Experimental Research on Fatigue Properties of X80 Pipeline Steel for Synthetic Natural Gas Transmission

In recent years, many synthetic natural gas demonstration projects have been put into operation all over the world, and hydrogen is usually contained in synthetic natural gas. X80 is the most commonly used high-grade pipeline steel in the construction of natural gas pipelines. The compatibility betw...

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Bibliographic Details
Published inMathematical problems in engineering Vol. 2021; pp. 1 - 9
Main Authors Yan–hua, Li, Hui, Feng, Qiang, Chi, Fan, Fei, Xiong-xiong, Gao, Wei-wei, Li, Xiao-feng, Xu, Hong-yuan, Chen, Hua, Zhang
Format Journal Article
LanguageEnglish
Published New York Hindawi 27.01.2021
Hindawi Limited
Subjects
Arc welding
Base metal
Coal
Crack propagation
Fatigue failure
Fatigue life
Fracture mechanics
Gas pipelines
Gas transmission
Heat affected zone
Heat treating
High strength low alloy steels
Hydrogen
Mechanical properties
Metal fatigue
Natural gas
Nitrogen
Steel construction
Structural steels
Substitute natural gas
Welded pipes
China
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Summary:In recent years, many synthetic natural gas demonstration projects have been put into operation all over the world, and hydrogen is usually contained in synthetic natural gas. X80 is the most commonly used high-grade pipeline steel in the construction of natural gas pipelines. The compatibility between high-grade pipeline steel and hydrogen directly affects safety and reliability of long-distance pipelines. Therefore, in order to study the effect of hydrogen content on fatigue properties of high-grade pipeline steel, fatigue specimens were taken from base metal, spiral welds, and girth weld of submerged arc spiral welded pipes, respectively. Specifically, the total pressure was 12 MPa and hydrogen content was from 0 to 5vol%. Experimental results indicate that the hydrogen significantly increases the fatigue crack growth rate for both base metal, spiral weld, and heat-affected zone of X80 pipeline steel for about ten times compared with reference environment nitrogen, hydrogen would greatly reduce the fatigue life of the X80 pipeline steel, and the fatigue lifetime would decrease with the increase in hydrogen volume fraction. In order to ensure the safe operation of SNG pipeline, the hydrogen content should be controlled as low as possible.
ISSN:1024-123X
1563-5147
DOI:10.1155/2021/6631031