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:2006-12-29X801,2,1,1,1,2(1.,100081;2.,650093):,,,,Ti-B,,,(AF),,:X80;;;;:TG424:A:0253-360X(2007)07-097-040,,,,X80,X80,,X80[1,2]ReL550MPa,Rm620MPa,AkV-2070J[3-5]:(1),,;(2),;(3);(4),Ti(CN),Ti2O3BN,TiNTi2O3,HAZHAZ,[3,4];(5),,,;(6),,,11.11.1.1,YM751A;JBZ300GB/T26501989,300/150J;AG100KNE(50kN)UHF50A(250kN)GB/T256219891.1.2,907A,350mm150mm20mm1.1.3GB/T8110199528720077TRANSACTIONSOFTHECHINAWELDINGINSTITUTIONVol.28No.7July200780%Ar+20%CO21,1Table1WeldingparametersI/AU/Vv/(cmmin-1)E/(kJcm-1)T/22022407.30220222312.680854%,LEICAMEF4SCIAS6.0,HITACHIS4300,FUTURETECHFM4300,1.96N,10s1.22,362(,%)Table2ChemicalcompositionofdepositedmetalofexperimentalweldingwireCMnSiMoTiBNiSPOFe10.0300.900.420.200.0100.00181.190.0060.00600.04220.0440.940.500.160.0200.00061.060.0060.00670.03730.0660.940.520.180.0270.00081.040.0060.00600.03440.0561.400.460.240.00981.020.0060.00660.03350.0641.420.420.320.0161.040.0060.00500.0303Table3RoomtemperaturemechanicalpropertiesandlowtemperaturetoughnessandhardnessofdepositedmetalRm/MPaReL/MPaA(%)Z(%)AkVRT/JAkV(-20)/J(HV)154060025.570.5168.065.0214.9256062026.572.5188.0100.7230.5358564025.572.5224.7187.3242.3465071019.066.5138.778.7245.8563569520.568.5135.770.7246.66361567525.072.0AkV(-50)/JAkV(-70)/J1208417kJ/cm1.3X80X80,,36,,4TranscoX80,4X80Table4ImpactexperimentandtensileexperimentresultsofX80steelGMAWjointRm/MPaT/AkV(-20)/J123 A/J3750-201881801841846768-20180180166175.3GMAW690720MPa,-30120J-20175J,166J,Transco,X80GMAW22.12.1.1X80,,,,Evans[5]CMn,Mn1.4%9828,,(AF),,,C0.07%0.09%,1Mn/C,Mn/C,,,,,,C0.045%0.065%,Mn0.95%1.4%,1Mn/CFig11EffectofMn/Cratioondepositedmetalstoughness2.1.2TiB,Ti(CN),Ti2O3BN,,;,,,[6]Oh[3],0.04%0.05%Ti0.004%0.005%B95%,123,1B0.0018%,Ti0.01%,3,B2O3,Fe3(C,B),BN,,,23,,,,2.22.2.16,80%,2,2Fig12Microstructureofdepositedmetal2.2.23,43Fig13Inclusionasnuclearofmulti2acicularferrites4Fig14Inclusionasnuclearofacicularferrite7,:X8099,5AF,,53Fig15MophologyofinclusionofNo.3depositedmetal,AFKS,AF5,6SEM,C,O,Si,TiMn,,,AF[7,8],200800nmAF,6Fig16Energyspectrumanalysisofinclusion3(1)6,,,,X80,36X80(2),Mn/C,,;,,,Ti0.027%,B0.0008%,,(3),;AF,AF,AF:[1],,,.[J].,2002,25(1):1-10.[2].[J].,2003,26(3):1-10.[3]OhDW,OlsonDL,FrostRH.Theinfluenceofborronandtitaniumonlow2carbonsteelweldmetal[J].WeldingJournal,1990,69(4):151s-158s.[4]EvansGM.Theeffectoftitaniuminmanganese2containingSMAwelddeposits[J].WeldingJournal,1993,72(3):123s-133s.[5]EvansGM.TheeffectofcarbononthemicrostrctureandpropertiesofC-Mnall2weldmetaldeposits[J].WeldingJournal,1983,62(11):313s-320s.[6],,.[J].,2001,22(2):62-66.[7].[J].,1990,11(2):81-89.[8],,.[C].:,1990:11-15.:,,1979,3Email:lir51@yahoo.com.cn10028jointswereexaminedbymeansofOlympusopticalmicroscopeandscanningelectronmicroscope.AndtheVickersmicrohardnesspro2filesweremeasuredbyVickersmicrohardnesstester.Thecrackre2sistanceinY2grooveweldedjointswasalsocompared.Theexperi2mentresultsshowedthatthecrackresistanceoftheweldedjointus2ingH10MnSiwirewasbetterthanthatoftheweldmentusingH08Mn2Siwire,whichismainlyduetothefinecrystalgrainintheweldmetalandthemorecontentofacicularferrite.Keywords:armouredsteel;CO2shieldedarcwelding;mi2crostructure;crackresistanceDevelopmentofgasmetalarcweldingwireforX80pipelinesteelLIRan1,2,WEIJinshan1,PENGYun1,TIANZhiling1,SHIZhe2(1.StateKeyLaboratoryofAdvancedSteelProcessesandProducts,CentralIron&SteelResearchInstitute,Beijing100081,China;2.FacultyofMaterialsandMetallurgicalEngineeringKun2mingUniversityofScience&Technology,Kunming650093,Chi2na).p97-100Abstract:Thedevelopedwiresareusedforgasmetalarcwelding.Thechemicalcomposition,microstructure,impacttough2ness,strength,hardnessandtensilestrengthofweldedjointareinves2tigated.Themicrostructureiscomposedofacicularferriteandalittleproeutectoidferriteandalittlegranularbainite.Thefracturedsur2facesofimpactspecimenareanalyzedbyscanningelectronmicro2scope,andthemicrostructuresofweldmetalareanalyzedbytrans2missionelectronmicroscope.ExperimentresultsindicatedthatitwaseffectivetoresistproeutectoidferriteandmakefinehomogeneousacicularformationbyaddingmicrocontentTi-Belementsinthewire.Ithadbeenfoundthatalloyelementinweldmetalcouldbethenucleating2centersofacicularferriteaslongastheyformedfinedis2perseinclusion.Itiseffectivetopreventcrackpropagationandim2proveimpacttoughnessbecausetherearelotsofdislocationagglom2eratinginacicularferrite.Keywords:X80pipelinesteel;gasmetalarcwelding;low2temperaturetoughness;acicularferrite;inclusionMicrostructureandpropertyofPWHTweldmetalof800MPagradelowalloysteelZHAOXiaobing1,2,HEChanghong2,PENGYun2,TIANZhiling2,ZHENGBaozhong1,ZHAOXiubai3(1.SchoolofPhysicScienceandTechnology,YunnanUniversity,Kunming650091,China;2.InstituteforStructuralMaterials,Cen2tralIron&SteelResearchInstitute,Beijing100081,China;3.KaiyuanWeikePressureVesselCo.,Ltd,Kaiyuan112300,Liaon2ing,China).p101-104Abstract:Inordertoachievegoodtoughnessandstrengthinwelding10Ni5CrMoVsteel,heattreatmentisusuallycarriedouttoimprovethemechanicalpropertiesoftheweldmetal.10Ni5CrMoVsteelwasweldedwithrichArshieldinggas,andthemicrostructureandmechanicalpropertiesof