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The demands for high temperature metallic applications requires increased thermal (i.e., microstructural and dimensional) stability due to ever tightening tolerances, restrictive designs and higher Internal Combustion Engine (ICE) operating temperatures. Furthermore, these demands have caused the industry to place restrictive microstructure specifications on ductile iron production to ensure dimensional stability for certain applications. The presence of a distribution of precipitate phase was identified in Si-Mo iron as that with the Fe2MoC-type structure, or less predominantly with a two-phase Fe2MoC/M6C-type structure, which is often mistaken for pearlite. This structure may provide Si-Mo irons with an inherent microstructure advantage with respect to dimensional stability at elevated temperatures, relative to alternative ductile iron materials containing a pearlitic microstructure.