The drawing breakage of hard wire are classed from materials and technology. Its causes are analyzed, and some typical examples are put forward.

• 从原料和加工工艺方面对拉拔断裂原因进行分类；介绍了根据拉拔工艺、宏观断口分类分析来判断硬线拉拔断裂原因的方法和部分典型事例。