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Laboratory Investigation of Environmentally Induced Cracking of API-X70 and X80 Pipeline Steels

[+] Author Affiliations
Kellen Rose de S. Lima

EEIMVR-Fluminense Federal University, RJ, Brazil

Ivani de S. Bott

Catholic University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil

José Antônio da C. Ponciano Gomes

PEMM/COPPE-Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil

Paper No. OMAE2005-67560, pp. 307-311; 5 pages
doi:10.1115/OMAE2005-67560
From:
  • ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering
  • 24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 3
  • Halkidiki, Greece, June 12–17, 2005
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 0-7918-4197-9 | eISBN: 0-7918-3759-9
  • Copyright © 2005 by ASME

abstract

Carbon steels, used in pipelines for the transport of oil and its derivatives, are frequently exposed to fluids. This can result in stress induced corrosion cracking (SCC) and/or hydrogen embrittlement (HE). The present paper evaluates the susceptibility of pipeline steels (API-X70 and API-X80) to SCC and HE, using a slow strain rate test (SSRT) based on the National Association of Corrosion Engineers’ (NACE) norm and a traditional standard NACE test. The (SSRT) method used, employed a sodium thiosulphate solution to evaluate susceptibility to HE, thereby offering a simpler experimental procedure than the standard NACE test. The results confirm the efficacy of the sodium thiosulphate as an H2 S–SCC susceptibility test solution when utilised in SSRT testing. Though no secondary cracks were detected in the materials investigated, both steels were observed to suffer a ductility loss upon exposure to this solution. In NACE type tests, the test pieces were subjected to constant loading at 80% of σy . Fracture did not occur for these samples.

Copyright © 2005 by ASME

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