Effects of Typical Sour Natural Gas on Erosion and Corrosion Behavior of 16Mn Steel

Aiming at the corrosion of pipelines which transport typical sour natural gas (CO₂-H₂S-H₂O coexistence), the influence of CO₂ partial pressure, medium flow rate and H₂S content on the erosion and corrosion behavior of 16Mn steel was studied by simulation experiments. The results showed that H₂S would intensify corrosion, and the corrosion would increase greatly with the increase of its content. When the volume fraction of H₂S was ≥ 5%, the corrosion rate of 16Mn steel was more than 10 times that without H₂S. When the CO₂ partial pressure was 0.2 MPa, the critical flow rate was 10m/s. If flow rate was greater than the critical value, pitting would occur on the surface of 16Mn steel, and the degree of corrosion would increase significantly.