笔尖;
Penpoint fracture and breaking on the early course of drawing are caused by shrinkage void inside the rod;
断口呈笔尖状,在拉拔早期发生断裂是由于内部存在缩孔缺陷所致;
The penpoint fracture is main due to non-metallic inclusions and center segregation.
笔尖状断裂主要由非金属夹杂和中心偏析造成;
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