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Keywords: Valve Stem
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Proceedings Papers

...-P coating would not perform well in valve stem service. The damage mechanism with aeration was not well defined as by 13 weeks (the first coupon removal time), the Ni-P coating was entirely corroded and thick voluminous corrosion products rich in iron were observed. Although accelerated localized...
Proceedings Papers

...Abstract A case history of sulphide stress cracking of UNS S17400 (17-4 PH) stainless steel valve stems will be presented. Even though the valve stems met the requirements of NACE Standard MR0175-84, failures still occurred. The valves were used in a wet sour gas environment that contained 27...