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See Chinese contents: GB/T 4423-2020 GB/T 4423-2020: Copper and copper alloy cold-drawn rod and bar
This Standard specifies classification and marking, technical requirements, test methods, inspection rules, marks, packaging, transportation, storage and quality certificate, purchase order (or contract) content for copper and copper alloy cold-drawn rod and bar. This Standard is applicable to general purpose round, rectangular, square and regular hexagonal copper and copper alloy cold-drawn rod and bar.
