某电厂低温再热器三叉管表面缺陷原因分析梁宝琦(哈尔滨锅炉厂有限责任公司,黑龙江哈尔滨150046)摘要:某电厂低温再热器材质为SA-182MF91的三叉管,运行数月后泄漏导致被迫停炉。通过宏观观察、化学成分分析、力学性能检测和金相组织观察等方法,分析确定三叉管发生泄漏的原因。分析认为,三叉管的化学成分和硬度均符合ASMESA-182M标准对F91材料的要求,三叉管外表面补焊产生的焊缝结构是导致裂纹萌生扩展并最终泄漏的主要原因,裂纹在三叉管最终热处理前已存在。关键词:低温再热器;SA-182MF91;三叉管;泄漏中图分类号:TM621文献标识码:B文章编号:CN23-1249(2023)02-0040-03FailureanalysisofheatexchangepipeelbowinathermalpowerplantLIANGBaoqi(HarbinBoilerCompanyLimited,Harbin150046,China)Abstract:Thelow-temperaturereheaterofapowerplantwasmadeofSA-182MF91trifurcatedtube,whichwasforcedtoshutdownduetoleakageafterseveralmonthsofoperation.Throughmacro⁃scopicobservation,chemicalcompositionanalysis,mechanicalpropertytestandmetallographicstruc⁃tureobservation,thecausesoftheleakageofthetrifurcatedtubewasanalyzedanddetermined.Theanalysisshowsthatthechemicalcompositionandhardnessofthetrifurcatedtubemeettherequire⁃mentsofASMESA-182MstandardforF91material.Theweldstructureproducedbytherepairweldingoftheexternalsurfaceofthetrifurcatedtubeisthemaincauseofcrackinitiation...