Abstract
R39 AISI 1008 steel ring gasket, used as sealing element in choke valve of a gas well, suffered erosion–corrosion after being used for a relatively short time, which resulted in the leakage of gas. Scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, and hardness testing were used to determine the most probable causes of the failure. The results showed that the composition and hardness of ring gasket were in accordance with the required parameters of API 6A Style R39, Class D ring gasket, and AISI 1008 steel. The composition of corrosion products were mainly Fe2O3, Fe3O4 and scaling layer were composed of FeCO3. The investigations indicated that failure of the ring gasket was caused by erosion–corrosion.
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