Session: Advances in Materials for Oil and Gas Production (Part III of III)
Evaluation of Steel UNS S32750 Localized Corrosion and SCC Resistance under Simulated Field Conditions (C2026-00370)
Tuesday, March 17, 2026
3:00 PM - 3:30 PM Central
Location: 362 DE
Earn .5 PDH
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This study examines corrosion and cracking behavior of a superduplex stainless steel, which is known for its excellent mechanical properties and outstanding corrosion performance in harsh environments. The test program evaluates the susceptibility of UNS S32750 steel to localized corrosion and stress corrosion cracking (SCC) under simulated field conditions (H2S and CO2 contaminants), through laboratory testing of specimens in autoclaves. Tests were conducted at high temperatures of 120°C and 140°C, with a pH of 4.3, following the ASTM G61 and NACE TM0177 standards, and included extended exposure periods of up to 60 days under applied stress. These conditions mimic the challenging environments found in FPSO topsides applications, providing insights into the material's performance under stress. Both base metal and welded joints of UNS S32750 were tested, ensuring a thorough assessment. Results showed that UNS S32750, when manufactured according to industry standards, demonstrates significant resistance to pitting corrosion and SCC, confirming its reliability in demanding applications. This underscores the importance of adhering to industry standards for optimal performance. The study concludes that UNS S32750 steel is suitable for applications requiring durability and reliability in harsh conditions, contributing valuable data to the development of corrosion-resistant materials in the oil and gas sector.
