The galvannealed dual-phase steels are used in automotive applications. However, galvannealed coating is often exfoliated when it is in the pressing process. Galvannealed exfoliation is examined as a function of strain state using double reserve Olsen test to simulate forming process. Distances of punch in first and second reverse Olsen tests are changed to used to generate other strain state. The circle grids are etched on sheet to measure strain. Significant exfoliating is encountered in biaxial compress strain zone while no exfoliating occurred in biaxial tensile strain zone. Exfoliating is measured at specific locations and correlated with strains in those locations. An exfoliating map is generated in strain space.

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