Research on Hydrogen Embrittlement Behavior of X52 Pipeline Steel for Hydrogen Doped Natural Gas Transportation
Mixing hydrogen into existing natural gas pipelines in a certain proportion for large-scale long-distance transportation is one of the most efficient and economical ways for hydrogen energy storage and transportation.However,in hydrogen environments,pipeline steel may experience hydrogen embrittlement,leading to degradation of its mechanical properties and posing hidden dangers to the safe operation of pipelines.This paper,studies the hydrogen embrittlement behavior of X52 pipeline steel under different hydrogen pressure environment conditions,carries out the slow strain rate tensile testing and quasi-static fracture toughness test of X52 pipeline steel,and analyzes the influence of hydrogen doping ratio on the mechanical properties of pipeline steel in combination with fracture morphology.The results show that the total elongation after fracture of X52 pipeline steel decreases by less than 8％compared to a hydrogen free environment under the conditions of pipeline pressure of 7.5 MPa and hydrogen blending ratios of 3％,5％,and 10％.The fracture morphology shows that the main fracture morphology of the sample is ductile fracture,without typical brittle fracture morphology under the conditions of hydrogen blending ratio less than 10％.The degree of deterioration of X52 pipeline steel would increase with the increase of hydrogen content.
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维普
