(2) Excellent high temperature wear resistance, oxidation resistance and tempering stability
When the high-temperature molten metal is injected into the mold at high speed and demoulded after casting, a large friction effect is generated. To ensure long-term use of the mold, the mold should have high wear resistance at the working temperature. A large number of continuously produced die-casting molds should maintain their high hardness for a long time under a certain temperature, and should not stick to the mold and produce no scale. 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 heated and cooled by high temperature, and continuously expands and contracts to generate alternating thermal stress. When this stress exceeds the elastic limit of the mold material, repeated plastic deformation occurs, causing thermal fatigue. At the same time, the surface of the mold is subject to corrosion and oxidation of molten metal for a long time, and fine cracks are gradually generated. In most cases, thermal fatigue is the most important factor determining the life of the die-casting mold.