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Hengyang, China

Lu X.-H.,Xian Shiyou University | Zhao G.-X.,Xian Shiyou University | Wang Y.,Xian Shiyou University | Zhang J.-B.,Xian Shiyou University | And 2 more authors.
Journal of Iron and Steel Research | Year: 2010

H2S/CO2 corrosion behaviors of 3Cr110S steel were studied with high temperature and high pressure and HjS stress corrosion cracking (SSC) test by use of scanning electron microscope (SEM), energy disperse spectroscopy (EDS), X-Ray diffraction (XRD) and transmission electron microscope (TEM). The results show. Under the simulated high temperature and high pressure HJS/COJ corrosion conditions, H2S electrochemical corrosion dominates the corrosion course, and the uniform corrosion rate of 3Cr110S steel is 0.1272mm/a, furthermore, the local corrosion is very slight. When the applied stress is 72% and 80% actual yield strength (AYS), all test specimens of 3Cr110S steel have not been found cracked which reveals the superior SSC resistance. The larger orientation difference between lath microstructures of 3Cr110S tempered sorbite micro-structure, granular carbide about Cr precipitating at the grain boundary or in crystal grain, dislocation tangle as well as dislocation pinning of the dispersion carbonide, all of those hinder severely SSC cracks to propagate. Source


Lu X.-H.,Xian Shiyou University | Zhao G.-X.,Xian Shiyou University | Wang Y.,Xian Shiyou University | Zhang J.-B.,Xian Shiyou University | Xie K.-Y.,Hengyang Valin MPM Co.
Cailiao Gongcheng/Journal of Materials Engineering | Year: 2011

H2S stress corrosion cracking (SSC) behavior of super 13Cr martensitic stainless steel at the simulated and standard environments has been studied with four-point bent test, electrochemical measurement as well as Scanning Electron Microscopy (SEM) analysis methods. The results show that the super 13Cr martensitic stainless steel behaves a high SSC susceptibility at the standard environments, and the cracks stem from surface corrosion pits because of the occurrence of H2S and Cl- making the pitting potential of super 13Cr martensitic stainless steel decreased significantly. While at the simulated environments, the SSC susceptibility of super 13Cr martensitic stainless steel decreased, and no cracks are found on the surface of the test specimen. Source


Lu X.-H.,Xian Shiyou University | Zhao G.-X.,Xian Shiyou University | Zhang J.-B.,Xian Shiyou University | Xie K.-Y.,Hengyang Valin MPM Co.
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2010

The corrosion behaviors of super 13Cr martensitic stainless steel were studied with high temperature and high pressure CO2 and H2S/CO2 test as well as electrochemical measurement at the simulated oilfield corrosion environment. The results show that with increasing temperature the uniform corrosion rate of super 13Cr martensitic stainless steel increases subsequently under CO2 corrosion environment, and the pitting is very slight. Under H2S/CO2 corrosion environment, the uniform corrosion rate of super 13Cr martensitic stainless steel changes little, but the pitting becomes severe. When the Cl- mass concentration is 160g·L-1, the max pitting depth comes to 28μm. The pitting potential of super 13Cr martensitic stainless steel is bigger than that of common 13Cr, and it decreases with increasing temperature and Cl- mass concentration as well as the presence of H2S, while it changes slightly in CO2 corrosion environment. The recovery potential of super 13Cr martensitic stainless steel is in the passivation zone under N2 and CO2 corrosion environment, and the higher recovery potential indicates that super 13Cr martensitic stainless steel possesses the superior re-passivation ability. At the same time, the presence of H2S makes the recovery potential and pitting potential decrease remarkably. Source

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