Qualification of 6% Mo Stainless steel: Alignment with ISO 15156 - CANCELLED (C2026-00304)
CANCELLED
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Rudaina Raqmi, Mohammed Al Hubaishi, Main Al Hosni , Awadh Khayari, Rodoljub Mihajlov
Corrosion resistance alloys are widely used in the industry as a subsidy for Carbon steel exposed to higher corrosive environments. This study evaluates the pitting and corrosion behavior of Super austenitic stainless steels containing 6% molybdenum (6% Mo stainless steel such as UNS S31254) simulated for actual project operating conditions under two case scenarios. For the first case, the objective is to qualify the material currently operating beyond ISO 15156 limits; at temperatures up-to (200°C) and chloride concentrations of (1000 mg/l ), given CO2 mol% of 42.4% and partial partial pressure of H2S is 500kPa . The second case testing condition is in accordance with ISO 15156 limits; however exceeds the limits defined by PDO’s internal specifications. Therefore the objective is to qualify the current condition for organizational specification limits. The testing would be carried at a temperature of (100°C) and chloride concentrations of (30,000 mg/l ), given a CO2 mol% of 16% and partial partial pressure of H2S is 400kPa. Four point bend test (FPB) would be carried in accordance to NACE TM 0316 for triplicate samples collected from as -welded samples from a 12’’, 20’’ and 24’’ spools
