The first kind of defects were outside fold, they generated in perforation and rolling not in heat treatment;

第一类外折缺陷并不是在热处理过程中产生的，而是产生在穿孔及轧制过程中；

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The first kind of defects were outside fold, they generated in perforation and rolling not in heat treatment;

第一类外折缺陷并不是在热处理过程中产生的，而是产生在穿孔及轧制过程中；

youdao