# US 12,180,564 B2 · Plated steel sheet

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,180,564 B2
- Document ID: US12180564B2
- Status: Granted
- Kind: B2
- Application number: 18/703,998
- Filed: 2022-08-16
- Published: 2024-10-10
- Granted: 2024-12-31
- Earliest claimed: 2021-10-26
- Assignees: Nippon Steel Corporation
- Applicants: Nippon Steel Corporation
- Inventors: Kohei Tokuda; Mamoru Saito; Yuto Fukuda; Yasuto Goto; Yasuhiro Majima; Naoyuki Yamato; Fumiaki Nakamura; Hidetoshi Shindo; Koji Kawanishi; Kenichiro Matsumura; Hiroshi Takebayashi
- Web page: https://patentgrep.com/patent/US12180564B2

## CPC

- C22C 18/04: with aluminium as the next major constituent
- C23C 2/06: Zinc or cadmium or alloys based thereon
- C23C 2/02: Pretreatment of the material to be coated, e.g. for coating on selected surface areas (C23C2/30 takes precedence)
- C23C 2/0224: {Two or more thermal pretreatments}
- C23C 2/024: {by cleaning or etching}
- C23C 2/28: Thermal after-treatment, e.g. treatment in oil bath
- C23C 2/29: {Cooling or quenching}
- C23C 2/40: Plates; Strips
- C23C 30/005: {on hard metal substrates}
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)

## Abstract

A plated steel sheet comprises a plated layer on a surface of a steel sheet, in which in the plated layer, the total amount ΣA of Sn, Bi, and In is less than 0.75%, the total amount ΣB of Ca, Y, La, and Ce is 0.03 to 0.60%, the total amount ΣC of Cr, Ti, Ni, Co, V, Nb, Cu, and Mn is 0 to 1.00%, Sn≤Si, and 20.0≤Mg/Si are satisfied, and in an X-ray diffraction pattern of a surface of the plated layer, an X-ray diffraction peak of Al2.15Zn1.85Ca, an X-ray diffraction peak of CaZn2, and an X-ray diffraction peak of η′-MgZn2 satisfy a predetermined relationship.

## Claims

### Claim 1

A plated steel sheet comprising a plated layer on a surface of a steel sheet, wherein the plated layer has an average chemical composition comprising, in mass %,
Al: more than 15.0% and 30.0% or less,
Mg: more than 5.0% and 15.0% or less,
Sn: 0 to 0.70%,
Bi: 0 to 0.35%,
In: 0 to 0.35%,
Ca: 0.03 to 0.60%,
Y: 0 to 0.30%,
La: 0 to 0.30%,
Ce: 0 to 0.30%,
Si: 0.01 to 0.75%,
Cr: 0 to 0.25%,
Ti: 0 to 0.25%,
Ni: 0 to 1.00%,
Co: 0 to 0.25%,
V: 0 to 0.25%,
Nb: 0 to 0.25%,
Cu: 0 to 0.25%,
Mn: 0 to 0.25%,
Fe: 0 to 5.0%,
Sr: 0 to 0.5%,
Sb: 0 to 0.5%,
Pb: 0 to 0.5%,
B: 0 to 0.5%,
Li: 0 to 0.5%,
Zr: 0 to 0.5%,
Mo: 0 to 0.5%,
W: 0 to 0.5%,
Ag: 0 to 0.5%,
P: 0 to 0.5%, and
a remainder of Zn and impurities,
a total amount ΣA of Sn, Bi and In is 0% or more and less than 0.75%,
a total amount ΣB of Ca, Y, La, and Ce is 0.03 to 0.60%,
a total amount ΣC of Cr, Ti, Ni, Co, V, Nb, Cu, and Mn is 0 to 1.00%,
Sn≤Si and 20.0≤Mg/Si are satisfied, and
when I1 to I3 determined from X-ray diffraction peaks of Al2.15Zn1.85Ca, 14 determined from an X-ray diffraction peak of CaZn2, and 15 and 16 determined from X-ray diffraction peaks of η′-MgZn2 are defined by the following Formulas (1) to (6) in an X-ray diffraction pattern of a surface of the plated layer, measured under conditions of an X-ray output of 40 kV and 150 mA using a Cu-Kα ray, the following Formulas (A) and (B) are satisfied:
I
1
=
I
⁢
max
⁡
(
2
⁢
2
.
5
⁢
4
∼
23.3
°
)
I
⁡
(
22.54
°
)
+
0
.
4
⁢
74
⁢
{
❘
"\[LeftBracketingBar]"
I
⁡
(
23.3
°
)
-
I
⁡
(
22.54
°
)
❘
"\[RightBracketingBar]"
}
(
1
)
I
2
=
I
⁢
max
⁡
(
3
⁢
1
.
0
⁢
0
∼
32.
°
)
I
⁡
(
31.
°
)
+
0
.
6
⁢
2
⁢
{
❘
"\[LeftBracketingBar]"
I
⁡
(
32.
°
)
-
I
⁡
(
31.
°
)
❘
"\[RightBracketingBar]"
}
(
2
)
I
3
=
I
⁢
max
⁡
(
4
⁢
3
.
8
⁢
0
∼
44.3
°
)
I
⁡
(
43.5
°
)
+
0.48
{
❘
"\[LeftBracketingBar]"
I
⁡
(
44.3
°
)
-
I
⁡
(
43.8
°
)
❘
"\[RightBracketingBar]"
}
(
3
)
I
4
=
I
⁢
max
⁡
(
3
⁢
3
.
0
⁢
0
∼
33.8
°
)
I
⁡
(
33.
°
)
+
0
.
4
⁢
3
⁢
75
⁢
{
❘
"\[LeftBracketingBar]"
I
⁡
(
33.8
°
)
-
I
⁡
(
33.
°
)
❘
"\[RightBracketingBar]"
}
(
4
)
I
5
=
I
⁢
max
⁡
(
26.
∼
26.4
°
)
I
⁡
(
26.
°
)
+
0
.
3
⁢
75
⁢
{
❘
"\[LeftBracketingBar]"
I
⁡
(
26.4
°
)
-
I
⁡
(
26.
°
)
❘
"\[RightBracketingBar]"
}
(
5
)
I
6
=
I
⁢
max
⁡
(
4
⁢
9
.
0
⁢
0
∼
49.6
°
)
I
⁡
(
49.
°
)
+
0
.
3
⁢
67
⁢
{
❘
"\[LeftBracketingBar]"
I
⁡
(
49.6
°
)
-
I
⁡
(
49.
°
)
❘
"\[RightBracketingBar]"
}
(
6
)
4.05
≤
I
1
+
I
2
+
I
3
+
I
4
(
A
)
2.05
≤
I
5
+
I
6
(
B
)
wherein, in Formulas (1) to (6), Imax (k to m°) is a maximum value of an X-ray diffraction intensity at a diffraction angle 2θ between k to m°, I (n°) is an X-ray diffraction intensity at a diffraction angle 2θ of n°, and k, m, and n are diffraction angles 2θ each shown in Formulas (1) to (6).

### Claim 2 (depends on 1)

The plated steel sheet according to claim 1, wherein
the average chemical composition of the plated layer satisfies 20.0≤Mg/Si≤38.0 and 3.00≤Al/Mg≤4.00, and
when I7 to I9 determined from X-ray diffraction peaks of MgAlSi are defined by the following Formulas (7) to (8) in an X-ray diffraction pattern of a surface of the plated layer, measured under conditions of an X-ray output of 40 kV and 150 mA using a Cu-Kα ray, the following Formula (C) is satisfied:
I
7
=
I
⁢
max
⁡
(
2
⁢
4
.
3
⁢
0
∼
24.9
°
)
I
⁡
(
24.3
°
)
+
0.6
{
❘
"\[LeftBracketingBar]"
I
⁡
(
24.9
°
)
-
I
⁡
(
24.3
°
)
❘
"\[RightBracketingBar]"
}
(
7
)
I
8
=
I
⁢
max
⁡
(
4
⁢
6
.
1
⁢
0
∼
46.4
°
)
I
⁡
(
46.1
°
)
+
0.6
{
❘
"\[LeftBracketingBar]"
I
⁡
(
46.4
°
)
-
I
⁡
(
46.1
°
)
❘
"\[RightBracketingBar]"
}
(
8
)
I
9
=
I
⁢
max
⁡
(
4
⁢
9
.
0
⁢
0
∼
49.6
°
)
I
⁡
(
49.
°
)
+
0.25
{
❘
"\[LeftBracketingBar]"
I
⁡
(
49.6
°
)
-
I
⁡
(
49.
°
)
❘
"\[RightBracketingBar]"
}
(
9
)
3.05
≤
I
7
+
I
8
+
I
9
(
C
)
wherein, in Formulas (7) to (9), Imax (k to m°) is a maximum value of an X-ray diffraction intensity at a diffraction angle 2θ between k to m°, I (n°) is an X-ray diffraction intensity at a diffraction angle 2θ of n°, and k, m, and n are diffraction angles 2θ each shown in Formulas (7) to (9).

### Claim 3 (depends on 1)

The plated steel sheet according to claim 1, wherein the average chemical composition of the plated layer satisfies 0.01≤Sn, and
when I10 determined from an X-ray diffraction peak of Mg9Sn5 is defined by the following Formula (10) in an X-ray diffraction pattern of a surface of the plated layer, measured under conditions of an X-ray output of 40 kV and 150 mA using a Cu-Kα ray, the following Formula (D) is satisfied:
I
10
=
I
⁢
max
⁡
(
2
⁢
3
.
1
⁢
0
∼
23.8
°
)
I
⁡
(
23.1
°
)
+
0
.
4
⁢
3
⁢
{
❘
"\[LeftBracketingBar]"
I
⁡
(
23.8
°
)
-
I
⁡
(
23.1
°
)
❘
"\[RightBracketingBar]"
}
(
10
)
1.04
≤
I
10
(
D
)
wherein, in Formula (10), Imax (23.10 to 23.80°) is a maximum value of an X-ray diffraction intensity at a diffraction angle 2θ between 23.10 to 23.80°, I (23.10°) is an X-ray diffraction intensity at a diffraction angle 2θ of 23.10°, and I (23.80°) is an X-ray diffraction intensity at a diffraction angle 2θ of 23.80°.

### Claim 4 (depends on 2)

The plated steel sheet according to claim 2, wherein the average chemical composition of the plated layer satisfies 0.01≤Sn, and
when I10 determined from an X-ray diffraction peak of Mg9Sn5 is defined by the following Formula (10) in an X-ray diffraction pattern of a surface of the plated layer, measured under conditions of an X-ray output of 40 kV and 150 mA using a Cu-Kα ray, the following Formula (D) is satisfied:
I
10
=
I
⁢
max
⁡
(
2
⁢
3
.
1
⁢
0
∼
23.8
°
)
I
⁡
(
23.1
°
)
+
0
.
4
⁢
3
⁢
{
❘
"\[LeftBracketingBar]"
I
⁡
(
23.8
°
)
-
I
⁡
(
23.1
°
)
❘
"\[RightBracketingBar]"
}
(
10
)
1.04
≤
I
10
(
D
)
wherein, in Formula (10), Imax (23.10 to 23.80°) is a maximum value of an X-ray diffraction intensity at a diffraction angle 2θ between 23.10 to 23.80°, I (23.10°) is an X-ray diffraction intensity at a diffraction angle 2θ of 23.10°, and I (23.80°) is an X-ray diffraction intensity at a diffraction angle 2θ of 23.80°.

### Claim 5 (depends on 1)

The plated steel sheet according to claim 1, wherein when I11 to I13 determined from X-ray diffraction peaks of a metal oxide are defined by the following Formulas (11) to (13) in an X-ray diffraction pattern of a surface of the plated layer, measured under conditions of an X-ray output of 40 kV and 150 mA using a Cu-Kα ray, the following Formula (E) is satisfied:
I
11
=
I
⁢
max
⁡
(
1
⁢
0
.
3
⁢
0
∼
10.7
°
)
I
⁡
(
10.3
°
)
+
0
.
3
⁢
75
⁢
{
❘
"\[LeftBracketingBar]"
1
⁢
(
10.7
°
)
-
I
⁡
(
10.3
°
)
❘
"\[RightBracketingBar]"
}
(
11
)
I
12
=
I
⁢
max
⁡
(
1
⁢
2
.
3
⁢
0
∼
13.3
°
)
I
⁡
(
12.3
°
)
+
0
.
5
⁢
3
⁢
{
❘
"\[LeftBracketingBar]"
I
⁡
(
13.3
°
)
-
I
⁡
(
12.3
°
)
❘
"\[RightBracketingBar]"
}
(
12
)
I
13
=
I
⁢
max
⁡
(
17.1
∼
17.5
°
)
I
⁡
(
17.1
°
)
+
0
.
6
⁢
5
⁢
{
❘
"\[LeftBracketingBar]"
I
⁡
(
17.5
°
)
-
I
⁡
(
17.1
°
)
❘
"\[RightBracketingBar]"
}
(
13
)
3.04
≤
I
11
+
I
12
+
I
13
(
E
)
wherein, in Formulas (11) to (13), Imax (k to m°) is a maximum value of an X-ray diffraction intensity at a diffraction angle 2θ between k to m°, I (n°) is an X-ray diffraction intensity at a diffraction angle 2θ of n°, and k, m, and n are diffraction angles 2θ each shown in Formulas (11) to (13).

### Claim 6 (depends on 1)

The plated steel sheet according to claim 1, wherein the plated layer contains a Zn phase, an Al phase, an Al—Zn phase, an η′-MgZn2 phase, and a MgZn2 phase.

### Claim 7 (depends on 5)

The plated steel sheet according to claim 5, wherein the plated layer contains a Zn phase, an Al phase, an Al—Zn phase, an η′-MgZn2 phase, and a MgZn2 phase.