Effects of Cl concentration on the stress corrosion cracking behaviors of super 13Cr tubing steels were investigated in different concentration of NaCl solution, that tensile strength, elongation rate, cracking time, stress corrosion cracking susceptibility (kscc) and fracture morphology were analyzed by the experimental method of slow strain rate tension (SSRT) stress corrosion cracking (SCO, δε curves, scanning electron microscope (SEM), energy dispersive X-ray spectrometer (EDS) and X-ray diffraction (XRD). The results showed that the degree of stress corrosion was light at below 15% NaCl solution and was severe at the concentration above 25% NaCl solution. With Cl- concentration of solution increased, super 13Cr tubing steels mechanics properties reduced, SCC resistance properties reduced, the tendency of stress corrosion cracking increased, the stress corrosion cracking susceptibility kδ and kε both increased, and the increased tendency of kε were more obviously than kδ, effects of Cl- concentration on the plastic deformation of super 13Cr tubing steels were more significantly than tensile strength.%采用慢应变速率拉伸(SSRT)应力腐蚀开裂(SCC)的实验方法,通过应力应变(σ-ε)曲线、扫描电镜( SEM)、能谱分析(EDS)和X射线衍射分析(XRD)等手段分析了超级13Cr油管钢在NaCl溶液中的抗拉强度、延伸率、断裂时间、应力腐蚀开裂敏感性指数(kscc)和断口形貌,研究了Cl-浓度对其应力腐蚀开裂行为的影响.结果显示:当NaCl溶液浓度低于15％时,超级13Cr油管钢应力腐蚀的程度较轻,抗应力腐蚀开裂性能较好；而当NaCl溶液浓度大于25％时,其应力腐蚀的程度严重,抗应力腐蚀开裂性能较差；随溶液Cl-浓度的增大,超级13Cr油管钢的力学性能降低、抗SCC性能降低、应力腐蚀开裂的倾向增大、应力腐蚀开裂敏感性指数kσ和kε均呈现增大的趋势,且kε比kσ增大的趋势更明显；Cl浓度对超级13Cr油管钢塑性的影响比对其抗拉强度的影响更显著.
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