Hot-rolled steel sheet

A hot-rolled steel sheet comprising, as a chemical composition, by mass %:

• C:
• 0.030% to 0.250%;
• Si:
• 0.05% to 2.50%;
• Mn:
• 1.00% to 4.00%;
• Sol. Al:
• 0.001% to 2.000%;
• P:
• 0.100% or less;
• S:
• 0.0200% or less;
• N:
• 0.01000% or less;
• Ti:
• 0% to 0.20%;
• Nb:
• 0% to 0.20%;
• B:
• 0% to 0.010%;
• V:
• 0% to 1.0%;
• Cr:
• 0% to 1.0%;
• Mo:
• 0% to 1.0%;
• Cu:
• 0% to 1.0%;
• Co:
• 0% to 1.0%;
• W:
• 0% to 1.0%;
• Ni:
• 0% to 1.0%;
• Ca:
• 0% to 0.01%;
• Mg:
• 0% to 0.01%;
• REM:
• 0% to 0.01%;
• Zr:
• 0% to 0.01%;
• and
• a remainder comprising Fe and impurities,
• wherein, when a height profile of a surface of the hot-rolled steel sheet is measured in each of five measurement ranges in a rolling direction and a direction perpendicular to the rolling direction, a distance in a height direction from an average height position which is an average of a height position of a point having a highest height position and a height position of a recessed part which is a point having a lowest height position to the recessed part is indicated as R1 (μm) in each of the height profiles, and a distance in a height direction from the average height position to an average of height positions of two measurement points away from the recessed part in the rolling direction or the direction perpendicular to the rolling direction by 5 μm is indicated as R2 (μm), an average value of radii of curvature r represented by Expression (1) is 10 μm or more,
• a tensile strength of the hot-rolled steel sheet is 500 MPa or more, and
• when the recessed part in which the R1 is 10 μm or more is referred to as a scale damage portion, an area ratio of the scale damage portion is 30% or less,
• r=(25+|R2−R1|2)/2|R2−R1| (1).