Zinc-plated steel sheet for hot stamping, method of manufacturing zinc-plated steel sheet for hot stamping, and hot-stamping formed body
A zinc-plated steel sheet for hot stamping includes a steel sheet having a predetermined chemical composition and a zinc plating film disposed on the steel sheet. In the zinc plating film, the plating adhesion amount is 15.0 g/m 2 or more and less than 40.0 g/m 2 , the Fe concentration is 1.5 mass % or more and 8.0 mass % or less, the Al content is 100 mg/m 2 or more and 400 mg/m 2 or less, the Al concentration is 0.50 mass % or more and 3.00 mass % or less, and the remainder consists of Zn and impurities.
1 . A zinc-plated steel sheet for hot stamping comprising a steel sheet and a zinc plating 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: 0.28% 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
in the zinc plating film prior to hot stamping,
a plating adhesion amount is 15.0 g/m 2 or more and 30.0 g/m 2 or less,
a Fe concentration is 1.5 mass % or more and 4.7 mass % or less,
an Al content is 100 mg/m 2 or more and 400 mg/m 2 or less,
an Al concentration is 0.50 mass % or more and 3.00 mass % or less, and
a remainder consists of Zn and impurities.
2 . The zinc-plated steel sheet for hot stamping according to claim 1 ,
wherein the chemical composition of the steel sheet includes, by mass %, one or more of:
Ti: 0.005% to 0.200%;
Nb: 0.005% to 0.200%;
V: 0.10% to 1.00%;
W: 0.10% to 1.00%;
Cr: 0.05% to 1.00%;
Mo: 0.05% to 1.00%;
Cu: 0.05% to 1.00%;
Ni: 0.05% to 1.00%;
B: 0.0010% to 0.0100%;
Ca: 0.0005% to 0.05%; and
REM: 0.0005% to 0.05%.
3 . A method of manufacturing the zinc-plated steel sheet for hot stamping according to claim 1 , the method comprising processes that are sequentially performed, the processes including:
a heating process of heating a slab having the chemical composition according to claim 1 at 1200° C. or higher for 5 minutes or longer;
a hot-rolling process of hot-rolling the slab such that a finish rolling temperature is 800° C. or higher and 980° C. or lower and coiling the hot-rolled slab at a coiling temperature of 450° C. or higher and 800° C. or lower to obtain a hot-rolled steel sheet;
a cold-rolling process of pickling the hot-rolled steel sheet and subsequently cold-rolling the hot-rolled steel sheet such that a cumulative rolling reduction is 30% or higher and 80% or lower to obtain a cold-rolled steel sheet; and
a zinc plating process of annealing the cold-rolled steel sheet in a temperature range of 700° C. or higher and 900° C. or lower to obtain a steel sheet and dipping the steel sheet in a molten zinc bath having an Al concentration of 0.155 mass % or more and 0.175 mass % or less for 1.0 second or longer and 15.0 seconds or shorter to form a zinc plating film on the steel sheet.
4 . A method of manufacturing the zinc-plated steel sheet for hot stamping according to claim 2 , the method comprising processes that are sequentially performed, the processes including:
a heating process of heating a slab having the chemical composition according to claim 2 at 1200° C. or higher for 5 minutes or longer;
a hot-rolling process of hot-rolling the slab such that a finish rolling temperature is 800° C. or higher and 980° C. or lower and coiling the hot-rolled slab at a coiling temperature of 450° C. or higher and 800° C. or lower to obtain a hot-rolled steel sheet;
a cold-rolling process of pickling the hot-rolled steel sheet and subsequently cold-rolling the hot-rolled steel sheet such that a cumulative rolling reduction is 30% or higher and 80% or lower to obtain a cold-rolled steel sheet; and
a zinc plating process of annealing the cold-rolled steel sheet in a temperature range of 700° C. or higher and 900° C. or lower to obtain a steel sheet and dipping the steel sheet in a molten zinc bath having an Al concentration of 0.155 mass % or more and 0.175 mass % or less for 1.0 second or longer and 15.0 seconds or shorter to form a zinc plating film on the steel sheet.
5 . A zinc-plated steel sheet for hot stamping comprising a steel sheet and a zinc plating 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: 0.28% 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
in the zinc plating film prior to hot stamping,
a plating adhesion amount is 15.0 g/m 2 or more and 30.0 g/m 2 or less,
a Fe concentration is 1.5 mass % or more and 4.7 mass % or less,
an Al content is 100 mg/m 2 or more and 400 mg/m 2 or less,
an Al concentration is 0.50 mass % or more and 3.00 mass % or less, and
a remainder comprises Zn and impurities.