1. Wear resistance

When the blank is plastic denudation in the mold cavity, it flows and slides along the cavity surface, causing severe friction between the cavity surface and the blank, which leads to the failure of the mold due to wear. So the wear resistance of the material is one of the most basic and important properties of the mold.

Hardness is the main factor affecting wear resistance. Generally, the higher the hardness of the mold parts, the smaller the amount of wear, wear resistance is also better. In addition, the wear resistance is also related to the type, amount, shape, size and distribution of carbides in the material.

2. Strength and toughness

Most of the working conditions of the die are very bad, some of them often bear a large impact load, which leads to brittle fracture. In order to prevent die parts from breaking suddenly when working, the die should have high strength and toughness. The toughness of the mould mainly depends on the carbon content, grain size and microstructure of the material.

3. Fatigue fracture performance

In the process of die working, fatigue fracture is often caused by the long-term action of cyclic stress. It has the forms of multiple impact fatigue fracture of small energy, contact fatigue fracture of tensile fatigue fracture and bending fatigue fracture. The fatigue fracture performance of the die mainly depends on its strength, toughness, hardness, and the content of inclusions in the material.

4. High temperature performance

When the working temperature of the mold is higher, the hardness and strength will decrease, resulting in early mold wear or plastic deformation and failure. Therefore, the mold material should have a high tempering stability, to ensure that the mold in the working temperature, has a high hardness and strength.

5. Resistance to cold and heat fatigue

Some moulds are in the state of repeated heating and cooling in the working process, which causes the surface of the cavity to be pulled and stressed by pressure, causing the surface to crack and peel off, increasing the friction force, preventing the plastic deformation, reducing the dimensional precision and leading to the failure of the mould. Cold and hot fatigue is one of the main forms of hot die failure.

6. Corrosion resistance

Some molds, such as the plastic mold, work because of the presence of chlorine, fluorine and other elements in the plastic, hot decomposition of HCI, HF and other strong erosive gas, erosion of the mold cavity surface, increase its surface roughness, increase wear failure.

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