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采用交、直流磁粉检验并结合金相试验、电子探针试验及微量元素含量分析的方法，对３００Ｍ钢磁痕现象的本质进行了分析。结果表明，采用磁粉检验方法对航空优质钢进行纯洁度检验是可信的。
The nature of magnetic marks in 300M steel was analyzed by AC and DC magnetic particle test combined with metallographic test, electronic probe test and trace element content analysis. The results show that the use of magnetic particle testing of aviation quality steel purity test is credible.