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UNS N08935 is a new versatile super austenitic alloy with extreme pitting resistance as indicated by its pitting resistance equivalent number (PREN) of 52. It can be used in a broader temperature range than superduplex and hyperduplex stainless steels, offers good weldability and is more cost-effective than Nickel-based materials which make the grade a good candidate for O&G applications, refineries, and chemical industries.1,2
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Use of corrosion inhibitors (CI) to protect metallic equipment, especially carbon steel pipelines from corrosion has long been an established, effective, economic, and hence globally accepted technique. The oil and gas industry has been using CIs to protect the pipelines under various exposure conditions including sour and sweet services . Complete understanding of corrosion mechanisms under sour conditions and protecting pipeline steel under such conditions has always been a challenging task due to the complexity of such systems.
The oil and gas industry is currently operating numerous fields that contain high concentrations of CO2 and H2S at elevated temperatures. Under such conditions, internal corrosion control has emerged as a significant challenge, leading to severe material failures in production wells and posing a substantial threat to oil and gas infrastructure.
Internal corrosion of pipelines represents a critical risk during the initial stages of production, with a reported occurrence of above 9,000 failures between 1990 and 2012.