Patent ID: 8404358

Claim:
A galvannealed steel sheet comprising: a steel sheet; a galvannealed layer; and a Mn—P based oxide film, wherein: the steel sheet comprises C, Si, Mn, P, Al, and balance composed of Fe and inevitable impurities; a Zn—Fe alloy phase in the galvannealed layer is measured by X-ray diffractometry, wherein a value of a diffraction intensity Γ(2.59 Å) corresponding to an interplanar spacing of d=2.59 Å of Γ phase divided by a diffraction intensity δ 1 (2.13 Å) corresponding to an interplanar spacing of d=2.13 Å of δ 1 phase is less than or equal to 0.1, and a diffraction intensity ζ(1.26 Å) corresponding to an interplanar spacing of d=1.26 Å of phase divided by a diffraction intensity δ 1 (2.13 Å) corresponding to an interplanar spacing of d=2.13 Å of δ 1 phase is greater than or equal to 0.1 and less than or equal to 0.4; and the Mn—P based oxide film is formed using 5 to 100 mg/m 2 of Mn and 3 to 500 mg/m 2 of P on a surface of the galvannealed layer.