C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 2/28 (2006.01) C23C 2/06 (2006.01)
Patent
CA 2290073
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°C/second to a maximum sheet temperature within a range of from about 470 to 550°C, and applying an alloying treatment; the Al content X Al% in the hot-dip galvannealing layer and the coating weight W g/m2 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 ~-phase, .delta.-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: ~ W x (X Al - 0.12) ~ 15 ............... (1) I(~: 1.26)/I(.delta.1: 2.13) ~ 0.02 ........... (4) I(.GAMMA.: 2.59)/I(.delta.1: 2.13) ~ 0.1 ........... (5).
Kato Chiaki
Tobiyama Yoichi
Jfe Steel Corporation
Kawasaki Steel Corporation
Moffat & Co.
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