Continuous Refinement
Solid semi-finished metallurgical feedstocks manufactured by continuous casting and rolling process copper cathode into continuous eight-millimeter cylindrical shapes. Continuous casting mills process high-purity cathode to produce copper wire rods that serve downstream magnet wire and cable drawing operations. Standard industrial specifications bound oxygen content between one hundred and four hundred parts per million to ensure optimal electrical conductivity alongside ductility during fine gauge processing.
Inclusions of hydrogen or iron degrade structural integrity during secondary drawing operations. The physical form stops applying as a raw feedstock once drawing dies reduce the cross-sectional diameter below finished cable thresholds.
Drawing Capability
Processing speed during wire drawing determines the mechanical stress exerted on the rod structure. High-speed drawing plants run copper wire rods through progressive carbide dies at speeds exceeding twenty meters per second without annealing interruptions. Microstructural impurities or surface oxide scale cause tensile breaks during high-speed reduction.
Mill quality controls measure elongation percentages and electrical resistivity prior to shipment.
Pricing Mechanism
Terminal metal exchanges quote underlying metal value on daily spot cash rates. Buyers of copper wire rods pay a physical fabrication premium above the London Metal Exchange cash price to cover conversion costs and freight delivery. Contractual formulas tie monthly settlements directly to official exchange averages.