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The UNS N09955 is a precipitation hardened Ni-alloy which exhibits a good combination of mechanical strength, ductility, toughness and resistance to hydrogen embrittlement
The UNS N09955 is a precipitation hardened Ni-alloy which exhibits a good combination of mechanical strength, ductility, toughness and resistance to hydrogen embrittlement and corrosion cracking with a microstructure in compliance with the stringent requirements of API 6ACRA. This makes the alloy very interesting for power generation applications as well as oil and gas applications, especially in high pressure and high temperature sour environments. In order to qualify the UNS N09955 alloy for such applications through its inclusion into the NACE MR0175/ISO 15156 document, an extensive test program has been implemented in order to evaluate UNS N09955 resistance to both primary cracking mechanisms (stress corrosion cracking and galvanically induced hydrogen stress cracking) and possible secondary cracking mechanisms (sulphide stress cracking) in H2S service. Details and results of this test program are presented and discussed in this paper.
Key words: downloadable, UNS N09955, SCC, SSC, GHSC, corrosion resistance, Ni-alloys
In this study, the MIC resistance behavior of a 2205 Cu-bearing antibacterial duplex stainless steel (2205 Cu-DSS) in the presence of marine corrosive bacteria Pseudomonas aeruginosa was investigated. Electrochemistry evaluation, surface observation, corrosion product analysis were applied.
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Oxidation behavior of a commercial, cast Ni-base superalloy was studied in air-SO2 mixture, simulating combustion gases from high sulfur containing fuels. Experiments at 1050°C for up to 500 hours duration. The studied alloy was characterized with a number of analytical methods including SEM / EDX and GDOES after different oxidation times.
We describe the advancement of an activity-based quantitative polymerase chain reaction (qPCR) assay which can distinguish live from dead corrosion influencing microorganisms in oil and gas pipeline environments. We discuss the limitations and possible future optimization methods for Propidium monazide-qPCR techniques in the industry.