摘要：采用了恒载荷拉伸试验方法，并通过浸泡试验、表面腐蚀形貌观察和断口形貌观察研究了不同拉应力大小对L80-1套管钢在模拟油田采出液环境中应力腐蚀行为的影响，并探讨了其应力腐蚀机制。研究结果表明，L80-1套管钢在模拟油田采出液环境中具有较高的应力腐蚀敏感性。随着拉应力增大，其腐蚀速率明显增大，延伸率明显降低；其中腐蚀速率的增大主要表现为点蚀形核数量增多，而非点蚀孔加深；随着拉应力增大，腐蚀形态趋于均匀腐蚀。L80-1套管钢在模拟油田采出液环境中的应力腐蚀机制以氢脆为主，兼具一定的阳极溶解机制特征。

　　关键词：拉应力，L80-1套管钢，模拟油田采出液，应力腐蚀

　　Effect of tensile stress on the stress corrosion behaviors of L80-1 casing steel in simulated oilfield producing water

　　Zhao Tianliang, Du Cuiwei, Liu Zhiyong, Li Xiaogang, Hu Jianpeng

　　（Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083）

　　Abstract:Constant tensile load method combined with immersion test and observation of surface corrosion morphology and tensile fracture morphology were performed to study effect of different tensile stress level on the stress corrosion cracking （SCC） behaviors of L80-1 casing steel in simulated oilfield producing water. Then its SCC mechanism was discussed. It is turned out that L80-1 shows great susceptibility toSCC in simulated oilfield producing water. The corrosion rate of L80-1 increasesand the ductility decreases by increasing the tensile stress level. The increasing corrosion rate is mainly causedby the increasing number of pitting nucleation not the deepening of pits,and corrosion form tend to be uniform corrosion gradually along with the tensile stress increasing. The SCC mechanism of L80-1 in the simulated oilfield producing water is mainly hydrogen embrittlement （HE） combined with supplementary anodic dissolution （AD）。

　　Keyword:tensile stress, L80-1 steel, simulated oilfield producing water, stress corrosion

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