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96543 MOLTEN SALT ATTACK OF ALLOY 800H AND CAST STAINLESS STEEL SUPERHEATER COMPONENTS RESULTING FROM STEAM-SIDE CARRYOVER DEPOSITION

Product Number: 51300-96543-SG
ISBN: 96543 1996 CP
Author: Joseph P. Ribble, Mel J. Esmacher
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Three failure analyses involving iron-nickel-chromium alloys (Alloy 800H and niobium modified HP-40) in high temperature steam service 1300°F to 1450°F (704°C to 788°C) arc presented. Boiler water carryover conditions led to steam-side salt deposits containing sodium, chlorine, and sulfur species. The unique conditions of extremely high temperatures and localized accumulation of aggressive salt species resulted in component failures that involved a molten salt attack mechanism not typically observed in steam-side environments. Keywords: Alloy 800H, UNS No. NO8810, UNS No. N08811, Incoloy 800H, HP-40, HP-40Nb, niobium modified HP-40, molten salt attack, mixed molten salt attack, steam-side failures, iron-nickel-chromium alloys.
Three failure analyses involving iron-nickel-chromium alloys (Alloy 800H and niobium modified HP-40) in high temperature steam service 1300°F to 1450°F (704°C to 788°C) arc presented. Boiler water carryover conditions led to steam-side salt deposits containing sodium, chlorine, and sulfur species. The unique conditions of extremely high temperatures and localized accumulation of aggressive salt species resulted in component failures that involved a molten salt attack mechanism not typically observed in steam-side environments. Keywords: Alloy 800H, UNS No. NO8810, UNS No. N08811, Incoloy 800H, HP-40, HP-40Nb, niobium modified HP-40, molten salt attack, mixed molten salt attack, steam-side failures, iron-nickel-chromium alloys.
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