The medium chrome-silicon cast iron(290Cr8Si2) is studied for increasing the M7C3content in eutectic carbide in medium chrome cast iron.The valence electron structure of cast medium chrome-silicon cast iron matrix was set up and the effect of Si was analyzed by empirical electron theory of solids and molecules(EET).The analysis and experimental results show that the affinity between C and Si is stronger than that between C and Cr in γ-Fe lattice of medium chrome-silicon cast iron matrix containing C,Cr and ...