The element of graphitization is silicon. The amount of metallurgical organization in the matrix organization increases, and the amount of water glass casting furnace bar iron decreases, which can increase the silicon content and improve the graphitization level of cast iron. The hemp mouth or white mouth iron organization is easy to occur, if the silicon content is too low, graphitization is poor. But the silicon content is too high, it is easy to make the graphite solid and reduce the mechanical properties. In addition, in the order of adding furnace charge, the process regulations of adding manganese, then carbon, then silicon should be strictly enforced. If the cast iron does not need manganese, should follow the principle of adding carbon first and then silicon. The absorption effect of carbon additive is influenced by silicon and sulfur. Manganese is an element that hinders graphitization by increasing the amount of iron body in the cast iron base material. In general, the water glass casting parts manganese content control at 0, must ensure that the cast iron ferrite.6% - 1. 2% of the range. Manganese content is too high, the cast iron organization is prone to random pearlite, showing the tendency of white mouth iron. Manganese can be dissolved in the metallographic organization to produce substitution ion crystals, and also can be dissolved in the pearlite to produce magnesium pearlite. The fusion of manganese in pearlite will enhance the fusion of iron and carbon, making the pearlite more stable and thus hindering graphitization. Manganese can express its effect on graphitization according to the remaining part only after the chemical change with sulfur.
The following reflections can occur with a greater infection between manganese and sulfur
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