Barium inoculant plays a vital role in the casting process, which is not only a key additive to improve the quality of cast iron, but also has multiple effects. First of all, it can significantly enhance the graphitized core, refine the graphite structure, promote the formation of A-type graphite, and thus improve the strength of cast iron; At the same time, for nodular cast iron, it can make the graphite smaller, rounded, and improve the nodularity grade. Secondly, silicon-barium inoculant can effectively reduce the supercooling degree of hot metal, promote the precipitation of graphite, significantly reduce the white tendency, reduce the relative hardness of castings, and then improve its machining performance. In addition, it also has excellent anti-recession ability, anti-recession time is twice that of traditional 75 ferrosilicon inoculant, and the addition amount is lower, effectively preventing spheroidization decline. At the same time, the sensitivity of the wall thickness of the silica-barium inoculant is small, which helps to improve the uniformity of the section and reduce the tendency of shrinkage and loosening. Its chemical composition is stable, the processing particle size is uniform, to ensure the stability of product quality. Finally, it is worth mentioning that the melting point of the silica-barium inoculant is lower than 1300°, and it is easy to absorb and melt during inoculation treatment, and there is very little scum. Its main components include silicon, barium, calcium, aluminum and so on.
