Abstract: The bearing steel was smelted using 100 t EAF in the domestic steel factory, and it is difficult to control of the total oxygen mass fraction less than 10×10^-6. After a system of the research, the improvement measures were proposed as followed: the end-point carbon mass fraction was above 0.1 %; the addition of Al-deoxidizer and the slagging were advanced to the LF refining; the slag basicity was controlled in 5-8, and w(CaO)/w(Al₂O₃) of the slag was controlled in 1.5-1.7, and w(MgO) was controlled in 5 %-8 %; the electromagnetic stirring intensity was reduced in order to prevent mold slag entrapment. The industrial test showed that the total oxygen mass fraction of the bearing steel could be controlled below 10×10^-6 by using the improvement measures.

Key words: EAF, bearing steel, the total oxygen, key technologies, industrial test