US 12,215,411 B2
Coated steel member, coated steel sheet, and methods for producing same
Shinichiro Tabata, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Filed by NIPPON STEEL CORPORATION, Tokyo (JP)
Filed on Jul. 6, 2023, as Appl. No. 18/348,163.
Application 18/348,163 is a division of application No. 17/776,184, granted, now 11,827,964, previously published as PCT/JP2020/043344, filed on Nov. 20, 2020.
Claims priority of application No. 2019-211299 (JP), filed on Nov. 22, 2019.
Prior Publication US 2023/0349030 A1, Nov. 2, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C22C 38/54 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C23C 2/12 (2006.01); C23C 2/26 (2006.01); C23C 2/28 (2006.01); C23C 2/40 (2006.01)
CPC C22C 38/54 (2013.01) [C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 9/46 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C23C 2/12 (2013.01); C23C 2/26 (2013.01); C23C 2/28 (2013.01); C23C 2/29 (2022.08); C23C 2/40 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A coated steel sheet comprising:
a steel sheet containing, as a chemical composition, by mass %,
C: 0.25% to 0.65%,
Si: 0.10% to 1.00%,
Mn: 0.30% to 1.00%,
P: 0.050% or less,
S: 0.0100% or less,
N: 0.010% or less,
Ti: 0.010% to 0.100%,
B: 0.0005% to 0.0100%,
Nb: 0.02% to 0.10%,
Mo: 0.10% to 1.00%,
Cu: 0.15% to 1.00%,
Ni: 0.05% to 0.25%,
Cr: 0% to 1.00%,
V: 0% to 1.00%,
Ca: 0% to 0.010%,
Al: 0% to 1.00%,
Sn: 0% to 1.00%,
W: 0% to 1.00%,
Sb: 0% to 1.00%,
Zr: 0% to 1.00%,
REM: 0% to 0.30%, and
a remainder consisting of Fe and impurities;
a coating on a surface of the steel sheet and containing Al; and
a boundary portion formed between the steel sheet and the coating,
wherein a maximum Cu content of the boundary portion is 80% or more of an average Cu content of the steel sheet.