1. Wear resistance

When the blank is plastic in the mold cavity, it flows and slides along the surface of the mold cavity.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 speaking, the higher the hardness of die parts, the less the wear, the better the wear resistance.In addition, the wear resistance is also related to the type, quantity, shape, size and distribution of carbides in the material.

2. Strength and toughness

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

3. Fatigue fracture performance

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

4. High temperature performance

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

5. Heat and cold fatigue resistance

Some die in the process of work in the state of repeated heating and cooling, so that the cavity surface under tension, pressure stress, cause surface cracking and peeling, increase friction, resistance to plastic deformation, reduce dimensional accuracy, resulting in mold failure.Hot and cold fatigue is one of the main forms of failure of hot working die.

6. Corrosion resistance

When some molds, such as plastic molds, are working, due to the presence of chlorine, fluorine and other elements in the plastics, HCI, HF and other strong corrosive gases are decomposed and separated after heating, eroding the surface of mold cavity, increasing its surface roughness and aggravating wear failure.