	US 12,247,293 B2
	Hot-dip Zn-based plated steel sheet
Takuya Mitsunobu, Tokyo (JP); Makoto Akahoshi, Tokyo (JP); Hiroshi Takebayashi, Tokyo (JP); and Takehiro Takahashi, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 18/041,919
Filed by NIPPON STEEL CORPORATION, Tokyo (JP)
PCT Filed Aug. 19, 2021, PCT No. PCT/JP2021/030412 § 371(c)(1), (2) Date Feb. 16, 2023, PCT Pub. No. WO2022/080004, PCT Pub. Date Apr. 21, 2022.
Claims priority of application No. 2020-174453 (JP), filed on Oct. 16, 2020.
Prior Publication US 2024/0002991 A1, Jan. 4, 2024
Int. Cl. C23C 2/06 (2006.01); B32B 15/01 (2006.01); C21D 1/74 (2006.01); C21D 1/84 (2006.01); C21D 6/00 (2006.01); C21D 9/46 (2006.01); C22C 18/04 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22F 1/02 (2006.01); C22F 1/16 (2006.01); C23C 2/28 (2006.01)

CPC C23C 2/06 (2013.01) [B32B 15/013 (2013.01); C21D 1/74 (2013.01); C21D 1/84 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 9/46 (2013.01); C22C 18/04 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22F 1/02 (2013.01); C22F 1/165 (2013.01); C23C 2/29 (2022.08)]

16 Claims

1. A hot-dip Zn-based plated steel sheet comprising:

a steel sheet; and

a plating layer formed on at least part of a surface of the steel sheet,

wherein the plating layer has a chemical composition that includes, by mass %,

Al: 6.00% to 35.00%,

Mg: 2.00% to 12.00%,

Ca: 0.005% to 2.00%,

Si: 0% to 2.00%,

Fe: 0% to 2.00%,

Sb: 0% to 0.50%,

Sr: 0% to 0.50%,

Pb: 0% to 0.50%,

Sn: 0% to 1.00%,

Cu: 0% to 1.00%,

Ti: 0% to 1.00%,

Ni: 0% to 1.00%,

Mn: 0% to 1.00%,

Cr: 0% to 1.00%, and

a remainder: Zn and impurities,

the plating layer has an area ratio of a MgZn₂phase in a range of 15% to 60% in a cross section in a thickness direction, and

the MgZn₂phase includes a Ca-based intermetallic compound having a circle equivalent diameter of 0.10 μm or smaller.