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Case Study: These lines, which are operating in about 500 Completion Risers Joints for more than 3 years exposed to a mixture of seawater, mud, oil and eventually products of acidification in the annular space , have shown good performance except for an unusual case of cracking of the Nitronic stab.
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Rotary shouldered connections are commonly used in the oil and gas industry as the preferred connection method between drill string elements. A wide variety of materials are used in the drillstring make up, each with different properties and galling behavior. Non-magnetic austenitic stainless steel (AuSS) alloys are frequently used in measurement/logging-while-drilling (M/LWD) tools. CrMnN AuSS were commonly used to produce M/LWD tools and have decent galling resistance but are prone to failure due to stress corrosion cracking (SCC) during operation.