掺氢天然气环境中X70管线钢及其焊缝适应性研究

吴华; 班久庆; 罗寅午; 冯敏

doi:10.3969/j.issn.1007-3426.2025.05.017

掺氢天然气环境中X70管线钢及其焊缝适应性研究

Adaptability of X70 pipeline steel and its welds in hydrogen-blended natural gas environment

摘要

摘要:
目的研究X70管线钢及其焊缝在掺氢天然气环境中的力学性能变化规律，评估其适应性。
方法在总压4 MPa、氢气体积分数为10%的混合天然气环境中，对X70管线钢及其焊缝进行冲击韧性测试、慢应变速率拉伸测试以及疲劳裂纹扩展速率测试。
结果与纯天然气环境相比，掺氢天然气环境中X70管线钢和焊缝的拉伸强度、塑性和冲击性能没有明显降低，而疲劳裂纹扩展速率增加约一个数量级。
结论 X70管线钢及其焊缝在掺氢天然气环境下存在氢脆风险。

Abstract:
Objective The aim is to study the change laws in mechanical properties of X70 pipeline steel and its welds in hydrogen-containing environments for natural gas pipelines, and determine their adaptability in hydrogen-blended natural gas environments.
Method Toughness testing, slow strain rate tensile testing, and fatigue crack propagation rate testing were conducted on X70 pipeline steel and its welds in a mixed natural gas transportation environment with a total pressure of 4 MPa and 10% hydrogen gas. Its adaptability was determined through comparative analysis of mechanical property changes.
Result Compared with a pure natural gas environment, in a hydrogen-blended natural gas environment, the tensile strength, plasticity, and impact performance of X70 pipeline steel and welds did not significantly decrease, while the fatigue crack propagation rate increased by about an order of magnitude.
Conclusion X70 pipeline steel may have a hydrogen embrittlement risk in a hydrogen-blended natural gas environment.

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