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Ferritic alloys containing Cr form Cr5S6 precipitates along grain boundaries in hot SO2 environment. Grain boundary precipitates may influence the steel’s mechanical behavior. Cr5S6 precipitates were reconstructed three-dimensionally using FIB tomography analysis to determine the volume, number, and penetration depth. The volume growth of Cr5S6 precipitates increased only for the initial aging time of 3 h but became constant after 6 h. The number of precipitates increased linearly.