	US 11,787,156 B2
	Coated steel material
Mamoru Saito, Tokyo (JP); Yasuto Goto, Tokyo (JP); and Kiyokazu Ishizuka, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/771,012
Filed by NIPPON STEEL CORPORATION, Tokyo (JP)
PCT Filed Oct. 16, 2020, PCT No. PCT/JP2020/039183 § 371(c)(1), (2) Date Apr. 22, 2022, PCT Pub. No. WO2021/095442, PCT Pub. Date May 20, 2021.
Claims priority of application No. 2019-205998 (JP), filed on Nov. 14, 2019.
Prior Publication US 2022/0371302 A1, Nov. 24, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. B32B 15/01 (2006.01); C22C 18/04 (2006.01); C23C 2/06 (2006.01); C23C 2/40 (2006.01); C23C 28/02 (2006.01); C23C 2/02 (2006.01); C23C 2/26 (2006.01); C23C 2/28 (2006.01); C23C 30/00 (2006.01); C22C 18/00 (2006.01); B32B 15/18 (2006.01); C23C 28/00 (2006.01); B32B 15/04 (2006.01)

CPC B32B 15/013 (2013.01) [B32B 15/04 (2013.01); B32B 15/043 (2013.01); B32B 15/18 (2013.01); C22C 18/00 (2013.01); C22C 18/04 (2013.01); C23C 2/02 (2013.01); C23C 2/024 (2022.08); C23C 2/0222 (2022.08); C23C 2/0224 (2022.08); C23C 2/06 (2013.01); C23C 2/26 (2013.01); C23C 2/28 (2013.01); C23C 2/29 (2022.08); C23C 2/40 (2013.01); C23C 28/02 (2013.01); C23C 28/021 (2013.01); C23C 28/023 (2013.01); C23C 28/025 (2013.01); C23C 28/3225 (2013.01); C23C 30/00 (2013.01); C23C 30/005 (2013.01); Y10T 428/12792 (2015.01); Y10T 428/12799 (2015.01); Y10T 428/12951 (2015.01); Y10T 428/12958 (2015.01); Y10T 428/12972 (2015.01); Y10T 428/12979 (2015.01); Y10T 428/24967 (2015.01); Y10T 428/24975 (2015.01); Y10T 428/263 (2015.01); Y10T 428/264 (2015.01); Y10T 428/265 (2015.01)]

4 Claims

1. A coated steel material comprising a base steel, and a coating layer containing a Zn—Al—Mg alloy layer disposed on a surface of the base steel,

wherein the coating layer has a chemical composition formed from, in % by mass:

Zn: greater than 65.0%,

Al: greater than 5.0% to less than 25.0%,

Mg: greater than 3.0% to less than 12.5%,

Sn: 0 to 0.20%,

Bi: 0% to less than 5.0%,

In: 0% to less than 2.0%,

Ca: 0% to 3.0%,

Y: 0% to 0.5%,

La: 0% to less than 0.5%,

Ce: 0% to less than 0.5%,

Si: 0% to less than 2.5%,

Cr: 0% to 0.25%,

Ti: 0% to 0.25%,

Ni: 0% to 0.25%,

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 less than 0.5%,

Sb: 0% to less than 0.5%,

Pb: 0% to less than 0.5%,

B: 0% to less than 0.5%, and

impurities, and

wherein, in a backscattered electron image of the Zn—Al—Mg alloy layer that is obtained at a time of observing a surface of the Zn—Al—Mg alloy layer, after polishing the Zn—Al—Mg alloy layer such that a layer thickness thereof is reduced by one-half, under a scanning electron microscope at a magnification of 100×, Al crystals are present, and an average value of a cumulative circumferential length of the Al crystals, as determined by binarization image processing and shape characterization measurement, is 88 to 195 mm/mm².