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| EFFECT OF THE NONMETALLIC INCLUSIONS ON THE HIC BEHAVIOR OF X120 PIPELINE STEEL |
| ZHEN Fan1; LIU Jing1; HUANG Feng1; CHENG Jihao1; LI Cuiling1;GUO Bin2; XU Jinqiao2 |
1. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education; Wuhan University of Science and Technology; Wuhan 430081
2. Research Academy; Wuhan Iron and Steel Group Corporation; Wuhan 430080 |
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Abstract The ever-increasing demand for petroleum and natural gas, requires high strength pipeline steels for transportation. In the transporting process, the hydrogen induced cracking (HIC) on the pipeline steels in a H2S environment is the main reason to cause corrosion problems and technical problems. For this reason, it is necessary to study the HIC phenomenon in high strength pipeline steels. The HIC sensitivity，of the experimental X120 high strength pipeline steel was tested, the nonmetallic inclusions in the X120 pipeline steel was studied by using a multifunctional microscope, and the cracks formed by HIC were analyzed by SEM and EDS. The results show that the cracks usually initiate and extend at the boundaries between nonmetallic inclusions and the base metal, and connect with each other; long cracks are more easily formed near the B type inclusions than near the D type inclusions; larger contents of the S and Al in the X120 pipeline steel, higher grade of the inclusions, and larger amount of the nonmetallic inclusions, lead to higher HIC sensitivity.
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Received: 30 October 2009
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Corresponding Authors:
LIU Jing
E-mail: wkdliu@126.com
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