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Analysis of a UNS N08800 hydrogen unit preheat tube that failed in service. Based on chemical and metallographic analyses the failure was attributed to liquid metal embrittlement by zinc. The zinc source is thought to be the Cu/Zn catalyst for the low temperature shift converter located downstream of the preheat tubes.
A failure analysis was conducted on a 1½ inch diameter UNS N08800 hydrogen unit preheat tube that failed in service. Based on chemical and metallographic analyses the failure was attributed to liquid metal embrittlement by zinc. The zinc source is thought to be the Cu/Zn catalyst for the low temperature shift converter located downstream of the preheat tubes.
Keywords: Liquid metal corrosion, Liquid metal embrittlement, UNS N08800, zinc, hydrogen unit, furnace, heater
Transfer of Zn from hot-dipped and mechanically galvanized steel bolting to stainless steel by exposing a 304L stainless steel/Galvanized bolting assembly to temperatures in the range 205°C to 537°C for one hour to simulate an industrial fire scenario.
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This paper reports liquid metal embrittlement (LME) test results for a variety of common oilfield and processing plant alloys exposed to liquid mercuryp across a range of temperatures. Test methods used include slow strain rate testing and C-ring tests.