The use of cold molding materials can increase the cooling rate of lost foam moldings. The reuse rate of sand in vacuum lost foam casting is 98 %%, so the one-time increase in investment of special sand cannot be ignored, but the quality of casting is beneficial. The cooling rate of cold sand and sand is 1-4 times, much faster than conventional sand casting.
By adjusting and optimizing the chemical composition of the lost foam cast iron, the negative effects of slow solidification can be counteracted. For example, increasing the production of chromium ground balls on the one hand can increase the formation of chromium carbide by carbide, thereby significantly improving the hardness and content of the polished balls. The impact value looks like this.

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