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Susceptibility of pipeline girth welds to hydrogen embrittlement and sulphide stress cracking

Authors

  • A. B. Forero,

    Corresponding author
    1. Materials Engineering Department, Pontifical Catholic University of Rio de Janeiro, Gávea Rio de Janeiro, RJ (Brazil)
    • Materials Engineering Department===, Pontifical Catholic University of Rio de Janeiro===, Rua Marquês de São Vicente 225===, Gávea Rio de Janeiro===RJ (Brazil)======

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  • J. A. C. Ponciano,

    1. COPPE, Department of Metallurgical and Materials Engineering, Corrosion Laboratory, Caixa Postal, CEP21941-972, Rio de Janeiro (Brazil)
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  • I. S. Bott

    1. Materials Engineering Department, Pontifical Catholic University of Rio de Janeiro, Gávea Rio de Janeiro, RJ (Brazil)
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Abstract

The susceptibility of girth welds to sulphide stress cracking (SSC) and hydrogen embrittlement (HE) were evaluated for API grade X80 and X56 steels, both for similar (X80/X80) and dissimilar (X80/X56) joints. Slow strain rate (SSR) and hydrogen permeation tests were performed at room temperature using sodium thiosulphate solutions at different pH levels. The SSR tests showed that the majority of the welded joints studied, though approved by the API 1104 standard's criteria, did in fact suffer a reduction in ductility and showed indications of susceptibility to sulphide stress cracking and to hydrogen embrittlement in the form of secondary longitudinal and internal transverse cracks. This was true regardless the welding process used.

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