Chapter 73 covers articles of iron or steel, but excludes raw materials for iron and steel smelting (Chapter 72) and specific iron or steel articles classified in other chapters (such as machine parts, vehicle parts, etc.). This chapter includes pipe fittings, structural components, containers, household iron and steel utensils, etc. 7307 covers iron or steel pipe fittings, including joints, elbows, flanges, etc., made by casting, forging, welding, or other processes. Heading 7307 covers iron or steel pipe fittings used to connect, branch, reduce, or close pipelines. It includes flanges, elbows, tees, reducers, caps, etc., whether or not machined, but must not be fitted with valves or other devices. 7307 is subdivided by manufacturing process and material, such as cast, forged, welded, etc. First 2 digits 73: Chapter 73, articles of iron or steel. Digits 3-4, 07: Heading 7307, iron or steel pipe fittings. Digits 5-6, 93: Subheading 7307.93, specifically carbon steel welded fittings. The 5th digit 9 indicates other pipe fittings (not cast, not forged), and the 6th digit 3 indicates welded fittings. Therefore, 730793 specifically refers to welded fittings made of carbon steel, such as butt-welding elbows, tees, etc. This commodity is a carbon steel welded fitting, manufactured by welding process, used for pipeline connection. It does not meet the definition of cast (7307.11/19) or forged (7307.91/92), nor does it belong to stainless steel (7307.21/22). Therefore, it is classified under 7307.93, i.e., other carbon steel welded pipe fittings.
Chapter
Chapter 73 covers articles of iron or steel, but excludes raw materials for iron and steel smelting (Chapter 72) and specific iron or steel articles classified in other chapters (such as machine parts, vehicle parts, etc.). This chapter includes pipe fittings, structural components, containers, household iron and steel utensils, etc. 7307 covers iron or steel pipe fittings, including joints, elbows, flanges, etc., made by casting, forging, welding, or other processes.
Heading
Heading 7307 covers iron or steel pipe fittings used to connect, branch, reduce, or close pipelines. It includes flanges, elbows, tees, reducers, caps, etc., whether or not machined, but must not be fitted with valves or other devices. 7307 is subdivided by manufacturing process and material, such as cast, forged, welded, etc.
Digit Breakdown
First 2 digits 73: Chapter 73, articles of iron or steel. Digits 3-4, 07: Heading 7307, iron or steel pipe fittings. Digits 5-6, 93: Subheading 7307.93, specifically carbon steel welded fittings. The 5th digit 9 indicates other pipe fittings (not cast, not forged), and the 6th digit 3 indicates welded fittings. Therefore, 730793 specifically refers to welded fittings made of carbon steel, such as butt-welding elbows, tees, etc.
Classification Basis
This commodity is a carbon steel welded fitting, manufactured by welding process, used for pipeline connection. It does not meet the definition of cast (7307.11/19) or forged (7307.91/92), nor does it belong to stainless steel (7307.21/22). Therefore, it is classified under 7307.93, i.e., other carbon steel welded pipe fittings.
📝 Declaration Elements
Product Name: The specific name of the declared commodity, such as "carbon steel welded elbow," "carbon steel welded tee," etc., must be consistent with the actual product. Material: Specify the specific grade or composition of carbon steel, such as ASTM A234 WPB, 20# steel, etc., avoiding merely writing "carbon steel." Process: State the manufacturing process, such as welding, casting, forging, etc. For welded fittings, specify "welded" or "butt-welded." Type: Specific type, such as elbow, tee, reducer, cap, etc., must correspond to the HS subheading. Specifications and Dimensions: Nominal diameter, wall thickness, angle, etc., such as DN100, Sch40, 90°, etc. Standard: The applicable standard number, such as GB/T 12459, ASME B16.9, etc., which helps confirm classification. Use: Briefly describe the use, such as petroleum pipeline, chemical pipeline, etc., but not too broad. Product Name: Carbon steel welded elbow; Material: ASTM A234 WPB; Process: Welded; Type: 90° butt-welding elbow; Specifications: DN100 Sch40; Standard: ASME B16.9; Use: Petroleum pipeline connection. Misclassifying carbon steel welded fittings under 7307.91 (forged) or 7307.99 (other), ignoring the welding process. Declaring the material as "alloy steel" or "stainless steel," leading to subheading errors. Failure to distinguish between butt-welding and socket-welding, affecting classification and declaration elements.
Product Name
The specific name of the declared commodity, such as "carbon steel welded elbow," "carbon steel welded tee," etc., must be consistent with the actual product.
⚠️ Declaring it generically as "pipe fitting" or "joint" without specifying material and process.
Material
Specify the specific grade or composition of carbon steel, such as ASTM A234 WPB, 20# steel, etc., avoiding merely writing "carbon steel."
⚠️ Only writing "carbon steel" without providing standard or grade, leading to classification disputes.
Process
State the manufacturing process, such as welding, casting, forging, etc. For welded fittings, specify "welded" or "butt-welded."
⚠️ Misreporting the welding process as casting or forging, affecting subheading classification.
Type
Specific type, such as elbow, tee, reducer, cap, etc., must correspond to the HS subheading.
⚠️ Reporting an elbow as a tee, or failing to distinguish between butt-welding and socket-welding.
Specifications and Dimensions
Nominal diameter, wall thickness, angle, etc., such as DN100, Sch40, 90°, etc.
⚠️ Inconsistent units of measurement, or failure to provide wall thickness grade.
Standard
The applicable standard number, such as GB/T 12459, ASME B16.9, etc., which helps confirm classification.
⚠️ Failure to provide the standard, or the standard does not match the actual product.
Use
Briefly describe the use, such as petroleum pipeline, chemical pipeline, etc., but not too broad.
⚠️ Use description is too general, such as "industrial use."
Misclassifying carbon steel welded fittings under 7307.91 (forged) or 7307.99 (other), ignoring the welding process.
Declaring the material as "alloy steel" or "stainless steel," leading to subheading errors.
Failure to distinguish between butt-welding and socket-welding, affecting classification and declaration elements.
🎯 Classification Logic
The core basis for classification is: 1) Material is carbon steel (not stainless steel, not alloy steel); 2) Manufacturing process is welding (not casting, not forging); 3) It is a pipe fitting (used to connect pipelines). Reference should also be made to the Import and Export Tariff and its notes to ensure compliance with the description of 7307.93. 730791 Other carbon steel flanges: 730791 covers carbon steel flanges, regardless of process, but flanges are disc-shaped parts used to connect pipe ends or equipment, whereas 730793 covers welded fittings such as elbows, tees, etc. 730792 Other carbon steel threaded fittings: 730792 covers carbon steel threaded fittings, connected by threads, whereas 730793 covers welded fittings, connected by welding. 730799 Other carbon steel pipe fittings: 730799 covers other carbon steel pipe fittings not elsewhere specified, such as socket-welding fittings, ferrule fittings, etc., whereas 730793 specifically refers to welded fittings (butt-welding). 730711 Cast malleable cast iron pipe fittings: 730711 covers cast malleable cast iron, with different material and process; carbon steel welded fittings are classified under 730793. 730721 Stainless steel flanges: 730721 covers stainless steel flanges, with stainless steel as the material, whereas 730793 covers carbon steel welded fittings. Is the material carbon steel? Is the process welding? Is it a pipe fitting? Is it used to connect pipelines? Are flanges and threaded fittings excluded?
Basis
The core basis for classification is: 1) Material is carbon steel (not stainless steel, not alloy steel); 2) Manufacturing process is welding (not casting, not forging); 3) It is a pipe fitting (used to connect pipelines). Reference should also be made to the Import and Export Tariff and its notes to ensure compliance with the description of 7307.93.
Confused Codes：
730791 - Other carbon steel flanges
730791 covers carbon steel flanges, regardless of process, but flanges are disc-shaped parts used to connect pipe ends or equipment, whereas 730793 covers welded fittings such as elbows, tees, etc.
730792 - Other carbon steel threaded fittings
730792 covers carbon steel threaded fittings, connected by threads, whereas 730793 covers welded fittings, connected by welding.
730799 - Other carbon steel pipe fittings
730799 covers other carbon steel pipe fittings not elsewhere specified, such as socket-welding fittings, ferrule fittings, etc., whereas 730793 specifically refers to welded fittings (butt-welding).
730711 - Cast malleable cast iron pipe fittings
730711 covers cast malleable cast iron, with different material and process; carbon steel welded fittings are classified under 730793.
730721 - Stainless steel flanges
730721 covers stainless steel flanges, with stainless steel as the material, whereas 730793 covers carbon steel welded fittings.
Self-Check：
✓ Is the material carbon steel?
✓ Is the process welding?
✓ Is it a pipe fitting?
✓ Is it used to connect pipelines?
✓ Are flanges and threaded fittings excluded?
❓ FAQ
What is the difference in HS codes between carbon steel welded fittings and carbon steel threaded fittings? Carbon steel welded fittings are classified under 730793, while carbon steel threaded fittings are classified under 730792. The main difference lies in the connection method: welded fittings are connected to pipes by welding, while threaded fittings are connected by threads. The process must be clearly stated during declaration. How to determine whether a carbon steel pipe fitting is a welded fitting or a forged fitting? Welded fittings are typically formed by welding steel plates or strips, or machined from seamless pipes, but the classification emphasizes the "welding" process; forged fittings are manufactured by forging. Product standards, appearance, and manufacturing process can be used to distinguish them. When declaring a carbon steel welded elbow, how should the specifications and dimensions be filled in? The nominal diameter (e.g., DN100), wall thickness grade (e.g., Sch40), angle (e.g., 90°), etc. should be filled in. If there is a standard number (e.g., ASME B16.9), it should also be provided so that customs can confirm the classification. If a carbon steel welded fitting is used for a stainless steel pipeline, does the HS code change? The HS code depends on the material of the fitting itself, not the use. If the fitting is made of carbon steel, even if used for a stainless steel pipeline, it is still classified under 730793. However, note that if the fitting is made of stainless steel, it is classified under 730722, etc. Are both carbon steel welded tees and carbon steel welded reducers classified under 730793? Yes, as long as the material is carbon steel, the process is welding, and it is a pipe fitting, they are all classified under 730793. This subheading covers butt-welding elbows, tees, reducers, caps, etc. When declaring, how to distinguish between "welding" and "butt-welding"? Butt-welding is a type of welding, referring to welding two end faces together. In HS classification, butt-welding fittings belong to welded fittings and are classified under 730793. When declaring, "butt-welding" can be noted to clarify the process. What declaration elements are required for carbon steel welded fittings? Generally, product name, material, process, type, specifications and dimensions, standard, use, etc. are required. Specific requirements are subject to customs; it is recommended to refer to the "Catalogue of Specifications for Declaration of Import and Export Commodities of the People's Republic of China." If a carbon steel welded fitting is machined, does it affect the classification? No. 7307 includes pipe fittings that have been machined but not assembled into other products. As long as no valves or other devices are installed, they are still classified under 7307. However, if after machining they become machine parts, they may be classified under other chapters.
Q: What is the difference in HS codes between carbon steel welded fittings and carbon steel threaded fittings?
A: Carbon steel welded fittings are classified under 730793, while carbon steel threaded fittings are classified under 730792. The main difference lies in the connection method: welded fittings are connected to pipes by welding, while threaded fittings are connected by threads. The process must be clearly stated during declaration.
Q: How to determine whether a carbon steel pipe fitting is a welded fitting or a forged fitting?
A: Welded fittings are typically formed by welding steel plates or strips, or machined from seamless pipes, but the classification emphasizes the "welding" process; forged fittings are manufactured by forging. Product standards, appearance, and manufacturing process can be used to distinguish them.
Q: When declaring a carbon steel welded elbow, how should the specifications and dimensions be filled in?
A: The nominal diameter (e.g., DN100), wall thickness grade (e.g., Sch40), angle (e.g., 90°), etc. should be filled in. If there is a standard number (e.g., ASME B16.9), it should also be provided so that customs can confirm the classification.
Q: If a carbon steel welded fitting is used for a stainless steel pipeline, does the HS code change?
A: The HS code depends on the material of the fitting itself, not the use. If the fitting is made of carbon steel, even if used for a stainless steel pipeline, it is still classified under 730793. However, note that if the fitting is made of stainless steel, it is classified under 730722, etc.
Q: Are both carbon steel welded tees and carbon steel welded reducers classified under 730793?
A: Yes, as long as the material is carbon steel, the process is welding, and it is a pipe fitting, they are all classified under 730793. This subheading covers butt-welding elbows, tees, reducers, caps, etc.
Q: When declaring, how to distinguish between "welding" and "butt-welding"?
A: Butt-welding is a type of welding, referring to welding two end faces together. In HS classification, butt-welding fittings belong to welded fittings and are classified under 730793. When declaring, "butt-welding" can be noted to clarify the process.
Q: What declaration elements are required for carbon steel welded fittings?
A: Generally, product name, material, process, type, specifications and dimensions, standard, use, etc. are required. Specific requirements are subject to customs; it is recommended to refer to the "Catalogue of Specifications for Declaration of Import and Export Commodities of the People's Republic of China."
Q: If a carbon steel welded fitting is machined, does it affect the classification?
A: No. 7307 includes pipe fittings that have been machined but not assembled into other products. As long as no valves or other devices are installed, they are still classified under 7307. However, if after machining they become machine parts, they may be classified under other chapters.
⚠️ 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.