单词penpoint
na.: 〈美〉(钢)笔尖
笔尖
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；
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；