Patent ID: 6087019
Filing Date: 2000-07-11
Classification: C21D,C23C

Abstract:
A plated steel sheet comprising:a steel matrixan iron oxide layera plated layer in the iron oxide layer wherein a connection portion comprising a metallic iron or an iron alloy and connecting the matrix to the plated layer is disposed in the iron oxide layer and wherein said connection portion has a density index D of not less than 20 defined by the equation D=(D.sub.L.sup.2 +D.sub.C.sup.2).sup.1/2whereD.sub.L : number of connection portions in a rolling direction at the section in the thickness direction of the iron oxide layer (portions/mm); andD.sub.C : number of connection portions in a direction perpendicular to the rolling direction at the section in the thickness direction of the iron oxide layer (portions/mm).