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 H2S–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.
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ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering
June 12–17, 2005
Halkidiki, Greece
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
0-7918-4197-9
PROCEEDINGS PAPER
Laboratory Investigation of Environmentally Induced Cracking of API-X70 and X80 Pipeline Steels
Kellen Rose de S. Lima,
Kellen Rose de S. Lima
EEIMVR-Fluminense Federal University, RJ, Brazil
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Ivani de S. Bott,
Ivani de S. Bott
Catholic University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
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Jose´ Antoˆnio da C. Ponciano Gomes
Jose´ Antoˆnio da C. Ponciano Gomes
PEMM/COPPE-Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
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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
Jose´ Antoˆnio 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
Published Online:
November 11, 2008
Citation
de S. Lima, KR, de S. Bott, I, & da C. Ponciano Gomes, JA. "Laboratory Investigation of Environmentally Induced Cracking of API-X70 and X80 Pipeline Steels." Proceedings of the 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. pp. 307-311. ASME. https://doi.org/10.1115/OMAE2005-67560
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