In the "Grinding - Calcination -Grinding" cement production line, the three core equipment "mill-kiln-mill" all require the component girth gears, so the quality of the girth gear is directly related to the normal operation of the entire production line. The quality of the girth gear is mainly related to the selection of the material and its heat treatment process. According to the experience of CHAENG for many years, the girth gear requires the tooth surface to have high hardness and wear resistance, and the tooth core to have sufficient toughness. The girth gear with complex shape and large diameter usually uses carbon steel and alloy steel with a carbon content of about 1.4% to ensure quality, so ZG35Mn, ZG35CrMo, and ZG42CrMo are mostly used as casting materials. The following is the composition of ZG35Mn, ZG35CrMo, and ZG42CrMo: The following is a comparison of the mechanical properties of ZG35Mn, ZG35CrMo, and ZG42 CrMo:

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