US 12,221,667 B2
Hot-stamping formed body
Hiroyuki Nakagawa, Tokyo (JP); and Hiroki Akutsu, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/609,243
Filed by NIPPON STEEL CORPORATION, Tokyo (JP)
PCT Filed Jul. 2, 2020, PCT No. PCT/JP2020/025986
§ 371(c)(1), (2) Date Nov. 5, 2021,
PCT Pub. No. WO2021/002422, PCT Pub. Date Jan. 7, 2021.
Claims priority of application No. 2019-123334 (JP), filed on Jul. 2, 2019.
Prior Publication US 2022/0213572 A1, Jul. 7, 2022
Int. Cl. C21D 9/46 (2006.01); B21D 22/02 (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); C22C 38/54 (2006.01); C23C 2/06 (2006.01); C23C 2/40 (2006.01)
CPC C21D 9/46 (2013.01) [B21D 22/022 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (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); C22C 38/54 (2013.01); C23C 2/06 (2013.01); C23C 2/40 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A hot-stamping formed body comprising a steel sheet and a film disposed on the steel sheet,
wherein the steel sheet includes, as a chemical composition, by mass %:
C: 0.02% to 0.58%;
Mn: 0.10% to 3.00%;
sol. Al: 0.001% to 1.000%;
Si: 2.00% or less;
P: 0.100% or less;
S: 0.005% or less;
N: 0.0100% or less;
Ti: 0% to 0.200%;
Nb: 0% to 0.200%;
V: 0% to 1.00%;
W: 0% to 1.00%;
Cr: 0% to 1.00%;
Mo: 0% to 1.00%;
Cu: 0% to 1.00%;
Ni: 0% to 1.00%;
B: 0% to 0.0100%;
Ca: 0% to 0.05%;
REM: 0% to 0.05%; and
a remainder comprising Fe and impurities, and
wherein the film is formed by applying a plating adhesion amount of the film of 15.0 g/m2 or more and less than 40.0 g/m2, wherein the film includes, by mass %: Fe: 1.5% to 8.0%; Al: 0.50% to 3.00%; and a balance of Zn and impurities, and
in the film,
in Glow Discharge Optical Emission Spectrometry (GDS) measurement in a region from a surface of the film to a depth position of 100 μm from the surface, Zntotal as a cumulative amount of Zn is 10.0 g/m2 or more and less than 40.0 g/m2,
in GDS measurement in a region from the surface to a peak position of Al, a sum of Zna as a cumulative amount of Zn and a cumulative amount of Mn is 20.0 g/m2 or less and a sum of a cumulative amount of Al, a cumulative amount of Si, and a cumulative amount of Cr is 60 mg/m2 or more and 240 mg/m2 or less,
Zntotal−Zna is 3.0 g/m2 or more and 30.0 g/m2 or less, and
an arithmetic average roughness Ra of the film is less than 1.50 μm.