[Introduction]The stress corrosion cracking behavior and mechanism of 2205 duplex stainless steel production tubing in oil and gas well containing H2S and CO2 were studied.[Method]Under the simulated working environment of oil and gas field,stress corrosion cracking tests were conducted at different temperatures and H2S partial pressures by slow tensile method and four-point bending method. The general corrosion rate was calculated by weight loss method,and the corrosion micromorphology and corrosion products were analyzed by scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS).[Result]When the H2S partial pressure was 0.10 MPa,2205 duplex stainless steel suffered from brittle fracture under stress corrosion condition,and its stress corrosion cracking sensitivity was highest at 25 ℃.[Conclusion]The increase of temperature and loading stress can accelerate the anodic dissolution rate,thereby the corrosion rate of 2205 duplex stainless steel increases.
duplex stainless steelstress corrosionpartial pressure of hydrogen sulfideanodic dissolution
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