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Unexpected brittle failures of UNS NO5500 drill string parts and non-magnetic drill collars have recently been observed in cases where the UNS NO5500 components were galvanically coupled to carbon steel in concentrated salt solutions at temperatures between ambient and higher than 373 K. Cracking occured preferable at locations with a tri-axial stress condition (roots of threads) and has been ascribed to hydrogen embrittlement.
Recent results of sour gas and hydrogen embrittlement testing of CW N07022 alloy will be presented. The test results of CW N07022 alloy will demonstrate that it offers superior properties to precipitation-strengthened Ni-base alloys for demanding oil and gas applications.
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