Interstitial free steels produced by the addition of Ti and/or Nb to precipitate interstitial carbon and nitrogen atoms are galvannealed for automobile panels in the respects of their good corrosion resistance, weldability and paintability. An understanding of the phase evolution that takes place at the interface between liquid zinc and substrate steel is essential to obtain good quality of galvannealed coating. The microstructure of coating depends upon the substrate composition, grain size, texture and galvanizing conditions. In the present study, high strength interstitial free sheet steels containing Mn and P were galvannealed in an industrial CGL. The effect of strength hardening elements on the substrate texture as well as microstructural evolution of the zinc coating has been investigated by optical microscopy, scanning electron microscopy, transmission electron microscopy and electron back scattering diffraction techniques.