球墨铸铁(简称球铁)近年来在机械行业得到了日益广泛的应用。准确地分析其总碳含量,对于配合球铁铸造工艺、铸件性能试验,提高球铁铸件内在质量,有着重要的意义。由于球铁中石墨碳的形态、分布以及与基体中铁的结合有其自己的特殊性,所以在制取总碳量分析样品时,不能与普通铸铁同样地对待。对于这一点,我们有个实践和认识的过程。我厂经常浇注的球铁是稀土-镁球铁,在过去很长一段时间里,总碳量的分析数据大多偏低并且不稳定,不能在生产中起到应有的作用。反而影响大炉配料和球铁铸件质量的提高。根据资料介绍,推荐在炉前取白口薄片样用作球铁总碳量分析,这个方法是可取的。但是在日常工 Ductile iron (ductile iron) in recent years in the machinery industry has been an increasingly widespread application. Accurately analyzing the total carbon content is of great significance for the ductile iron casting process, casting performance test and improving the inherent quality of ductile iron castings. As the shape and distribution of graphite carbon in the ductile iron and its combination with the iron in the matrix have their own particularities, they can not be treated in the same way as conventional cast iron when preparing a total carbon sample for analysis. For this, we have a process of practice and understanding. The ductile cast iron often cast by our factory is rare earth-magnesium ductile iron. In the past a long time, the analysis data of total carbon was mostly low and unstable, and could not play a proper role in the production. But affect the furnace ingredients and ductile iron casting quality improvement. According to the introduction of the data, it is advisable to take a white flake sample in front of the furnace for the total iron content of ductile iron. This method is preferable. But in everyday work