石墨球化等级是衡量S195曲轴内在质量的重要指标,在对其进行铸态金相组织检验时,必须全面考核。在生产中,我们遇到同一支曲轴上和与扇板相连的浇道断口处有较多的黑点。对其进行金相分析,其石墨不球化,呈现大量的厚片状石墨,按金相图谱应判为5～6级;而在远离浇道的长头尾部取样观察,球化等级为3级,符合技术要求。由此说明,曲轴各部位的球化等级是有差别的。为弄清曲轴球化等级的分布规律,根据曲轴浇道断口的宏 Graphite ball grade is to measure the internal quality of the S195 crankshaft an important indicator of its cast as-cast microstructure examination, we must conduct a comprehensive assessment. In production, we encountered more black spots on the same crankshaft and at the runner fracture connected to the blade. Metallographic analysis of its non-spheroidized graphite, showing a large number of thick flaky graphite, according to the metallographic map should be sentenced to 5 to 6; and in the long head and tail away from runner sampling, ball grade 3 Level, in line with technical requirements. This shows that the various parts of the crankshaft level is different. In order to understand the distribution of crankshaft spheroidization level, according to the macro crankshaft sprue fracture