Modified ALLOY 28 (UNS N08028) with Improved Corrosion Properties in Sour Environments

摘要

Alloy 29 for use in oil country tubular goods (OCTG) has been evaluated in sour environments. Stress corrosion cracking ( SCC) tests were conducted in various environments containing H2S, CO2, chloride ions and elemental sulfur at temperatures between 140 and 160 °C. The results suggest that Alloy 29 is suitable for use in sour service, especially when high chloride concentrations or elemental sulfur are present. The results show that Alloy 29 is significantly more resistant to SCC in H2S environments than the limits for type 4c materials according to NACE standard MR0175