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Investigation of Hydrogen Embrittlement of High Strength Pipeline Steels Under Cathodic Protection

Pipeline steels higher than API X80 grade ad subject to hydrogen embrittlement risk induced by the hydrogen evolution effect under cathodic protection. This paper focuses on the hydrogen embrittlement behaviors of API X70, X80 and X90 high strength pipeline steel under cathodic protection in soil simulation conditions.

Product Number: 51317--9255-SG
ISBN: 9255 2017 CP
Author: Lei Zhang
Publication Date: 2017
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With the more widely application of pipeline steelshigher thanAPI X80 grade the hydrogen embrittlement risk induced by negative cathodic polarization and hydrogen evolution effect under cathodic protection has been recognized. Since the strengthening of pipeline steel might significantly increase the hydrogen cracking sensitivitymore understandings on the different criteria of cathodic protection potential or current density compared with those of traditional pipeline steels are requried. This paper focuses on the hydrogen embrittlement behavior of API X70 X80 and X90 high strength pipeline steel under cathodic protection in soil simulation conditions. The uptake and diffusion of hydrogen in the steels under different cathodic protection level were analyzed by hydrogen permeation test and hydrogen content measurement. Slow strain rate testing (SSRT) under cathodic conditions as well as mechanical performance degradation testing after long term immersion were employed to determine the hydrogen embrittlement (HE) susceptibilities of the three kinds of steel. The results showed the change of hydrogen diffusion rate hydrogen accumulated limit and hydrogen embrittlement factors with the increase of steel strength soil conditions and cathodic protection potential and current density.

With the more widely application of pipeline steelshigher thanAPI X80 grade the hydrogen embrittlement risk induced by negative cathodic polarization and hydrogen evolution effect under cathodic protection has been recognized. Since the strengthening of pipeline steel might significantly increase the hydrogen cracking sensitivitymore understandings on the different criteria of cathodic protection potential or current density compared with those of traditional pipeline steels are requried. This paper focuses on the hydrogen embrittlement behavior of API X70 X80 and X90 high strength pipeline steel under cathodic protection in soil simulation conditions. The uptake and diffusion of hydrogen in the steels under different cathodic protection level were analyzed by hydrogen permeation test and hydrogen content measurement. Slow strain rate testing (SSRT) under cathodic conditions as well as mechanical performance degradation testing after long term immersion were employed to determine the hydrogen embrittlement (HE) susceptibilities of the three kinds of steel. The results showed the change of hydrogen diffusion rate hydrogen accumulated limit and hydrogen embrittlement factors with the increase of steel strength soil conditions and cathodic protection potential and current density.

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