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灰口铸铁是应用最广的金属材料之一。对于要求较高的零件，灰铁表面应光滑，上下层的组织差异不大，且有一定的抗振性和较高的耐磨性。多年来，在实际生产中难以保证上下层的组织密度和硬度要求，一直是人们所重视的课题。我们采用加入浇铸添加剂的方法，解决了此项难题。 （１
Gray cast iron is one of the most widely used metallic materials. For the higher requirements of the parts, gray iron surface should be smooth, the upper and lower layers of tissue is not large, and have a certain degree of vibration resistance and high wear resistance. Over the years, it is difficult to ensure the organizational density and hardness requirements of the upper and lower layers in actual production, which has always been the subject of great attention. We adopted the method of adding casting additives to solve this problem. (1