US 12,221,700 B2
High-strength aluminum coated steel sheet having excellent anti-corrosion properties and weldability, and manufacturing method thereof
Suk-Kyu Lee, Gwangyang-si (KR); Jong-Gi Oh, Gwangyang-si (KR); and Myung-Soo Kim, Gwangyang-si (KR)
Assigned to POSCO CO., LTD, Pohang-si (KR)
Appl. No. 18/266,269
Filed by POSCO CO., LTD, Pohang-si (KR)
PCT Filed Dec. 15, 2021, PCT No. PCT/KR2021/019043
§ 371(c)(1), (2) Date Jun. 8, 2023,
PCT Pub. No. WO2022/131779, PCT Pub. Date Jun. 23, 2022.
Claims priority of application No. 10-2020-0178157 (KR), filed on Dec. 18, 2020.
Prior Publication US 2024/0026514 A1, Jan. 25, 2024
Int. Cl. C23C 2/02 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); C22C 21/10 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C23C 2/00 (2006.01); C23C 2/12 (2006.01); C23C 2/40 (2006.01)
CPC C23C 2/02 (2013.01) [C21D 8/0273 (2013.01); C21D 9/46 (2013.01); C22C 21/10 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C23C 2/022 (2022.08); C23C 2/12 (2013.01); C23C 2/40 (2013.01); C23C 2/522 (2022.08); C21D 2211/001 (2013.01); C21D 2211/005 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An aluminum coated steel sheet, comprising:
an austenitic base steel sheet including at least 70 area % of an austenite microstructure and an aluminum coating layer formed on the base steel sheet,
wherein the base steel sheet includes at least 80 area % of ferrite in a surface layer portion, which denotes a region extending from an interface with the coating layer to a depth of 100 μm into the base steel sheet, and
the aluminum coating layer has a composition including 0.7 to 5 wt % of Si, 1.5 to 15 wt % of Zn, and 0.1 to 1.5 wt % of Mn, with balance being Al and inevitable impurities.