US 12,241,161 B2
Aluminum-zinc alloy plated steel sheet having excellent hot workability and corrosion resistance, and method for manufacturing same
Suk-Kyu Lee, Gwangyang-si (KR); Il-Jeong Park, Gwangyang-si (KR); and Myung-Soo Kim, Gwangyang-si (KR)
Assigned to POSCO CO., LTD, Gyeongsangbuk-Do Pohang-si (KR)
Appl. No. 17/271,345
Filed by POSCO CO., LTD, Pohang-si (KR)
PCT Filed Aug. 23, 2019, PCT No. PCT/KR2019/010795
§ 371(c)(1), (2) Date Feb. 25, 2021,
PCT Pub. No. WO2020/045905, PCT Pub. Date Mar. 5, 2020.
Claims priority of application No. 10-2018-0102602 (KR), filed on Aug. 30, 2018.
Prior Publication US 2021/0348257 A1, Nov. 11, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. B32B 15/01 (2006.01); C22C 21/10 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C23C 2/02 (2006.01); C23C 2/12 (2006.01); C23C 2/20 (2006.01); C23C 2/28 (2006.01); C23C 2/40 (2006.01)
CPC C23C 2/12 (2013.01) [B32B 15/012 (2013.01); C22C 21/10 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C23C 2/02 (2013.01); C23C 2/20 (2013.01); C23C 2/28 (2013.01); C23C 2/40 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An Al—Zn alloy plated steel sheet having workability and corrosion resistance, the Al—Zn alloy plated steel sheet comprising an Al—Zn hot-dip aluminized plating layer on a base steel sheet,
wherein the plating layer comprises:
a lower-layer portion comprising, based on a weight thereof:
Fe: 40% to 50%,
Al: 50% to 60%,
Si: 1% or less, and
inevitable impurities; and
an upper-layer portion comprising, based on a weight thereof:
Zn: 10% to 30%,
Al: 69.8 to 90%, and
the balance of 0.05% or less of one or more impurities selected from the group consisting of Cr, Mo, and Ni;
wherein an amount of Si, if present, in the lower-layer portion is the same as or greater than an amount of Si, if present, in the upper-layer portion; and
wherein the upper-layer portion has a thickness which is 30% or less of a total thickness of the plating layer.