摘要
为研究天然气掺氢输送环境中气相杂质对管线钢的氢脆敏感性影响,本文通过缺口圆棒试样慢拉伸测试对比研究了正火态无缝钢管L245在空气和4 MPa氢气环境中的材料力学性能,对比研究4 MPa氢气环境中含H_(2)O,O_(2),CO_(2)等气相杂质时L245管线钢氢脆敏感性的变化,结合扫描电子显微镜对断口形貌进行了系统分析。结果表明:(1)相较于空气环境,4 MPa H_(2)环境下L245管线钢塑性有所降低,缺口试样的断裂方式为缺口边缘准解理断裂和中心部位韧断相结合,具有一定的氢脆敏感性;(2)H_(2)O的影响与其浓度有关,1‰及以下H_(2)O的加入对L245管线钢的氢脆敏感性影响较小,但H_(2)O浓度增大到10‰,L245氢脆敏感性明显增大;(3)4 MPa H_(2)+1‰H_(2)O环境下,1‰O_(2)的添加使得L245钢的氢脆敏感性程度明显降低;而1‰CO_(2)的添加使得L245钢的氢脆敏感性大幅增大。
In order to investigate the influence of gaseous impurities in natural gas-hydrogen mixtures on the hydrogen embrittlement susceptibility of pipeline steels,the mechanical properties of L245 pipeline steel under air and 4 MPa hydrogen environments were analyzed using slow tensile testing on notched round bar specimens in the present work.Furthermore,the changes in hydrogen embrittlement susceptibility of L245 pipeline steel were studied when exposed to 4 MPa hydrogen environment with various gaseous impurities such as H_(2)O,O_(2),CO_(2),etc.,and the fracture surfaces were systematically analyzed using Scanning Electron Microscopy.The results were as follows:1) Compared to air environment,L245 pipeline steel exhibited reduced plasticity under 4 MPa H_(2) environment,with a fracture mode characterized by a combination of quasi-cleavage fracture at the edge of the notch and ductile fracture at the center of sample,indicating certain degree of hydrogen embrittlement susceptibility;2) The effect of H_(2)O varied depending on its concentration.Addition of H_(2)O at or below 1‰ had minimal impact on the hydrogen embrittlement susceptibility of L245 pipeline steel.However,when H_(2)O concentration increased to 10‰,the sensitivity to hydrogen embrittlement significantly increased;3) Under an environment consisting of 4 MPa H_(2)+1‰H_(2)O,addition of O_(2) at a concentration level of 1‰ resulted in significant reduction in hydrogen embrittlement susceptibility for L245 steel.While addition of CO_(2) at a concentration level also at around 1‰ led to considerable increase in sensitivity to hydrogen embrittlement for L245 steel.
作者
魏仁超
杨志文
陈迎锋
王德强
王健
王修云
张雷
WEI Renchao;YANG Zhiwen;CHEN Yingfeng;WANG Deqiang;WANG Jian;WANG Xiuyun;ZHANG Lei(Safetech Research Institute(Beijing)Company Limited,Beijing 102209,China;Wuhai Kaijie Gas Company Limited,Wuhai 016000,Inner Mongolia,China;Institute of Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China)
出处
《力学与实践》
2025年第1期118-130,共13页
Mechanics in Engineering
基金
内蒙古自治区重大专项(2021ZD0038)资助。
关键词
管线钢
氢脆敏感性
气相杂质
氢气环境
pipeline steel
hydrogen embrittlement sensitivity
vapor phase impurity
hydrogen environment
作者简介
通讯作者:王修云,博士,正高级工程师,研究方向为管道材料氢脆、管道服役安全与失效预测、管道完整性管理等。E-mail:wxy@ankosri.com。
