锅炉水冷壁下联箱定排管泄漏的原因
Leakage Cause of a Boiler Water Cooling Wall Exhaust Tube
摘 要
电厂锅炉水冷壁下联箱不锈钢定排管发生开裂并泄漏, 泄漏点位于距离焊缝15 mm的母材处。采用光学显微镜、扫描电镜和能谱分析以及应力分布的有限元分析等对开裂原因进行了分析。结果表明, 安装应力以及介质中的氯离子协同作用, 诱发了不锈钢定排管的应力腐蚀开裂, 最终导致泄漏。
有限元分析
安装应力
应力腐蚀开裂(SCC)
stainless steel
finite element analysis (FEA)
assemble stress
stress corrosion cracking (SCC)
Abstract
Leakage happened at the base-metal about 15mm away from weld-joint of a water cooling wall stainless steel exhaust tube in a power plant. The failure reason was analyzed by OM, SEM, EDS and FEA methods. The results showed that the failure of the stainless steel exhaust tube was due to stress corrosion cracking (SCC) caused by the combined action of Cl- and assemble stress.
中图分类号 TG172.9
所属栏目 失效分析
基金项目
收稿日期 2013/11/24
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备注姜勇(1974-), 副教授, 博士, 从事石化设备高温损伤、强度分析, 寿命评价及设备失效分析,
引用该论文: JIANG Yong,TANG Peng-jie,CHEN Jia-dong,GONG Jian-ming. Leakage Cause of a Boiler Water Cooling Wall Exhaust Tube[J]. Corrosion & Protection, 2014, 35(10): 1048
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参考文献
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【2】MARIANOA N A, SPINELLIB D. Stress corrosion cracking of stainless steel used in drill collars[J]. Materials Science and Engineering, 2004, 385(1/2): 212-219.
【3】CANSEVER N, CAKIR A F, URGEN M. New accelerated test for studying the susceptibility of stainless steels to chloride stress corrosion cracking under salt crust[J]. Corrosion Science, 1996, 38(11): 2043-2048.
【4】TRUMAN J E. The influence of chloride content, pH and temperature of test solution on the occurrence of stress corrosion cracking with austenitic stainless steel[J]. Corrosion Science, 1977, 17(9): 737-746.
【5】NISHIMURAA R, SULAIMANB A, MAEDAA Y. Stress corrosion cracking of austenitic stainless steel type 316 in acid solutions and intergranular SCC mechanism: Effects of anion species (Cl- and SO42- and sensitizing temperature)[J]. Environment-Induced Cracking of Materials, 2008, 1: 419-433.
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【7】吕国诚, 许淳淳, 程海东. 304不锈钢应力腐蚀的临界氯离子浓度[J]. 化工进展, 2008, 27(8): 1284-1287.
【8】WEN T T, MING S C. Stress corrosion cracking behavior of 2205 duplex stainless steel in concentrated NaCl solution[J]. Corrosion Science, 2000, 42(3): 545-559.
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