| 摘要 |
<p>Galvannealed steel sheet and method, made by applying hot-dip galvanizing to a steel sheet, heating at a heating rate of at least about 10 DEG C/second to a maximum sheet temperature within a range of from about 470 to 550 DEG C, and applying an alloying treatment; the Al content XAl% in the hot-dip galvannealing layer and the coating weight W g/m<2> satisfy the following equation (1); thereby producing a Zn-Fe galvannealing layer having an iron content of from about 7 to 12%; the galvannealed steel sheet has intensities of zeta -phase, delta 1-phase and GAMMA -phase that satisfy the following equations (4) and (5) as observed through X-ray diffraction with the galvannealing layer peeled off the galvannealed steel sheet at the galvannealing/steel sheet interface, and the galvannealed steel sheet having excellent press workability, having a whiteness and a glossiness within prescribed ranges: <MATH></p> |
