Patent ID: 11904573
Assignee: NIPPON STEEL CORPORATION
Field: Materials, metallurgy (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 0:
1. A hot-stamped article comprising:
a base steel sheet containing, as chemical components, by mass %,
C: 0.15% or more and less than 0.70%,
Si: 0.005% or more and 0.250% or less,
Mn: 0.30% or more and 3.00% or less,
sol. Al: 0.0002% or more and 0.500% or less,
P: greater than 0% to 0.100%,
S: greater than 0% to 0.1000%,
N: greater than 0% to 0.0100%,
Nb: 0% or more and 0.150% or less,
Ti: 0% or more and 0.150% or less,
Mo: 0% or more and 1.000% or less,
Cr: 0% or more and 1.000% or less,
B: 0% or more and 0.0100% or less,
Ca: 0% or more and 0.0100% or less, and
REM: 0% or more and 0.30% or less
with a remainder including Fe and impurities; and
a plating layer on a surface of the base steel sheet, the plating layer being attached to a single surface in an amount of 10 g/m2 or more and 90 g/m2 or less and having a Ni content of 10 mass % or more and 25 mass % or less with a remainder including Zn and impurities,
wherein a metallographic structure of a surface layer region that is a region from the surface of the base steel sheet to a depth of 50 μm in the base steel sheet includes 80.0% or more of martensite and 8.0% or more of residual austenite in terms of area percentage, and
a concentration of Ni in the surface layer region is 8 mass % or more.