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| STRESS CORROSION CRACKING OF X56 GRADE PIPELINE STEEL IN ATMOSPHERIC ENVIRONMENT CONTAINING H2S |
| ZHENG Chuanbo1;2;HUANGYanliang1;HUO Chunyong3;YU Qing1;2;ZHU Yongyan1;2 |
1.Institute of Oceanology;Chinese Academy of Sciences; Qingdao 266071
2.Graduate University of Chinese Academy of Sciences; Beijing 100039
3.Tubular Goods Research Center of China National Petroleum Corporation; Xi'an 710065 |
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Abstract Susceptibility to SCC of X56 grade pipeline steel was investigated by slow strain rate test (SSRT) and Devnathan-Stachurski double electrolytic cell in atmospheric environment containing H2S. The results showed that the fracture strain decreased while the strain rate decreased in the same H2S concentration environment. And the fracture strain decreased with increasing the concentration of H2S at the same strain rate 6.67x10-7 s-1. The SEM fractographs of the specimens also showed that the susceptibility to stress corrosion cracking (SCC) increased. The hydrogen permeation test showed that hydrogen permeation current did not increase with increasing the concentration of H2S in the first wet-dry cycle because of the formation of product film. The longer the experiment time, the more the hydrogen atom permeated through the specimen. This trend partially attribute to the surface coverage ratio (θ) of H2S and the corrosion product film.
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Received: 16 April 2007
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Corresponding Authors:
HUANGYanliang
E-mail: hyl@ms.qdio.ac.cn
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