickness 2mm, length 6m; Manufacturing Process: High-frequency welding; Cross-sectional Shape: Square; Use: Building structure; Grade: Q235B. Misclassifying square welded tubes under 730630 (circular welded tubes), resulting in tariff rate differences. Neglecting to declare cross-sectional shape and only writing "welded tube", which may lead customs to question the classification. Not indicating whether the material is stainless steel; stainless steel tubes are classified under 730661 but with different tariff rates.
Product Name
Declare the commodity name accurately as "square welded tube" or "rectangular welded tube"; avoid the generic term "steel pipe".
⚠️ Incorrectly declared as "seamless tube" or "round tube".
Material
Indicate the type of iron or steel, such as "carbon steel", "stainless steel", etc. For stainless steel, indicate carbon content and alloying elements.
⚠️ Only writing "steel" without distinguishing carbon steel from stainless steel.
Specifications and Dimensions
Fill in outer diameter, wall thickness, length, etc. For square tubes, indicate side length and wall thickness.
⚠️ Only writing "square" without providing specific side length and wall thickness.
Manufacturing Process
Explain the welding method, such as "high-frequency welding", "arc welding", etc., and whether subsequent processing has been applied.
⚠️ Not indicating the welding method, or incorrectly writing "seamless".
Cross-sectional Shape
Specify as square or rectangular, and indicate specific dimensions (e.g., 20mm×20mm).
⚠️ Confusing square with rectangular, or not indicating cross-sectional dimensions.
Use
Declare the primary use, such as "structural use", "fluid conveyance", etc., which affects classification.
⚠️ Use description too broad, such as "industrial use".
Grade
Fill in the steel grade, such as Q235B, 304, etc., to facilitate determination of material.
⚠️ Not providing a grade or providing an incorrect grade.
Misclassifying square welded tubes under 730630 (circular welded tubes), resulting in tariff rate differences.
Neglecting to declare cross-sectional shape and only writing "welded tube", which may lead customs to question the classification.
Not indicating whether the material is stainless steel; stainless steel tubes are classified under 730661 but with different tariff rates.
🎯 Classification Logic
The core basis for classification is: 1) material is iron or steel; 2) manufacturing method is welding; 3) cross-section is square or rectangular. At the same time, cases where the tube has been processed into specific articles (such as furniture tubes, structural components) must be excluded. If the tube has undergone further processing (such as galvanizing, plastic coating), it is still classified under 730661, but this must be indicated in the declaration. 730630 Circular welded tubes: Cross-section is circular, whereas 730661 is square or rectangular; cross-sectional shape is the main distinguishing point. 730669 Other profiled welded tubes: Cross-section is not circular, square or rectangular, such as oval, triangular, etc., classified under 730669. 730419 Other seamless tubes: Manufacturing method is seamless, whereas 730661 is welded tubes; the process is different. 730511 Oil and gas casing: Used for oil and gas drilling, with specific standards, whereas 730661 is general-purpose square tubes. 730690 Other tubes of iron or steel: Includes tubes closed by riveting or other methods, but not welded, and the cross-section may not be square. Confirm the material is iron or steel, and not stainless steel (if stainless steel, note the subheading). Confirm the manufacturing method is welding, not seamless. Confirm the cross-section is square or rectangular, not circular or other profiled shapes. Confirm it has not been further processed into other articles (such as furniture, structural components). Confirm the use is not for specific purposes such as oil and gas drilling.
Basis
The core basis for classification is: 1) material is iron or steel; 2) manufacturing method is welding; 3) cross-section is square or rectangular. At the same time, cases where the tube has been processed into specific articles (such as furniture tubes, structural components) must be excluded. If the tube has undergone further processing (such as galvanizing, plastic coating), it is still classified under 730661, but this must be indicated in the declaration.
Confused Codes：
730630 - Circular welded tubes
Cross-section is circular, whereas 730661 is square or rectangular; cross-sectional shape is the main distinguishing point.
730669 - Other profiled welded tubes
Cross-section is not circular, square or rectangular, such as oval, triangular, etc., classified under 730669.
730419 - Other seamless tubes
Manufacturing method is seamless, whereas 730661 is welded tubes; the process is different.
730511 - Oil and gas casing
Used for oil and gas drilling, with specific standards, whereas 730661 is general-purpose square tubes.
730690 - Other tubes of iron or steel
Includes tubes closed by riveting or other methods, but not welded, and the cross-section may not be square.
Self-Check：
✓ Confirm the material is iron or steel, and not stainless steel (if stainless steel, note the subheading).
✓ Confirm the manufacturing method is welding, not seamless.
✓ Confirm the cross-section is square or rectangular, not circular or other profiled shapes.
✓ Confirm it has not been further processed into other articles (such as furniture, structural components).
✓ Confirm the use is not for specific purposes such as oil and gas drilling.
❓ FAQ
Are both square welded tubes and rectangular welded tubes classified under 730661? Yes, 730661 covers welded tubes of square and rectangular cross-section. However, the specific shape and dimensions must be clearly declared so that customs can confirm. Are stainless steel square welded tubes also classified under 730661? Yes, but note that stainless steel tubes may involve other subheadings, such as further subdivisions under 730661. It is recommended to consult the latest tariff schedule to confirm the specific code for stainless steel. If a square welded tube is galvanized, will the code change? No, galvanizing is a surface treatment that does not change the essential characteristics, and it is still classified under 730661. However, galvanizing must be indicated in the declaration for customs review. How to distinguish between 730661 and 730669? 730661 specifically refers to square or rectangular cross-section, while 730669 refers to other profiled cross-sections (such as oval, triangular). Cross-sectional shape is the sole distinguishing criterion. If a square welded tube is used for furniture, is the code different? If it has been processed into furniture parts or furniture, it may be classified under Chapter 94. But if it is only tubing, it is still classified under 730661. The determination depends on the degree of processing. How to fill in specifications and dimensions when declaring? Side length, wall thickness and length should be filled in, such as "40mm×40mm×2mm×6000mm". Avoid only writing "square tube". How to check the tariff rate for 730661? You can check the MFN rate, general rate, etc. by entering the code on the website of the General Administration of Customs of China or a tariff query tool. Tariff rates may change, and the latest announcement shall prevail. What documents are required for exporting square welded tubes? Generally, invoices, packing lists, contracts, customs declarations, and possibly quality certificates are required. If licenses are involved, they must be obtained in advance.
Q: Are both square welded tubes and rectangular welded tubes classified under 730661?
A: Yes, 730661 covers welded tubes of square and rectangular cross-section. However, the specific shape and dimensions must be clearly declared so that customs can confirm.
Q: Are stainless steel square welded tubes also classified under 730661?
A: Yes, but note that stainless steel tubes may involve other subheadings, such as further subdivisions under 730661. It is recommended to consult the latest tariff schedule to confirm the specific code for stainless steel.
Q: If a square welded tube is galvanized, will the code change?
A: No, galvanizing is a surface treatment that does not change the essential characteristics, and it is still classified under 730661. However, galvanizing must be indicated in the declaration for customs review.
Q: How to distinguish between 730661 and 730669?
A: 730661 specifically refers to square or rectangular cross-section, while 730669 refers to other profiled cross-sections (such as oval, triangular). Cross-sectional shape is the sole distinguishing criterion.
Q: If a square welded tube is used for furniture, is the code different?
A: If it has been processed into furniture parts or furniture, it may be classified under Chapter 94. But if it is only tubing, it is still classified under 730661. The determination depends on the degree of processing.
Q: How to fill in specifications and dimensions when declaring?
A: Side length, wall thickness and length should be filled in, such as "40mm×40mm×2mm×6000mm". Avoid only writing "square tube".
Q: How to check the tariff rate for 730661?
A: You can check the MFN rate, general rate, etc. by entering the code on the website of the General Administration of Customs of China or a tariff query tool. Tariff rates may change, and the latest announcement shall prevail.
Q: What documents are required for exporting square welded tubes?
A: Generally, invoices, packing lists, contracts, customs declarations, and possibly quality certificates are required. If licenses are involved, they must be obtained in advance.
⚠️ Disclaimer: HS code classification, declaration elements, tariff rates and regulatory conditions on this page are for reference only and do not constitute legal advice on customs classification. Tariff rates and regulations are subject to change; the latest announcements from the General Administration of Customs and on-site determinations shall prevail. Please consult professional customs brokers or customs authorities before import/export.