| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a galvanized steel sheet which has beautiful surface appearance and excellent plating adhesiveness. SOLUTION: A steel sheet containing 0.1-3.0 mass% Si is used as a base steel sheet. After a compound containing at least one kind of specified element to be selected from the specified element group consisting of Cl, C, S, P, F and B is deposited on the surface of the steel sheet, an iron oxide layer is formed on the surface of the steel sheet by performing oxidation processing for heating the steel sheet under the condition that the temperature rising rate is≥5°C/s, and the maximum reachable temperature of the steel sheet is >500°C so that≥50 mass% of the specified element to the deposition remains in the galvanized steel sheet, and the reduction processing is performed thereafter, and followed by the galvanizing. Any damage of an equipment in a heating furnace or any pollution of the external environment hardly occurs, any surface flaw such as non-plating is not present, the beautiful surface appearance is present, and the plating adhesiveness is excellent. Such galvanized steel sheets, and hot-dip zincing steel sheets can be manufactured consistently for a long period, and with high productivity. COPYRIGHT: (C)2007,JPO&INPIT
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