Hydrogen Embrittlement Sensitivity of X80 Pipeline Steel Welded Joints in Hydrogen Environment

LI Tianlei, LI Ke, SHI Daiyan, FENG Min, YANG Zhiwen, CHEN Yingfeng, WANG Xiuyun, LIN Yuanhua, YU Zifeng

doi:10.16577/j.issn.1001-1560.2024.0081

Materials Protection >

2024 , Vol. 57 >Issue 4: 80 - 89

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0081

Hydrogen Embrittlement Sensitivity of X80 Pipeline Steel Welded Joints in Hydrogen Environment

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（1. Southwest Branch, China Petroleum Engineering Construction Co., Ltd., Chengdu 610041, China;
2. School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China;
3. Safetech Research Institute (Beijing) Co., Ltd., Beijing 102209, China;
4. National Petroleum and Natural Gas Pipeline Network Group Co., Ltd., Beijing 100000, China)

FENG Min (1993-), Master, Engineer, Research Focus: Hydrogen Embrittlement, Corrosion and Protection, Tel.: 18810062372, E-mail: fengm@ankosri.com

Received date: 2023-09-02

Revised date: 2023-11-04

Accepted date: 2023-12-04

Online published: 2024-04-30

Supported by

Inner Mongolia Autonomous Region Major Special Projects “Research and Development of Key Technologies for Medium and Low Pressure Pure Hydrogen and Hydrogen-Mixed Gas Pipeline Transmission and Its Application” (2021ZD0038)

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Abstract

In order to explore the changes in fracture mechanical properties of pipeline steel welded joints in hydrogen environment, the notched tensile in-situ hydrogen charging method was used to study the hydrogen embrittlement susceptibility of X80 steel base metal, welds and heat-affected zones under a total pressure of 12 MPa and a hydrogen partial pressure of 0.36 MPa. A high-pressure slow strain rate tensile testing machine was employed to conduct notch tensile test, and a high-pressure fracture toughness testing machine and a high-pressure corrosion fatigue testing machine were used to carry out fracture toughness and fatigue crack growth rate tests on X80 steel, respectively. The crack propagation behavior of X80 steel was studied by combining fracture toughness tests and fatigue crack propagation rate tests. Results showed that under the same conditions, compared with the base metal and heat-affected zone, the reduction of area at the weld position was significantly reduced, showing a higher susceptibility to hydrogen embrittlement. Compared with the original data in air at normal temperature and pressure, the crack tip opening displacement(CTOD) value of the weld position in the hydrogen partial pressure environment of 0.36 MPa changed slightly, and no secondary cracks appeared on the fracture surface. Compared with the air environment, the fatigue crack growth rate of X80 steel welds in a hydrogen partial pressure environment of 0.36 MPa increased by 1 order of magnitude, signifying that hydrogen could increase the fatigue crack growth rate of the material. However, according to the actual pipeline pressure fluctuation, the hydrogen embrittlement sensitivity of X80 steel was smaller under 0.36 MPa hydrogen partial pressure.

Key words： X80 pipeline steel; hydrogen; welded joints; hydrogen embrittlement; weld line

Cite this article

LI Tianlei, LI Ke, SHI Daiyan, FENG Min, YANG Zhiwen, CHEN Yingfeng, WANG Xiuyun, LIN Yuanhua, YU Zifeng . Hydrogen Embrittlement Sensitivity of X80 Pipeline Steel Welded Joints in Hydrogen Environment[J]. Materials Protection, 2024 , 57(4) : 80 -89 . DOI: 10.16577/j.issn.1001-1560.2024.0081

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