Abstract: It was studied the quality of carbide, non-metallic inclusions and composition change of sulfur bearing M35 high speed steel (0. 015% ~ 0.030 S) using acid slag remelting in atmospheric conditions using the 1 t double electrode furnace. When the acid slag was remelting,the sulfur,silicon,manganese,chromium have a large difference between the two ends of the ingot, the difference reduced using the method of adding calcium sulfide when slag melting and adding manganese iron when Slag dump. The quality level of carbide nonuniformity granularity of sulfur bearing M35 high speed steel mill bar is similar to that of conventional alkaline slag,non-metallic inclusions class A is less than 1.5 ,B, C and D, which are less than or equal to 1.0.

Key words: Sulfur Bearing high Speed Steel M35, Electroslag Remelting, Acid Slag, Chemical Composition, Carbide, Non-metallic Inclusions.