主蒸汽管道差压变送器取样管失效分析  

Failure Analysis of Sampling Tube of Differential Pressure Transmitter in Main Steam Pipeline

作　　者：骆春泉 黄建林 熊晓 Luo Chunquan;Huang Jianlin;Xiong Xiao(Guangdong Dianyan Boiler Pressure Vessel Inspection Center Co.,Ltd.,Guangzhou 510525)

机构地区：[1]广东电研锅炉压力容器检验中心有限公司,广州510525

出　　处：《中国特种设备安全》2024年第4期86-91,共6页China Special Equipment Safety

摘　　要：某火力发电厂在运行期间主蒸汽管道流量计差压变送器取样管发生开裂,通过宏观观察分析、化学成分分析、金相组织分析、力学性能测试、断口分析等方法对该短管开裂原因进行分析。试验结果表明:管子外壁存在大量的显微晶间裂纹,以此为裂纹源,在腐蚀介质与拉应力的共同作用下,最终造成管子横向的应力腐蚀开裂。During the operation of a thermal power plant,the sampling tube of differential pressure transmitter in main steam pipeline cracked.The cracking causes of the tube was analyzed by means of macro examination,chemical composition analysis,metallographic examination,mechanical property test and fracture analysis.The results show that there are a large number of microscopic intergranular cracks on the outer wall of the tube,which are the crack sources.Under the combined action of the corrosive medium and the tensile stress,the transverse stress corrosion cracking of the tube is finally caused.

关 键 词：晶间腐蚀 敏化 应力腐蚀 

分 类 号：X933.4[环境科学与工程—安全科学]