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1、第38卷第3期天津大学学报Vol.38No.32005年3月JournalofTianjinUniversityMar.2005国产X70管线钢与焊接接头组织及SSCC性能3111,21,2李云涛,杜则裕,陶勇寅,李建军(1.天津大学材料科学与工程学院,天津300072;2.河北石油职业技术学院焊接工程系,廊坊065000)摘要:输气管道的服役条件多为潮湿环境,输送介质含H2S.随着国产X70管线钢在西气东输工程中的应用,国产高强度管线钢硫化物应力腐蚀开裂(SSCC)性能研究显得尤为重要.为此,测试、分析了国产X70管线钢及其焊缝的组织,进一
2、步采用慢应变速率法(SSRT)研究了H2S对国产X70管线钢及其焊接接头SSCC的影响,国产X70管线钢及其焊接接头在含H2S腐蚀介质中应力腐蚀敏感性随H2S浓度的增加而增加,在H2S质量分数为50×10-4Þ0Þ0Þ0Þ00时,母材的脆性系数为19.950,焊缝的脆性系数高达59.190.若以250视为安全值,则在H2S浓度为50×-4010Þ0时的母材就SSCC而言是安全的,而焊缝却是不安全的.关键词:国产X70管线钢;焊接接头;组织;硫化氢;硫化物应力腐蚀开裂中图分类号:TG142;TG457.6文献标志码:A文章编号:04932213
3、7(2005)0320274205MicrostructuresandSSCCPropertiesforBaseMetalsandWeldingJointsofDomesticX70PipelineSteels111,21,2LIYun2tao,DUZe2yu,TAOYong2yin,LIJian2jun(1.SchoolofMaterialsScienceandEngineering,TianjinUniversity,Tianjin300072,China;2.DepartmentofweldingEngineering,HebeiTec
4、hnicalCollegeofPetroleumProfession,Langfang065000,China)Abstract:WiththeapplicationofdomesticX70pipelinesteelsintheprojectof“gastransmittingfromwesttoeast”,theymostlyserveinwetenvironmentswithH2S.Inordertopreventpipelinesteelsfrommorelossinad2vanceofcracking,thestudyonsulfi
5、destresscorrosioncracking(SSCC)propertiesfordomesticX70pipelinesteelsbecamemoreandmoreimportant.Thereforemicrostructuresofbasemetalsandweldsweretestedandan2alyzed,andslowstrainratetest(SSRT)wasfurtheradoptedtostudytheresistanceofSSCCofX70steelsandweldingjoints,theeffectofco
6、ntentofH2Soncorrosionpropertiesofpipelinesteelswasdiscussed.TheresultsrevealedthatwiththeincreasingofH2Sconcentration,resistanceofSSCCwouldincrease.WhenH2Sconcen2-4Þ0Þ0trationwas50×100,brittlenesscoefficientofbasemetalwas19.950,andbrittlenesscoefficientofweldingjointwas59.1
7、9Þ00.AsfarasSSCCwasconsidered,ifitwasassumedsafevaluewhenbrittlenesscoefficientwas25Þ00,domesticX70steelbasemetalsweresafe,whileitsweldingjointswerenotinthemediumwith50×-4010Þ0H2Sconcentration.Keywords:domesticX70pipelinesteels;weldingjoints;microstructure;H2S;sulfidestress
8、corrosioncrack2ing石油和天然气作为国民经济发展的重要基础已被高压输气管线有6种失效机制(脆性断裂、H2S或世界各国所重视,随着我国国民经济的快速发
