By controlling the cooling rate after coiling injection, the surface layer is rapidly cooled to form a certain depth of white structure, while the center part maintains a gray structure, and the middle transition layer is a wear resistance cast iron with a pockmarked structure. The white structure in the surface layer has higher hardness and wear resistance, while the gray structure in the center provides appropriate toughness and shock absorption performance. The chemical composition has a greater impact on the hardness and the depth of the white layer of chilled cast iron. Increasing the carbon content can increase the hardness of the white layer but reduce the depth of the white layer, while increasing the silicon content will reduce the depth of the white layer. chilled cast iron mostly uses high carbon and low silicon composition, and adds appropriate alloy elements to adjust the hardness, depth and overall strength and toughness of the white layer. According to the different chemical composition, it can be divided into ordinary chilled cast iron, nickel chromium molybdenum chilled cast iron, chromium molybdenum rare earth chilled cast iron, boron chilled cast iron, etc. chilled cast iron belongs to wear resistance cast iron, which is suitable for making work surfaces that require high hardness and wear resistance, while the rest of the parts need to have certain strength and toughness, such as roll, wheels, plowshares, etc.
No classification at present.