The result proves that the accumulate line is caused by heat treatment defect, soft troostite tape.

结果表明，活塞杆在磁粉探伤中显现的螺旋形磁粉堆积线是由热处理缺陷一屈氏体软带造成的。

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The result proves that the accumulate line is caused by heat treatment defect, soft troostite tape.

结果表明，活塞杆在磁粉探伤中显现的螺旋形磁粉堆积线是由热处理缺陷一屈氏体软带造成的。

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