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Automotive industries strive to reduce the weight of car bodies in order to meet the regulation of CO2 emission per mileage. In addition the car bodies need to be crash worthy to meet passenger safety regulations. Advanced High Strength Steels (AHSS) have been developed to meet these requirements. Transformation Induced Plasticity (TRIP) and Dual Phase (DP) steels have increased in application in automotive parts but may be substituted by steels of even higher strength grades.1) Furthermore, more ultra-high strength components with strength over 1 GPa are expected to be applied in car bodies in the near future.1,2) One challenge to manufacturing automotive steel sheets is the ability to eliminate the imperfection in the Zn coating on the steel surface caused by surface oxides formed during the annealing process. The oxides interrupt the formation of the inhibition layer which forms between the molten Zn and steel surface.3,4) The inhibition layer is critical for controlling the coating thickness and if it is not formed uniformly could result in un-coated areas (so called bare spots) and irregularities in the Zn coating. Most of high strength steels for automotive application contain high levels of Al, Si and Mn and sometimes B for strength and toughness. Most of these additional elements are easily oxidized and form strong oxides on the steel surface that cause the aforementioned defects on the coating. Effect of Dew Point and Gas Flow Rate on the Surface Oxidation of Advanced High Strength Steels