Plated steel

Abstract

A plated steel includes: a steel; a zinc based electroplated layer formed on a surface of the steel; and an organic resin coating layer formed on a surface of the zinc based electroplated layer, in which the surface of the zinc based electroplated layer has hairline extending in a predetermined direction, Ra (ML) measured on the surface of the zinc based electroplated layer is 0.10 to 0.70 μm, on the surface of the zinc based electroplated layer, a peak number PPI measured in a hairline orthogonal direction with a reference level of 10 μinch satisfies PPI≥350×Ra (MC) with respect to Ra (MC), on a surface of the organic resin coating layer, Ra (CC) satisfies Ra (CC)/Ra (CL)≥1.10 with respect to Ra (CL), and Ra (CC) satisfies Ra (CC)<Ra (MC) with respect to Ra (MC).

Claims

1. A plated steel comprising: a steel; a zinc based electroplated layer formed on a surface of the steel; and an organic resin coating layer formed on a surface of the zinc based electroplated layer, wherein the surface of the zinc based electroplated layer has hairline extending in a predetermined direction, on the surface of the zinc based electroplated layer, a surface roughness Ra (ML) measured in an extension direction of the hairline is 0.10 to 0.70 μm, on the surface of the zinc based electroplated layer, a peak number PPI measured in a direction orthogonal to the extension direction with a reference level of 10 μinch satisfies a relationship expressed by Formula (I) with respect to a surface roughness Ra (MC) measured in the direction orthogonal to the extension direction, on a surface of the organic resin coating layer, a surface roughness Ra (CC) measured in the direction orthogonal to the extension direction satisfies a relationship expressed by Formula (II) with respect to a surface roughness Ra (CL) measured in the extension direction, and the surface roughness Ra (CC) satisfies a relationship expressed by Formula (III) with respect to the surface roughness Ra (MC),
PPI≥350×Ra(MC)  (I)
Ra(CC)/Ra(CL)≥1.10  (II)
Ra(CC)<Ra(MC)  (III), where, a unit of Ra(MC), Ra(CL) and Ra(CC) is μm.

2. The plated steel according to claim 1, wherein an average thickness of the organic resin coating layer is 10 μm or less.

3. The plated steel according to claim 2, wherein a minimum value of a thickness of the organic resin coating layer is 0.1 μm or more, and an average thickness of the organic resin coating layer is 1.0 μm or more.

4. The plated steel according to claim 2, wherein the surface roughness Ra (MC) is 1.00 μm or less.

5. The plated steel according to claim 2, wherein a substrate exposure ratio of the zinc based electroplated layer is less than 5%.

6. The plated steel according to claim 5, wherein a minimum value of a thickness of the organic resin coating layer is 0.1 μm or more, and an average thickness of the organic resin coating layer is 1.0 μm or more.

7. The plated steel according to claim 6: wherein a minimum value of a thickness of the organic resin coating layer is 0.1 μm or more, and an average thickness of the organic resin coating layer is 1.0 μm or more, the surface roughness Ra (MC) is 1.00 μm or less, a coating weight of the zinc based electroplated layer is 10 g/m.sup.2 or more, and a surface roughness Ra of the steel after removing the organic resin coating layer and the zinc based electroplated layer is 0.50 μm or less, where, the Ra is measured in a L direction.

8. The plated steel according to claim 5, wherein the surface roughness Ra (MC) is 1.00 μm or less.

9. The plated steel according to claim 5, wherein a coating weight of the zinc based electroplated layer is 10 g/m.sup.2 or more.

10. The plated steel according to claim 5, wherein a surface roughness Ra of the steel after removing the organic resin coating layer and the zinc based electroplated layer is 0.50 μm or less, where, the Ra is measured in a L direction.

11. The plated steel according to claim 2, wherein a coating weight of the zinc based electroplated layer is 10 g/m.sup.2 or more.

12. The plated steel according to claim 2, wherein a surface roughness Ra of the steel after removing the organic resin coating layer and the zinc based electroplated layer is 0.50 μm or less, where, the Ra is measured in a L direction.

13. The plated steel according to claim 1, wherein a minimum value of a thickness of the organic resin coating layer is 0.1 μm or more, and an average thickness of the organic resin coating layer is 1.0 μm or more.

14. The plated steel according to claim 1, wherein the surface roughness Ra (MC) is 1.00 μm or less.

15. The plated steel according to claim 1, wherein a substrate exposure ratio of the zinc based electroplated layer is less than 5%.

16. The plated steel according to claim 1, wherein a coating weight of the zinc based electroplated layer is 10 g/m.sup.2 or more.

17. The plated steel according to claim 1, wherein a surface roughness Ra of the steel after removing the organic resin coating layer and the zinc based electroplated layer is 0.50 μm or less, where, the Ra is measured in a L direction.

Description

EXAMPLES

(1) Hereinafter, the effects of the present invention will be specifically described by way of invention examples. The contents of the present invention are not limited by the contents described in the following examples.

(2) An annealed and temper-rolled steel sheet having a thickness of 0.6 mm (a steel sheet containing, as a composition by mass %, C: 0.001%, Si: 0.01%, Mn: 0.1%, P: 0.008%, S: 0.004%, and a remainder consisting of Fe and impurities) was subjected to electrolytic degreasing using a Na.sub.4SiO.sub.4 treatment solution with a concentration of 30 g/L under the conditions of a treatment solution of 60° C., a current density of 20 A/dm.sup.2, and a treatment time of 10 seconds, and was washed with water. Next, the electrolytically degreased steel was immersed in an aqueous H.sub.2SO.sub.4 solution having a concentration of 50 g/L at 60° C. for 10 seconds, and was further washed with water, whereby a plating pretreatment was performed thereon. Ra (arithmetic average roughness) of the steel sheet in an L direction (direction parallel to the rolling direction and providing the hairline) was each as shown in Tables 1A and 2A below.

(3) Next, the steel as described above was subjected to plating as shown in Tables 1A and 2A below to form a zinc based electroplated layer.

(4) A Zn plating (Table 1A: Nos. 1 to 15) was formed using a plating bath at pH 2.0 containing 1.0 mol/l of Zn sulfate heptahydrate and 50 g/L of anhydrous sodium sulfate by adjusting the plating time so that the coating weight became about 11 g/m.sup.2 (Nos. 5, 8, and 12), 22 g/m.sup.2 (Nos. 1 to 4, 7, 9 to 11, 14 to 15), 30 g/m.sup.2 (No. 13), and 38 g/m.sup.2 (No. 6) at a bath temperature of 50° C. and a current density of 50 A/dm.sup.2.

(5) A Zn—Ni plating (Table 1A: Nos. 16 to 30) was formed, when plating was performed at a bath temperature of 50° C. and a current density of 50 A/dm.sup.2, using a plating bath at pH 2.0 containing a total of 1.2 mol/1 of Zn sulfate heptahydrate and Ni sulfate hexahydrate, Zn sulfate heptahydrate and Ni sulfate hexahydrate being adjusted in a ratio such that the composition in Table 1A below was obtained, and 50 g/L of anhydrous sodium sulfate by adjusting the plating time so that the coating weight became about 11 g/m.sup.2 (No. 26), 22 g/m.sup.2 (Nos. 16 to 23, 25, 27, 29, and 30), 30 g/m.sup.2 (No. 28), and 38 g/m.sup.2 (No. 24).

(6) A Zn—Fe plating (Tables 1A to 2A: Nos. 31 to 45) was formed, when plating was performed at a bath temperature of 50° C. and a current density of 50 A/dm.sup.2, using a plating bath at pH 2.0 containing a total of 1.2 mol/1 of Zn sulfate heptahydrate and Fe(II) sulfate heptahydrate, Zn sulfate heptahydrate and Fe(II) sulfate heptahydrate being adjusted in a ratio such that the composition in Tables 1A and 2A below was obtained, and 50 g/L of anhydrous sodium sulfate by adjusting the plating time so that the coating weight became about 11 g/m.sup.2 (Nos. 35 and 38), 22 g/m.sup.2 (Nos. 31 to 34, 36 to 37, 40 to 42, and 44 to 45), 30 g/m.sup.2 (No. 43), and 38 g/m.sup.2 (No. 39).

(7) A Zn—Co plating (Table 2A: Nos. 46 to 60) was formed, when plating was performed at a bath temperature of 50° C. and a current density of 50 A/dm.sup.2, using a plating bath at pH 2.0 containing a total of 1.2 mol/1 of Zn sulfate heptahydrate and Co sulfate heptahydrate, Zn sulfate heptahydrate and Co sulfate heptahydrate being adjusted in a ratio such that the composition in Table 2A below was obtained, and 50 g/L of anhydrous sodium sulfate by adjusting the plating time so that the coating weight became about 22 g/m.sup.2 (Nos. 46 to 52, and 54 to 60) and 38 g/m.sup.2 (No. 53).

(8) A Zn—Ni—Fe plating (Table 2A: Nos. 61 and 62) was formed, when plating was performed at a bath temperature of 50° C. and a current density of 50 A/dm.sup.2, using a plating bath at pH 2.0 containing a total of 1.2 mol/l of Zn sulfate heptahydrate, Ni sulfate hexahydrate, and Fe(II) sulfate heptahydrate, Zn sulfate heptahydrate, Ni sulfate hexahydrate, and Fe(II) sulfate heptahydrate being adjusted in a ratio such that the composition in Table 2A below was obtained, and 50 g/L of anhydrous sodium sulfate by adjusting the plating time so that the coating weight became about 11 g/m.sup.2 (No. 61) and 22 g/m.sup.2 (No. 62).

(9) A Zn—Co—Mo plating (Table 2A: Nos. 63 and 64) was formed, when plating was performed at a bath temperature of 50° C. and a current density of 50 A/dm.sup.2, using a plating bath at pH 4.0 containing a total of 1.2 mol/l of Zn sulfate heptahydrate, Co sulfate heptahydrate, and sodium molybdate dihydrate, Zn sulfate heptahydrate, Co sulfate heptahydrate, and sodium molybdate dihydrate being adjusted in a ratio such that the composition in Table 2A below was obtained, 25 g/L of sodium formate, and 50 g/L of boric acid by adjusting the plating time so that the coating weight became about 22 g/m.sup.2.

(10) In all the plating treatments described above, the plating solution was allowed to flow such that the relative flow velocity was 1 m/sec. Moreover, the composition of the obtained plating was confirmed by immersing the plated steel sheet in 10 mass % hydrochloric acid containing an inhibitor (No. 700AS manufactured by ASAHI Chemical Co., Ltd.) to cause the plated steel sheet to be dissolved and peel, and analyzing the dissolved solution by ICP.

(11) In addition, as the above reagents, general reagents were used.

(12) For Nos. 1 to 64, hairline was imparted to the obtained plated steel sheet along the L direction (rolling direction) of the steel sheet. The hairline was formed by pressing abrasive paper of various particle sizes against the steel sheet and changing the rolling force and the number of times of polishing.

(13) The plating roughness and coating weight after the hairline was imparted are as shown in Tables 1A and 2A below.

(14) The plating roughness (that is, surface roughness Ra) was measured with a three-dimensional surface roughness measuring machine (SURFCOM 1500DX3 manufactured by Tokyo Seimitsu Co., Ltd.). The coating weight was calculated from the difference in weight before and after dissolution and peeling by immersion in 10 mass % hydrochloric acid containing an inhibitor (No. 700AS manufactured by ASAHI Chemical Co., Ltd.).

(15) The coating weight shown in Tables 1A and 2A below is coating weight measured after the hairline was imparted, and the difference from the above coating weight corresponds to the decrease in the plating in the process of imparting the hairline.

(16) The substrate exposure ratio was measured by cutting the obtained plated steel sheet, analyzing five 1-mm square visual fields with EPMA (JXA8230 manufactured by JEOL, Ltd), and calculating the ratio of the area where Zn was not detected by image analysis and Fe was detected. EPMA analysis was performed under the conditions of an acceleration voltage of 15 kV and an irradiation current of 30 nA. A region where the detection intensity of Zn was 1/16 or less of that in a case where a standard sample (pure Zn) was measured was determined as a region where Zn was not detected, and a region where the detection intensity of Fe was more than 14/16 of that in a case where a standard sample (pure Fe) was measured was determined as a region where Fe was detected.

(17) The obtained results are shown in Tables 1A and 2A below.

(18) A transparent organic resin coating layer was formed on the above-described plated steel sheet to which the hairline was applied. As a transparent organic resin, treatment solutions having various concentrations and viscosities, in which a urethane resin (HUX-232 manufactured by ADEKA Corporation) is dispersed in water, were prepared, and these treatment solutions were drawn up with a roller, and transferred so as to achieve the thickness shown in Tables 1A and 2A below after being baked and dried. The steel sheet to which the treatment solution was transferred was placed in a furnace maintained at 250° C., held for one minute to five minutes until the attainment temperature of the steel sheet reached 210° C., and then taken out and cooled.

(19) Here, various sizes of polyethylene wax were added to Nos. 3 to 5, Nos. 11 to 15, Nos. 18 to 20, Nos. 26 to 30, Nos. 33 to 35, Nos. 41 to 45, Nos. 48 to 50, and Nos. 56 to 64.

(20) Acrylic beads (GR400 transparent manufactured by Negami Chemical Industrial Co., Ltd.) with an average particle size of 1.5 times the thickness of the organic resin coating layer were added to Nos. 4, 19, 34, and 49 in a ratio of 3 mass % to the solid content of the paint.

(21) When the above treatment solution was prepared, the treatment solution was adjusted using BYK-425 (manufactured by BYK Additives & Instruments) as a viscosity modifier to have a viscosity of 10 [Pa.Math.s] or more at a shear rate of 0.1 [1/sec] and a viscosity of 0.01 [Pa.Math.s] or less at a shear rate of 1000 [1/sec]. The viscosity modifier was not added only to the treatment solution corresponding to No. 33, and the viscosity at a shear rate of 0.1 [1/sec] was adjusted to be less than 10 [Pa.Math.s].

(22) The surface roughness of the organic resin coating layer was measured by the same method as the surface roughness of the zinc based electroplated layer. In addition, the glossinesses G60 (G1) and G60 (Gc) of the obtained plated steels were each measured by a gloss meter (manufactured by Suga Test Instruments Co., Ltd.: Gloss Meter UGV-6P). The obtained results are summarized in Tables 1A, 1B, 2A and 2B below.

(23) Regarding the corrosion resistance (more specifically, long-term corrosion resistance) of the obtained plated steel, the obtained sample was cut into a size of 75 mm×100 mm, the end surface and the rear surface were protected with a tape seal, and the sample was provided for a 35° C.-5% NaCl salt spray test (JIS Z 2371). A rust generation ratio of 5% or less after 240 hours was evaluated as OK and a rust generation ratio of more than 5% was evaluated as NG. The obtained results are shown in Tables 1B and 2B below.

(24) TABLE-US-00001 TABLE 1A Organic resin coating layer Steel Zinc based electroplated layer Resin coating Surface Surface roughness coating Substrate layer thickness roughness Kind of Ra (ML) Ra (MC) PPI/Ra weight exposure Ra(CC)/ Ra(CC)/ Average Minimum No. Ra (μm) Plating (μm) (μm) (MC) (g/m.sup.2) ratio (%) Ra(CL) Ra(MC) (μm) (μm) 1 0.22 Zn 0.51 0.56 296 20.8 0 1.13 0.30 10 9.0 2 1.22 Zn 1.13 1.15 452 20.6 0 1.38 0.16 10 8.2 3 0.22 Zn 0.35 0.39 846 15.3 10 0.89 0.21 13 12.3 4 0.22 Zn 0.42 0.51 731 19.8 0 0.98 1.22 10 9.4 5 0.22 Zn 0.33 1.83 328 8.1 35 1.80 0.27 3 0.03 6 1.22 Zn 0.56 1.13 433 35.3 20 1.33 0.64 3 0.2 7 0.22 Zn 0.29 0.33 879 19.6 0 1.28 0.70 0.5 0.2 8 0.74 Zn 0.68 0.72 588 9.3 6 1.17 0.29 10 7.8 9 0.22 Zn 0.36 0.47 951 20.3 0 1.10 0.23 10 8.9 10 0.22 Zn 0.25 0.34 1524 20.2 1 1.45 0.94 10 8.6 11 0.22 Zn 0.38 0.46 354 19.8 0 1.13 0.39 10 9.2 12 0.22 Zn 0.19 0.23 665 9.8 4 1.15 0.65 10 8.7 13 0.22 Zn 0.23 0.31 860 27.2 0 1.33 0.39 7 5.4 14 0.22 Zn 0.29 0.58 972 18.3 2 1.18 0.22 5 3.8 15 0.22 Zn 0.39 0.47 930 19.8 0 1.36 0.32 3 1.9 16 0.22 Zn—12% Ni 0.21 0.25 1108 15.6 20 1.07 0.64 13 12.2 17 1.22 Zn—12% Ni 1.01 0.94 365 20.3 0 1.00 0.23 10 9.8 18 0.22 Zn—12% Ni 0.53 0.62 516 19.2 0 1.09 0.19 13 11.8 19 0.22 Zn—12% Ni 0.53 0.62 806 19.2 0 1.13 1.50 10 6.9 20 0.22 Zn—12% Ni 0.23 0.24 263 13.8 30 1.15 0.63 10 8.3 21 0.22 Zn—12% Ni 0.23 0.24 675 19.6 0 1.14 0.45 0.5 0.3 22 0.74 Zn—12% Ni 0.66 0.78 388 19.5 0 1.32 0.37 7 4.7 23 0.22 Zn—12% Ni 0.18 0.22 682 13.3 8 1.10 0.50 10 9.1 24 1.22 Zn—12% Ni 0.63 1.22 633 32.9 15 1.21 0.68 3 1.1 25 0.22 Zn—12% Ni 0.18 0.26 577 13.6 0 1.14 0.96 10 7.7 26 0.22 Zn—12% Ni 0.24 0.27 393 8.9 3 1.22 0.41 10 8.4 27 0.22 Zn—12% Ni 0.34 0.52 396 16.4 1 1.33 0.31 10 7.6 28 0.22 Zn—10% Ni 0.43 0.50 442 28.5 0 1.30 0.26 7 5.5 29 0.22 Zn—8% Ni 0.21 0.32 1008 18.4 0 1.40 0.44 5 3.4 30 0.22 Zn—5% Ni 0.25 0.42 822 18.2 0 1.38 0.26 3 2.2 31 0.22 Zn—15% Fe 0.60 0.61 337 20.0 0 1.33 0.26 10 9.1

(25) TABLE-US-00002 TABLE 1B Evaluation result Corrosion resistance (long-term corrosion No. Gl Gc Gc/Gl resistance) Note 1 85 77 0.91 OK Comparative Example 2 43 29 0.67 OK Comparative Example 3 92 90 0.98 NG Comparative Example 4 62 63 1.02 OK Comparative Example 5 240 66 0.28 NG Comparative Example 6 216 71 0.33 NG Example 7 224 141 0.63 OK Example 8 72 46 0.64 NG Example 9 98 68 0.69 OK Example 10 72 48 0.67 OK Example 11 108 73 0.68 OK Example 12 132 81 0.61 NG Example 13 213 130 0.61 OK Example 14 146 80 0.55 OK Example 15 156 91 0.59 OK Example 16 89 79 0.89 NG Comparative Example 17 83 67 0.81 OK Comparative Example 18 92 86 0.93 OK Comparative Example 19 59 48 0.81 OK Comparative Example 20 198 168 0.85 NG Comparative Example 21 191 108 0.57 OK Example 22 79 54 0.68 OK Example 23 102 70 0.69 NG Example 24 198 73 0.37 NG Example 25 79 53 0.67 OK Example 26 90 62 0.69 NG Example 27 167 109 0.65 OK Example 28 198 124 0.62 OK Example 29 192 117 0.61 OK Example 30 188 110 0.59 OK Example 31 121 109 0.90 OK Comparative Example

(26) TABLE-US-00003 TABLE 2A Organic resin coating layer Steel Zinc based electroplated layer Resin coating Surface Surface roughness coating Substrate layer thickness roughness Kind of Ra (ML) Ra (MC) PPI/Ra weight exposure Ra(CC)/ Ra(CC)/ Average Minimum No. Ra (μm) Plating (μm) (μm) (MC) (g/m.sup.2) ratio (%) Ra(CL) Ra(MC) (μm) (μm) 32 1.22 Zn—15% Fe 0.78 0.83 506 20.1 0 1.17 0.25 10 9.4 33 0.22 Zn—15% Fe 0.48 0.61 374 19.8 0 1.00 0.18 13 12.3 34 0.22 Zn—15% Fe 0.24 0.32 563 18.8 0 1.21 1.09 10 6.4 35 0.22 Zn—15% Fe 0.26 1.23 309 8.1 30 1.65 0.51 3 1.2 36 0.22 Zn—15% Fe 0.17 0.19 926 19.3 0 1.31 0.89 0.5 0.3 37 0.74 Zn—15% Fe 0.66 0.73 384 19.6 0 1.16 0.51 10 7.8 38 0.22 Zn—15% Fe 0.16 0.18 456 9.7 2 1.13 0.75 10 8.1 39 1.22 Zn—15% Fe 0.68 1.33 433 35.6 36 1.26 0.49 4 0.3 40 0.22 Zn—15% Fe 0.19 0.23 887 19.9 0 1.22 0.96 10 7.6 41 0.22 Zn—15% Fe 0.17 0.19 368 20.4 0 1.13 0.89 10 8.0 42 0.22 Zn—15% Fe 0.31 0.52 556 17.8 4 1.27 0.27 10 6.8 43 0.22 Zn—12% Fe 0.29 0.36 1030 28.8 0 1.56 0.39 7 5.3 44 0.22 Zn—10% Fe 0.34 0.44 970 19.9 0 1.44 0.30 5 3.8 45 0.22 Zn—6% Fe 0.27 0.48 852 19.5 0 1.20 0.25 3 2.2 46 0.22 Zn—2% Co 0.54 0.58 183 18.2 0 1.09 0.60 10 9.3 47 1.22 Zn—2% Co 1.13 1.16 382 20.4 0 1.15 0.72 10 8.7 48 0.22 Zn—2% Co 0.34 0.42 562 19.5 0 1.05 0.55 13 11.8 49 0.22 Zn—2% Co 0.29 0.38 666 19.8 0 1.23 1.13 10 6.9 50 0.22 Zn—2% Co 0.31 1.33 320 17.3 28 1.79 0.81 7 5.8 51 0.22 Zn—2% Co 0.26 0.31 958 20.2 0 1.27 0.90 0.5 0.2 52 0.74 Zn—2% Co 0.68 0.75 387 19.9 2 1.13 0.47 10 8.7 53 1.22 Zn—2% Co 0.64 1.19 399 34.8 16 1.39 0.73 3 0.6 54 0.22 Zn—2% Co 0.18 0.21 905 19.4 0 1.13 0.59 10 8.8 55 0.22 Zn—2% Co 0.23 0.35 543 18.6 0 1.50 0.94 10 8.7 56 0.22 Zn—2% Co 0.32 0.39 359 19.8 0 1.24 0.54 10 8.2 57 0.22 Zn—2% Co 0.17 0.23 878 17.9 4 1.27 0.61 10 7.6 58 0.22 Zn—0.5% Co 0.24 0.46 1044 19.8 0 1.20 0.52 7 5.3 59 0.22 Zn—5% Co 0.54 0.71 351 19.9 0 1.25 0.14 5 3.5 60 0.22 Zn—9% Co 0.55 0.71 419 19.9 0 1.18 0.18 3 2.1 61 0.22 Zn—10% 0.24 0.27 393 8.9 3 1.22 0.41 9 7.9 Ni—2% Fe 62 0.22 Zn—10% 0.65 0.66 400 19.9 0 1.18 0.20 9 8.3 Ni—2% Fe 63 0.22 Zn—2% 0.33 0.42 644 19.3 0 1.38 0.25 7 7.4 Co—0.5% Mo 64 0.22 Zn—2% 0.46 0.50 442 18.9 1 1.30 0.26 9 8.1 Co—0.5% Mo

(27) TABLE-US-00004 TABLE 2B Evaluation result Corrosion resistance (long-term corrosion No. Gl Gc Gc/Gl resistance) Note 32 63 47 0.75 OK Comparative Example 33 81 80 0.99 OK Comparative Example 34 53 55 1.04 OK Comparative Example 35 203 51 0.25 NG Comparative Example 36 228 153 0.67 OK Example 37 74 48 0.65 OK Example 38 133 92 0.69 NG Example 39 138 56 0.41 NG Example 40 93 63 0.68 OK Example 41 183 127 0.69 OK Example 42 166 95 0.57 OK Example 43 171 108 0.63 OK Example 44 148 95 0.64 OK Example 45 142 89 0.63 OK Example 46 73 67 0.92 OK Comparative Example 47 58 38 0.66 OK Comparative Example 48 122 114 0.93 OK Comparative Example 49 65 66 1.02 OK Comparative Example 50 174 46 0.26 NG Comparative Example 51 169 97 0.57 OK Example 52 72 48 0.67 OK Example 53 153 73 0.48 NG Example 54 126 86 0.68 OK Example 55 72 50 0.69 OK Example 56 158 108 0.68 OK Example 57 172 88 0.51 OK Example 58 156 91 0.58 OK Example 59 156 100 0.64 OK Example 60 151 99 0.66 OK Example 61 90 62 0.69 NG Example 62 140 96 0.69 OK Example 63 183 113 0.62 OK Example 64 198 124 0.62 OK Example

(28) According to Tables 1A, 1B, 2A, and 2B, all of the examples of the present invention were provided with hairline, the glossiness G60 (Gl) measured in the hairline direction, which is an index indicating whether a steel has a metallic texture, was 70 to 400 and was in a range of 0.30≤Gc/G1≤0.70 with respect to the glossiness G60 (Gc) measured in the hairline orthogonal direction. That is, all of the examples corresponding to the plated steel of the present invention had excellent metallic texture.

(29) Contrary to this, in all of the comparative examples, the glossiness G60 (Gl) was less than 70 or was out of the range of 0.30≤Gc/G1≤0.70 with respect to the glossiness G60 (Gc) measured in the hairline orthogonal direction. That is, it became clear that the plated steel according to the comparative example cannot be said to have an excellent metallic texture because the impression of the metal surface and the impression of the light reflected on the resin surface deviated from each other.

(30) While the preferred embodiments of the present invention have been described above in detail, the present invention is not limited to these examples. It is obvious that those skilled in the art to which the present invention belongs can conceive of various changes or modifications within the scope of the technical idea described in the claims, and it is understood that these also fall within the technical scope of the present invention.

INDUSTRIAL APPLICABILITY

(31) According to the present invention, it is possible to provide a plated steel having hairline appearance and having an excellent metallic texture while using an inexpensive steel.