Steel Plate

Abstract: This steel plate has a prescribed chemical composition and has a microstructure containing, in terms of area ratio, 5.0% or less of ferrite and over 90.0% in total of martensite and tempered martensite, the balance being one or more of bainite, pearlite, and retained austenite. In a cross-section taken along the plate thickness direction, regions in which the Mn content is 1.1×[Mnave] or greater are present such that the number density of said regins is 5.0×10-4/µm2 or greater and such that the spacing in relation to the nearest other region in which the Mn content is 1.1×[Mnave] or greater is, on average, 10.0 µm or less, where [Mnave] is the average of the Mn content in the entirety of the plate thickness direction. The steel plate has a tensile strength of 1,500 MPa or greater.

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