Plated steel sheet
AssigneeNippon Steel Corporation
InventorTakashi Futaba
Life of this patent
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Abstract
A protective film of a plated steel sheet is formed on a plating layer that has a texture on its surface. The protective film contains a binder resin and a plurality of resin particles. The surface of the protective film includes a flat portion, and a plurality of convex portions formed by a part of the resin particles protruding from the flat portion. An average film thickness d of the protective film is 10.0 μm or less. A total area fraction S of a plurality of the convex portions when the surface of the protective film is seen in plan view is 10.0% or less. F1 defined by Formula (1) is 10.0 or more, and F2 defined by Formula (2) is 0.7 to 3.0. F 1 = D × S ( 1 ) F 2 = D / d ( 2 ) where, in Formulae, an average particle diameter D (μm) of the resin particles is substituted for “D”.
Claims4
A plated steel sheet, comprising:
- a base-metal steel sheet,
- a plating layer formed on a surface of the base-metal steel sheet, and having a texture on a surface, and
- a protective film that is formed on the surface of the plating layer,
- wherein,
- the protective film contains:
- a binder resin, and
- a plurality of resin particles having an average particle diameter of 10.0 μm or less;
- a surface of the protective film includes:
- a flat portion, and
- a plurality of convex portions formed by a part of a plurality of the resin particles protruding from the flat portion;
- an average film thickness d of the protective film is 10.0 μm or less;
- a total area fraction S of a plurality of the convex portions when the surface of the protective film is seen in plan view is 10.0% or less;
- F1 defined by Formula (1) is 10.0 or more;
- and
- F2 defined by Formula (2) is 0.7 to 1.3;
- F
-
- 1
- =
- D
- ×
- S
- (
- 1
- )
- F
-
- 2
- =
- D
- /
- d
- (
- 2
- )
- where, in Formula (1) and Formula (2), an average particle diameter D (μm) of a plurality of the resin particles is substituted for “D”, the total area fraction S (%) of a plurality of the convex portions is substituted for “S”, and the average film thickness d (μm) of the protective film is substituted for “d”.
Dependencies are inferred from the claim text.