Steel sheet and method for manufacturing steel sheet

A steel sheet having a component composition including, in mass %,

• C:
• 0.15% to 0.50%,
• Si:
• 0.01% to 1.00%,
• Mn:
• 1.00% to 3.00%,
• P:
• 0% to 0.0200%,
• S:
• 0.0001% to 0.0200%,
• Al:
• 0.001% to 0.100%,
• N:
• 0% to 0.0200%,
• Co:
• 0% to 0.500%,
• Ni:
• 0% to 1.000%,
• Mo:
• 0% to 1.000%,
• Cr:
• 0% to 2.000%,
• O:
• 0% to 0.020%,
• Ti:
• 0% to 0.5000%,
• B:
• 0% to 0.0100%,
• Nb:
• 0% to 0.500%,
• V:
• 0% to 0.500%,
• Cu:
• 0% to 0.500%,
• W:
• 0% to 0.1000%,
• Ta:
• 0% to 0.1000%,
• Sn:
• 0% to 0.0500%,
• Sb:
• 0% to 0.0500%,
• As:
• 0% to 0.0500%,
• Mg:
• 0% to 0.0500%,
• Ca:
• 0% to 0.0500%,
• Zr:
• 0% to 0.0500%, and
• REM:
• 0% to 0.1000%,
• with the remainder being Fe and impurities,
• wherein a metallographic structure has an area fraction of
• 0% to 10.0% of retained austenite and
• 0% to 5.0% of pearlite, ferrite, and bainite in total, with the remaining structure being martensite and tempered martensite,
• wherein a maximum diameter of MnS predicted by extreme value statistics is 30.0 μm or less,
• wherein a surface roughness Ra is 5.0 μm or less, and
• wherein a surface layer has a Vickers hardness of greater than or equal to a tensile strength TS (MPa) of the steel sheet×0.25.