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Effect Of Soil Environment On Hydrogen Embrittlement Behavior Of X60 Steel

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With the rapid development of China's economy, energy and transportation industries have developed rapidly, and more and more oil and gas pipelines and urban rail transit have been built and put into use. Urban rail transportation systems, such as subways or light rail, generally use direct current traction and backflow through the rail. Because the track is not completely insulated from the earth, it is inevitable that some electric current will be discharged from the track to the earth to form stray electric current, which will cause interference to the surrounding metal components such as buried oil and gas pipelines.

Product Number: 51322-17705-SG
Author: Wang Xiuyun, Yang Zhiwen, Wang Yao, Xing Yunying, Feng Min, Chen Yingfeng, Liu Xiaotong, Zhang Lei
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings and Linings , Coatings
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A negative disturbance simulation experiment of X60 steel was carried out in different soil environment. The influence of soil environment on the hydrogen embrittlement sensitivity of material was obtained by comparing the area shrinkage and elongation after fracture of pipeline substrate under different soil environment. The results show that the hydrogen embrittlement susceptibility of X60 steel in the soil of Tanglang Mountain increases with the negative shift of cathodic protection potential (the increase of cathodic current density). The hydrogen embrittlement susceptibility of X60 steel in the soil of Tanglang Mountain is less than 5% when the cathodic protection potential is less than -1.07 V vs. CSE (the current density is less than -0.1 mA/cm2). and the risk of hydrogen embrittlement is low; When the cathodic protection potential exceeds -1.1 V vs. CSE (current density exceeds -0.3 mA/cm2), the hydrogen embrittlement sensitivity coefficient exceeds 35%, and there is a certain risk of hydrogen embrittlement.

A negative disturbance simulation experiment of X60 steel was carried out in different soil environment. The influence of soil environment on the hydrogen embrittlement sensitivity of material was obtained by comparing the area shrinkage and elongation after fracture of pipeline substrate under different soil environment. The results show that the hydrogen embrittlement susceptibility of X60 steel in the soil of Tanglang Mountain increases with the negative shift of cathodic protection potential (the increase of cathodic current density). The hydrogen embrittlement susceptibility of X60 steel in the soil of Tanglang Mountain is less than 5% when the cathodic protection potential is less than -1.07 V vs. CSE (the current density is less than -0.1 mA/cm2). and the risk of hydrogen embrittlement is low; When the cathodic protection potential exceeds -1.1 V vs. CSE (current density exceeds -0.3 mA/cm2), the hydrogen embrittlement sensitivity coefficient exceeds 35%, and there is a certain risk of hydrogen embrittlement.

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