| HUANG Liang,LIU Zhi-yong,DU Cui-wei,LIU Ran-ke,WANG Bo,LI Yue-qiang,LI Xiao-gang.Stress Corrosion Cracking Failure of Q235B Steel Used for Sulfur-containing Waste Water Tank[J],44(3):52-56 |
| Stress Corrosion Cracking Failure of Q235B Steel Used for Sulfur-containing Waste Water Tank |
| Received:January 05, 2015 Revised:March 20, 2015 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2015.03.009 |
| KeyWord:Q235B steel sulfur-containing waste water tank H2 S SCC cracking |
| Author | Institution |
| HUANG Liang |
Corrosion and Protection Center, University of Science and Technology Beijing, Beijing , China |
| LIU Zhi-yong |
Corrosion and Protection Center, University of Science and Technology Beijing, Beijing , China |
| DU Cui-wei |
Corrosion and Protection Center, University of Science and Technology Beijing, Beijing , China |
| LIU Ran-ke |
Corrosion and Protection Center, University of Science and Technology Beijing, Beijing , China |
| WANG Bo |
Shijiazhuang Branch of China Petroleum & Chemical Corporation, Shijiazhuang , China |
| LI Yue-qiang |
Zhongke Jingchi Technology Ltd, Beijing , China |
| LI Xiao-gang |
Corrosion and Protection Center, University of Science and Technology Beijing, Beijing , China |
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| Abstract: |
| Objective Cause for corrosion crack failure of Q235B steel water tank served in a refinery was analyzed. Methods The macroscopic and microscopic behaviors of Q235B steel corrosion crack failure were characterized by means of macro-morphology, microstructure, fracture observation, chemical composition analysis and mechanical property analysis. Results In the humid atmosphere containing H2S formed at the top of the water tank, inter-granular stress corrosion cracks occurred for the Q235B steel. During the corrosion, micro-cracks were induced by permeation of the hydrogen generated by electrochemical reactions into the substrate. Meanwhile, the corrosion products accumulated on the surface of the substrate. Extremely large tensile stress was formed as a result of the combined effect of expansion of corrosion products and occlusion of the coating. Conclusion Combining stress analysis and environment analysis, the corrosion cracking failure mechanism of the Q235B steel sulfur-containing waste water tank was stress corrosion cracking induced by H2S, and the stress was derived from hydrogen permeation and the expansion of the corrosion products. |
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