STEEL SHEET, MEMBER, AND METHODS FOR PRODUCING SAME

摘要

The purpose of the present invention is to provide: a steel sheet having high strength and excellent shape uniformity and delayed fracture resistance; a member; and methods for producing the same.　A steel sheet according to the present invention has a steel structure comprising, by area ratio, 20-100% of martensite, 0-80% of ferrite, and 5% or less of the remainder, wherein: the residual stress at the sheet width center is 800 MPa or less when a V-shaped bending process is performed; the residual stress at the sheet width edge with respect to the residual stress at the sheet width center is 90-110% when the V-shaped bending process is performed; and when the steel sheet is cut with a length of 1 m in the longitudinal direction thereof, the maximum warpage of the steel sheet is at most 15 mm.