Purpose: therefore a kind of preparation method is provided, for the steel alloy and coarse machining that a mold does not forge can be manufactured, the steel alloy for being used for mold is generated, is improved in physical property, such as thermal stability, fatigue strength, wear resistance and castability. Construction a: molten metal comprising by Mo weight by Cr weight by Si weight by Mn weight by the 0. of C weight2 to 0.5%, 0.3 to 1.5%, 0.3 to 1.0%, 3.0 to 8.0%, 1.0 to 2.0%, by total steel alloy Fe and other inevitable element bases V and remaining sum weight 0.7 to 1.5%, it is added by N weight 0.007 to 0.12%, it heats 1,150deg.C points poor 1,100 points and added with by Ce weight 0.05 to 0.01%, by the 0. of Ca weight005 to 0.01% production title steel alloy.
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