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In-situ 3D Analysis of Hydrogen Induced Cracking Behavior in Linepipe Steels to Investigate Sour Environmental Severity

Picture for In-situ 3D Analysis of Hydrogen Induced Cracking Behavior in Linepipe Steels to Investigate Sour Environmental Severity
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Product Number: 51321-16383-SG
Author: Kyono Yasuda/Taishi Fujishiro/Eiji Tada/Nobuyuki Ishikawa/Takuya Hara/Mitsuo Kimura/
Publication Date: 2021
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$20.00
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Hydrogen Induced Cracking (HIC) is a major issue of the linepipe exposed to sour environment. NACE MR0175 / ISO15156 classifies the severity of sour conditions as a function of pH and H2S partial pressure, based on Sulfide Stress Cracking (SSC) susceptibility of low carbon steel from experiments. Recently, the sour environmental severity diagrams for HIC and SSC were proposed based on the equal hydrogen concentration concept. From this concept, HIC behavior corresponds well with the steady-state hydrogen permeability, while SSC behavior is close related to the maximum hydrogen permeability. In this study, HIC behavior was closely investigated using the phased-array ultrasonic testing techniques to create three-dimensional (3D) images of cracks. HIC initiation and propagation behaviors were clearly visualized and investigated. It was found that HIC susceptibility was strongly affected by the hydrogen diffusion and corresponded with the steady value of hydrogen permeability.

Key words: sour environment, HIC, hydrogen permeability, in-situ, ultrasonic inspection, linepipe

Hydrogen Induced Cracking (HIC) is a major issue of the linepipe exposed to sour environment. NACE MR0175 / ISO15156 classifies the severity of sour conditions as a function of pH and H2S partial pressure, based on Sulfide Stress Cracking (SSC) susceptibility of low carbon steel from experiments. Recently, the sour environmental severity diagrams for HIC and SSC were proposed based on the equal hydrogen concentration concept. From this concept, HIC behavior corresponds well with the steady-state hydrogen permeability, while SSC behavior is close related to the maximum hydrogen permeability. In this study, HIC behavior was closely investigated using the phased-array ultrasonic testing techniques to create three-dimensional (3D) images of cracks. HIC initiation and propagation behaviors were clearly visualized and investigated. It was found that HIC susceptibility was strongly affected by the hydrogen diffusion and corresponded with the steady value of hydrogen permeability.

Key words: sour environment, HIC, hydrogen permeability, in-situ, ultrasonic inspection, linepipe

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