This paper reviews the original work of the authors published recently, describing the inlfuence of B on the matrix of the Cu-added spheroidal graphite cast iron. The effect of Cu has been corrected as a ferrite formation promoter in the matrix of the grey cast iron by the usage of high-purity material. Also, this paper focuses on the ferrite formation and the observation of the Cu distribution in the B-added and B-free Cu-containing spheroidal graphite cast iron. The Cu iflm on the spheroidal graphite can be successfuly observed in the B-free sample using a special etching method. However, in the B-added sample, no Cu iflm could be found, while the secondary graphite was formed on the surface of the spheroidal graphite. The interaction between B and Cu is stressed as a peculiar phenomenon by the employment of a contrast experiment of B and Mn. The heat treatment could make Cu precipitate more signiifcantly in the eutectic cels and in the matrix in the form of large Cu particles because of the limited solubility of Cu.
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