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Evaluation of Hydrogen Embrittlement and Sulphide Film Formation in an API 5L X80 Steel Base Metal A

Most pipelines are exposed to severe operational conditions and sour environments that might lead to hydrogen entry in steels. The existence of weld joints directly affects the useful lifetime of these tubes acting as preferential areas for incidence of hydrogen embrittlement due to residual stressand microstructure. It is complex to evaluate the effects of the hydrogen induced cracking in weld joints owing to the different microstructures in the base metal heat affected zone and weld metal. There is a great concern to understand the influence of each region on crack propagation and iron sulphide film formation. This study investigates the behaviour of an API X80 steel base metal and weld joint in relation to hydrogen absorption in different concentrations of H2S. Slow strain rate tests and iron sulphide film analysis were conducted to determine the influence of each region of weld joint on the loss of ductility and protectiveness of the film. Particularly evaluating the reproducibility of tests in weld joints due to different regions of fracture and film formation. It was observed that the loss of ductility and the iron sulphide film morphology and barrier effect against hydrogen dependents on the weld joint fracture region.

Product Number: 51319-13404-SG
Author: Mariana Folena
Publication Date: 2019
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