Silicon barium inoculant is mainly used in the production of gray cast iron and ductile iron. Used in nodular cast iron can significantly increase the number of graphite balls, and used in gray cast iron can reduce the tendency of white mouth. Refine grains and improve graphite morphology. In addition to obtaining higher mechanical properties, these inoculants also have strong anti-decay ability. Generally, the inoculants contain Ba between 2% and 3%.