条形缺陷对L360管线钢环焊缝硫化物应力腐蚀开裂敏感性的影响  

Effect of Bar Defects on Sulfide Stress Corrosion Cracking Sensitivity of L360 Pipeline Steel Girth Weld

作　　者：王洪松[1] 冯大成 付安庆 苏航 吴明畏 赵果[1] 卓柯 WANG Hongsong;FENG Dacheng;FU Anqing;SU Hang;WU Mingwei;ZHAO Guo;ZHUO Ke(Puguang Branch of Sinopec Zhongyuan Oilfield,Dazhou,Sichuan 635000,China;State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials,CNPC Tubular Goods Research Institute,Xi′an,Shaanxi 710077,China;Xi′an Aude Petroleum Engineering Technology Co.Ltd.,Xi′an,Shaanxi 710000,China;Third Oil Production Plant of Changqing Oil Field Company,Yinchuan,Ningxia,750000,China)

机构地区：[1]中原油田普光分公司,四川达州635000 [2]中国石油集团工程材料研究院有限公司,油气钻采输送装备全国重点实验室,陕西西安710077 [3]西安奥德石油工程技术有限责任公司,陕西西安710018 [4]长庆油田分公司第三采油厂,宁夏银川750005

出　　处：《石油管材与仪器》2024年第1期87-92,共6页Petroleum Tubular Goods & Instruments

摘　　要：通过抗硫化物应力腐蚀试验、慢应变速率拉伸试验、氢含量测试等方法研究条形缺陷对H_(2)S环境下L360管线钢环焊缝硫化物应力腐蚀开裂敏感性的影响。结果表明,环焊缝在72%、85%和110%SMYS(最小屈服强度)应力水平下,热影响区出现裂纹且裂纹长度随加载应力增大而增大;条形缺陷环焊缝试样在屈服点后快速发生断裂,其断裂应变(0.024)仅为非缺陷环焊缝试样的21.05%;条形缺陷存在促进氢离子在裂纹尖端聚集从而加剧发生开裂倾向,消氢处理技术可以有效降低氢含量,降低环焊缝抗硫化物应力腐蚀开裂敏感性降低。The effect of bar defects on the stress corrosion cracking sensitivity of sulfide in L360 pipeline steel girth weld under H_(2S) environment was studied by anti-sulfide stress corrosion experiment,slow strain rate tensile experiment and hydrogen content test.The results show that cracks appear in the heat-affected zone of the girth weld at the stress levels of 72%,85% and 110% SMYS,and the crack length increases with the increase of the loading stress.The bar defected girth weld specimen breaks rapidly after the yield point,and its fracture strain(0.024) is only 21.05% of the non-defective girth weld specimen.The presence of bar defects promotes the aggregation of hydrogen ions at the crack tip,thereby aggravating the cracking tendency.The hydrogen elimination treatment can effectively reduce the hydrogen content and reduce the sensitivity of the girth weld to sulfur stress corrosion and cracking.

关 键 词：L360管线钢 条形缺陷 硫化物应力腐蚀试验 消氢处理 慢应变速率拉伸试验 

分 类 号：TG172[金属学及工艺—金属表面处理]