Production manner null of the paint melting AlZn based alloy plated steel sheet which is superior in surface appearance

摘要

PROBLEM TO BE SOLVED: To provide a coated hot dip Al-Zn based alloy plated steel sheet having excellent surface appearance in which surface defects are not generated in a coated film particularly in a region subjected to forced bending as for a coated steel plate using a high Al-Zn based alloy plated steel sheet as an original sheet.;SOLUTION: The coated hot dip Al-Zn based alloy plated steel sheet is obtained by forming a hot dip Al-Zn based alloy plating layer comprising 40 to 70 mass% Al on the surface of a steel sheet, and further forming a film on the plating layer. The hot dip Al-Zn based alloy plating layer has an alloy layer on the boundary with the steel sheet surface, and the thickness of the alloy layer is 7 to 30% of the thickness of the whole plating layer including the alloy layer.;COPYRIGHT: (C)2004,JPO&NCIPI