Silicon manganese ball is a comprehensive alloying agent that integrates deoxidation, carburization and adjustment of manganese content in steel. The utility model has the advantages of uniform particle size, large density and pure quality, does not pollute the molten steel after use, can improve the steelmaking efficiency, save energy, reduce the consumption cost of raw and auxiliary materials, and has the effect of deoxidation and carburization. Deoxidizer