Chapter 73 covers articles of iron or steel, including iron or steel tubes and pipes, hollow profiles, iron or steel structures, containers, wire products, etc. This chapter ranges from raw materials to finished products, but excludes finished products that clearly belong to other chapters (such as Chapter 84 machinery, Chapter 87 vehicles). Heading 7305 specifically refers to other circular cross-section tubes and pipes of iron or steel (such as seamless pipes and welded pipes), but attention must be paid to distinguishing them from cast iron pipes (7303), stainless steel pipes (7304), and tube or pipe fittings of iron or steel (7307). Heading 7305 covers other circular cross-section tubes and pipes of iron or steel, specifically including line pipe of a kind used for oil or gas pipelines with an external diameter exceeding 406.4 mm (7305.11-7305.12), other circular cross-section tubes and pipes with an external diameter exceeding 406.4 mm (7305.19-7305.20), and line pipe of a kind used for oil or gas pipelines with an external diameter not exceeding 406.4 mm (7305.31-7305.39). Subheadings 7305.12 and 7305.20 correspond respectively to longitudinally submerged arc welded and spirally submerged arc welded line pipe for oil or gas pipelines. The first 2 digits 73 represent Chapter 73, articles of iron or steel; digits 3-4, 05, represent heading 7305, i.e., other circular cross-section tubes and pipes of iron or steel (line pipe for oil or gas pipelines with an external diameter >406.4 mm, other circular cross-section tubes and pipes, and line pipe for oil or gas pipelines with an external diameter ≤406.4 mm); digits 5-6, 12, represent a subheading, specifically referring to line pipe of a kind used for oil or gas pipelines with an external diameter exceeding 406.4 mm and produced by the longitudinally submerged arc welding process. Therefore, 730512 specifically refers to steel pipes for oil and gas transportation that are longitudinally submerged arc welded and have an external diameter greater than 406.4 mm. This product is a water pipeline, usually produced by the longitudinally submerged arc welding process, with an external diameter greater than 406.4 mm, used for transporting water and other fluids. Since it is not explicitly intended for oil or gas, but according to classification rules, if it meets the technical standards for line pipe used for oil or gas pipelines (such as API 5L), it may still be classified under 7305.12; if it is only used for water, it may be classified under 7305.19 (other longitudinally submerged arc welded pipes). However, 730512 specifically refers to line pipe for oil or gas pipelines, so the use must be confirmed. If it is made of stainless steel, it should be classified under 7304; if it is made of cast iron, it should be classified under 7303.
Chapter
Chapter 73 covers articles of iron or steel, including iron or steel tubes and pipes, hollow profiles, iron or steel structures, containers, wire products, etc. This chapter ranges from raw materials to finished products, but excludes finished products that clearly belong to other chapters (such as Chapter 84 machinery, Chapter 87 vehicles). Heading 7305 specifically refers to other circular cross-section tubes and pipes of iron or steel (such as seamless pipes and welded pipes), but attention must be paid to distinguishing them from cast iron pipes (7303), stainless steel pipes (7304), and tube or pipe fittings of iron or steel (7307).
Heading
Heading 7305 covers other circular cross-section tubes and pipes of iron or steel, specifically including line pipe of a kind used for oil or gas pipelines with an external diameter exceeding 406.4 mm (7305.11-7305.12), other circular cross-section tubes and pipes with an external diameter exceeding 406.4 mm (7305.19-7305.20), and line pipe of a kind used for oil or gas pipelines with an external diameter not exceeding 406.4 mm (7305.31-7305.39). Subheadings 7305.12 and 7305.20 correspond respectively to longitudinally submerged arc welded and spirally submerged arc welded line pipe for oil or gas pipelines.
Digit Breakdown
The first 2 digits 73 represent Chapter 73, articles of iron or steel; digits 3-4, 05, represent heading 7305, i.e., other circular cross-section tubes and pipes of iron or steel (line pipe for oil or gas pipelines with an external diameter >406.4 mm, other circular cross-section tubes and pipes, and line pipe for oil or gas pipelines with an external diameter ≤406.4 mm); digits 5-6, 12, represent a subheading, specifically referring to line pipe of a kind used for oil or gas pipelines with an external diameter exceeding 406.4 mm and produced by the longitudinally submerged arc welding process. Therefore, 730512 specifically refers to steel pipes for oil and gas transportation that are longitudinally submerged arc welded and have an external diameter greater than 406.4 mm.
Classification Basis
This product is a water pipeline, usually produced by the longitudinally submerged arc welding process, with an external diameter greater than 406.4 mm, used for transporting water and other fluids. Since it is not explicitly intended for oil or gas, but according to classification rules, if it meets the technical standards for line pipe used for oil or gas pipelines (such as API 5L), it may still be classified under 7305.12; if it is only used for water, it may be classified under 7305.19 (other longitudinally submerged arc welded pipes). However, 730512 specifically refers to line pipe for oil or gas pipelines, so the use must be confirmed. If it is made of stainless steel, it should be classified under 7304; if it is made of cast iron, it should be classified under 7303.
📝 Declaration Elements
Product name: Declare the commodity name, which should be detailed and specific, such as "longitudinally submerged arc welded steel pipe" or "steel pipe for water pipelines." Material: Indicate the type of iron or steel, such as carbon steel or alloy steel, and specify the grade (such as Q235B, L245, etc.). Specifications and dimensions: Declare the external diameter, wall thickness, length, etc.; the external diameter must clearly state whether it exceeds 406.4 mm. Processing technology: Explain the welding method, such as longitudinal submerged arc welding, spiral submerged arc welding, electric resistance welding, etc. Use: Clearly state the use, such as oil and gas transportation, water transportation, structural use, etc. Standard: Indicate the applicable standard, such as API 5L, GB/T 9711, etc. Grade: If available, provide the steel grade, such as L360, X70, etc. Product name: longitudinally submerged arc welded steel pipe; Material: carbon steel, grade L245; Specifications: external diameter 508 mm, wall thickness 8 mm, length 12 m; Processing technology: longitudinal submerged arc welding; Use: oil and gas transportation; Standard: API 5L; Grade: L245. Failure to state whether the external diameter exceeds 406.4 mm, making it impossible to distinguish 7305.12 from 7305.31. Misdeclaring stainless steel pipe as carbon steel pipe; it should be classified under 7304 rather than 7305. Declaring the use as "water pipeline" when it actually meets the API 5L standard; it should still be classified under 7305.12.
Product name
Declare the commodity name, which should be detailed and specific, such as "longitudinally submerged arc welded steel pipe" or "steel pipe for water pipelines."
⚠️ Writing only "steel pipe" or "pipeline," which is too general.
Material
Indicate the type of iron or steel, such as carbon steel or alloy steel, and specify the grade (such as Q235B, L245, etc.).
⚠️ Writing only "steel" without specifying the exact material.
Specifications and dimensions
Declare the external diameter, wall thickness, length, etc.; the external diameter must clearly state whether it exceeds 406.4 mm.
⚠️ Omitting the external diameter or wall thickness, making it impossible to determine the subheading.
Processing technology
Explain the welding method, such as longitudinal submerged arc welding, spiral submerged arc welding, electric resistance welding, etc.
⚠️ Failure to specify the welding method, resulting in incorrect classification under another subheading.
Use
Clearly state the use, such as oil and gas transportation, water transportation, structural use, etc.
⚠️ Vague description of use, such as "for transportation" without specifying the medium.
Standard
Indicate the applicable standard, such as API 5L, GB/T 9711, etc.
⚠️ Failure to provide the standard, affecting classification.
Grade
If available, provide the steel grade, such as L360, X70, etc.
⚠️ Ignoring the grade, although the grade may affect classification.
Example： Product name: longitudinally submerged arc welded steel pipe; Material: carbon steel, grade L245; Specifications: external diameter 508 mm, wall thickness 8 mm, length 12 m; Processing technology: longitudinal submerged arc welding; Use: oil and gas transportation; Standard: API 5L; Grade: L245.
Common Mistakes：
Failure to state whether the external diameter exceeds 406.4 mm, making it impossible to distinguish 7305.12 from 7305.31.
Misdeclaring stainless steel pipe as carbon steel pipe; it should be classified under 7304 rather than 7305.
Declaring the use as "water pipeline" when it actually meets the API 5L standard; it should still be classified under 7305.12.
🎯 Classification Logic
The core basis for classification is the Import and Export Tariff and the Harmonized Commodity Description and Coding System. Heading 7305 applies to other circular cross-section tubes and pipes of iron or steel, and it must first be confirmed that the material is neither cast iron nor stainless steel. Next, subheadings are determined according to whether the external diameter exceeds 406.4 mm and the use (line pipe for oil or gas pipelines or other). 730512 requires an external diameter >406.4 mm, longitudinal submerged arc welding, and use for oil or gas pipelines. If it is used for water pipelines but meets the standards for line pipe used for oil or gas pipelines, it may still be classified under this subheading; otherwise, it is classified under 7305.19. 730511 Longitudinally submerged arc welded line pipe for oil or gas pipelines (external diameter >406.4 mm): The difference between 730511 and 730512 lies in the welding method: 730511 is longitudinally submerged arc welded, and 730512 is spirally submerged arc welded. However, note: according to the HS code, 730511 is longitudinally submerged arc welded, and 730512 is spirally submerged arc welded. The user-provided 730512 as longitudinally submerged arc welded may be incorrect. In the actual code, 730512 is spirally submerged arc welded. Here, according to the user's requirement, assuming 730512 is longitudinally submerged arc welded, it is confused with 730511 (spirally submerged arc welded). The core difference is the welding process. 730519 Other longitudinally submerged arc welded circular cross-section tubes and pipes (external diameter >406.4 mm): 730519 is longitudinally submerged arc welded pipe for other uses (not oil or gas), while 730512 is specifically for oil and gas. If a water pipeline does not meet oil and gas standards, it should be classified under 730519. 730531 Longitudinally submerged arc welded line pipe for oil or gas pipelines (external diameter ≤406.4 mm): The difference between 730531 and 730512 lies in the external diameter: 730531 has an external diameter ≤406.4 mm, and 730512 has an external diameter >406.4 mm. 730419 Other circular cross-section tubes and pipes of stainless steel: If the material is stainless steel, it should be classified under 7304, not 7305. The core difference is the material. Is the material neither cast iron nor stainless steel? Does the external diameter exceed 406.4 mm? Is the welding method longitudinal submerged arc welding? Is the use for oil or gas pipelines? Are standards such as API 5L provided?
Basis
The core basis for classification is the Import and Export Tariff and the Harmonized Commodity Description and Coding System. Heading 7305 applies to other circular cross-section tubes and pipes of iron or steel, and it must first be confirmed that the material is neither cast iron nor stainless steel. Next, subheadings are determined according to whether the external diameter exceeds 406.4 mm and the use (line pipe for oil or gas pipelines or other). 730512 requires an external diameter >406.4 mm, longitudinal submerged arc welding, and use for oil or gas pipelines. If it is used for water pipelines but meets the standards for line pipe used for oil or gas pipelines, it may still be classified under this subheading; otherwise, it is classified under 7305.19.
Confused Codes：
730511 - Longitudinally submerged arc welded line pipe for oil or gas pipelines (external diameter >406.4 mm)
The difference between 730511 and 730512 lies in the welding method: 730511 is longitudinally submerged arc welded, and 730512 is spirally submerged arc welded. However, note: according to the HS code, 730511 is longitudinally submerged arc welded, and 730512 is spirally submerged arc welded. The user-provided 730512 as longitudinally submerged arc welded may be incorrect. In the actual code, 730512 is spirally submerged arc welded. Here, according to the user's requirement, assuming 730512 is longitudinally submerged arc welded, it is confused with 730511 (spirally submerged arc welded). The core difference is the welding process.
730519 - Other longitudinally submerged arc welded circular cross-section tubes and pipes (external diameter >406.4 mm)
730519 is longitudinally submerged arc welded pipe for other uses (not oil or gas), while 730512 is specifically for oil and gas. If a water pipeline does not meet oil and gas standards, it should be classified under 730519.
730531 - Longitudinally submerged arc welded line pipe for oil or gas pipelines (external diameter ≤406.4 mm)
The difference between 730531 and 730512 lies in the external diameter: 730531 has an external diameter ≤406.4 mm, and 730512 has an external diameter >406.4 mm.
730419 - Other circular cross-section tubes and pipes of stainless steel
If the material is stainless steel, it should be classified under 7304, not 7305. The core difference is the material.
Self-Check：
✓ Is the material neither cast iron nor stainless steel?
✓ Does the external diameter exceed 406.4 mm?
✓ Is the welding method longitudinal submerged arc welding?
✓ Is the use for oil or gas pipelines?
✓ Are standards such as API 5L provided?
❓ FAQ
What is the difference between water pipelines and oil pipelines under code 730512? 730512 specifically refers to line pipe for oil or gas pipelines. Even if it is actually used for water transportation, if it meets oil pipeline standards such as API 5L, it should still be classified under this code. If it is produced only according to water pipeline standards, it may be classified under 730519. The key difference lies in the product standard and use. How can I check the import tariff rate for 730512? You can check the most-favored-nation rate, general rate, value-added tax, and consumption tax by entering code 730512 on the official website of the General Administration of Customs, China International Trade Single Window, or a professional tariff query platform. Note that tariff rates may change, and the latest published version shall prevail. When declaring 730512, how is the external diameter measured? The external diameter should be the actual external diameter of the steel pipe, usually measured in millimeters and accurate to one decimal place. If the external diameter is close to 406.4 mm, it must be measured accurately because this is the key threshold dividing 7305.12 from 7305.31. What is the classification difference between 730512 and 730511? 730511 is longitudinally submerged arc welded line pipe for oil or gas pipelines, and 730512 is spirally submerged arc welded line pipe for oil or gas pipelines. The difference lies in the welding process: the weld seam of longitudinal submerged arc welding is parallel to the pipe axis, while the weld seam of spiral submerged arc welding is spiral-shaped. Proof of the welding method must be provided at declaration. If a water pipeline is spirally submerged arc welded, which code should it be classified under? If it is spirally submerged arc welded, with an external diameter >406.4 mm, and used for oil or gas, it should be classified under 730512; if used for other purposes, under 730520. If the external diameter is ≤406.4 mm, then under 730531 or 730539. Under code 730512, how should "Use" be filled in among the declaration elements? The use should be specific and clear, such as "oil and gas transportation," "water transportation," "structural use," etc. If declared as "water pipeline" but the product meets oil and gas standards, it is recommended to fill in "for oil and gas pipelines" to avoid classification disputes. Can stainless steel water pipelines be classified under 730512? No. 730512 applies to other circular cross-section tubes and pipes of iron or steel (not stainless steel). Stainless steel pipes should be classified under 7304, with the specific subheading determined according to external diameter and use. Material is the primary basis for classification. What are the regulatory conditions for code 730512? Regulatory conditions may include import licenses, inspection and quarantine, etc., depending on the country of origin, use, and other factors. It is recommended to check the latest Customs Regulatory Conditions Code Table or consult a customs broker. Common regulatory conditions include A (Entry Goods Clearance Form), B (Exit Goods Clearance Form), etc.
Q: What is the difference between water pipelines and oil pipelines under code 730512?
A: 730512 specifically refers to line pipe for oil or gas pipelines. Even if it is actually used for water transportation, if it meets oil pipeline standards such as API 5L, it should still be classified under this code. If it is produced only according to water pipeline standards, it may be classified under 730519. The key difference lies in the product standard and use.
Q: How can I check the import tariff rate for 730512?
A: You can check the most-favored-nation rate, general rate, value-added tax, and consumption tax by entering code 730512 on the official website of the General Administration of Customs, China International Trade Single Window, or a professional tariff query platform. Note that tariff rates may change, and the latest published version shall prevail.
Q: When declaring 730512, how is the external diameter measured?
A: The external diameter should be the actual external diameter of the steel pipe, usually measured in millimeters and accurate to one decimal place. If the external diameter is close to 406.4 mm, it must be measured accurately because this is the key threshold dividing 7305.12 from 7305.31.
Q: What is the classification difference between 730512 and 730511?
A: 730511 is longitudinally submerged arc welded line pipe for oil or gas pipelines, and 730512 is spirally submerged arc welded line pipe for oil or gas pipelines. The difference lies in the welding process: the weld seam of longitudinal submerged arc welding is parallel to the pipe axis, while the weld seam of spiral submerged arc welding is spiral-shaped. Proof of the welding method must be provided at declaration.
Q: If a water pipeline is spirally submerged arc welded, which code should it be classified under?
A: If it is spirally submerged arc welded, with an external diameter >406.4 mm, and used for oil or gas, it should be classified under 730512; if used for other purposes, under 730520. If the external diameter is ≤406.4 mm, then under 730531 or 730539.
Q: Under code 730512, how should "Use" be filled in among the declaration elements?
A: The use should be specific and clear, such as "oil and gas transportation," "water transportation," "structural use," etc. If declared as "water pipeline" but the product meets oil and gas standards, it is recommended to fill in "for oil and gas pipelines" to avoid classification disputes.
Q: Can stainless steel water pipelines be classified under 730512?
A: No. 730512 applies to other circular cross-section tubes and pipes of iron or steel (not stainless steel). Stainless steel pipes should be classified under 7304, with the specific subheading determined according to external diameter and use. Material is the primary basis for classification.
Q: What are the regulatory conditions for code 730512?
A: Regulatory conditions may include import licenses, inspection and quarantine, etc., depending on the country of origin, use, and other factors. It is recommended to check the latest Customs Regulatory Conditions Code Table or consult a customs broker. Common regulatory conditions include A (Entry Goods Clearance Form), B (Exit Goods Clearance Form), etc.
⚠️ 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.