高压纯氢环境对X80管线钢焊接接头氢脆敏感性的影响  

Influence of high-pressure pure hydrogen environment on hydrogen embrittlement susceptibility of X80 pipeline steel welded joints

作　　者：王鹏涛 崔崇 孙晨 鲁仰辉 刘伟 杨志文 WANG Pengtao;CUI Chong;SUN Chen;LU Yanghui;LIU Wei;YANG Zhiwen(SPIC Central Research Institute Co.,Ltd.,Beijing,China;Safetech Research Institute(Beijing)Co.,Ltd.,Beijing,China)

机构地区：[1]国家电投集团科学技术研究院有限公司 [2]安科工程技术研究院(北京)有限公司

出　　处：《石油与天然气化工》2025年第1期118-124,共7页Chemical engineering of oil & gas

基　　金：国家重点研发计划“纯氢与天然气掺氢长输管道输送及应用关键技术”(2022YFB4003400);国家电力投资集团有限公司科研项目“天然气管道长距离掺氢输送与终端应用关键技术研究”(KYB12022QN02)。

摘　　要：目的研究高压纯氢环境对X80管线钢焊接接头氢脆敏感性的影响,为天然气管道掺氢焊接工艺提供参考。方法采用冲击试验和慢应变速率拉伸试验,结合SEM断口分析及塑性指标计算,研究了6.3 MPa高压纯氢环境中X80管线钢焊接接头氢脆敏感性。结果(1)6.3 MPa纯氢环境下X80管线钢热影响区和焊缝的强度和塑性指标均有所下降,表现出一定的氢脆敏感性;(2)试样断口边缘出现脆性断裂的解理形貌,韧性断裂向脆性断裂转变;(3)塑性指标比值及延伸率下降率计算结果表明,相比于热影响区,6.3 MPa纯氢环境下焊缝的氢脆敏感性更高。结论在6.3 MPa高压纯氢环境中,X80管线钢焊接接头抗氢脆敏感性显著下降,断面收缩率、延伸率和抗拉强度均低于常压空气环境。Objective The study investigates the effect of high-pressure pure hydrogen environment on the hydrogen embrittlement susceptibility of X80 pipeline steel welded joints,providing a reference for the hydrogen blending welding process of natural gas pipelines.Method By employing impact tests and slow strain rate tensile tests,combined with SEM fracture analysis and plasticity index calculation,the hydrogen embrittlement susceptibility of X80 pipeline steel welded joints in a 6.3 MPa high-pressure pure hydrogen environment was investigated.Result Firstly,both the strength and plasticity index of the heat-affected zone and weld metal of X80 pipeline steel decreased in a 6.3 MPa pure hydrogen environment,demonstrating a certain susceptibility to hydrogen embrittlement.Secondly,the fracture surface of the specimens exhibited a transition from ductile to brittle fracture,characterized by cleavage facets along the fracture edges.Thirdly,calculation results of the plasticity index ratio and elongation reduction rate indicated that the weld metal exhibited higher hydrogen embrittlement susceptibility compared to the heat-affected zone in the 6.3 MPa pure hydrogen environment.Conclusion The susceptibility of welded joints of X80 pipeline steel to hydrogen embrittlement significantly decreases in a 6.3 MPa high-pressure pure hydrogen environment,with lower section shrinkage,elongation,and tensile strength compared to atmospheric air environment.

关 键 词：高压纯氢环境 X80管线钢 焊接接头 氢脆 冲击试验 拉伸试验 

分 类 号：TG1[金属学及工艺—金属学]