大型LNG低溫儲罐用9Ni鋼的焊接及組織性能研究.pdf

1、西安石油大學碩士學位論文大型LNG低溫儲罐用9Ni鋼的焊接及組織性能研究姓名：李奮昆申請學位級別：碩士專業(yè)：機械工程指導教師：李臻薛洲20091015英文摘要Subject：TheTechnicalstudyonweldingandmicrostructureof9％NisteelsforlowtemperatureserviceinlargescaleLNGstoragetankSpeciality：MachinaryEngineer

2、ingName：LiFenkun(signature—≤二2圣竺塑Instructor：LiZhenXueZhou(signature)2l：2厶曼絲(signature)洫蔓互紐ABSTRACTFollowsthedomesticandforeignLNGengineeringconstructionquantityincrease，thelowtemperatureLNGstoragetankusedmaterial9％Nickel

3、steeldemandalsorapidlyincreases，SOmasteringtheLNGlowtemperaturestoragetank’Sweldingprocess，willbetheprofoundstrategicsenseThroughanalysedthedomesticandforeignliquefiednaturalgasenergy’Sdevelopmenttrend，somethingbefoundli

4、quefiednaturalgas’SdevelopmentopportunitiesarehugeTheliquefiednaturalgasenergy’SdevelopmentpromotedtheTerminalreceivingdevicedevelopmentsomestudybemadetoelaboratedtheLNGstoragetankwith9Nisteel’Seachperformanceindetails，a

5、ndanalyzesandcontrasts9NisteelinthedifferentnationalcurrentstandardrequestThroughtothelarge—scaleLNGlowtemperaturestoragetankwiththe9Nisteel’Sweldingperformance’Sresearch，graspstheimportandthedomesticallyproducedtwokindo

6、f9Nisteelandfourkindsofweldingprocesses，mainlyincludingshieldedmetalarcwelding、gasshieldedarcwelding、argontungsten—arcweldingandautomaticsubmergedarcweldingunionmeltwelding，carriesonthequalityexaminationtotheobtainedweld

7、joint(includingoutwardappearanceexamination，seepageexamination，rayexamination)，andcarriesonthehardnesstest，thelowtemperatureimpacttest，theordinarytemperaturepullingtest，theroomtemperaturebendtest，themetallographictestand

8、SOonThesyntheticstudyontwokindof9Nisteelweldjoint’SoverallperformanceobtainedbythisfourkindofweldingprocessandobtainstheappropriateweldingprocessevaluationThepresentpaperpassedthroughtheabovefourkindofweldingprocessandim

9、portsthe9Nisteelweldingperformanceandthesuitableweldingprocesstothedomesticallyproduced9Nisteelhasconductedthedissect，mademoreSuccess，theresearchhasindicatedthatthedomesticallyproduced9Nisteelandimportedthe9Nisteeltobeab

10、letoattainthequalifiedweldjointinfourkindofweldingprocesses，thebuttweldcraftresearchhasobtainedthesuccessAndinviewof160，000cubicmeterLNGstoragetank，thedetailedfeasibleweldingconstructiontechniqueinstructionhasbeenformula