Wear-resistant steel plate and method for producing same

A wear-resistant steel plate, comprising

• a chemical composition containing, in mass %,
• C:
• 0.10% or more and 0.23% or less,
• Si:
• 0.05% or more and 1.00% or less,
• Mn:
• 0.10% or more and 2.00% or less,
• P:
• 0.050% or less,
• S:
• 0.050% or less,
• Al:
• 0.050% or less,
• Cr:
• 1.00% or more and 5.00% or less,
• N:
• 0.0100% or less, and
• O:
• 0.0100% or less,
• with the balance being Fe and inevitable impurities, wherein
• the chemical composition satisfies the formula (1)
• 1.00≤0.45Cr+Mo≤2.25 (1),
• where the element symbol in the formula (1) is a content of each element in mass %, and a content of an element that is not contained is 0, and
• a microstructure wherein
• a volume fraction of martensite at a depth of 1 mm from a surface of the steel plate is 95% or more, and
• at a depth of 1 mm from a surface of the steel plate, a Vickers hardness at 400° C. is 288 or more, and a Brinell hardness at 25° C. is 360 HBW10/3000 to 490 HBW10/3000.