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在汽车和拖拉机缸套生产中,国内部分工厂采用了中磷或高磷合金铸铁,也有的工厂采用含锡、锑、钼、铜等合金铸铁。高、中磷合金铸铁不但所要求的磷共晶网孔直径较小,在生产条件下难以达到,而且磷共晶的显微硬度也比较低,影响了耐磨性的进一步提高。其它合金铸铁虽然耐磨性有一定程度的提高,仍满足不了国内汽车、拖拉机行业发展的需要,为此有寻找新的耐磨材料的必要性。 在认真学习无产阶级专政理论,认真贯彻落实四届人大提出的各项战斗任务的大好形势下,自七五年五月一日开始,朝阳县胜利公社综合厂和沈阳机电学院铸铁专业开门办学的师
In the production of automobile and tractor cylinder, some factories in China adopt medium-phosphorus or high-phosphorous alloy cast iron, and some factories use alloy cast iron containing tin, antimony, molybdenum and copper. High and medium phosphorus alloy cast iron not only requires smaller diameter of phosphorus eutectic mesh, which is difficult to reach under the production conditions, and the microhardness of phosphorus eutectic is also relatively low, which affects the further improvement of wear resistance. Although the other alloy cast iron has a certain degree of wear resistance improvement, it still can not meet the needs of the development of domestic automobile and tractor industries. Therefore, it is necessary to find new wear resistant materials. Under the conscientious study of the theory of the dictatorship of the proletariat and the conscientious implementation of various combat tasks put forward by the Fourth National People’s Congress, since May 1, 1975, the Victory Commune Complex in Chaoyang County and the cast iron specialty in Shenyang Institute of Electrical and Mechanical Engineering have opened their doors to run schools division