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1、AbstractAbstractAsthemosteconomicandefficientwayoftransportation,pipelinesteelforpetroleumandnaturalgashasbeeninusingtoday.Withthetransformationofminingarea，thecomplicatedgeologicalenvironmentandvariousclimatesuchasocean,desert,permafrostareasbecomeare
2、gionofpipelinelaying.Underthespecialenvironment，thepipelinesnotonlyneedhighhardnessandhightenacity,butalsoneedtohavegreatdeformation,weldingperformanceandexcellentcorrosionresistancetosatisfyincreasinglyrigorousdemandofsurroundings.Atthesametimewecan't
3、ignortheperformanceofweldedjoint,because,astheweakestofpipelinesteelwhichisextremelyeasilydamagedintheprocessofusing.Asaspecialenvironmentwithpipelinesteel,submarinepipelinesteelandlargestrainofpipelinesteelneedhaveexcellentabilityoflargedeformation,cr
4、ushingresistance,andweldingperformanceincommon,but,thedifferenceisthatsubmarinepipelinesteelneedstoconsidertheeffectofcorrosionofseawater,forhavinglongtimeunderlowtemperature,highpressure,strongcorrosionofthebottomofthesea.Thepaperisconcernedwiththebas
5、emetalandweldedjointofX65submarinepipelinesteelandlargestrainthickspecificationsofX80pipelinesteel.Bymeansoftensiletest,charpyimpacttest,DWTTandhardnesstests,andcombinedwiththeanalysisresultsofSEM,EDS,opticalmicroscope,strengthandtoughnessandcorrosionr
6、esistanceofX65submarinepipelinesteelandlargestrainthickspecificationsofX80pipelinesteelhavestudied.Theresultsofthestudyareasfollows:MicrostructureandmechanicalpropertiesofX65submarinepipelinesteelandweldjointwerecharacterizedusingtensiletests.Theresult
7、sprovethatlongitudinalandtransverseofbasemetalhasshowedhigherelongation,lowyieldratio,ithasabetterdeformationperformance.At-20°temperature,basemetal,weld,fusionlineandfusionline+2mmhavebeentestedforCharpyV-notch，andtheresultsindicatedthattheweldedjoint
8、hastheexcellenttoughness.Lastly,usingscanningelectronmicroscopy(SEM)observemicrostructureofbasemetal,weldandheataffectedzone.TheresultsofexperimentindicatedthatbasemetalcombinedwithferriteplusIII万方数据Abstractbainite,whichhasgreatmechanic
