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US 2018/0371598 A1Published application
Plated steel sheet having fine and even plating structure and plated steel sheet manufacturing method
AssigneePosco
InventorSu Young KIM
Life of this patent
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Abstract
Provided is a plated steel sheet having an excellent quality with fine and even plating texture, the plated steel sheet including a base steel sheet and a Zn plating layer formed on the base steel sheet, wherein a Zn crystal in the plating layer has a size of 5 μm or less.
Claims24
A plated steel sheet having a fine and even plating texture, the plated steel sheet comprising:
- a Zn-based plating layer formed on a steel sheet by hot-dipping, then contact-type pressure cooling,
- wherein the Zn-based plating layer includes a Zn single-phase texture having an average particle size of 5 μm or less,
- a Zn single-phase distribution B/A in the plating layer satisfies a condition of being 0.5 to 1.0, and thus the Zn single-phase is formed having an even distribution with respect to a thickness direction of the plating layer,
- wherein A is a fraction of the entire Zn single-phase with respect to the thickness direction of the plating layer and B is a fraction of the Zn single-phase in an outer surface layer portion of the plating layer.
1 more element
A plated steel sheet manufacturing method comprising:
- plating a steel sheet, adjusting a plating adhesion amount of the steel sheet, and cooling the steel sheet,
- wherein the cooling includes cooling the steel sheet by applying cold air to the steel sheet with a cooling body in contact with a plating layer on a surface of the steel sheet, and cooling the cooling body by supplying a cryogenic liquid including liquid nitrogen or liquid helium to the cooling body.
A plated steel sheet manufacturing method comprising:
- plating a steel sheet, adjusting a plating adhesion amount of the steel sheet, and cooling the steel sheet,
- wherein the adjusting includes primarily adjusting the plating adhesion amount with a knife in contact with a plating layer on a surface of the steel sheet, and cooling the knife by supplying a cryogenic liquid including liquid nitrogen or liquid helium to the knife.
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Dependencies are inferred from the claim text.