长周期临氢服役管材适应性评价  

Evaluation on pipeline steel adaptability for extended hydrogen-contacting service

作　　者：宁元星 刘翠伟[1] 李玉星[1] 宋明 张慧敏 陈曲儿 朱梦泽 彭世垚 陈俊文 NING Yuanxing;LIU Cuiwei;LI Yuxing;SONG Ming;ZHANG Huimin;CHEN Qu'er;ZHU Mengze;PENG Shiyao;CHEN Junwen(College of Pipeline and Civil Engineering,China University of Petroleum(East China)//Shandong Key Laboratory of Oil&Gas Storage and Transportation Safety;PipeChina Institute of Science and Technology;Southwest Branch of China Petroleum Engineering Construction Co.Ltd.)

机构地区：[1]中国石油大学(华东)储运与建筑工程学院·山东省油气储运安全重点实验室 [2]国家管网集团科学技术研究总院分公司 [3]中国石油工程建设有限公司西南分公司

出　　处：《油气储运》2024年第10期1118-1128,共11页Oil & Gas Storage and Transportation

基　　金：国家重点研发计划氢能技术专项“中低压纯氢与掺氢燃气管道输送及其应用关键技术”,2021YFB4001605。

摘　　要：【目的】随着氢能资源集中供给与市场需求的快速增长,利用长输管道实现大规模输氢因其可观的经济效益,成为未来氢能源供应的主要发展趋势。但在管道服役过程中,氢原子进入管线钢后可能诱发多种形式的氢损伤,从而导致管道失效,需评价长周期服役管材对氢的适用性。【方法】采用X射线衍射仪对服役管道内表面腐蚀产物进行分析,随后采用超声波与X射线数字成像对管段进行无损检测;结合电子背散射衍射分析,开展了气相原位氢渗透试验,探究服役管材中的氢渗透行为;最后开展了不同掺氢比条件下的慢应变速率拉伸试验与疲劳裂纹扩展试验,分析了氢对服役20钢拉伸及疲劳性能的影响。【结果】服役20钢内表面存在腐蚀,腐蚀产物成分主要为Fe_(2)O_(3)与Fe_(3)O_(4);由于服役管线压力波动较小,交变载荷作用不明显,服役管段未检测出缺陷波,无内表面裂纹或埋藏裂纹;晶粒尺寸较小,大角度晶界占比为91.7%,均匀分布的氢陷阱能够有效降低其氢脆敏感性。【结论】20钢在掺氢比为10%环境中的氢致脆化系数已超过25%,塑性性能明显劣化,大应力载荷条件下更容易发生氢致脆断,但其疲劳裂纹扩展速率在不同掺氢比环境中提升并不明显,且氢脆敏感性随掺氢比变化的敏感程度较低,在临氢环境中具有较好的抗疲劳性能。[Objective]The centralized supply of hydrogen resources and the rapid growth in market demand have made large-scale hydrogen transportation via long-distance pipelines a promising trend for future hydrogen energy supply,given its significant economic advantages.However,during pipeline operation,hydrogen atom permeation in pipeline steel may cause various forms of hydrogen-related damage,resulting in pipeline failure.Therefore,it is essential to evaluate the pipeline steel adaptability for extended hydrogen-contacting service.[Methods]An X-ray diffractometer was used to analyze corrosion products on the inner surface of the pipeline in service,followed by nondestructive testing using ultrasonic waves and digital X-ray imaging.The hydrogen permeation behavior was investigated through in-situ gas phase permeation tests combined with electron backscatter diffraction analysis.Finally,slow strain rate tensile tests and fatigue crack propagation tests were conducted at varying hydrogen blending ratios to assess the impact of hydrogen on the tensile and fatigue properties of 20 steel in service.[Results]Corrosion was observed on the inner surface of 20 steel in service,primarily consisting of iron oxide and ferroferric oxide.Due to minimal pressure fluctuations and the insignificant effect of alternating loads,no flaw waves were detected in the pipeline segment,and no internal surface or buried cracks were found.The grain size was small,with high-angle grain boundaries accounting for 91.7%.The uniformly distributed hydrogen traps effectively reduced the sensitivity to hydrogen embrittlement.[Conclusion]The hydrogen-induced embrittlement coefficient of 20 steel at a 10% hydrogen blending ratio exceeds 25%,indicating significant degradation of plasticity and a higher likelihood of embrittlement under high-stress loading conditions.However,the fatigue crack propagation rate remains largely unaffected across different hydrogen blending ratios,indicating low sensitivity of hydrogen embrittlement to the change of hydrogen blen

关 键 词：纯氢管道 长周期 适应性评价 20钢 大角度晶界 氢陷阱 

分 类 号：TE832[石油与天然气工程—油气储运工程]