US 11,898,252 B2
Aluminum-based alloy-plated steel sheet having excellent workability and corrosion resistance, and manufacturing method therefor
Suk-Kyu Lee, Jeollanam-do (KR); Hyeon-Seok Hwang, Jeollanam-do (KR); Myung-Soo Kim, Jeollanam-do (KR); Kwang-Tai Min, Jeollanam-do (KR); and Dae-Young Kang, Jeollanam-do (KR)
Assigned to POSCO, Pohang-si (KR)
Appl. No. 17/786,452
Filed by POSCO, Pohang-si (KR)
PCT Filed Dec. 18, 2020, PCT No. PCT/KR2020/018719
§ 371(c)(1), (2) Date Jun. 16, 2022,
PCT Pub. No. WO2021/125901, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 10-2019-0172300 (KR), filed on Dec. 20, 2019.
Prior Publication US 2023/0026159 A1, Jan. 26, 2023
Int. Cl. C23C 2/12 (2006.01); C22C 21/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C23C 28/00 (2006.01); C23C 2/28 (2006.01)
CPC C23C 2/12 (2013.01) [C22C 21/00 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C23C 2/28 (2013.01); C23C 2/29 (2022.08); C23C 28/345 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An aluminum alloy-plated steel sheet comprising:
a base steel sheet; and
a single alloy-plated layer formed on the base steel sheet,
wherein the alloy-plated layer contains, by wt %, 35 to 50% of Fe, 1 to 20% of Zn, 5% or less of Mn, less than 0.1% of Si, and a balance of Al and unavoidable impurities, and
a ratio of an area occupied by the base steel sheet in a region from a surface roughness center line of the alloy-plated layer to 3/4t is 30% or more, where t is a distance from the surface roughness center line of the alloy-plated layer to the lowest line of the alloy-plated layer.