综合技术孙刚：15CrMo钢换热器焊后分步局部热处理工艺油气田地面工程https://yqtd.cbpt.cnki.net15CrMo钢换热器焊后分步局部热处理工艺孙刚大庆油田工程建设有限公司建材公司摘要：15CrMo钢固定管板式换热器在预制过程中进行整体焊后热处理，很容易引起换热管与管板的焊缝开裂。为解决这一问题，在查阅相关资料并结合多年制造经验的基础上，经几次试验制订了分步局部热处理的工艺，在热处理后的无损检测及压力试验过程中均没有发现换热管与管板的焊缝发生泄漏，极大地保证了产品质量。试验结果表明，对管程及壳程全部采用15CrMo钢的固定管板式换热器，并使用分步局部热处理的方式可达到预期的消除焊后应力的要求。对15CrMo钢制换热管与管板的焊缝采用分步局部加热方式，既可满足热处理工件均温性的要求，又可达到消除应力的目的，为制造该类换热器积累了经验，提高了同类产品的市场竞争力。关键词：15CrMo换热器；管板；换热管；局部热处理Post-weldingStep-by-stepLocalHeatTreatmentProcessof15CrMoSteelHeatEx⁃changerSUNGangBuildingMaterialsCompanyofDaqingOilfieldEngineering&ConstructionCo.，Ltd.Abstract：The15CrMosteelfixedtubesheetheatexchangerundergoesoverallpost-weldingheattreatmentduringtheprefabricationprocess，whichcaneasilycausecrackingoftheweldseambetweentheheatexchangertubeandthetubesheet.Inordertosolvethisproblem，theprocessofstep-by-steplocalheattreatmentisdevelopedthroughseveraltestsbasedontherelevantdataandmanyyearsofman-ufacturingexperience.Intheprocessofnon-destructivetestingandpressuretestingafterheattreat-ment，thereisnoleakageoftheweldseambetweentheheatexchangertubeandthetubesheet，whichgreatlyensuresthequalityoftheproduct.Thetestresultsshowthatforthefixedtubesheetheatex-changerwith15CrMosteelforbothtubepassandshellpass，thestep-by-steplocalheattreatmentmethodcanachievetheexpectedpost-weldingstressreliefrequirements.Theweldseamof15CrMosteelheatexchangertubeandtubesheetheatedbystep-by-steplocalheattreatmentmethodcanmeettherequirementsoftemperatureuniformityofheat-treatedworkpieces，andalsocanachievethepur-poseofstressrelief.Keywords：15CrMoheatexchanger；tubesheet；heatexchangertube；localheattreatment在石油、化工、煤...
