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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.
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Fe-Cr-Ni alloys such as alloys 600 625 690 and 800 are used in steam generator tubing of nuclear power reactors. Precipitation of impurities on the steam generator tubing can lead to fouling and formation of deposits yielding a partially occluded metal surface. In this work the crevice corrosion susceptibility of these alloys is analyzed.