Outer plate component for automobile, blank sheet, manufacturing method for blank sheet, and manufacturing facility for blank sheet

A blank sheet which is a material for an outer plate component for an automobile, the blank sheet comprising:

• a steel sheet,
• wherein a rolling direction of the steel sheet extends along a longitudinal direction of the blank sheet, and
• a thickness is 0.6 mm or less,
• wherein the steel sheet contains, as a chemical composition, by mass %,
• C:
• 0.040% to 0.105%,
• Mn:
• 1.00% to 2.30%,
• Si:
• 0.005% to 1.500%,
• Al:
• 0.005% to 0.700%,
• P:
• 0.100% or less,
• S:
• 0.0200% or less,
• N:
• 0.0150% or less,
• O:
• 0.0100% or less,
• Cr:
• 0% to 0.80%,
• Mo:
• 0% to 0.16%,
• Ti:
• 0% to 0.100%,
• B:
• 0% to 0.0100%,
• Nb:
• 0% to 0.060%,
• V:
• 0% to 0.50%,
• Ni:
• 0% to 1.00%,
• Cu:
• 0% to 1.00%,
• W:
• 0% to 1.00%,
• Sn:
• 0% to 1.00%,
• Sb:
• 0% to 0.200%,
• Ca:
• 0% to 0.0100%,
• Mg:
• 0% to 0.0100%,
• Zr:
• 0% to 0.0100%,
• REM:
• 0% to 0.0100%, and
• a remainder:
• Fe and impurities,
• ΔC calculated from C20 that is a C content at a depth position of 20 μm from a surface, C60 that is a C content at a depth position of 60 μm from the surface, and Expression (1) is 0.20 to 0.90 mass %/mm, and
• a tensile strength is 500 MPa or greater,
• ΔC=(C60−C20)/(0.04) (1).