Many people feel confused about how to select the right steel grade for own mold. The making of mold always been through forging, cutting, processing, heat treatment, test and more. In order to make sure the quality and cost of mould, the material must have great machinability, hardenability, malleability, and more. And there are several things we need to think about it.
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Wear Resistance
The wear resistance of mold steel is the basic and one of the most important. And the hardness is the main factor for wear resistance. In general, high hardness of die with lower loss, that means the wear resistance is good. At the same time, the wear resistance of mold steel is related to its types, amount, shape of the carbide.
Obdurability
There is so high pressure for the working of mould. It has to suffer big impact load. So it must have great strength and toughness to handle such difficult conditions of working. The toughness of it is depending on the carbon content and texture.
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Fatigue Strength
During the working, the die under so big pressure always would be fatigue fracture. The strength, toughness, hardness and inclusion quantity of material are the factors of fatigue limit.
High-Temperature Property
When the temperature is high in the working time, the hardness and strength of it would get down, which will cause the mold to get plastic deformation then become useless. So the die steel must have high stability of resistance tempering to make sure the mold has high strength and hardness in the high temperature of working time.
Corrosion Resistance
Because plastic has chlorine, fluorine and other elements, the HCI, HF and other etchant gas would come out after the heating and decomposition. That will attack the surface of mould cavity, make the surface become tougher then raise the loss of mold.
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