The invention discloses a method for increasing the number of continuous drawing furnaces of
sulfur-containing gear steel. The method comprises the working procedures of converter
smelting, LF refining, RH refining and
continuous casting. The method comprises the following steps of (1) at a converter
smelting end point, C is not less than 0.06%, P is not more than 0.015%, and the tapping temperature is 1640 + / -10 degrees Celsius, during tapping, aluminum blocks and synthetic
slag are added into
molten steel, and the
oxygen content in the steel is smaller than or equal to 50 ppm; (2) LF refining target
slag comprises the following components of less than or equal to 0.6% of TFe, 54%-56% of CaO, 13%-15% of SiO2, 21%-23% of Al2O3 and 6%-8% of MgO, after
slag is formed, white slag is kept by adopting a method of supplementing
lime and
silicon carbide, and adding a
calcium line before outbound; (3) RH refining, after vacuum treatment is completed, adding a
sulfur line, after soft
argon blowing is carried out for more than or equal to 15 minutes, and discharging the
molten steel; and (4)
continuous casting, adopting a submersed
nozzle. According to the method provided, the average
continuous casting furnace number reaches 15, and the low-power grade of the produced gear steel reaches 2.0 grade.