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51315-5660-Effect of Alloy Element on Hydrogen Entry of Low Alloy Carbon Steel in Sour Conditions

Picture for Effect of Alloy Element on Hydrogen Entry of Low Alloy Carbon Steel in Sour Conditions
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Product Number: 51315-5660-SG
ISBN: 5660 2015 CP
Author: Daisuke Mizuno
Publication Date: 2015
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Hydrogen Induced Cracking (HIC) is a major issue of line pipe steels exposed to sour environments. Enormous efforts in research and production have been done by steel makers to improve HIC resistance. It is widely recognized that adding copper is effective to decrease HIC susceptiblity in mildly sour environments with high solution pH (normally more than 5.0). However the mechanism of remarkable Cu effect and role of other elements on HIC resistance have not been fully clarified. In this study hydrogen permeation testing was conducted in sour conditions using Devanathan type cell and the effect of alloy elements such as Cu and Mo on HIC resistance was investigated by comparing hydrogen permeation behaviors. Corrosion product formed on surface was also investigaed to analyze its structure and element distribution. From these experiments it was found that alloy composition strongly affected hydrogen permeation rate in mildly sour conditions. Mechanism of hydrogen entry influenced by alloy composition also will be discussed in this paper.
Hydrogen Induced Cracking (HIC) is a major issue of line pipe steels exposed to sour environments. Enormous efforts in research and production have been done by steel makers to improve HIC resistance. It is widely recognized that adding copper is effective to decrease HIC susceptiblity in mildly sour environments with high solution pH (normally more than 5.0). However the mechanism of remarkable Cu effect and role of other elements on HIC resistance have not been fully clarified. In this study hydrogen permeation testing was conducted in sour conditions using Devanathan type cell and the effect of alloy elements such as Cu and Mo on HIC resistance was investigated by comparing hydrogen permeation behaviors. Corrosion product formed on surface was also investigaed to analyze its structure and element distribution. From these experiments it was found that alloy composition strongly affected hydrogen permeation rate in mildly sour conditions. Mechanism of hydrogen entry influenced by alloy composition also will be discussed in this paper.
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