Pre-inoculation effect of SiC furnace additions on microstructure, magnesium recovery, and castability in thin wall ductile iron plates were studied and compared with alternative FeSi75.Obtained results showed that pre-inoculation with SiC provides higher residual magnesium and better magnesium recovery (61.7 percent for SiC vs. 55.3 percent for FeSi75) when the same amount of FeSiMg-masteralloy was used. When the amount of FeSiMg-masteralloy for experimental heats using SiC was reduced by 11 percent the residual magnesium remained higher (0.033 percent vs. 0.032 percent) that in experimental heats using FeSi75 and standard amount of FeSiMg. Chill tendency in thin wall ductile iron plates was lower even in those experimental heats using SiC with residual magnesium higher 4.1 percent than in experimental heats using FeSi75 with the same carbon equivalent. Castability was found to be equal for both materials.
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