Abstract: Corrosion-resistant steel for chimney/flue use in natural gas-fired or liquefied petroleum gas-fired plants, containing C: 0.005% to 0.030%, Si: 0.18% to 0.50%, Mn: 1.50% to less than 3.00, P: 0.030% or less, S: 0.0050% or less, Cr: 4.0% to 9.0%, Al: 0.20% to 1.50%, and N: 0.020% or less and able to prevent advanced pitting or other localized corrosion and the resultant hole formation and rust aerial dispersal is provided.