(1) Higher high-temperature strength and toughness

Die casting molds are prone to deformation and cracking due to the high temperature, high pressure, and thermal stress caused by molten metal injection. Therefore, the mold material should have sufficient high-temperature strength and toughness, as well as high hardness at working temperature.

(2) Excellent high-temperature wear resistance, oxidation resistance, and tempering stability

When high-temperature molten metal is injected into the mold at high speed and demolded after casting, significant friction is generated. To ensure long-term use of the mold, it should have high wear resistance at working temperature. Die-casting molds that are consumed in large quantities continuously and are exposed to a certain temperature for a long time should maintain their high hardness, and should not stick to the mold or produce oxide skin. Therefore, the mold should also have good oxidation resistance and tempering stability.

(3) Good thermal fatigue performance

The surface of the die casting mold is repeatedly subjected to high temperature heating and cooling, occasionally shrinking and producing alternating thermal stress. When this stress exceeds the elastic limit of the mold material, repeated plastic deformation occurs, causing thermal fatigue. Colleague, if the surface of the mold is corroded and oxidized by molten metal for a long time, it will gradually produce fine cracks. In most cases, thermal fatigue is the most important factor determining the lifespan of the die casting mold.

(4) High resistance to melt damage

With the scaling up of die-casting machines, the die-casting pressure is also increasing, from 20-30MPa at low pressure to 150-500MPa at high pressure. High temperature and high pressure casting can cause significant melting damage, and the mold has a strong resistance to this. For this reason, the mold material must have high temperature strength, low affinity for molten metal, and the mold should be marked with low roughness, accompanied by appropriate maintenance layers such as oxidation mode and nitriding layer, without decarburization layer.