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Effect of Plastic Strain on Hydrogen Absorption of Low Alloy Carbon Steel for Linepipe

Picture for Effect of Plastic Strain on Hydrogen Absorption of Low Alloy Carbon Steel for Linepipe
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In the oil and gas industry, oil country tubular goods and linepipes are exposed to the wet H2S environment (sour environment) in some cases. The presence of H2S promotes hydrogen entry into steel due to the catalytic action of H2S. The absorbed hydrogen enhanced by H2S affects hydrogen embrittlement.

Product Number: 51323-19139-SG
Author: Taishi Fujishiro, Yusaku Tomio, Taro Muraki, Takuya Hara
Publication Date: 2023
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Hydrogen embrittlement, such as sulfide stress cracking, occurs in low-alloy carbon steels under sour environments. The amount of absorbed hydrogen increases with increasing plastic strain introduced into the steel materials. The susceptibility to hydrogen embrittlement increases with the strain introduction. However, even though various strains applied in various paths are introduced through pipe manufacturing processes, the effect of the strain path on hydrogen absorption behavior during operation has not been fully understood.


This paper describes the relationship between the strain path and hydrogen absorption behavior in the low-alloy carbon steel. Various type of strain paths consisting of tensile, compressive, and cyclic strains were applied to steel specimens. Hydrogen concentrations in these pre-strained specimens were compared after hydrogen was charged using an immersion test. The hydrogen concentration of the pre-strained steel did not correspond to the integrated amount of each applied strain, but to the maximum strain that was correlated with the maximum stress during the pre-strain introduction.

Hydrogen embrittlement, such as sulfide stress cracking, occurs in low-alloy carbon steels under sour environments. The amount of absorbed hydrogen increases with increasing plastic strain introduced into the steel materials. The susceptibility to hydrogen embrittlement increases with the strain introduction. However, even though various strains applied in various paths are introduced through pipe manufacturing processes, the effect of the strain path on hydrogen absorption behavior during operation has not been fully understood.


This paper describes the relationship between the strain path and hydrogen absorption behavior in the low-alloy carbon steel. Various type of strain paths consisting of tensile, compressive, and cyclic strains were applied to steel specimens. Hydrogen concentrations in these pre-strained specimens were compared after hydrogen was charged using an immersion test. The hydrogen concentration of the pre-strained steel did not correspond to the integrated amount of each applied strain, but to the maximum strain that was correlated with the maximum stress during the pre-strain introduction.

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