This study aims to understand the Sulfide Stress Cracking (SSC) resistance of API carbon steels exposed to wet sour environments containing CO₂. A mini-pipe specimen was cut from API grade tubulars and placed in an SSC test cell to perform the investigation. The specimen was highly strained and internally pressurized while exposed to the corrosive environment for seven days. The partial pressure ratio (PPR) of CO₂ (i.e. ratio of partial pressure of CO₂ to the total pressure) was varied to study the effect of CO₂ content on SSC. Experiments were performed while maintaining a constant H₂S concentration and temperature. The steels' variations in mechanical properties (ultimate tensile strength and plastic strain before failure) after exposure to the sour environment are used to quantify the embrittlement. In addition, the specimens were examined using optical microscopes to assess the severity of the SSC corrosion based on shear deformation patterns and crack features. The SSC resistance of the tested steels was minimized when the PPR of CO₂ was approximately 20%. Results demonstrate that the materials have adequate SSC corrosion resistance to be utilized in the environment containing 280 ppm H₂S. Nevertheless, their SSC resistance reduced noticeably between 10 and 30% PPR of CO₂.

本研究旨在了解API 碳钢暴露在含 CO _{2的潮湿酸性环境中的抗硫化物应力开裂 (SSC) 性能}。从 API 级管材上切下一个微型管样品，并放置在 SSC 测试单元中以进行研究。样品在腐蚀环境中暴露 7 天时受到高度应变和内部加压。_{改变CO 2}的分压比(PPR)（即CO ₂的分压与总压力的比）来研究CO ₂含量对SSC的影响。_{在保持恒定 H 2}的同时进行实验S 浓度和温度。暴露于酸性环境后钢的机械性能变化（最终抗拉强度和失效前的塑性应变）用于量化脆化。此外，使用光学显微镜检查试样，以根据剪切变形模式和裂纹特征评估 SSC 腐蚀的严重程度。_{当 CO 2}约为 20%时，测试钢的 SSC 阻力最小化。结果表明，这些材料具有足够的 SSC 耐腐蚀性，可用于含有 280 ppm H₂S 的环境中。然而，它们的 SSC 耐性显着降低了 10% 至 30% PPR 的 CO₂。