| ZHAO Jian,XIE Fei,GONG Ke,WANG Dan,WANG Xing-fa,ZHANG Ming-lun,WANG Yue.Stress Corrosion Cracking Behavior of X70 Pipeline Steel Under the Action of Sulfate Reducing Bacteria[J],46(10):108-114 |
| Stress Corrosion Cracking Behavior of X70 Pipeline Steel Under the Action of Sulfate Reducing Bacteria |
| Received:August 19, 2017 Revised:October 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.10.015 |
| KeyWord:X70 pipeline steel strain rate slow strain rate test sulfate reducing bacteria SEM AC impedance |
| Author | Institution |
| ZHAO Jian |
Key Laboratory of Oil & Gas Storage and Transportation, School of Petroleum Engineering, Liaoning Shihua University, Fushun , China |
| XIE Fei |
Key Laboratory of Oil & Gas Storage and Transportation, School of Petroleum Engineering, Liaoning Shihua University, Fushun , China |
| GONG Ke |
Key Laboratory of Oil & Gas Storage and Transportation, School of Petroleum Engineering, Liaoning Shihua University, Fushun , China |
| WANG Dan |
Key Laboratory of Oil & Gas Storage and Transportation, School of Petroleum Engineering, Liaoning Shihua University, Fushun , China |
| WANG Xing-fa |
Key Laboratory of Oil & Gas Storage and Transportation, School of Petroleum Engineering, Liaoning Shihua University, Fushun , China |
| ZHANG Ming-lun |
Key Laboratory of Oil & Gas Storage and Transportation, School of Petroleum Engineering, Liaoning Shihua University, Fushun , China |
| WANG Yue |
Key Laboratory of Oil & Gas Storage and Transportation, School of Petroleum Engineering, Liaoning Shihua University, Fushun , China |
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| Abstract: |
| Nowadays the problem of stress corrosion cracking of X70 steel in oil gas pipeline is increasingly serious, and the microbial corrosion in soil environment is attracting attention. Stress corrosion cracking law of high strength pipeline steel under the action of sulfate reducing bacteria was obtained by simulating corrosion of X70 pipeline steel in soil environment. Stress corrosion susceptibility of the material was analyzed by performing slow strain rate tensile test (SSRT) with self-made stress electrochemical test device. Fracture morphology and biofilm composition were studied by using AC impedance and scanning electron microscopy (SEM). When the strain rate was 5×10－7 s－1, the stress corrosion susceptibility of the sample in aseptic simulated solution was much greater than that in SRB simulated solution. The existence played a significant role in promoting stress corrosion of X70 pipeline steel. When the strain rate was 1×10－6 s－1, SRB had minor effect on the stress corrosion susceptibility of X70 pipeline steel. Mechanical factors mainly dominated the fracture while SRB played a helping role. X70 pipeline steel exhibits certain stress corrosion sensitivity in Shenyang soil simulation solution. SRB plays a certain role in promoting the stress corrosion of X70 pipeline steel in Shenyang soil simulation solution. |
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