Hydrogen embrittlement susceptibility of X70 pipeline steel weld under a low partial hydrogen environment

Effect of Electrochemical Hydrogen Charging Time on Hydrogen Embrittlement of the Hot-Rolled and Accelerated Cooling Treated API X70 Steel

“…2b, when the part constituting the band structure is observed with a scanning microscope, it can be seen that relatively coarse pearlite and fine AF are mixed together with PF. It can be seen that this microstructure is similar to previously reported microstructures [4,6,15,16]. 3 The stress-strain curves of the hot rolled and accelerated cooling treated API X70 steel held 0 h, 2 h, 4 h, and 10 h within electrolyte pot during electrochemical hydrogen charging method Fig.…”

“…Researchers have studied the hydrogen embrittlement of API linepipe steel and a test method to investigate the hydrogen embrittlement behavior [8][9][10][11][12][13], and also there are several research data on the effect of hydrogen content on the fracture behavior of API X70 steel [4][5][6][7][8][9][14][15][16][17]. In South Korea, POSCO (Pohang Steel Company) and Dongkuk Steel produce a certain amount of API X70 steel, but a few research papers on hydrogen embrittlement of API X70 steel using electrochemical hydrogen charging method were published worldwide [15,17].…”

Hydrogen Blending into Natural Gas Pipeline Infrastructure: Review of the State of Technology

“…It should be noted that Cerniauskas et al (2020) claim that pipes constructed of X70 can be suitable for operation with hydrogen because of the low susceptibility to hydrogen-induced subcritical crack growth at heat-affected zones and because fatigue crack propagation can be mitigated; however, other studies have found susceptibility of X70 to hydrogen embrittlement and cracking for both the weld (Nguyen et al 2020) and the parent material (Chandra et al 2021).…”

Finite element modeling of the hydrogen atom distribution on dented pipeline for hydrogen transport under cyclic loading

“…In the recent years, substantial attentions have been paid to pipeline HE problem. Compared with newly constructed pipelines, additional challenges exist when repurposing the existing natural gas pipelines to transport hydrogen blended with natural gas (Meng et al 2017;Nguyen et al 2020;Ronevich and San Marchi 2021). After a long time of service, the existing pipelines always contain various surface defects.…”

“…The effect of H atoms on mechanical properties of steels and the interaction between H and fatigue have been investigated in both aqueous and gaseous environments (Dmytrakh et al 2017;Slifka et al 2018;An et al 2019;Singh et al 2019). Tensile testing results obtained on H-charged pipeline steel specimens showed that H atoms did not influence the elastic modulus, yield stress and ultimate tensile strength of the steels (Briottet et al 2012;Nanninga et al 2012;Nguyen et al 2020). However, the steels' ductility was reduced more than 20% in terms of the reduction in area at fracture surface compared with the H-free specimens (Laureys et al 2022).…”