GALVANNEALED STEEL SHEET

摘要

PROBLEM TO BE SOLVED: To produce a galvannealed steel sheet having excellent sliding characteristics at press forming. SOLUTION: The galvannealed steel sheet has a flat part on the surface of an iron-zinc alloy plating layer; a Zn oxide layer of >=10 nm thickness is formed on the surface of the flat part; and P is contained in the oxide layer. The content of P in the above oxide layer is 0.05 to 20 atomic %. The area ratio of the above flat part on the iron-zinc alloy plating layer is 20 to 80%.