US 11,913,089 B2
Low-density clad steel sheet having excellent strength and plateability, and manufacturing method therefor
Min-Seo Koo, Gwangyang-si (KR); and Tae-Jin Song, Gwangyang-si (KR)
Assigned to POSCO CO., LTD, Pohang-si (KR)
Appl. No. 17/263,217
Filed by POSCO, Pohang-si (KR)
PCT Filed Jul. 25, 2019, PCT No. PCT/KR2019/009268
§ 371(c)(1), (2) Date Jan. 26, 2021,
PCT Pub. No. WO2020/032446, PCT Pub. Date Feb. 13, 2020.
Claims priority of application No. 10-2018-0091532 (KR), filed on Aug. 7, 2018.
Prior Publication US 2021/0292867 A1, Sep. 23, 2021
Int. Cl. C21D 9/50 (2006.01); B32B 15/01 (2006.01); C21D 9/46 (2006.01); C21D 8/02 (2006.01); C21D 6/00 (2006.01); C22C 38/14 (2006.01); C22C 38/12 (2006.01); C22C 38/08 (2006.01); C22C 38/06 (2006.01); C22C 38/04 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01); C23C 2/02 (2006.01)
CPC C21D 9/50 (2013.01) [B32B 15/013 (2013.01); C21D 6/001 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0273 (2013.01); C21D 9/46 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/08 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C23C 2/02 (2013.01); C23C 2/022 (2022.08); C23C 2/024 (2022.08); C21D 2211/001 (2013.01); C21D 2211/005 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A clad steel sheet, comprising:
a base material; and
a clad material provided on both side surfaces of the base material,
wherein the base material is a ferrite-austenitic duplex steel sheet including, by weight %, C: 0.3-0.7%, Mn: 2.0-9.0%, Al: 4.5-8.0%, and a balance of Fe and inevitable impurities, and
wherein the clad material is ferrite carbon steel including, by weight %, C: 0.0005-0.2%, Mn: 0.05-2.5%, and a balance of Fe and inevitable impurities.