Abstract: Through chemical composition and refining slag metallurgical effect optimization, the low carbon composite fast cutting steel was successfully developed by the “60 t Consteel EAF→LF→VD→CC” process in Shougang Guiyang Special Steel Co.,Ltd.  Results show that the steel chemical composition was stable, the inclusions distributed were uniform and cutting performance was good. The cutting property  of low carbon composite fast cutting steel material by the optimized process was much better than that before, the surface roughness had  reached  the level of  0.8 μm.

Key words: low carbon fast cutting steel, metallurgical effect, inclusion;cutting , property