0

Full Content is available to subscribers

Subscribe/Learn More  >

Laboratory Evaluation of Soil Stress Corrosion Cracking and Hydrogen Embrittlement of API Grade Steels

[+] Author Affiliations
A. H. S. Bueno, B. B. Castro, J. A. C. Ponciano

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

Paper No. IPC2004-0284, pp. 2725-2730; 6 pages
doi:10.1115/IPC2004-0284
From:
  • 2004 International Pipeline Conference
  • 2004 International Pipeline Conference, Volumes 1, 2, and 3
  • Calgary, Alberta, Canada, October 4–8, 2004
  • Conference Sponsors: International Petroleum Technology Institute
  • ISBN: 0-7918-4176-6 | eISBN: 0-7918-3737-8
  • Copyright © 2004 by ASME

abstract

Stress corrosion cracking is one among several corrosion processes than can occur on buried pipelines. Efforts must be made in order to prevent this form of corrosion as long as pipeline collapse can cause accidents with high economic costs associated and environmental damage. In the present work, Stress Corrosion Cracking (SCC) and Hydrogen embrittlement (HE) of pipeline steels in contact with soil was investigated. Samples of different soils were obtained and prepared in order to determine its physical, chemical and bacteriological characteristics. Slow strain rate testing were carried out by using electrolytes obtained from soil samples extracted from different points located close to buried pipelines. Stress vs. strain curves of API X46, X60 and X80 steels were obtained at different electrode potentials (Ecorr , 100mV below Ecorr and 300mV below Ecorr ). The results obtained demonstrated the conjoint incidence of SCC and HE, depending on the potential imposed. These results revealed the SCC susceptibility of the steels. It was also observed that the hydrogen embrittlement — HE — has an important contribution to cracking initiation and propagation. Cracking morphology was similar to the SCC reported on field condition where transgranular cracking were detected in a pipeline collapsed by land creeping. It was important to point out that even under cathodic potentials the material showed the incidence of secondary cracking and a significant decreasing of ductility. The mechanism was similar to the one described by Parkins and coworkers to explain the incidence of stress corrosion cracking of carbon steel in near neutral soil.

Copyright © 2004 by ASME

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In