第44卷第4期2023年8月Vol.44.No.4August2023特殊钢SPECIALSTEEL12Cr1MoVG厚壁钢管高温正火+回火的组织和性能张银桥1,2,孔繁革1,2,张继宏1,2,王煜3,朱志宝1,2,李勇1,2,李海松1,2(1大冶特殊钢有限公司钢管研究所,黄石435001;2高品质特殊钢湖北省重点实验室,黄石435001;3上海锅炉厂有限公司,上海200245)摘要:通过显微组织观察和室温拉伸试验、室温冲击试验、硬度试验和高温持久性能试验,研究了Φ457mm×70mm12Cr1MoVG(/%:0.13C,0.21Si,0.56Mn,1.07Cr,0.31Mo,0.20V,0.008P,0.004S,0.02Ni,0.004Cu,0.0124Al)钢管在1000℃正火后采用水雾加速冷却和740℃回火的组织和性能。结果表明:显微组织为铁素体+贝氏体,贝氏体量约占65%,晶粒度7~5级;屈服强度为416MPa,抗拉强度为575MPa,室温冲击功为206~244J,布氏硬度187HBW;575℃×105h持久强度为86MPa;575℃/100MPa持久51480h未断;575℃/120MPa持久27198h断裂,试样开裂起源于晶界蠕变孔洞,周边贝氏体基体没有发现严重的球化等现象,组织稳定性优异。关键词:12Cr1MoVG厚壁钢管;组织与性能控制;贝氏体;高温持久强度DOI:10.20057/j.1003-8620.2023-00043中图分类号:TG156MicrostructureandPropertiesof12Cr1MoVGThick-wallSteelPipewithHighTemperatureNormalizing+TemperingZhangYinqiao1,2,KongFange1,2,ZhangJihong1,2,WangYu3,ZhuZhibao1,2,LiYong1,2,LiHaisong1,2(1SteelPipeProductsInstitute,DayeSpecialsteelCo.,Ltd.,Huangshi435001,China;2HubeiProvinceKeyLaboratoryforHighQualitySpecialSteel,Huangshi435001,China;3ShanghaiBoilerWorksCo.,Ltd.,Shanghai200245,China)Abstract:MicrostructureandpropertiesofΦ457mm×70mm12Cr1MoVGsteelpipe(/%:0.13C,0.21Si,0.56Mn,1.07Cr,0.31Mo,0.20V,0.008P,0.004S,0.02Ni,0.004Cu,0.0124Al)after1000℃normalizingplususingwatermistacceleratedcoolingand740℃temperingwerestudiedbymeansofmicrostructureobservation,tensiletest,impacttestatroomtemperature,hardnesstestandhightemperaturedurabilitytest.Theresultsshowedthatthemicrostructureconsistedofferriteandbainite,withthevolumeofbainiteaccountingfor65%,andthegrainsizeof7-5grade.Yieldstrengthwas416MPa,tensilestrengthwas575MPa,impactenergyatroomtemperaturewas206-244J,brinel...