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1、EngineeringFailureAnalysis21(2012)1–8ContentslistsavailableatSciVerseScienceDirectEngineeringFailureAnalysisjournalhomepage:www.elsevier.com/locate/engfailanalAnalysisofethylenecrackingfurnacetubesa,⇑baaS.H.Khodamorad,D.HaghshenasFatmehsari,H.Rezaie,A.SadeghipouraInspectionDepartment
2、ofJamPetrochemicalComplex(JPC),P.O.Box14155-6591,Asalouyeh,IranbAmirkabirUniversityofTechnology,DepartmentofMiningandMetallurgicalEngineering,Tehran,IranarticleinfoabstractArticlehistory:Theworkinglifetimeoftheradiantcoilstubes(RCTs)utilizedinethyleneproductionunitReceived14September
3、2011ofJampetrochemicalcomplex(Asalouyeh-Iran),islowerthanthenominallifetimeReceivedinrevisedform28November2011(100,000h)whichisthemainproblemofthisunit.Theaimofpresentstudywastoeval-Accepted28November2011uatetheimportantcharacteristicsoftheRCTsforidentificationthefailuremechanisms.Ava
4、ilableonline13December2011Tensiletest,hardnessandmicrohardnessanalyseswereemployedtoexaminethemechan-icalproperties.Also,scanningelectronmicroscopy(SEM)togetherwithenergydispersiveKeywords:spectroscopy(EDS)wereusedtocharacterizethemorphologicalfeaturesandchemicalEthyleneproductioncom
5、positionsofthesamples.TheseexperimentalresultsrevealedthatthecreepresistanceCarburizationCreepofRCTsdecreasesduetotheformationofcoarsegrainsandcoarseprimarycarbidelayersRadiantcoiltube(RCT)whichresultedfromcarburizationandoverheatingathightemperatures.Furthermore,adecreaseinductility
6、ofRCTsleadstothepropagationofmicro-cracksandtheembrittle-mentoftubes.Decokingandpassivationarethecrucialprocessesduringoperationcycleandtheuseofmaterialswithhighercreepandcarburizationresistancesisessentialforattaininglongerworkinglifetime.Ó2011ElsevierLtd.Allrightsreserved.1.Introdu
7、ctionGenerallyinthecrackingfurnaceofpetrochemicalindustries,wherethecrackingprocessofhydrocarbonsoccursatacertaintemperature,theradiantcoilstubes(RCTs)areknownasthecriticalparts.AnyfailureinRCTscanleadtoacompleteshut-downofthesystem,explosionand/orotherdestructiveconsequences.Typical
8、lyRCTsaremad
