温度对超级13Cr油管钢慢拉伸应力腐蚀开裂的影响

采用慢应变速率拉伸(SSRT)应力腐蚀开裂试验方法,通过σ-ε曲线和SEM等分析了超级13Cr油管钢抗拉强度、延伸率、断裂时间、应力腐蚀开裂敏感性指数(kscc)和断口形貌;研究了温度对其在3.5%NaCl溶液中应力腐蚀开裂(SCC)的影响。结果表明:当温度<60℃时应力腐蚀的程度较轻;当温度>80℃时应力腐蚀的程度严重;随温度的升高,超级13Cr油管钢的抗拉强度降低,延伸率减小,断面收缩率减小,断裂时间减小,应力腐蚀开裂的倾向性增大,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增大的趋势更显著;温度对超级13Cr油管钢的塑性变形性的影响比对抗拉强度的影响更大。

Effects of Temperature on the Slow Strain Rate Tension Stress Corrosion Cracking of Super 13Cr Tubing Steel

Effects of temperature on the stress corrosion cracking of super 13Cr tubing steel were investigated in 3.5 % NaCl,that tensile strength and elongation and cracking time and stress cor-rosion cracking susceptibility index kscc and fracture morphology were analyzed by slow strain rate tensile stress corrosion cracking （SSRT） experiment method and ms curve and SEM. the re-sults shows that the degree of stress corrosion were lesser at below 60 ℃and were severe at high-er 80 ℃. With the rise of temperature,the super 13Cr tubing steel tensile strength decreased, e-longation rate decreased, contraction ratio decreases, breaking time was reduced, stress corrosion cracking tendency of increase, the stress corrosion cracking susceptibility index kσ and kε are in-creasing, and the increased trend of kε were obviously than kσ, effects of temperature on the plastic deformation of super 13Cr tubing steel were greater than the tensile strength.