Steel sheet and member, and methods for manufacturing same

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

• C:
• 0.10% or more and 0.33% or less;
• Si:
• 0.01% or more and 0.50% or less;
• Mn:
• 0.40% or more and 1.25% or less;
• P:
• 0.03% or less;
• S:
• 0.01% or less;
• sol. Al:
• 0.10% or less;
• N:
• 0.01% or less;
• Cr:
• 0.50% or more and 1.50% or less;
• and
• a balance being Fe and incidental impurities,
• wherein the steel sheet has a microstructure containing ferrite and carbides, a ratio of a volume of the ferrite and the carbides to a volume of an entire microstructure is 90% or more, and a ratio of a volume of proeutectoid ferrite to the volume of the entire microstructure is in a range of 20% or more and 80% or less,
• a Mn concentration in the carbides is in a range of 0.10 mass % or more and 0.50 mass % or less, and
• a ratio of a number of carbides with particle diameters of 1 μm or more to a total number of carbides is in a range of 30% or more and 60% or less.