US 12,331,406 B2
Metallic coated steel
Kotaro Ishii, Tokyo (JP); Kohei Tokuda, Tokyo (JP); Yasuto Goto, Tokyo (JP); and Mamoru Saito, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 18/840,411
Filed by NIPPON STEEL CORPORATION, Tokyo (JP)
PCT Filed Feb. 22, 2023, PCT No. PCT/JP2023/006599
§ 371(c)(1), (2) Date Aug. 21, 2024,
PCT Pub. No. WO2023/163075, PCT Pub. Date Aug. 31, 2023.
Claims priority of application No. 2022-025405 (JP), filed on Feb. 22, 2022.
Prior Publication US 2025/0109475 A1, Apr. 3, 2025
Int. Cl. C23C 2/06 (2006.01); C22C 18/00 (2006.01)
CPC C23C 2/06 (2013.01) [C22C 18/00 (2013.01); Y10T 428/12799 (2015.01)] 4 Claims
OG exemplary drawing
 
1. A metallic coated steel comprising:
a steel material; and
a metallic coating layer formed on a surface of the steel material,
wherein the metallic coating layer has an average chemical composition including, in terms of mass %,
Al: 0.2% to less than 4.0%,
Mg: more than 4.0% and less than 12.5%,
Ca: 0.15% to less than 3.00%,
Sn: 0% to less than 3.0%,
Bi: 0% to less than 1.0%,
In: 0% to less than 1.0%,
Sc: 0% to less than 0.50%,
Y: 0% to less than 0.50%,
La: 0% to less than 0.50%,
Ce: 0% to less than 0.50%,
Sr: 0% to less than 0.50%,
Si: 0% to less than 2.50%,
B: 0% to less than 0.50%,
P: 0% to less than 0.50%,
Cr: 0% to less than 0.25%,
Ti: 0% to less than 0.25%,
Ni: 0% to less than 1.0%,
Co: 0% to less than 0.25%,
V: 0% to less than 0.25%,
Nb: 0% to less than 0.25%,
Cu: 0% to less than 1.0%,
Mn: 0% to less than 0.25%,
Mo: 0% to less than 0.25%,
W: 0% to less than 0.25%,
Zr: 0% to less than 0.25%,
Fe: 0% to less than 5.0%,
Ag: 0% to less than 1.0%,
Li: 0% to less than 0.50%,
Na: 0% to less than 0.05%,
K: 0% to less than 0.05%,
Sb: 0% to less than 0.5%,
Pb: 0% to less than 0.5%,
Zn: 65% or more, and
impurities, and
in a cross section of the metallic coating layer in a thickness direction, a metallurgical structure observed in a scanning electron microscope observed visual field contains, in terms of area fraction,
an MgZn2 phase: 10 to 40%,
an Al—Zn phase: 0 to 15%,
an Al phase: 0 to 5%,
a CaZn13 phase: 1.0 to 15.0%, and
a total of a [ternary eutectic structure of Al/MgZn2/Zn] and a [binary eutectic structure of MgZn2/Zn]: 30.0% or more.