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SP&S #273
Astoria RR
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Annealing the Flues
Wednesday, August 28, 2024Swedging the flue tubes to reduce the end diameter at the fire box tube sheet work hardened the steel. In order to make sure that the ends of the flues do not crack when they are rolled into the tube sheet, we annealed them by heating the ends red hot then allowing them to cool slowly (wrapped in an insulation blanket).
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