Chapter 76 covers aluminum and articles thereof, including unwrought aluminum, aluminum bars, rods, profiles, wire, plates, sheets, strip, foil, aluminum tubes, aluminum structures, aluminum containers, stranded wire, cables, etc. This chapter does not include aluminum waste and scrap (heading 76.02), aluminum machine parts (Chapter 84), aluminum vehicles (Chapter 87), etc. The core is primary forms and general articles of aluminum and aluminum alloys. Heading 7604 covers aluminum bars, rods, profiles and shapes, including hollow profiles and solid profiles. Specifically includes: aluminum alloy bars and rods (7604.10), aluminum alloy profiles (7604.21 hollow, 7604.29 other), other aluminum bars and rods (7604.30), other aluminum profiles (7604.40 hollow, 7604.50 other). Note: hollow profiles refer to profiles with a cavity in cross-section, regardless of the number of cavities. First 2 digits 76: Chapter 76, aluminum and articles thereof. Digits 3-4 04: heading 7604, aluminum bars, rods, profiles and shapes. Digits 5-6 21: subheading 7604.21, hollow profiles of aluminum alloy. Specifically: 7604.21 applies only to aluminum alloy material, and the profile cross-section is hollow (such as tubular, rectangular hollow, multi-cavity hollow, etc.). If it is a hollow profile of pure aluminum, it is classified under 7604.40; if it is a solid profile of aluminum alloy, it is classified under 7604.29. This commodity is a hollow profile of aluminum alloy, satisfying three conditions at the same time: material is aluminum alloy (not pure aluminum), shape is profile (not bar or rod), cross-section has a cavity (hollow). Therefore it is classified under 7604.21. Among adjacent codes, 7604.10 is aluminum alloy bars and rods (solid), 7604.29 is other aluminum alloy profiles (solid), 7604.40 is pure aluminum hollow profiles, 7604.50 is other pure aluminum profiles.

Product Name: The specific name of the declared commodity, which should include key information such as material, shape, and use, e.g., "aluminum alloy hollow profile". Material: Specify the specific grade or composition of the aluminum alloy, such as 6061, 6063, etc., and indicate whether it is an aluminum alloy. Shape: Describe the cross-sectional shape of the profile, such as rectangular hollow, circular hollow, multi-cavity hollow, etc., and indicate hollow. Specifications and Dimensions: Declare the length, outer diameter, wall thickness, cross-sectional dimensions, etc., of the profile, e.g., "outer diameter 50mm, wall thickness 2mm, length 6m". Use: Explain the main use of the profile, such as building doors and windows, industrial frames, heat sinks, etc. Processing State: Indicate whether it has undergone further processing (such as drilling, bending, coating, etc.). If not processed, write "not further worked". Brand: If there is a brand, declare the brand name; if no brand, write "no brand". Model: Declare the specific model or item number for easy identification. Customs declaration example: Product Name: Aluminum alloy hollow profile Material: Aluminum alloy 6063 Shape: Rectangular hollow Specifications and Dimensions: Outer diameter 40mm×40mm, wall thickness 1.5mm, length 6m Use: Building door and window frames Processing State: Not further worked Brand: No brand Model: 6063-T5 HS Code: 7604210000 Mistakenly declaring hollow profiles as aluminum tubes (7608); aluminum tubes are tubular but usually refer to round tubes, and hollow profiles may have special-shaped cross-sections. Failure to provide the aluminum alloy grade, making it impossible to determine whether it is an aluminum alloy, possibly resulting in classification as pure aluminum profiles. Declaring profiles that have undergone further processing such as welding or riveting as profiles; in fact, they may be classified under other headings.

Core basis for classification: 1) The material must be aluminum alloy, according to Chapter 76 notes and subheading notes of the Tariff; 2) The shape is a profile, i.e., uniform cross-section along the entire length and meeting the definition of profile; 3) The cross-section is hollow, i.e., there is an internal cavity. All three are indispensable. If it is a pure aluminum hollow profile, classify under 7604.40; if it is an aluminum alloy solid profile, classify under 7604.29; if it is an aluminum alloy bar or rod, classify under 7604.10. 760410 Aluminum alloy bars and rods: Bars and rods are solid, with cross-sections usually circular, square, etc., and the length dimension is much larger than the cross-section, while hollow profiles have a cavity. 760429 Other aluminum alloy profiles: This code is for aluminum alloy solid profiles without cavities, while hollow profiles have cavities, which is the core difference. 760440 Pure aluminum hollow profiles: The material is pure aluminum rather than aluminum alloy; if it is aluminum alloy, classify under 7604.21. 760820 Aluminum alloy tubes: Tubes usually refer to circular cross-sections used for conveying fluids, while hollow profiles have diverse cross-sections and are not limited to round tubes. Is the material aluminum alloy? Is the cross-section hollow? Is it a profile (uniform cross-section along the entire length)? Is it not further worked? Is it confused with adjacent codes?

How to distinguish between aluminum alloy hollow profiles and aluminum alloy tubes? The cross-section of hollow profiles can be rectangular, square, multi-cavity, or other special shapes, and they are usually used for structural parts; while aluminum tubes generally refer to circular cross-sections used for fluid conveyance. However, in HS codes, 7604.21 includes all aluminum alloy hollow profiles, regardless of cross-sectional shape, while 7608.20 is aluminum alloy tubes. If the cross-section is circular and meets the definition of a tube, it may be classified under 7608, but if it is a special-shaped hollow, it is classified under 7604.21. It is recommended to judge based on cross-sectional shape and use. What is the impact of not providing the aluminum alloy grade during declaration? Failure to provide the grade may prevent customs from confirming whether it is an aluminum alloy, possibly resulting in classification as pure aluminum profiles (7604.40) or a request for supplementary materials. It is recommended to provide specific grades such as 6061, 6063, etc., and indicate compliance with aluminum alloy standards. Is a hollow profile still classified under 7604.21 after drilling? If drilling or other processing does not affect the basic characteristics of the profile, it may still be classified under 7604.21. However, if processing makes it a machine part or specialized part, it may be classified under other headings. According to the General Rules for Classification, if processing exceeds simple treatment, it may change the classification. It is recommended to consult customs or obtain advance classification. How to query the tariff rate for 760421? The tariff rate depends on the country of origin, trade agreements, etc. You can query the Chinese Customs "Import and Export Tariff" or through the General Administration of Customs website or the Single Window. Note that rates may change; it is recommended to use the latest version. What are the differences in declaration elements between hollow profiles and solid profiles? Hollow profiles require emphasis on "hollow" and cross-sectional shape, while solid profiles require "solid". Other elements such as material, specifications, and use are similar. Specifications for hollow profiles need to include inner diameter or cavity dimensions. If the profile is aluminum alloy but has a circular hollow cross-section, is it classified under 7604.21 or 7608.20? According to HS notes, 7604 includes hollow profiles, even if the cross-section is circular, as long as it meets the definition of a profile (uniform cross-section along the entire length) and is used for structural purposes, it is usually classified under 7604.21. Tubes under 7608 usually refer to pipes used for fluid conveyance and may have undergone further processing. It is recommended to judge based on use and cross-sectional characteristics. What should be noted when declaring aluminum alloy hollow profiles for cross-border e-commerce sales? It is necessary to accurately declare the product name, material, shape, specifications, use, etc., to avoid rejection or penalties due to inaccurate declaration. It is recommended to keep product technical data and apply for advance classification if necessary. Also pay attention to export tax rebate and import tariff policies. Are the tariff rates for 760421 and 760429 the same? The rates may differ, depending on national policies and trade agreements. You need to query the latest tariff. Usually the rates for hollow profiles and solid profiles may be the same, but it is recommended to rely on actual queries.