超临界机组高温再热器管裂纹分析  

Crack Failure Analysis of High Temperature Reheater's Tube in Supercritical Unit

作　　者：张赞赞 李勇军 林庆宇 高军 曾祥甫 Zhang Zanzan;Li Yongjun;Lin Qingyu;Gao Jun;Zeng Xiangfu(Guangxi Zhuang Autonomous Region Special Equipment Inspection and Research Institute,Nanning 530219;Aluminum Corporation of China LTD Guangxi Branch,Baise 531400;Guangxi Hualei New Material Co.LTD.Power Plant,Pingguo 531499)

机构地区：[1]广西壮族自治区特种设备检验研究院,南宁530219 [2]中国铝业股份有限公司广西分公司,百色531400 [3]广西华磊新材料有限公司发电厂,平果531499

出　　处：《设备监理》2021年第5期52-57,共6页Plant Engineering Consultants

摘　　要：国内某超临界机组高温再热器多处管子在相同位置出现裂纹失效,利用现场勘察、宏观检查、化学成分检测、硬度检测、金相分析、扫描电镜及能谱分析等技术,综合考虑机组实际运行工况,分析某超临界机组材质为SA-213TP347H的高温再热器管裂纹产生的原因。结果表明:焊接工艺控制不良、胀差、交变应力状态,共同导致疲劳裂纹萌生并扩展,并提出了相应的解决方案和预防措施。Several pipes of a domestic supercritical unit high temperature reheater appeared crack failure at the same position.By means of several kinds of means,like site investigation,macroscopic inspection,composition analysis,scanning electron microscope and energy spectrum analysis.Considering the actual operating conditions of the unit.The crack's reason analysis of the high-temperature reheater tube(the tubes made of SA-213TP347H)in a certain supercritical unit.The results show that the fatigue crack initiation and propagation are caused by poor welding process control,differential expansion and alternating stress.And put forward the corresponding solution and preventive measures.

关 键 词：高温再热器管 密封焊缝 交变应力 疲劳裂纹 

分 类 号：TB497[一般工业技术]