天然气掺氢对X52M管材和焊缝力学性能指标影响研究

STUDY ON X52M PIPELINE AND WELD MECHANICAL PROPERTIES IN HYDROGEN-NATURAL GAS PIPELINE TRANSPORTATION

  • 摘要: 本文在总压6.3 MPa、30%掺氢环境,对X52M母材和环焊缝开展慢应变速率拉伸、断裂韧性、和气相氢渗透测试,分析试验钢在掺氢环境的性能退化情况。结果表明,在总压6.3 MPa掺氢比30%环境下,试验钢母材和环焊缝的各项力学性能较空气环境均有所降低;通过分析不同力学性能指标对氢的敏感程度,建议采用缺口抗拉强度损失和韧性区面积占比,结合断裂韧性特征值,评价管材在掺氢环境的适用性。

     

    Abstract: In this paper, by simulating a hydrogen doped environment with a total pressure of 6.3 MPa and 30%, slow strain rate tensile, fracture toughness and gas phase hydrogen penetration tests were carried out on the X52M base metal and girl-weld, and the performance degradation of the test steel in a hydrogen doped environment was analyzed. The results show that the mechanical properties of the test steel base metal and girth weld are lower than those in the air environment at a total pressure of 6.3 MPa and a hydrogen ratio of 30%. By analyzing the sensitivity of different mechanical properties to hydrogen, it is suggested that notched tensile strength loss and the area proportion of toughness area, combined with the crack tip opening displacement, evaluate the applicability of pipe in hydrogen doped environment.

     

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