normally 1 to 3 wt%, and consequently, these alloys should be considered ternary Fe-C-Si alloys. The principle of cast iron solidification, however, is understood from the binary iron-carbon phase diagram, where the eutectic point is at 1,154 °C (2,109 °F) and 4.3 wt% carbon. Since cast iron approximates this composition, its melting point of 1,150