Steel sheet and hot-stamp formed body

A steel sheet having a chemical composition comprising, by mass %,

• C:
• 0.27 to 0.60%,
• Si:
• 0.001 to 3.00%,
• Mn:
• 0.30 to 3.00%,
• Al:
• 0.0002 to 2.000%,
• P:
• 0.1000% or less,
• S:
• 0.1000% or less,
• N:
• 0.0100% or less,
• B:
• 0 to 0.0100%,
• Ti:
• 0 to 0.1500%,
• Nb:
• 0 to 0.150%,
• V:
• 0 to 0.150%,
• Mo:
• 0 to 1.00%,
• Cr:
• 0 to 1.0%,
• Cu:
• 0 to 1.000%,
• Ni:
• 0 to 1.00%,
• W:
• 0 to 1.000%,
• Hf:
• 0 to 0.050%,
• Mg:
• 0 to 0.050%,
• Zr:
• 0 to 0.050%,
• Ca:
• 0 to 0.0100%,
• REM:
• 0 to 0.3000%,
• Ir:
• 0 to 1.000%, and
• balance:
• Fe and impurities, wherein
• a depth from a surface in a sheet thickness direction with an area ratio of pearlite of 0 to 20% is 3 to 100 μm, and
• an area ratio of pearlite having a circle equivalent diameter of 5 μm or more at the depth with area ratio of pearlite of 0 to 20% is 0 to 30%.

A hot-stamp formed body having a chemical composition comprising, by mass %,

• C:
• 0.27 to 0.60%,
• Si:
• 0.001 to 3.00%,
• Mn:
• 0.30 to 3.00%,
• Al:
• 0.0002 to 2.000%,
• P:
• 0.1000% or less,
• S:
• 0.1000% or less,
• N:
• 0.0100% or less,
• B:
• 0 to 0.0100%,
• Ti:
• 0 to 0.1500%,
• Nb:
• 0 to 0.150%,
• V:
• 0 to 0.150%,
• Mo:
• 0 to 1.00%,
• Cr:
• 0 to 1.0%,
• Cu:
• 0 to 1.000%,
• Ni:
• 0 to 1.00%,
• W:
• 0 to 1.000%,
• Hf:
• 0 to 0.050%,
• Mg:
• 0 to 0.050%,
• Zr:
• 0 to 0.050%,
• Ca:
• 0 to 0.0100%,
• REM:
• 0 to 0.3000%,
• Ir:
• 0 to 1.000%, and
• balance:
• Fe and impurities, wherein
• a mean C concentration from a surface down to 20 μm in a thickness direction is 0.20 mass %, and
• the hot-stamp formed body comprises, by area ratio, martensite at 90% or more.