Hot-stamp formed body

1 . A hot-stamp formed body comprising, as a chemical composition, by mass %:

C: 0.42% to 0.70%;

Si: 0.010% to 1.300%;

Mn: 0.100 to 3.000%;

P: 0.100% or less;

S: 0.0100% or less;

N: 0.0200% or less;

O: 0.0200% or less;

Al: 0.001% to 0.500%;

Cr: 0.010% to 0.800%;

Ti: 0.010% to 0.100%;

Nb: 0.0010% to 0.1000%;

B: 0.0005% to 0.0200%;

Mo: 0% to 1.000%;

Co: 0% to 4.00%;

Ni: 0% to 3.00%;

Cu: 0% to 3.00%;

V: 0% to 1.00%;

W: 0% to 1.00%;

Ca: 0% to 1.0000%;

Mg: 0% to 1.0000%;

REM: 0% to 1.0000%;

Sb: 0% to 1.00%;

Zr: 0% to 1.00%;

Sn: 0% to 1.00%;

As: 0% to 1.0000%; and

a remainder: Fe and impurities,

wherein the hot-stamp formed body has a microstructure including, by area ratio, martensite: 90% to 100% and a remainder in the microstructure: 0% to 10%,

a percentage of martensite having a GAIQ value of 40000 or less in all of the martensite is less than 5.0%,

an average grain size of prior austenite grains is 6.0 μm or less, and

a standard deviation of grain sizes of the prior austenite grains is 2.6 μm or less.

2 . The hot-stamp formed body according to claim 1 ,

wherein the chemical composition contains, by mass %, one or more of:

Mo: 0.001% to 1.000%;

Co: 0.01% to 4.00%;

Ni: 0.01% to 3.00%;

Cu: 0.01% to 3.00%;

V: 0.01% to 1.00%;

W: 0.01% to 1.00%;

Ca: 0.0001% to 1.0000%;

Mg: 0.0001% to 1.0000%;

REM: 0.0001% to 1.0000%;

Sb: 0.001% to 1.00%;

Zr: 0.001% to 1.00%;

Sn: 0.001% to 1.00%; and

As: 0.0001% to 1.0000%.

3 . The hot-stamp formed body according to claim 2 ,

wherein the average grain size of the prior austenite grains is more than 3.0 μm.

4 . The hot-stamp formed body according to claim 1 ,

wherein the average grain size of the prior austenite grains is more than 3.0 μm.