Abstract: H13 die steel as aluminum profile molding mold is often corroded by high temperature aluminumliquid failure.The effects of salt bath nitriding+oxidation and QPQ treatment on the corrosive properties of H13 die steel were studied.The microstructure of the samples before and after treatment was analyzed using SEM and XRD, and the hardness changes of the aluminum layer before and after corrosion were analyzed using a Vicker hardness meter.The results show that the dense Fe₃O₄ oxide layer and nitride layer are formed on the surface of the sample after the two treatments.After high temperature liquid aluminum corrosion, the hardness of the matrix and nitride layer decreases to a certain extent.However, the hardness of the nitriding layer (600.9 HV0.1)is still about 1 times higher than the hardness of the substrate (301.8 HV0.1).After corrosion, the dense oxide membrane on the sample surface remains present.And the weight loss rate of aluminum liquid decreases by more than 90%, it shows that the corrosion resistance of the samples obtained from both surface treatments is good.At the same time, salt bath+oxidation process to optimize the hardness and aluminum liquid corrosion resistance of H13 steel are more obvious.