Steel for mold, and mold

A steel for mold, consisting of:

• 0.28 mass %≤C≤0.65 mass %,
• 0.01 mass %≤Si≤0.30 mass %,
• 1.5 mass %≤Mn≤3.0 mass %,
• 0.5 mass %≤Cr≤1.4 mass %,
• 1.9 mass %≤Mo+W/2≤4.0 mass %,
• 0.2 mass %≤V≤1.0 mass %, and
• 0.01≤N≤0.10 mass %,
• optionally,
• Al≤1.5 mass %,
• Ti≤0.5 mass %,
• Nb≤0.5 mass %,
• Zr≤0.5 mass %,
• Ta≤0.5 mass %,
• Co≤1.0 mass %,
• Ni≤1.0 mass %,
• Cu≤1.0 mass %,
• S≤0.15 mass %,
• Ca≤0.15 mass %,
• Se≤0.35 mass %,
• Te≤0.35 mass %,
• Bi≤0.50 mass %, and
• Pb≤0.50 mass %,
• with the balance being Fe and inevitable impurities,
• wherein, in a state after quenching and tempering, the steel comprises:
• a (Mo, W) carbide having a diameter of 0.2 gm or less being in an amount of 1.2 mass % or more,
• a ratio (mass ratio) of the amount of the (Mo, W) carbide to an amount of a Cr carbide being 11 or more, and
• a hardness change of 15 HRC or less.