Abstract:In this paper, a series of issues with the SCR7000 continuous casting and rolling copper rod production line that was introduced aiming to facilitate the technical breakthrough for the research and development of a new line of precision fine wires (with diamment, vertical furnace feeding system, and feeding time), purifying the copper liquid, optimizing oxygen content, improving ingot formeters below Φ0.05 mm). The improvements focused on enhancing the homogenization of copper raw materials (including surface treating quality (by controlling cooling intensity and casting temperature), and refining the rolling process. Analytical methods such as metallographic microscopes and SEM were used to compare the quality of products after these technical upgrades. By building on prior experiences, they achieved copper liquid homogenization and stabilization through surface treatment of cathode copper plates, improved feeding system, and optimized vertical furnace combustion processes. Further purification of the copper liquid was accomplished with multiple slagging, increased slagging frequency, improved sealing between upstream and slagging channels, modification of downstream channels and ladle structures, and the incorporation of filtering bricks. To ensure favorable copper rod properties, the oxygen content was tightly controlled to a range of (200~300)×10-6, thus minimizing the adverse effects caused by Cu2O eutectic dispersion. The entry rolling temperature was also precisely managed within the range of 830 to 840 ℃. As a result of these advancements, the company successfully developed a new copper rod product capable of stable production of Φ0.05 mm precision fine copper wire, which received widespread recognition and approval from users.