COATED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

摘要

PURPOSE: A plating steel plate and a manufacture method thereof are provided to form an alloy coating layer consisting of aluminum and iron, thereby improving the adhesiveness between a steel plate and a coated layer. CONSTITUTION: A manufacture method of plating steel plate comprises the following steps of: coating an aluminum layer (20) on a steel plate (10) and then coating a magnesium layer (30) on an aluminum layer; forming an aluminum-iron alloy layer (40) between an aluminum layer and the steel plate by heat-treating the coated steel plate; and performing the heat-treatment at 450 to 550° for 5 to 20 minutes. The aluminum and magnesium layers are formed by evaporation under the vacuum condition.