Steel sheet for hot stamping
A steel sheet for hot stamping includes a steel structure represented by an area fraction of bainite, fresh martensite and tempered martensite: 80% or more in total, and a product of a number density (pieces/μm 2 ) of carbides and a proportion of carbides precipitated into prior austenite grains in carbides: 0.50 or more.
1. A steel sheet for hot stamping comprising
a steel structure comprising
an area fraction of bainite, fresh martensite and tempered martensite: 80% or more in total, and
a product of a number density of carbides, in pieces/μm 2 , and a proportion of carbides precipitated into prior austenite grains in carbides: 0.50 or more and 10 or less.
2. The steel sheet for hot stamping according to claim 1 , wherein a C content is not less than 0.27 mass % nor more than 0.60 mass %.
3. The steel sheet for hot stamping according to claim 1 , wherein a Vickers hardness is 500 Hv or more.
4. The steel sheet for hot stamping according to claim 2 , wherein a Vickers hardness is 500 Hv or more.
5. The steel sheet for hot stamping according to claim 1 , comprising a plating layer.
6. The steel sheet for hot stamping according to claim 2 , comprising a plating layer.
7. The steel sheet for hot stamping according to claim 3 , comprising a plating layer.
8. The steel sheet for hot stamping according to claim 4 , comprising a plating layer.