<p>In the top-blown converter steelmaking process, the dynamic behavior of the supersonic oxygen jet exerts a decisive influence on molten bath stirring efficiency. Furthermore, this influence is directly related to the converter low-carbon smelting operations. To support low-carbon steelmaking, this study proposes a novel oxygen lance (one central nozzle + four peripheral nozzles). The influences of key nozzle structural parameters (inclination angle and flow rate ratio) on the jet characteristics are systematically investigated, and the results demonstrate that, compared with the traditional oxygen lance, the central nozzle oxygen lance has a large effective impact area. Furthermore, increasing the inclination angle decreases the velocity of the peripheral nozzle, while the heat transfer efficiency is improved. Concurrently, jet coalescence and jet offset are reduced, the effective impact area is increased by 7.1% to 7.6%. Increasing the central nozzle flow rate significantly improves the peak velocity of the central nozzle jet and the turbulent kinetic energy in the central region. However, it increases the jet coalescence and decreases the effective impact area. These findings provide important theoretical guidance for energy saving and emission reduction in converter steelmaking process.</p>