Chapter 73 covers 'articles of iron or steel', including tubes, hollow profiles, welded profiles, railway track material, chains, anchors, nails, bolts, nuts, screws, washers, springs, stoves, tableware, sanitary ware, etc. This chapter does not include raw materials for iron and steel smelting (Chapter 72) and machinery and equipment (Chapter 84). The core is general-purpose articles made from iron or steel through further processing (casting, forging, stamping, welding, etc.). Heading 7325 covers 'other cast articles of iron or steel', i.e., articles of iron or steel formed by casting that are not named in other headings. This includes castings of malleable cast iron, ductile iron, gray iron, etc., such as pipe fittings, valve housings, gear blanks, rough machine parts, etc. However, it does not include castings exclusively for a particular machine (which should be classified under Chapter 84) or tools clearly belonging to Chapter 82. Code 732510 has 6 digits: the first 2 digits '73' represent Chapter 73 (articles of iron or steel); digits 3-4 '25' represent heading 7325 (other cast articles of iron or steel); digits 5-6 '10' represent subheading 732510, specifically 'cast articles of cast iron', i.e., cast articles limited to cast iron material (pig iron with carbon content 2%-4%). This subheading is not further subdivided; all cast iron castings other than malleable cast iron are classified under this code. The goods are made of cast iron (not steel), formed by casting, and not specifically named in other headings, so they are classified under 732510. If they were steel castings, they should be classified under other subheadings of 7325 (such as 732599); if they were malleable iron castings, they would also be classified under 732510 (malleable cast iron belongs to cast iron); if they were iron or steel powder metallurgy products, they would be classified under 7326.

Product name: The standard name of the declared commodity should include material and process, such as 'cast iron casting', 'gray iron valve body', etc. Material: Specific type of cast iron, such as gray iron, ductile iron, malleable iron, alloy cast iron, etc., and the grade should be indicated (e.g., HT200). Use: Describe the final use scenario of the casting, such as 'used for automobile engine cylinder blocks', 'used for pipe connections', etc. Processing method: Explain the forming process, such as 'machined after casting', 'polished after casting', etc. Composition content: Percentage of main chemical components, such as carbon, silicon, manganese, phosphorus, sulfur, etc., used to confirm cast iron properties. Appearance and dimensions: Physical characteristics of the casting such as shape, size, weight, etc., to facilitate customs inspection. Brand and model: If there is a brand and model, they must be declared; if there is no brand, indicate 'no brand'. Customs declaration example: Product name: Cast iron casting (gray iron) Material: Gray iron HT250, carbon 3.2%, silicon 1.8%, manganese 0.8% Use: Used to manufacture machine tool beds Processing method: Rough machining after casting Appearance and dimensions: Length 500mm × Width 300mm × Height 200mm, weight 25kg Brand: No brand Model: None HS code: 7325100090 Mistakenly declaring cast iron parts as steel castings, resulting in incorrect code (should be classified under other subheadings of 7325). Not indicating the specific cast iron type and grade, which may raise questions about classification accuracy. Unclear use description; if exclusively for a particular machine (such as an internal combustion engine), it should be classified under Chapter 84, not 7325.

Core basis for classification: 1) The material must be cast iron (pig iron with carbon content 2%-4%), not steel or alloy steel; 2) It must be formed by casting, not forging, stamping, etc.; 3) It is not more specifically named in other headings. If a casting is exclusively for a certain machine (such as a pump or engine), even if the material is cast iron, it should be classified under the corresponding heading of Chapter 84. 732599 Other cast articles of iron or steel: 732599 covers steel castings and other cast articles not elsewhere named, while 732510 is limited to cast iron castings. The difference lies in the material: cast iron has high carbon content, steel castings have low carbon content. 732690 Other articles of iron or steel: 732690 covers articles of iron or steel not elsewhere named, including forgings, stampings, etc., but not castings. If cast iron parts undergo further processing (such as welding or assembly), they may be classified under this code. 848190 Valve parts: If cast iron castings are exclusively for valves, they should be classified under 848190, not 732510. The difference lies in whether they are exclusively for valves. 841290 Engine parts: Cast iron parts exclusively for engines (such as cylinder blocks and cylinder heads) should be classified under 841290, not 732510. 732510 Malleable iron castings: Malleable cast iron belongs to cast iron and is still classified under 732510, but care must be taken to distinguish it from steel castings. Is the material cast iron (carbon content 2%-4%)? Is it formed by casting? Is it exclusively for a certain machine (such as a valve or engine)? Has it undergone further processing (such as welding or assembly)? Is it combined with other materials?

How can one determine whether a cast iron part is classified under 732510 or Chapter 84? The key is the use: if the cast iron part is a general-purpose part and not exclusively for a certain machine, it is classified under 732510; if it is exclusively for a certain machine (such as an internal combustion engine, pump, or valve), it is classified under the corresponding heading of Chapter 84. For example, cast iron valve bodies should be classified under 848190, while general cast iron pipe fittings are classified under 732510. Is there any difference in HS codes between gray iron and ductile iron? There is no difference. Gray iron, ductile iron, malleable iron, etc. all belong to cast iron and are all classified under 732510. However, the specific type must be indicated at declaration so that customs can confirm the material. Will the code change after cast iron castings undergo machining? If only simple grinding, deburring, etc. are carried out, classification is not affected and they remain under 732510. If further processing is carried out (such as welding or assembly into components), they may be classified under 732690 or other headings. How can one check the import tariff rate for 732510? Tariff rates change. It is recommended to obtain the latest tariff rate through the General Administration of Customs website, China International Trade Single Window, or professional tariff query tools by entering HS code 732510 and conditions such as country of origin and trade mode. When declaring cast iron castings, is a material test report required? Usually not required, but customs may require material certification or test reports to confirm classification. It is recommended to keep the material certificate provided by the manufacturer for inspection. How can cast iron castings and steel castings be distinguished at declaration? Cast iron has a carbon content greater than 2%, and steel castings have a carbon content less than 2%. At declaration, the carbon content should be indicated, and 'cast iron' and 'cast steel' should be distinguished. Steel castings are classified under 732599, and cast iron castings under 732510. If cast iron parts are imported as complete sets of unassembled parts, how are they classified? If the unassembled parts constitute a complete machine, they should be classified under the heading for the complete machine; if the unassembled parts are general-purpose parts, they remain under 732510. Judgment should be made according to the actual state presented for inspection. For cross-border e-commerce exports of cast iron castings, how should the HS code be filled in? Cross-border e-commerce exports also require declaration of the HS code. Cast iron castings should be filled in as 732510, and the declaration elements such as material and use should be filled in in detail. Note that codes may differ by country and must be adjusted according to the requirements of the destination country.