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The increasing demands for reducing fuel consumption and improving passenger safety have prompted automotive industries to develop advanced high-strength steels (AHSSs) for use in the structural parts of body-in-white (BIW). Among the currently developed AHSSs that contain various amounts of alloying elements, Mn, Si, and/or Al, transformation-induced plasticity (TRIP) steels possess combined properties of high strength and excellent formability, which are desirable for automotive applications [1]. The formable high-strength property of TRIP steels allows thinner-gauged sheets to be used in the BIW while maintaining the strength levels. However, to be used in automotive applications, the TRIP steels need corrosion protection, which is most effectively performed by means of a continuous hot-dip galvanizing process. In the continuous hot-dip galvanizing process, prior to hot dipping, cold-rolled TRIP steel sheets undergo an intercritical annealing in the ferrite-austenite two-phase temperature range to achieve a multi-phase microstructure with a fraction of retained austenite after the galvanizing process. Although intercritical annealing is typically performed under a reducing gas mixture of N2 and 5 – 10% H2 to protect the steel sheet surface from being oxidized, alloying elements with a high affinity for oxygen, such as Mn, Si and Al, are still enriched and selectively oxidized at the steel sheet surface, leading to poor galvanizability of the steel sheets during the subsequent hot-dip process [2-5]. Therefore, extensive work has been performed to suppress the external oxidation of the alloying elements in AHSSs during intercritical annealing by controlling the dew point (DP) and composition of the annealing gases [6-13]. Increasing the DP in the annealing furnace could promote the alloying elements to shift from undergoing external oxidation to internal oxidation, and thus improve the galvanizability of AHSS sheets. However, external oxidation of the alloying elements could not be completely suppressed because of their high oxygen affinities. Alternatively, the oxidation-reduction scheme is a method of creating a pure Fe layer on the AHSS sheets after the intercritical annealEffects of Oxygen Partial Pressure on Oxidation Behavior of CMnSi TRIP Steel in an Oxidation-Reduction Scheme