| SUN Jian-bo,JIN Ya-peng,SUN Chong,JIANG Tao,CHENG Xiang-kun,LIU Hui-feng.Sulfide Stress Corrosion Cracking Behavior of Low-Cr Steel in H2S-CO2 Environment[J],45(2):1-7 |
| Sulfide Stress Corrosion Cracking Behavior of Low-Cr Steel in H2S-CO2 Environment |
| Received:October 31, 2015 Revised:February 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.02.001 |
| KeyWord:low-Cr steels H2 S-CO2 corrosion stress corrosion cracking 90SS steel 90SS-3Cr steel oil country tubular goods |
| Author | Institution |
| SUN Jian-bo |
China University of Petroleum Huadong, Qingdao , China |
| JIN Ya-peng |
China University of Petroleum Huadong, Qingdao , China |
| SUN Chong |
China University of Petroleum Huadong, Qingdao , China |
| JIANG Tao |
China University of Petroleum Huadong, Qingdao , China |
| CHENG Xiang-kun |
China University of Petroleum Huadong, Qingdao , China |
| LIU Hui-feng |
China University of Petroleum Huadong, Qingdao , China |
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| Abstract: |
| Objective To evaluate the sulfide stress corrosion cracking (SSCC) behavior of 90SS and 90SS-3Cr tube steels in H2S/ CO2 environment, and determine the fracture mechanism. Methods The SSCC behavior and fracture morphologies of 90SS and 90SS-3Cr tube steels in H2S/ CO2 environment were investigated by using four point bend test (FPB), slow strain rate test (SSRT), microstructure and scanning electron microscope (SEM) analysis. Results For 90SS-3Cr, more non-metallic inclusions appeared in the microscopic structure. After the FPB test for 720 hours, there were neither macroscopic nor microcosmic cracks on the surfaces of 90SS and 90SS-3Cr specimens, which meant that they possessed a favorable SSCC resistance. However, the SSRT tests indicated that as the concentration of H2S increased from 0 mol/ L to 6 mol/ L, the elongation, the reduction of cross section and the fracture time of 90SS-3Cr steel decreased by 71. 6% , 69. 6% and 61. 4% , which were much higher than that of 2. 9% , 52. 5% and 10. 3% of 90SS steel respectively. The fracture morphology analysis showed that the fracture of 90SS-3Cr steel transformed from ductile fracture into brittle fracture at lower H2S concentrations. Conclusion The SSCC resistance of both 90SS and 90SS-3Cr tube steels decreased with the rising of H2S concentration. 90SS-3Cr specimens were more prone to fracture than 90SS steel. |
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