D01:10.13374.isml00103x.2009.B.B8 第31卷第3期 北京科技大学学报 Vol.31 No.3 2009年3月 Journal of University of Science and Technology Beijing Mar.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仲实验研究了3Cr17Ni7Mo2SN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 pH≤4.5、HS的质量浓度103mgL1的HS介质中均具有明显的SCC敏感性，其SCC敏感性受pH值和HS含量变化影 响较小.3Cr17N7Mo2SiN的SCC以沿品裂纹萌生，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一 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TG142.71 Stress corrosion cracking behaviour of two stainless steels in hydrogen sulfide envi- ronment LIU Zhi-yong,DONG Chao-fang.LI Xiao-gang.WANG Li-xian.ZHI Qing,LIANG Ping Corrosion and Protection Centen University of Science an Technology Beijing:Beijing Key Lab of Corrosion Erosion and Surface Techniqe,Beijing 100083 China ABSTRACT Stress corrosion cracking (SCC)of 3Cr17Ni7Mo2SiN and 00Cr22N i5 Mo3N (2205)stainless steels in acidic hy drogen sulfide solutions wasinvestigated by slow strain rate tensile test and U-bent specimen immersing test.The time to SCC failure of 2205 stainless steel w as much longer than that of 3Cr17Ni7Mo2SiN stainless sted.2205 stainless steel was highly susceptible to SCC at a lower pH level in saturated H2S solution and its SCC susceptibility sharply decreased with increasing pH value or decreasing H2S con centration in solution.3Cr17Ni7Mo2SiN stainless steel show ed a high susoeptibility to SCC in solution with a H2S ooncentration high- er than 10 mg'L and pHs4.5.However the susceptibility varied slightly with the change of pH value and H2S concentration. SCC of 3Cr17Ni7Mo2SiN stainless steel initiated in an intergranular mode w hich transformed into transgranular cracking as the SCC propagated further.For 2205 stainless steel SCC originated at the place w here hy drogen-induced cracking (HIC)oocur red along the ferrite austenite matrix boundaies firstly,and then propagated transgranularly. KEY WORDS stainless steek hy drogen sulphide;stress corrosion cracking;slow strain rate tension 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HS应力腐蚀开裂(SCC)的能的HS分压（浓度）和氯离子含量等实际条件，研究 力，而且含镍量低，具有价格优势，常被用来代了3Crl7Ni7Mo2SiN、00C22Ni5Mo3N(2205不锈 替奥氏体不锈钢应用到湿H2S环境中. 钢)两种不锈钢在不同HS含量及pH值条件下的 3Crl7Ni7Mo2SiN不锈钢是我国自行开发的低镍抗 应力腐蚀发生规律，探索00Cr22Ni5Mo3N不锈钢 H2S奥氏体不锈钢，但是其耐H2S应力腐蚀开裂性 替代3CrI7Ni7M2SiN钢使用的范围和条件，为国 收稿日期：200805-28 基金项目：国家自然科学基金资助项目(N0.50401016) 作者简介：刘智勇(1978一).男.博士研究生.E-mils20030489@163.cmm:李晓刚(1963一，男，教授博士生导师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 pH ≤4.5 、H2S 的质量浓度≥10 3 mg·L -1的 H2 S 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 TG142.71 Stress corrosion cracking behaviour of two stainless steels in hydrogen sulfide envi￾ronment LIU Zhi-yong , DONG Chao-fang , LI X iao-gang , WANG Li-xian , ZHI Qing , LIANG Ping Corrosion and Protection Center, University of S cience and Technology Beijing ;Beijing Key Lab of Corrosion Erosi on and Surf ace Technique , Beijing 100083 , China ABSTRACT Stress corrosion cracking (SCC)of 3Cr17Ni7Mo2SiN and 00Cr22Ni5Mo3N (2205)stainless steels in acidic hy drogen sulfide solutions w asinvestig ated by slow strain rate tensile test and U-bent specimen immersing test .The time to SCC failure of 2205 stainless steel w as much lo nger than that of 3Cr17Ni7Mo2SiN stainless steel .2205 stainless steel was hig hly susceptible to SCC at a lower pH level in saturated H2S solution, and its SCC susceptibility sharply decreased with increasing pH value o r decreasing H2S co n￾centration in solution.3Cr17Ni7Mo2SiN stainless steelshow ed a hig h susceptibility to SCC in solutio n with a H2 S co ncentration high￾er than 10 3 mg·L -1 and pH ≤4.5 .However, the susceptibility varied slightly with the change of pH value and H2S concentratio n. SCC of 3Cr17Ni7Mo2SiN stainless steel initiated in an interg ranular mode , w hich transformed into transg ranular cracking as the SCC propaga ted further.For 2205 stainless steel, SCC origina ted at the place w here hy drogen-induced cracking (HIC)occurred alo ng the ferrite/ austenite matrix boundaries firstly , and then propagated transg ranularly. KEY WORDS stainless steel;hy drogen sulphide;stress co rrosion cracking ;slow strain rate tension 收稿日期:2008-05-28 基金项目:国家自然科学基金资助项目(No .50401016) 作者简介:刘智勇(1978—), 男, 博士研究生, E-mail:s20030489@163.com ;李晓刚(1963—), 男, 教授, 博士生导师 双相不锈钢具有很好的抗氯化物应力腐蚀开裂 的性能和一定的抗 H2S 应力腐蚀开裂(SCC)的能 力 [ 1-4] ,而且含镍量低 , 具有价格优势 ,常被用来代 替 奥 氏 体 不 锈 钢 应 用 到 湿 H2S 环 境 中 . 3Cr17Ni7Mo2SiN 不锈钢是我国自行开发的低镍抗 H2S 奥氏体不锈钢, 但是其耐 H2S 应力腐蚀开裂性 能还没有公开的研究报道.本文结合我国西南气田 的 H2S 分压(浓度)和氯离子含量等实际条件 ,研究 了 3Cr17Ni7M o2SiN 、00Cr22Ni5Mo3N (2205 不锈 钢)两种不锈钢在不同 H2S 含量及 pH 值条件下的 应力腐蚀发生规律, 探索 00Cr22Ni5Mo3N 不锈钢 替代 3Cr17Ni7M o2SiN 钢使用的范围和条件, 为国 第 31 卷 第 3 期 2009 年 3 月 北 京 科 技 大 学 学 报 Journal of University of Science and Technology Beijing Vol .31 No.3 Mar.2009 DOI :10.13374/j .issn1001 -053x.2009.03.038