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PROBLEM TO BE SOLVED : To provide a steel for a hot-dip galvanizing bath and a the hot-dip galvanizing bath. SOLUTION : The steel for the hot-dip galvanizing bath has a composition containing, by mass, 0.005 to 0.05% C, 0.005 to 0.25% Si, 0.1 to 1.1% Mn, =3.5% Cr.