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Preface This standard is a revision of GB467-82 \"Electrolytic Copper\" based on ASTMB115-93 \"Cathode Copper\". This standard renames electrolytic copper (Cu-1) from the original GB 467-82 as standard cathode copper (Cu-CATH-2), which is equivalent to cathode copper No. 2 in ASTMB115. Based on the actual conditions in China, the specifications for the maximum allowable levels of impurities in standard cathode copper set out in this standard differ from those for Grade 2 cathode copper in ASTMB115: standard cathode copper has a higher bismuth content and a lower lead content ； Requirements are set for zinc and sulfur, but not for selenium and tellurium. ASTMB115 is the opposite: it sets requirements for selenium and tellurium, but not for zinc and sulfur. In addition, the high-purity cathode copper (Cu-CATH-1) specified in GB/T 13585-92 \"High-Purity Cathode Copper\" has also been included in this standard. GB/T 13585-92 was formulated by equating it with high-purity cathode copper specified in BS 6017-1989 \"Refined copper\"; no modifications were made to the technical contents when they were incorporated into this standard. The scope of this standard differs from that of the original standard, and the standard name has been changed to \"Cathode Copper\". As of the date of implementation, this standard replaces the original GB 467-82 and GB/T 13585-92; at the same time, the GB 466-82 standard is repealed. This standard was proposed by the China Non-ferrous Metals Industry Corporation. This standard is under the responsibility of the Standard and Metrology Research Institute of the China Non-ferrous Metals Industry Corporation. This standard was drafted by Shanghai Smelting Plant and the Standard and Metrology Research Institute of China Non-ferrous Metals Industry Corporation. This standard was drafted by Shanghai Smelting Plant and the Standard Planning Institute of China Non-ferrous Metals Industry Corporation. Main drafters of this standard: Zeng Yunhua, Fan Shunké, Lu Ruqiong, Yao Chuan. 1 Scope This standard specifies the requirements, test methods, inspection rules, marking, packaging, and quality certificates for cathode copper. This standard applies to electrolytic refining or electrolytic copper used to produce cathode copper, which is generally intended for remelting. 2 Referenced Standards The provisions contained in the following standards may, based on their role within those standards, constitute the provisions of this standard; the versions indicated are all valid at the time of publication of this standard. All standards will be revised, and those using this standard should consider the possibility of adopting the latest versions of the following standards. GB/T 5121.1-5121.23-1997 Chemical analysis of copper and copper alloys GB 8170-3 Rules for rounding of numerical values GB/T 132.23-91 Methods for chemical analysis of high-purity cathode copper 3 Contents of order form (or contract) The order form (or contract) for the materials specified in this standard shall include the following contents: 3.1 Product name 3.2 Grade 3.3 Quantity 3.4 Standard number, year code 3.5 Special requirements regarding impurity content 3.6 Dimension requirements 3.7 Packaging requirements 3.8 Other Element group Impurity element Maximum allowable content Total content of element group, maximum 1 Se 0.00020 0.00300 0.0005 Fe 0.00020 Bi 0.00020 2 Cr – 0.0015 Mn – Sb 0.0004 Cd – As 0.0005 P – 3 Pb 0.0005 0.0005 4 S 0.00150 0.0015 5 Sn – 0.0020 Ni – Fe 0.0010 Si – Zn – Co – 6 Ag 0.0025 0.0025 Total content of impurity elements 0.0065 1) To be determined on cast samples 4 Requirements 4.1 Product classification Cathode copper is classified into two grades based on chemical composition: high-purity cathode copper (Cu-CATH-1) and standard cathode copper (Cu-CATH-2). 4.2 Chemical Composition 4.2.1 The chemical composition of high-purity cathode copper shall meet the requirements specified in Table 1. The chemical composition of standard cathode copper shall comply with the provisions in Table 2. Table 1 Chemical composition of high-purity cathode copper (Cu-CATH-1) % Table 2 Chemical composition of standard cathode copper (Cu-CATH-2) % Cu+Ag: not less than; Impurity contents: not more than As Sb Bi Fe Pb Sn Ni Zn S P 99.95 0.0015 0.0015 0.0006 0.0025 0.002 0.001 0.002 0.002 0.0025 0.001 Note: The supplier shall determine the contents of copper, arsenic, antimony, and bismuth in the standard cathode copper on a batch basis, and ensure that the levels of other impurities comply with the provisions of this standard. 4.2.2 If the buyer has special requirements regarding the oxygen content in the product, it shall be determined through consultation between the supplier and the buyer. 4.3 Surface Quality 4.3.1 The surface of cathode copper should be clean, free from any foreign substances such as sludge or oil. 4.3.2 The surface of high-purity cathode copper shall be free of copper sulfate; the total area of green deposits on the surface of standard cathode copper (including the lugs) shall not exceed 3% of the surface area on one side. However, a layer of dark green color that forms on the surface of cathode copper due to oxidation caused by humid air is not considered defective. 4.3.3 The surface and edges of the cathode copper must not have petal-shaped or branch-shaped granules (trimming is allowed). 4.3.4 On the surface of standard cathode copper, the total area of dense rounded granules with a height of more than 5 mm shall not exceed 10% of the area on one side (trimming is permitted). 4.4 Other requirements 4.4.1 Cathode copper shall be supplied in whole blocks. Upon negotiation between the supplier and the buyer, cut pieces can also be supplied. 4.4.2 Cathode copper blocks shall withstand normal handling without brittle fracture. 4.4.3 The weight of a single cathode copper piece shall be not less than 15 kg, or the thickness at its center shall be not less than 5 mm. 5 Test Methods 5.1 The arbitration analysis method for the chemical composition of high-purity cathode copper is carried out in accordance with the provisions of GB/T 13293. 5.2 The arbitration analysis method for the chemical composition of standard cathode copper is carried out in accordance with the provisions of GB/T 5121. 5.3 Surface quality is inspected by visual inspection. 6 Inspection Rules 6.1 Inspection and Acceptance 6.1.1 The products shall be inspected by the supplier’s technical supervision department to ensure that their quality meets the requirements of these standards, and a quality certificate shall be issued. 6.1.2 The buyer may inspect the quality of the received products. If the inspection results do not conform to the provisions of these standards, the buyer may raise the issue with the supplier within one month from the date of receipt of the products, and the matter shall be resolved through consultation between the buyer and the supplier. In the event of arbitration, the sampling for arbitration shall be carried out jointly by both the supplier and the buyer at the buyer’s location. The results of the arbitration analysis are the final results. 6.2 Batching Products shall be submitted for inspection in batches, with each batch consisting of cathode copper produced on the same day, using the same circulation system, and at the same current density. The batch weight shall not exceed 200 t. 6.3 Arbitration sampling methods 6.3.1 Arbitration sampling methods for high-purity cathode copper 6.3.1.1 Select 24 samples from each batch of high-purity cathode copper and number them sequentially. 6.3.1.2 Each numbered piece of high-purity cathode copper is vertically divided into 24 rectangular strips equally; they are also numbered sequentially from left to right, and then the rectangular strip corresponding to the number of each piece is selected. That is, the first piece is used to cut out the first rectangular strip, the second piece is used to cut out the second rectangular strip, the third piece is used to cut out the third rectangular strip, and so on. 6.3.1.3 At room temperature, the 24 taken long main strips are cut into appropriate small pieces, immersed in a 10% hydrochloric acid solution for 15 minutes, then thoroughly washed with deionized water to remove all foreign contaminants, and dried (to avoid oxidation). 6.3.1.4 Some high-purity cathode copper was taken from this batch and placed in a covered graphite crucible for melting, after which the melt was poured out. 6.3.1.5 Depending on the capacity of the graphite crucible (6.3.1.4), the cleaned small test pieces (6.3.1.3) are melted using one of the following two methods. a) The cleaned specimens are placed in graphite crucibles and heated to melt in an induction furnace or resistance furnace under an inert gas atmosphere. A graphite rod is used to stir the melt thoroughly, after which it is poured into graphite molds in a sequential front-back-middle order to produce three ingots of appropriate size. b) When the capacity of the graphite crucible is not large enough, the cleaned samples can be divided into two or more groups, and then the procedure in method a) can be followed. 6.3.1.6 During the pouring process, oxygen intrusion should be avoided. 6.3.1.7 After removing the surface layer of the sample ingot, use carbide tools to drill, mill, or saw cut the sample (preventing overheating to avoid oxidation is necessary). Fine particles weighing more than 600 g were obtained, and these particles were carefully mixed together. Iron particles that might have been introduced during processing were removed using magnets. The iron-free sample was then divided into four portions, each weighing no less than 150 g: one portion for analysis by the supplier, one for joint analysis by both parties, one for arbitration analysis, and one kept as a reserve. 6.3.2 Arbitration sampling method for standard cathode copper 6.3.2.1 Randomly select 6–10 sample pieces from this cathode copper. 6.3.2.2 Use drills with a diameter of 10 mm–20 mm to drill several holes in a rectangular area 100 mm away from the edges of the cathode copper, arranged in a grid pattern. No lubricant shall be used during drilling, and the drilling speed should be such that the sample does not oxidize. 6.3.2.3 Surface drill debris should be removed, and the drilling depth should be more than half of the sample block’s thickness. The resulting drill cuttings are carefully mixed together; any iron particles brought in during processing are removed using a magnet. The mixture is then reduced to a weight of at least 600 grams, and divided evenly into four portions: one portion for analysis by the supplier, one for joint analysis by both the supplier and the buyer, one for analysis in the event of arbitration, and one as a spare portion. 6.4 Judgment of test results 6.4.1 If the results of the arbitration analysis of chemical composition do not conform to the provisions of this standard, such batch is considered defective. 6.4.2 If the surface inspection results do not meet the requirements of Standard 4.4, the unit is deemed to be a non-conforming product. 6.4.3 When the physical requirements do not meet clauses 4.5.2 and 4.5.3, the unit is judged as a non-conforming product. 7 Marking, Packaging and Quality Certificates 7.1 Cathode copper shall be packaged into bales suitable for handling its weight. By agreement between the supplier and the buyer, packaging may also be omitted. 7.2 Each bundle of cathode copper must have clear markings indicating: a) the manufacturer’s mark ； b) Product grade ； c) Batch number. 7.3 Each batch of cathode copper shall be accompanied by a quality certificate stating: a) the name of the manufacturer ； b) Product name and grade ； c) Batch number ； d) Batch weight ； e) Analysis of test results and markings from technical supervision departments ； f) Standard number ； g) Date of manufacture. This post was last edited by Desert Poplar on 2009-3-30 16:15]