Steel for mold and mold

The present invention relates to a steel for a mold containing 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%, with the remainder being Fe and unavoidable impurities. In a state of after quenching and tempering, the steel has 1.2 mass% or more of (Mo, W) carbides having a diameter of 0.2 [mu] m or less, the ratio (mass ratio) of the amount of (Mo, W) carbides to the amount of Cr carbides being 11 or more, and the change in hardness is 15 HRC or less. 本发明涉及一种模具用钢，包含：0.28质量％≤C≤0.65质量％，0.01质量％≤Si≤0.30质量％，1.5质量％≤Mn≤3.0质量％，0.5质量％≤Cr≤1.4质量％，1.9质量％≤Mo+W/2≤4.0质量％，0.2质量％≤V≤1.0质量％，和0.01≤N≤0.10质量％，余量为Fe和不可避免的杂质，其中在淬火和回火后的状态下，所述钢具有：1.2质量％以上的直径为0.2μm以下的(Mo，W)碳化物，(Mo，W)碳化物的量与Cr碳化物的量之比(质量比)为11以上，并且硬度变化为15HRC以下。