低C中Cr钢在外加应力下的耐蚀性能研究  

Study on the Corrosion Resistance of Low C Medium Cr Steel under Applied Stress

作　　者：肖大恒[1] 高擎 武会宾[2] 周文浩 张青学 王红涛 吴仲文 XIAO Daheng;GAO Qing;WU Huibin;ZHOU Wenhao;ZHANG Qingxue;WANG Hongtao;WU Zhongwen(Xiangtan Iron and Steel Group Co.,Ltd.,Xiangtan 411101,China;University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]湘潭钢铁集团有限公司,湖南湘潭411101 [2]北京科技大学,北京100083

出　　处：《金属材料与冶金工程》2023年第3期9-13,共5页Metal Materials and Metallurgy Engineering

基　　金：湖南省青年科技人才项目(2022RC1068)。

摘　　要：二氧化碳驱油技术是一种高效的采油技术,针对CO_(2)驱用中Cr钢管制备过程中产生的残余应力,使用三点弯曲法对试验钢预加应力,利用高温高压反应釜模拟CO_(2)驱环境加速腐蚀,通过腐蚀速率对比,结合腐蚀形貌微观表征,研究外加应力、应变对中Cr钢在模拟CO_(2)驱环境中的耐蚀性能影响。开发的低C中Cr钢在模拟CO_(2)驱集输环境中难以发生应力腐蚀开裂。腐蚀速率随着预加应力的增大略有增加,应力达到屈服强度附近时垂直于拉应力方向链状和断带状分布的局部腐蚀是引起腐蚀速率增加的原因,但该局部腐蚀难以扩展,不足以引发应力腐蚀开裂。Recently,it is an efficient oil recovery technology for carbon dioxide oil displacement technology.In response to the residual stress generated during the manufacturing of Cr steel pipes used for CO_(2) flooding,a high-temperature and high-pressure reactor was utilized to simulate the accelerated corrosion in CO_(2) flooding environments under the applied prestress by a three-point bending method.Then,combining the corrosion rate and the microscopic characterization of corrosion morphology,the effect of external stress and strain on the corrosion resistance of medium Cr steel was studied in a simulated CO_(2) flooding environment.The experimental results show that the developed low C medium Cr steel is difficult to produce stress corrosion cracking in the simulated CO_(2) driving and gathering environment.Furthermore,the corrosion rate increases slightly with the increased prestress.When the prestress reaches near the yield strength,the local corrosion distributed vertically to the tensile stress direction is the cause of the increased corrosion rate,which it is difficult for the local corrosion to expand and cause stress corrosion cracking capably.

关 键 词：CO_(2)驱 中Cr钢 外加应力 耐蚀性能 

分 类 号：TG142[一般工业技术—材料科学与工程]