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In recent years, concern about reducing automotive body weight and improving crashworthiness has increased dramatically, encouraging active use of high-tensile steel sheets containing additive elements such as Mn and Si.1,2) To achieve excellent anti-corrosion properties, these hightensile steel sheets are used in galvanized components.3) In the manufacturing process of galvanized steel sheets, cold-rolled steel sheets are annealed in an atmosphere-controlled continuous furnace in order to reduce surface oxides of Fe and to recrystallize the steel sheet structures. The steel sheets are subsequently galvanized by immersion in molten zinc. The atmosphere of the continuous furnace usually contains N2 gas with a H2 content of around 10 vol% and a dew point of less than −20°C. The annealing temperature ranges from around 700°C to 900°C. Because Fe oxide can be reduced but both Si and Mn can be oxidized thermodynamically in this annealing atmosphere,4) Si and Mn are oxidized on the sheet surface. It is well known that these oxides of Si and Mn deteriorate the wettability of molten zinc on the surface of steel.5–8) It is also recognized that this selective surface oxidation behavior depends on the conditions of the annealing heat pattern such as the heating rate and Influence of Annealing Temperature and Dew Point on Kinetics of Mn External Oxidation