High strength member, method for manufacturing high strength member, and method for manufacturing steel sheet for high strength member

A high strength member comprising a bending ridge line portion formed from a steel sheet,

• wherein the steel sheet has a chemical composition containing, by mass %,
• C:
• 0.17% or more and 0.35% or less,
• Si:
• 0.001% or more and 1.2% or less,
• Mn:
• 0.9% or more and 3.2% or less,
• P:
• 0.020% or less,
• S:
• 0.0010% or less,
• Al:
• 0.010% or more and 0.20% or less,
• N:
• 0.010% or less, and a balance of Fe and incidental impurities, and
• a microstructure, in which a total area fraction of one or both of bainite containing carbides having an average grain size of 50 nm or less and martensite containing carbides having an average grain size of 50 nm or less is 90% or more, and
• the member having
• a tensile strength of 1470 MPa or higher,
• a residual stress of 300 MPa or lower in an end surface of the bending ridge line portion, and
• a Vickers hardness (HV) of 200 or higher and 450 or lower in the end surface of the bending ridge line portion.