The invention relates to hot-work die steel and its manufacturing method. It includes the following alloying element: 0.40-0.48wt% C, 0.60-1.00wt% Si, 0.30-0.80wt% Mn, less than 0.030wt% P, S, 2.20-2.70wt% Cr, 0.90-1.20wt% W, 0.80-1.00wt% Mo, 0.70-1.00wt% V, rest Fe and impurity. The method includes the following steps: adopting common steel facility, common medium steel smelting technology to smelt as the given constituent; forging; heat processing; making hot-work die. It has the advantages of reasonable alloy element composition, simplifying technology, lowering the cost. And it is fit for making tool die at 400-650 degree centigrade, such as cutting edge etc. |