The effect on 22 Cr duplex stainless steel of coupling to carbon-steel in acid brine environments at 80 deg C has been evaluated. At low charging currents, hydrogen uptake was independent of pH and H2S and proportional to the square root of the charging current density. At higher charging currents, a critical value was reached above which hydrogen uptake was independent of the charging current density in H2S-free solution. In H2S environments, hydrogen uptake remained proportional to the square root of the charging current density and independent of the concentration of H2S. No significant reduction in the strain-to-failure relative to oil was observed in H2S-free environments. Pre-exposure for 50 days had only a modest effect on the strain-to-failure. In H2S environments, cracking may occur at coupling currents greater than 100 x 10-6 A/cm2.
Performance of duplex stainless steels in oilfield environments
1997
4 Seiten, 2 Bilder, 5 Quellen
Conference paper
English
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