This standard system is based on China's current standards for the chemical composition of copper and copper alloy smelting and processing products, including GB/T468-1997 "Copper Wire Rods for Electrical Purposes", GB/T3952-1998 "Copper Wire Billets for Electrical Purposes", GB/T467-1997 "High-Purity Cathode Copper", and "Standard Cathode Copper"
