Test specimens shall be taken after all non-destructive testing (NDT) has been carried out and which has passed the relevant inspection criteria for the NDT method(s) used.

试样的截取应在所有非破坏性试验（NDT）已经完成并已经通过所用NDT方法的相关检查依据后进行。

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Metal Magnetic Memory Testing (MMMT) is a new technology in metal non-destructive test (NDT). MMMT is not only used for failure early diagnosis, but also for defective inspection of steel casting.

金属磁记忆检测是无损检测领域的一项新技术，不仅可以对钩尾框的失效进行早期诊断，而且可以对钩尾框缺陷进行准确检测。

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