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03659 LIQUID METAL EMBRITTLEMENT OF ALLOY 800 HYDROGEN UNIT PREHEAT TUBES

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.

Product Number: 51300-03659-SG
ISBN: 03659 2003 CP
Author: D. W. Alley, D. J. Barker, M. W Mucek and S. A. Bradley
Publication Date: 2003
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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

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

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