某电厂用T3紫铜输油管使用约半年时间发生断裂失效。采用宏观检验、断口微观分析、能谱分析、金相检验的方法，对该紫铜输油管的断裂原因进行了分析。结果表明：输油管的断裂类型属于应力腐蚀开裂；管内的长效润滑油中含有应力腐蚀敏感介质硫和氯元素，且输油管弯曲部位存在较大拉应力，导致该紫铜输油管发生应力腐蚀开裂。

One T3 red copper oil pipe of a power plant fractured after used for half a year. The fracture reasons of the red copper oil pipe were analyzed by methods of macrographic examination, fracture micro analysis, energy spectrum analysis and metallographic examination. The results show that:the fracture type of the oil pipe was stress corrosion cracking; the long-term lubricating oil contained the medium of chlorine and sulfur sensitive to the stress corrosion, and the tensile stress existed in the bending position of the oil pipe, and those factors resulted in the stress corrosion cracking of the red copper oil pipe.