Chapter 73 covers articles of iron or steel, including seamless pipes, welded pipes, hollow profiles, pipe fittings, structural components, containers, wire ropes, etc. This chapter is based on iron and steel materials, and covers various articles made through casting, forging, welding, machining, and other processes. Note the distinction from Chapter 72 (iron and steel raw materials and primary products): Chapter 72 only includes steelmaking and rolled semi-finished products, while Chapter 73 covers pipes, plates, profiles, and other finished or semi-finished products made through further processing. Heading 7305 specifically refers to other tubes and pipes of circular cross-section of iron or steel (for example, welded, riveted or similarly closed), not further worked or only surface-treated. It includes oil and gas pipelines, boiler tubes, structural tubes, etc. Note: 7305 does not include seamless pipes (classified under 7304), nor does it include precision pipes already fitted with pipe fittings or that have been cold-drawn or cold-rolled (classified under 7306). The first 2 digits 73 = articles of iron or steel; digits 3-4, 05 = other tubes and pipes of circular cross-section of iron or steel (welded, etc.); digits 5-6, 31 = threaded welded tubes, i.e., welded steel pipes with threaded ends, usually used for pipe connections. This subheading specifically refers to threaded welded pipes with an outer diameter not exceeding 406.4mm, distinguished from non-threaded welded pipes (7305.39) and larger-diameter ones (7305.90). The product is a welded steel pipe with threaded ends for threaded connections, so it is classified under 7305.31. If it were a seamless pipe, it would be classified under 7304; if it had been further worked (such as cold-drawn or threaded after galvanizing), it might be classified under 7306; if the diameter exceeds 406.4mm, it would be classified under 7305.90.
Chapter
Chapter 73 covers articles of iron or steel, including seamless pipes, welded pipes, hollow profiles, pipe fittings, structural components, containers, wire ropes, etc. This chapter is based on iron and steel materials, and covers various articles made through casting, forging, welding, machining, and other processes. Note the distinction from Chapter 72 (iron and steel raw materials and primary products): Chapter 72 only includes steelmaking and rolled semi-finished products, while Chapter 73 covers pipes, plates, profiles, and other finished or semi-finished products made through further processing.
Heading
Heading 7305 specifically refers to other tubes and pipes of circular cross-section of iron or steel (for example, welded, riveted or similarly closed), not further worked or only surface-treated. It includes oil and gas pipelines, boiler tubes, structural tubes, etc. Note: 7305 does not include seamless pipes (classified under 7304), nor does it include precision pipes already fitted with pipe fittings or that have been cold-drawn or cold-rolled (classified under 7306).
Digit Breakdown
The first 2 digits 73 = articles of iron or steel; digits 3-4, 05 = other tubes and pipes of circular cross-section of iron or steel (welded, etc.); digits 5-6, 31 = threaded welded tubes, i.e., welded steel pipes with threaded ends, usually used for pipe connections. This subheading specifically refers to threaded welded pipes with an outer diameter not exceeding 406.4mm, distinguished from non-threaded welded pipes (7305.39) and larger-diameter ones (7305.90).
Classification Basis
The product is a welded steel pipe with threaded ends for threaded connections, so it is classified under 7305.31. If it were a seamless pipe, it would be classified under 7304; if it had been further worked (such as cold-drawn or threaded after galvanizing), it might be classified under 7306; if the diameter exceeds 406.4mm, it would be classified under 7305.90.
📝 Declaration Elements
Product name: The standard name of the declared product, which should be stated as "threaded welded pipe" or "galvanized threaded welded pipe", etc., avoiding the generic term "steel pipe". Material: State the type of iron or steel, such as "carbon steel" or "alloy steel", and specify the grade (such as Q235, 20#). Specifications and dimensions: Declare the outer diameter, wall thickness, and length, and whether the outer diameter is ≤406.4mm, in millimeters. Processing technology: State the welding method (such as high-frequency welding, submerged arc welding) and whether it is threaded, and the thread type (such as NPT, BSP). Surface treatment: Such as galvanizing, plastic coating, oil coating, etc., which affects whether it constitutes further working. Use: Such as for oil pipelines, water and gas pipelines, structural support, etc. Brand and model: If there is a brand and model, they must be declared for identification. Product name: Galvanized threaded welded pipe; Material: Carbon steel Q235; Specifications: Outer diameter 114.3mm, wall thickness 4mm, length 6m; Processing technology: High-frequency welding, pipe ends threaded (NPT); Surface treatment: Hot-dip galvanizing; Use: Water and gas pipeline; Brand: XX; Model: XX. Incorrectly declaring a seamless pipe as a welded pipe, leading to classification errors. Ignoring the outer diameter dimension, which may result in incorrect classification under 7305.90. Incorrectly classifying a threaded welded pipe under 7306.30 (other welded pipes).
Product name
The standard name of the declared product, which should be stated as "threaded welded pipe" or "galvanized threaded welded pipe", etc., avoiding the generic term "steel pipe".
⚠️ Incorrectly writing it as "welded steel pipe" or "seamless steel pipe", leading to classification errors.
Material
State the type of iron or steel, such as "carbon steel" or "alloy steel", and specify the grade (such as Q235, 20#).
⚠️ Only writing "steel" without distinguishing between carbon steel and alloy steel.
Specifications and dimensions
Declare the outer diameter, wall thickness, and length, and whether the outer diameter is ≤406.4mm, in millimeters.
⚠️ Omitting the outer diameter or wall thickness, making it impossible to determine whether it falls under this subheading.
Processing technology
State the welding method (such as high-frequency welding, submerged arc welding) and whether it is threaded, and the thread type (such as NPT, BSP).
⚠️ Failing to state thread processing, incorrectly classifying it under a non-threaded subheading.
Surface treatment
Such as galvanizing, plastic coating, oil coating, etc., which affects whether it constitutes further working.
⚠️ Incorrectly classifying galvanized threaded pipes under 7306.
Use
Such as for oil pipelines, water and gas pipelines, structural support, etc.
⚠️ Vague description of use, which cannot assist in determination.
Brand and model
If there is a brand and model, they must be declared for identification.
⚠️ Ignoring brand and model, affecting price and classification.
Incorrectly declaring a seamless pipe as a welded pipe, leading to classification errors.
Ignoring the outer diameter dimension, which may result in incorrect classification under 7305.90.
Incorrectly classifying a threaded welded pipe under 7306.30 (other welded pipes).
🎯 Classification Logic
Core basis for classification: 1) Material is iron or steel; 2) Circular cross-section; 3) Made by welding process; 4) Pipe ends are threaded; 5) Outer diameter not exceeding 406.4mm. It is also necessary to confirm whether it has undergone further working (such as cold-drawing, cold-rolling, or threading after galvanizing). If it is only threaded after welding, it is still classified under 7305.31; if it is cold-drawn after welding and then threaded, it is classified under 7306. 7304.31 Seamless steel pipes: Seamless pipes are made by piercing and rolling, with no weld seam; threaded welded pipes have a weld seam and are threaded. 7305.39 Other welded pipes: Non-threaded welded pipes, with no threads at the pipe ends, used only for welding or other connections. 7305.90 Other welded pipes of circular cross-section: Welded pipes with an outer diameter exceeding 406.4mm, whether threaded or not. 7306.30 Other welded pipes (further worked): Further worked by cold-drawing, cold-rolling, etc., or threaded after galvanizing, beyond the scope of 7305. Is it made of iron or steel? Is it of circular cross-section? Is it made by a welding process? Are the pipe ends threaded? Is the outer diameter ≤406.4mm?
Basis
Core basis for classification: 1) Material is iron or steel; 2) Circular cross-section; 3) Made by welding process; 4) Pipe ends are threaded; 5) Outer diameter not exceeding 406.4mm. It is also necessary to confirm whether it has undergone further working (such as cold-drawing, cold-rolling, or threading after galvanizing). If it is only threaded after welding, it is still classified under 7305.31; if it is cold-drawn after welding and then threaded, it is classified under 7306.
Confused Codes：
7304.31 - Seamless steel pipes
Seamless pipes are made by piercing and rolling, with no weld seam; threaded welded pipes have a weld seam and are threaded.
7305.39 - Other welded pipes
Non-threaded welded pipes, with no threads at the pipe ends, used only for welding or other connections.
7305.90 - Other welded pipes of circular cross-section
Welded pipes with an outer diameter exceeding 406.4mm, whether threaded or not.
7306.30 - Other welded pipes (further worked)
Further worked by cold-drawing, cold-rolling, etc., or threaded after galvanizing, beyond the scope of 7305.
Self-Check：
✓ Is it made of iron or steel?
✓ Is it of circular cross-section?
✓ Is it made by a welding process?
✓ Are the pipe ends threaded?
✓ Is the outer diameter ≤406.4mm?
❓ FAQ
How do I look up the HS code for threaded welded pipes? First confirm that the material is iron or steel, the cross-section is circular, the process is welding, it is threaded, and the outer diameter is ≤406.4mm, then classify under 7305.31. If the outer diameter is >406.4mm, classify under 7305.90; if it has undergone further working such as cold-drawing, classify under 7306. Are the codes for threaded welded pipes and galvanized threaded welded pipes the same? If it is only threaded after galvanizing without cold-drawing, etc., it is still classified under 7305.31; if it was cold-drawn before galvanizing, it is classified under 7306. Note that galvanizing itself does not change the classification, but the order of processing affects it. How does the outer diameter dimension affect classification at declaration? Threaded welded pipes with an outer diameter ≤406.4mm are classified under 7305.31; those with an outer diameter >406.4mm are classified under 7305.90. Therefore, the outer diameter must be accurately provided at declaration. Does the thread type affect the HS code? The thread type (such as NPT, BSP) does not affect the HS code; as long as the pipe ends are threaded, it is classified under 7305.31. However, it should be truthfully filled in at declaration to facilitate customs inspection. If a welded pipe is threaded but used for structural support, is the code different? The HS code is classified according to product characteristics and is unrelated to use. As long as it meets the criteria of being welded, threaded, and having an outer diameter ≤406.4mm, it is classified under 7305.31, and use does not affect it. What declaration elements are required for importing threaded welded pipes? Product name, material, specifications and dimensions (outer diameter, wall thickness), processing technology (welding method, thread type), surface treatment, use, brand and model, etc. are required. The specific requirements are subject to customs. If a threaded welded pipe has undergone cold-drawing, how does the code change? If it has undergone cold-drawing or cold-rolling after welding, it exceeds the scope of 7305 and should be classified under 7306, with the specific subheading determined according to outer diameter and use. How do I distinguish between 7305.31 and 7306.30? 7305.31 refers to pipes that are only threaded after welding without further working; 7306.30 refers to pipes that have undergone further working such as cold-drawing or cold-rolling after welding, or threading after galvanizing. The key is whether the pipe dimensions or properties have been changed.
Q: How do I look up the HS code for threaded welded pipes?
A: First confirm that the material is iron or steel, the cross-section is circular, the process is welding, it is threaded, and the outer diameter is ≤406.4mm, then classify under 7305.31. If the outer diameter is >406.4mm, classify under 7305.90; if it has undergone further working such as cold-drawing, classify under 7306.
Q: Are the codes for threaded welded pipes and galvanized threaded welded pipes the same?
A: If it is only threaded after galvanizing without cold-drawing, etc., it is still classified under 7305.31; if it was cold-drawn before galvanizing, it is classified under 7306. Note that galvanizing itself does not change the classification, but the order of processing affects it.
Q: How does the outer diameter dimension affect classification at declaration?
A: Threaded welded pipes with an outer diameter ≤406.4mm are classified under 7305.31; those with an outer diameter >406.4mm are classified under 7305.90. Therefore, the outer diameter must be accurately provided at declaration.
Q: Does the thread type affect the HS code?
A: The thread type (such as NPT, BSP) does not affect the HS code; as long as the pipe ends are threaded, it is classified under 7305.31. However, it should be truthfully filled in at declaration to facilitate customs inspection.
Q: If a welded pipe is threaded but used for structural support, is the code different?
A: The HS code is classified according to product characteristics and is unrelated to use. As long as it meets the criteria of being welded, threaded, and having an outer diameter ≤406.4mm, it is classified under 7305.31, and use does not affect it.
Q: What declaration elements are required for importing threaded welded pipes?
A: Product name, material, specifications and dimensions (outer diameter, wall thickness), processing technology (welding method, thread type), surface treatment, use, brand and model, etc. are required. The specific requirements are subject to customs.
Q: If a threaded welded pipe has undergone cold-drawing, how does the code change?
A: If it has undergone cold-drawing or cold-rolling after welding, it exceeds the scope of 7305 and should be classified under 7306, with the specific subheading determined according to outer diameter and use.
Q: How do I distinguish between 7305.31 and 7306.30?
A: 7305.31 refers to pipes that are only threaded after welding without further working; 7306.30 refers to pipes that have undergone further working such as cold-drawing or cold-rolling after welding, or threading after galvanizing. The key is whether the pipe dimensions or properties have been changed.
⚠️ 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.