SYMPOSIA PAPER Published: 01 January 1976
STP41399S

Galvanic Coupling of Some Stressed Stainless Steels to Dissimilar Metals Underground

Source

Stainless steels, Type 301 half hard and Type 301 full hard, have been found susceptible to failure by hydrogen embrittlement when stressed as low as 40 percent of their yield strength and cathodically charged above 1 μA/cm2 by galvanic coupling to a dissimilar metal in four years of exposure at six underground test sites. However, stainless steels Type 304 and alloys 26Cr-1Mo and 26Cr-6.5Ni were resistant under similar conditions. Failures by stress-corrosion cracking were not observed in any of the materials. Electrochemical measurements made periodically above ground are correlated with the subsequent visual examination of the specimens.

Author Information

Escalante, E.
Institute for Materials Research, National Bureau of Standards, Washington, D. C.
Gerhold, W., F.
Institute for Materials Research, National Bureau of Standards, Washington, D. C.
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Details
Developed by Committee: G01
Pages: 81–93
DOI: 10.1520/STP41399S
ISBN-EB: 978-0-8031-6045-3
ISBN-13: 978-0-8031-6199-3