Abstract
This paper deals with the graphitizing condition of graphitic steel (Graph-Sil), containing 1.1∼1.5% C and 0.7∼1.5% Si at elevated temperature. The experiments were carried out on forgeability, graphitization, change of hardness and microstructure of this steel by graphitization annealing. As is the case in gray cast iron, the silicon content of graphitic steel is the main factor controlling the precipitation of free graphite. However, to forge graphitic steel its silicon content must be held within definite limits. As above, the standard composition of graphitic steel is determined as 1.3∼1.5% C and 1.0∼1.5% Si and the suitable content of graphite is about 0.6%.
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