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Measurement of Sustained-Load Cracking Thresholds for Steels in Hydrogen Delivery and Storage

[+] Author Affiliations
K. A. Nibur, B. P. Somerday, C. San Marchi, D. K. Balch

Sandia National Laboratories, Livermore, CA

Paper No. PVP2008-61298, pp. 201-210; 10 pages
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 6: Materials and Fabrication, Parts A and B
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4829-6
  • Copyright © 2008 by ASME


Threshold stress intensity factors at crack arrest have been measured for three commercial low alloy pressure vessel steels, SA372 grade J, DOT 3AAX and DOT 3T as well as X100 line pipe steel using sustained load testing. Testing conditions were consistent with the recently published Article KD-10 from Section VIII, Division 3 of the ASME Boiler and Pressure Vessel Code. Measured threshold values for these steels suggest a higher resistance to hydrogen-assisted fracture than previously expected, however some improvements to the methodology of Article KD-10 may be required to ensure conservative results are measured. Specifically, conservative measurements of threshold stress intensity factor for hydrogen-assisted fracture cannot be determined without crack propagation.

Copyright © 2008 by ASME



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