Steel sheet for hot stamping and hot stamped part

A hot stamped part having a chemical composition comprising, by mass %,

• C:
• 0.40 to 0.70%,
• Si:
• 0.010 to 1.300%,
• Mn:
• 0.60 to 3.00%,
• P:
• 0.100% or less,
• S:
• 0.0100% or less,
• N:
• 0.0200% or less,
• O:
• 0.0200% or less,
• Al:
• 0.0010 to 0.5000%,
• Nb:
• 0.0010 to 0.100%,
• Ti:
• 0.010 to 0.200%,
• B:
• 0.0005 to 0.0200%,
• Cr:
• 0.010 to 0.80%,
• Mo:
• 0.0010 to 1.000%,
• Co:
• 0 to 2.00%,
• Ni:
• 0 to 3.00%,
• Cu:
• 0 to 1.00%,
• V:
• 0 to 1.00%,
• W:
• 0 to 1.000%,
• Ca:
• 0 to 0.010%,
• Mg:
• 0 to 1.000%,
• REM:
• 0 to 1.000%,
• Sb:
• 0 to 1.000%,
• Zr:
• 0 to 1.000%,
• Sn:
• 0 to 1.000%,
• As:
• 0 to 0.100%, and
• balance:
• Fe and impurities, and
• a metallographic structure comprising, by area ratio, at least one of martensite, bainite, and tempered martensite in a total of 90% or more, wherein
• a standard deviation in a hardness distribution of prior austenite grains at a sheet thickness ¼ position is 150 Hv or less.