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为预测分析20号碳钢湿气输送天然气管道未来的腐蚀速率,选取了具有代表性的采气管段进行了极端情况下金属的损伤积累速度的腐蚀检测。结果表明,管道输气量和水气比是激化腐蚀的主导因素,指出腐蚀速率会随着输气量和水气比的增大而提高,在输气量和水气比相近的情况下,腐蚀速率随H2S含量增加而升高;在靠近焊缝的母材中H2S容易诱发氢致裂纹和脆化,并且随着天然气中H2S含量增加,氢致裂纹的倾向会加大。此外,受冲刷腐蚀的影响,弯管处的腐蚀速率较高。
In order to predict and analyze the corrosion rate of natural gas pipeline of No. 20 carbon steel moisture transmission pipeline in the future, a representative gas-collecting pipe section was selected to detect the corrosion damage rate of metal in the extreme case. The results show that the gas transmission rate and the water vapor ratio are the main factors that lead to the intense corrosion. It is pointed out that the corrosion rate will increase with the increase of gas transmission rate and water vapor ratio. When gas transmission rate and water vapor ratio are similar, The corrosion rate increases with the increase of H2S content; H2S easily induces hydrogen induced cracking and embrittlement in the base metal close to the weld, and as the H2S content in natural gas increases, the tendency of hydrogen induced cracking increases. In addition, due to erosion erosion, elbow corrosion rate higher.