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1、第31卷第3期北京科技大学学报Vol.31No.32009年3月JournalofUniversityofScienceandTechnologyBeijingMar.2009硫化氢环境下两种不锈钢的应力腐蚀开裂行为刘智勇董超芳李晓刚王立贤郅青梁平北京科技大学腐蚀与防护中心;北京市腐蚀、磨蚀与表面技术开放实验室,北京100083摘要用U形弯试样浸泡和慢应变速率拉伸实验研究了3Cr17Ni7Mo2SiN和00Cr22Ni5Mo3N(2205)不锈钢在硫化氢介质中的应力腐蚀开裂(SCC)行为.2205不锈钢的SCC萌生孕育期较长,在pH较低的饱和H2S溶液中具有明显的SCC敏感
2、性,其SCC敏感性随溶液pH值的升高或H2S含量的降低而迅速降低.3Cr17Ni7Mo2SiN的SCC孕育期均低于2205不锈钢,在3-1pH≤415、H2S的质量浓度≥10mg·L的H2S介质中均具有明显的SCC敏感性,其SCC敏感性受pH值和H2S含量变化影响较小.3Cr17Ni7Mo2SiN的SCC以沿晶裂纹萌生,扩展后转变为穿晶应力腐蚀开裂;2205不锈钢近表面处首先发生奥氏体-铁素体相间氢致开裂,并促进SCC萌生,其SCC为穿晶应力腐蚀开裂.关键词不锈钢;硫化氢;应力腐蚀开裂;慢应变速率拉伸分类号TG142171Stresscorrosioncrackingbeh
3、aviouroftwostainlesssteelsinhydrogensulfideenvi2ronmentLIUZhi2yong,DONGChao2fang,LIXiao2gang,WANGLi2xian,ZHIQing,LIANGPingCorrosionandProtectionCenter,UniversityofScienceandTechnologyBeijing;BeijingKeyLabofCorrosionErosionandSurfaceTechnique,Beijing100083,ChinaABSTRACTStresscorrosioncracki
4、ng(SCC)of3Cr17Ni7Mo2SiNand00Cr22Ni5Mo3N(2205)stainlesssteelsinacidichydrogensulfidesolutionswasinvestigatedbyslowstrainratetensiletestandU2bentspecimenimmersingtest.ThetimetoSCCfailureof2205stainlesssteelwasmuchlongerthanthatof3Cr17Ni7Mo2SiNstainlesssteel.2205stainlesssteelwashighlysuscept
5、ibletoSCCatalowerpHlevelinsaturatedH2Ssolution,anditsSCCsusceptibilitysharplydecreasedwithincreasingpHvalueordecreasingH2Scon2centrationinsolution.3Cr17Ni7Mo2SiNstainlesssteelshowedahighsusceptibilitytoSCCinsolutionwithaH2Sconcentrationhigh23-1erthan10mg·LandpH≤415.However,thesusceptibilit
6、yvariedslightlywiththechangeofpHvalueandH2Sconcentration.SCCof3Cr17Ni7Mo2SiNstainlesssteelinitiatedinanintergranularmode,whichtransformedintotransgranularcrackingastheSCCpropagatedfurther.For2205stainlesssteel,SCCoriginatedattheplacewherehydrogen2inducedcracking(HIC)occurredalongtheferrite
7、/austenitematrixboundariesfirstly,andthenpropagatedtransgranularly.KEYWORDSstainlesssteel;hydrogensulphide;stresscorrosioncracking;slowstrainratetension双相不锈钢具有很好的抗氯化物应力腐蚀开裂能还没有公开的研究报道.本文结合我国西南气田的性能和一定的抗H2S应力腐蚀开裂(SCC)的能的H2S分压(浓度)和氯离子含量等实际条件,研究[1-4]了3Cr17Ni7Mo2S
