焊管2025，Vol.48Issue(2)：24-30,7.DOI:10.19291/j.cnki.1001-3938.2025.02.004
轴向拘束条件下X70管线钢残余应力释放超声法试验研究
Study on Ultrasonic Monitoring of Residual Stress of X70 Pipeline Steel under Axial Constraint Condition
摘要
Abstract
The manufacturing process of pipeline steel pipes involves multiple conditions of plastic strain and a complex distribution of residual stress.In order to better study the residual stress release law of long distance pipeline under axial constraint of high grade pipe line,considering the differences in hydraulic test standards at home and abroad.At the same time,the residual stress release law of high steel grade pipeline steel pipe under the conditions of multiple hydraulic tests and geological displacement after leaving the factory is further studied.The hydraulic test stress detection of X70 high grade pipeline is carried out through the hydraulic test platform,and the residual stress release law of pipeline after multiple hydraulic tests under axial constraint is analyzed.Residual stress before and after the pipeline hydraulic test was tracked by ultrasonic method,and the residual stress in the pipeline test cutting section was compared and verified by blind hole method,and the residual stress release rule of X70 pipeline under different strain combinations was obtained.Results show that the critical condition of residual stress release is the plastic deformation of the material,and the residual stress of the pipe body will not release with the increase of strain application times under the condition of elastic strain.Under strong axial constraint,the residual stress of X70 steel tube body does not release under the condition of the first plastic deformation,but after the second plastic deformation,the residual stress of X70 steel tube body is released obviously.The research results can provide an effective auxiliary technical method for the evaluation of oil and gas pipelines.关键词
油气管道/残余应力/超声法/应力释放/水压试验Key words
oil and gas pipelines/residual stress/ultrasonic method/stress release/hydrostatic test分类
能源科技引用本文复制引用
路浩,苗红钦,武刚,李丽锋,罗金恒..轴向拘束条件下X70管线钢残余应力释放超声法试验研究[J].焊管,2025,48(2):24-30,7.基金项目
国家管网西部管线公司资助项目"应力监测与残余应力测试"(项目编号0105/290020057). （项目编号0105/290020057）
