Abstract：The sulphur, titanium and oxygen contents in superclean bearing steel (SFGCr15) are less than 0.003%, 0.0012% and 0.0007% respectively and the content of nonmetallic inclusions is at satisfactory level by controlling the technological parameters of EAF steelmaking(intensity of oxygen supply, content of (FeO) in slag, the rate of slag stopping at tapping, oxygen activity of liquid steel at tapping), LF refining(refining slag composition, deoxidizers, temperature of liquid steel, refining time, pressure of bottom argon blowing, the selection of refractory materials in refining ladle, the selection of ferroalloys), vacuum degassing (vacuum degree, time of vacuum degassing, pressure of bottom argon blowing) and soft argon stirring after vacuum degassing, adapting IAPS and adjusting the casting rate of liquid steel. In this way, the quality of SFG15 meets the requirements from top world bearing manufacturers.
2006, Vol. 41 