Isobe, Makoto; Kato, Chiaki; Seto, Kazuhiro; Kohno, Masaaki;

Plated steel sheet

This invention is a plated steel sheet formed by laminating an iron oxide layer and a plated layer on a steel matrix in this order, in which excellent plating adhesion property can uniformly be given to a full surface of the steel sheet by disposing a connection portion made from a metallic iron or an iron alloy connecting the steel matrix to the plated layer in the iron oxide layer. Particularly, it can provide means for easily forming a plated layer having an excellent adhesion property through hot dipping can be given to steel sheets being difficult to conduct the hot dipping such as high-strength steel sheet, stainless steel sheet and the like.

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What is claimed is:

1. A plated steel sheet comprising:

a steel matrix

an iron oxide layer

a 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.1/2

where

D.sub.L : number of connection portions in a rolling direction at the section in the thickness direction of the iron oxide layer (portions/mm); and

D.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).

2. A plated steel sheet according to claim 1, wherein a total length of the connection portion contacting with the plated layer at a section in a thickness direction of a plated steel sheet is not less than 0.1 mm per 1 mm of an interface among the plated layer, iron oxide layer and connection layer.

3. A plated steel sheet according to claim 1, wherein the steel matrix has a composition inclusive of components concentrating into a surface of the steel sheet during the annealing.

4. A plated steel sheet according to claim 3, wherein the steel matrix is a high-strength steel.

5. A plated steel sheet according to claim 3, wherein the steel matrix is a stainless steel.