| TAO Shan,XU Yan-dong,DU Chun-chao.Cracking Sensibility of Super 13Cr Pipeline Steel in Environment with Low H2S and High CO2 Pressure[J],45(7):90-95 |
| Cracking Sensibility of Super 13Cr Pipeline Steel in Environment with Low H2S and High CO2 Pressure |
| Received:February 23, 2016 Revised:July 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.07.016 |
| KeyWord:super 13Cr low H2S and high CO2 environment stress corrosion cracking pitting corrosion temperature corrosion rate |
| Author | Institution |
| TAO Shan |
Research Institute of Petroleum Engineering, Sinopec Northwest Oilfield Company, Urumqi , China |
| XU Yan-dong |
Research Institute of Petroleum Engineering, Sinopec Northwest Oilfield Company, Urumqi , China |
| DU Chun-chao |
Research Institute of Petroleum Engineering, Sinopec Northwest Oilfield Company, Urumqi , China |
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| Abstract: |
| Objective Aimed at the service restrictions of super 13Cr-110 martensite stainless steel in standard IS15156 and the various viewpoints of its cracking condition, cracking sensibility of super 13Cr-110 martensite stainless steel at different temperatures and diverse low H2S partial pressures was studied. Methods The experiments of weight loss and three point bending test were carried out in the simulated corrosion environment based on acid oilfield containing low H2S and high CO2 in West China. High temperature and pressure autoclave was used during the test. Results The corrosion rate of super 13Cr-110 martensite stainless steel diminished with the decrease of temperature. It was 0.0031 mm/a at 80 ℃. Nevertheless, the stress corrosion cracking sensibility increased. The corrosion rate changed a little when H2S partial pressure rose from 6 kPa to 165 kPa at 210 ℃. Meanwhile, the cracking sensibility of super 13Cr-110 martensite stainless steel decreased. But fissures also appeared in long-term test. Conclusion Under low H2S partial pressure, the cracking type of super 13Cr-110 martensite stainless steel showed hydrogen embrittlement sulfide-stress cracking according to the analysis on the pattern of fissure and fracture. Firstly, local passive film was damaged and then pitting corrosion occured which led to the assembling of H. Finally, hydrogen embrittlement happened. With the H2S partial pressure lifting from 6 kPa to 165 kPa, the cracking sensibility of 13Cr-110 caused by pitting corrosion reduced due to the restraining of pitting corrosion. Super 13Cr-110 martensite stainless steel might not be applicable in the environment containing no more than 10 kPa H2S as recommended in the standard. |
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