针对牙哈气田复合钢管焊缝腐蚀穿孔情况对腐蚀部件进行分析。结果表明,复合钢管焊缝处的腐蚀穿孔是由于复合钢管内管与法兰焊缝处发生点蚀和应力腐蚀造成的。点腐蚀和应力腐蚀的发生和发展主要与焊接工艺、焊缝质量、焊缝材料、焊接应力和环境介质(Cl-含量)等因素有关。 Aiming at the corrosion and perforation of composite steel pipe weld in Yaha gas field, the corrosion components were analyzed. The results show that the corrosion perforation at the weld of composite steel pipe is caused by pitting corrosion and stress corrosion at the weld of pipe and flange in the composite steel pipe. The occurrence and development of pitting and stress corrosion are mainly related to the welding process, the quality of the weld, the material of the weld, the welding stress and the environment medium (Cl-content) and other factors.