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北京电车公司修配厂生产的加稀土元素的球墨铸铁曲轴,截止目前为止,已在公共汽车上装了44根。其中的第一根在1964年10月底保养时,使用了一年整,曲轴正常地行驶了66071公里,轴颈的平均磨损量只有0.023毫米(磨损量到1.5毫米时报废)。比较钢曲轴还耐磨,因而公共汽车公司反应很好。电车公司修配厂和清华大学协作,试制用电炉生产球墨铸铁是1962年11月开始的。试验之初,球化处理时是单独用镁作球化剂,即使炉料中加镁量高达0.3%,但铸铁的金相组织中除圆整的球状石墨外,还掺杂着爪状石墨片,因而机械性能不能提高。试验得出,这是因为铁水中的
Beijing tram company repair factory production of rare earth elements plus ductile iron crankshaft, so far, has been installed in the bus 44. The first of these was in service for one year at the end of October 1964. The crankshaft was traveling normally with a total length of 60,671 kilometers and the average amount of journal wear was only 0.023 millimeters (scrapped to 1.5 millimeters). The steel crankshaft is also wear-resistant, so the bus company responded well. Tram company repair plant and Tsinghua University collaboration, trial production of ductile iron with electric furnace is November 1962 began. At the beginning of the experiment, when balling treatment, magnesium was used alone as the nodulizer, even though the amount of magnesium in the charge was as high as 0.3%, in addition to rounded graphite, the cast iron was doped with claw graphite sheet , So mechanical properties can not be improved. The experiment concluded that this is because of the molten iron