| 摘要 |
PROBLEM TO BE SOLVED: To provide an alloy galvanized steel and its production method, in which alloy treatment is not degraded, even if Al density in a bath is raised for bottom dross depression.SOLUTION: The alloy galvanized steel includes: a steel plate including, less than 0.01% C, less than 0.08% Si, 0.05 to 1.5% Mn, less than 0.06% P, one or two kinds of 0.004 to 0.1% Ti and 0.004 to 0.1% Nb, 0.025 to 0.25% Ni, and the remainder Fe and impurity; and an ally galvanized plating layer located on a surface of the steel plate including Al of 0.20 to 0.5 mass% and Ni of 0.0005 g/m2 or more for each face and the remainder comprising Zn, Fe and impurity. A Ni content Ncg/m2 for each face satisfies the formula (1) for Al content Ac (mass%) of the alloy galvanized plating layer. Nc≥0.6*Ac2-0.25*Ac+0.033, formula(1).SELECTED DRAWING: Figure 2 |
