Abstract: The safe reform of equipment and workshop building for the steelmaking in Long Product Department of Tangshan Iron and Steel Company of Hebei Iron and Steel Group was put into effect in 2013. According to the project scheduling and considering the production plan of branch steel, the 50 t ladle furnace was removed and a 65 t ladle furnace was constructed. The device parameter, process stipulation, the arc heat, slag-making, argon blow and wire injection of 65 t LF were briefly introduced in the paper. The welding wire steel productive practice showed that the refining periodic time was 50—60 min, the power consumption was 60 kWh/t, the heat speed was 5 ℃/min, sulphur percent was 0.010 %~0.020 %, nitrogen percent was less than or equal to 30×10-6, and the liquid steel quality and purity reached users demand.

Key words: LF, refining process, welding-wire steel, production