Hot-dip plated steel sheet

Abstract

A hot-dip plated steel sheet includes a hot-dip plated layer formed on a steel sheet. An absolute value of a difference in an area fraction of a first region between a pattern portion and a non-pattern portion is 30% or more. A cross section parallel to a surface is exposed at any position of 3t/4 position, t/2 position, or t/4 position from the surface of the hot-dip plated layer, virtual lattice lines are drawn on each of the cross sections, a region in which a proportion of an area fraction B of a [Zn phase] to a total area fraction A of the [Zn phase] and an [Al/MgZn2/Zn ternary eutectic structure] is 20% or more in each of a plurality of regions partitioned by the lattice lines is defined as the first region, and a region in which the proportion is less than 20% is defined as the second region.

1 . A hot-dip plated steel sheet, comprising:
 a steel sheet and a hot-dip plated layer formed on a surface of the steel sheet, wherein   the hot-dip plated layer, in terms of average composition, contains 5 to 22 mass % of Al and 1.0 to 10 mass % of Mg with a remainder including Zn and impurities,   the hot-dip plated layer includes a pattern portion and a non-pattern portion,   the pattern portion and the non-pattern portion each includes one or two of a first region and a second region obtained by the following measurement method, and   an absolute value of a difference between an area fraction of the first region in the pattern portion and an area fraction of the first region in the non-pattern portion is 30% or more,   [Measurement Method]   assuming that a thickness of the hot-dip plated layer is t, a cross section of 1 to 5 mm square parallel to a surface of the hot-dip plated layer is exposed at any position of 3t/4 position, t/2 position, or t/4 position from the surface of the hot-dip plated layer, virtual lattice lines are drawn at intervals of 0.5 mm on each of the cross sections, a region in which a proportion (B/A (%)) of an area fraction B of a [Zn phase] to a total area fraction A of the [Zn phase] and an [Al/MgZn 2 /Zn ternary eutectic structure] is 20% or more in each of a plurality of regions partitioned by the virtual lattice lines is defined as the first region, and a region in which the proportion (B/A (%)) is less than 20% is defined as the second region.   
     
     
         2 . A hot-dip plated steel sheet, comprising:
 a steel sheet and a hot-dip plated layer formed on a surface of the steel sheet, wherein   the hot-dip plated layer, in terms of average composition, contains 5 to 22 mass % of Al and 1.0 to 10 mass % of Mg with a remainder including Zn and impurities,   the hot-dip plated layer further contains one or two selected from the group consisting of a group A and a group B below,   the hot-dip plated layer includes a pattern portion and a non-pattern portion,   the pattern portion and the non-pattern portion each includes one or two of a first region and a second region obtained by the following measurement method, and   an absolute value of a difference between an area fraction of the first region in the pattern portion and an area fraction of the first region in the non-pattern portion is 30% or more,   [Group A] Si: 0.0001 to 2 mass %   [Group B] 0.0001 to 2 mass % in total of one or more of Ni, Ti, Zr, Sr, Fe, Sb, Pb, Sn, Ca, Co, Mn, P, B, Bi, Cr, Sc, Y, REM, Hf, and C   [Measurement Method]   assuming that a thickness of the hot-dip plated layer is t, a cross section of 1 to 5 mm square parallel to a surface of the hot-dip plated layer is exposed at any position of 3t/4 position, t/2 position, or t/4 position from the surface of the hot-dip plated layer, virtual lattice lines are drawn at intervals of 0.5 mm on each of the cross sections, a region in which a proportion (B/A (%)) of an area fraction B of a [Zn phase] to a total area fraction A of the [Zn phase] and an [Al/MgZn 2 /Zn ternary eutectic structure] is 20% or more in each of a plurality of regions partitioned by the virtual lattice lines is defined as the first region, and a region in which the proportion (B/A (%)) is less than 20% is defined as the second region.   
     
     
         3 . The hot-dip plated steel sheet according to  claim 1 , wherein the pattern portion is disposed to have a shape of any one of a straight line portion, a curve portion, a dot portion, a figure, a number, a symbol, and a character, or a combination of two or more thereof. 
     
     
         4 . The hot-dip plated steel sheet according to  claim 1 , wherein an adhesion amount of the hot-dip plated layer is 30 to 600 g/m 2  in total on both surfaces of the steel sheet. 
     
     
         5 . The hot-dip plated steel sheet according to  claim 2 , wherein the hot-dip plated layer has an average composition containing the group A in terms of mass %. 
     
     
         6 . The hot-dip plated steel sheet according to  claim 2 , wherein the hot-dip plated layer has an average composition containing the group B in terms of mass %. 
     
     
         7 . The hot-dip plated steel sheet according to  claim 2 , wherein the pattern portion is disposed to have a shape of any one of a straight line portion, a curve portion, a dot portion, a figure, a number, a symbol, and a character, or a combination of two or more thereof. 
     
     
         8 . The hot-dip plated steel sheet according to  claim 2 , wherein an adhesion amount of the hot-dip plated layer is 30 to 600 g/m 2  in total on both surfaces of the steel sheet.