《》20103910Material&HeatTreatmentQ345Q345A、Q345B、Q345C、Q345DQ345E,,。,(),,1。,,,,Q345。。11.1Q3451.1.1CC,,,,C,0.12%~0.15%(,)。1.1.2MnMnA+F,Mn,,。w(Mn)≥1.2%,,w(Mn)≥1.5%,,Mn1.2%~1.5%。1.1.3TiTi,,Ti,,TiN,,Ti。1.1.4Nb,,[1]。。Nb、VQ3451,2(1.,113001;2.,113001):,,,Q345,。:Q345;;;;:TG142.41:A:1001-3814(2010)10-0087-03StudyonEffectFactorsofImpactDuctilityofQ345SeriesSteelWANGYunling1,FENGGuiping2(1.SchoolofMechanicalEngineering,LiaoningShihuaUniversity,Fushun113001,China;2.TechnologyCenterofFushunSpecialSteelCo.,Itd.,Fushun113001,China)Abstract:ImpactductilityofQ345seriessteelwasimprovedbycontrollingcomposition,adoptingmicro-alloytheoryandcontrolledrollingcontrolledcoolingtechnics.Theimpactductilityrequestcanbesatisfiedbyadoptingreasonableheattreatmentprocess.Keywords:Q345seriessteel;microthermimpact;micro-alloy;controlledrollingcontrolledcooling;heattreatment:2009-10-27:(1971-),,,,,,;:13942366283;E-mail:wangyunling407@163.com1Q345Tab.1MechanicalpropertiesrequestofQ345seriessteelσs/MPaσb/MPaδ(%)AKV()/J20℃0℃-20℃-40℃Q345A≥295470~630≥21Q345B≥295470~630≥21≥34Q345C≥295470~630≥22≥34Q345D≥295470~630≥22≥34Q345E≥295470~630≥22≥2787HotWorkingTechnology2010,Vol.39,No.10Material&HeatTreatment20105,,[2]。Nb,,。Nb0.035%~0.055%。1.1.5P、SP、S,SP,P0.010%,S0.005%。1.2Q3451.2.1,。,(),[3]。,,,,,,,1140~1160℃。1.2.2,。,,:Ar3,,,、,。850~900℃,,,,,,500℃。,,,。1。1.3Q3451.3.1Q345D、C、E,,,。,,(0℃),2。,≤800℃,,AKV,≥800℃,AKV。650℃,650~800℃,800~850℃。。,800~850℃。1.3.2++、、。,,[4]。,,。Q345D、Q345E2,3。2,,-20℃、-40℃,-20℃,,+,。930℃+450℃,,-20℃-40℃。3,F+P+B,F+P+B,F+P+B,10μm10μm1Fig.1Microstructurecomparisonofhot-rollingandcontrolledrollingcontrolledcooling(a)(b)σ/MPa7805202600300250200150100500500550600650700750800850/℃δ(%),ψ(%),AKV/JσsδψAKVσb2Fig.2Effectsofannealingtemperatureonimpactproperties88《》20103910Material&HeatTreatment(86)LJ-5000,,6。5(1)。(2)1Cr10Co6MoVNbN。(3)、,。:[1].[M].:,1999.222-238.[2].[M].:,1977.67-80.[3].[M].:,2008.280-320.[4],,.Cr23Ni18[J].,2007,36(9):75-77.σb/MPaσbH/MPaσbH/σb1000~1140≥1540112017701.586Tab.6Theresultsofnotchtensiletest+F+P+S。,。2(1)、,Q345B、Q345C。(2)Q345C800~850℃,0℃。(3)+,-20℃-40℃,930℃+450℃,Q345D、Q345E,。:[1].·[M].:,2003.[2],,.Q345E[J].,2009,38(10):80-83.[3]M,.[M].:,1984.[4].-[M].:,1999.σs/MPaσb/MPaδ(%)AKV/J(-20℃)AKV/J(-40℃)4056102928、14、338、8、104156153034、43、3426、24、20800℃3635503456、49、5740、20、26930℃×1.5h+400℃×3h3455803058、77、3732、52、26930℃×1.5h+450℃×3h3505903079、81、9748、43、54930℃×1.5h+500℃×3h3405702971、45、7959、62、362Q345DQ345ETab.2EffectofheattreatmentprocessesonmechanicalpropertiesofQ345DandQ345E89