This paper introduces the principle and tested results of measuring nodulizing grade by audio frequency method.
介绍了音频法检测铸件球化级别的原理及试验结果。
On a certain condition, when the nodulizing grade of graphite of as cast ductile iron is grade 1 to 4, its mechanical properties are qualified.
在一定的条件下，当QT 45010铸态球铁的石墨球化级别为1 ~ 4级时，其机械性能合格。
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