1. Abrasion resistance. When the blank is plastically deformed in the mold cavity, it flows and slides along the cavity surface, causing severe friction between the cavity surface and the blank, resulting in the failure of the 2K mold due to wear. Therefore, wear resistance is one of the most basic and important properties of molds. In general, the higher the hardness of the 2K mold parts, the smaller the amount of wear and the better the wear resistance. Abrasion resistance is also related to the type, quantity, shape, size and distribution of carbides in the material.

2. Strong toughness. The working conditions of 2K molds are mostly very harsh, and some are often subjected to large impact loads, which can lead to brittle fractures. In order to prevent the 2K mold parts from suddenly brittle during work, the 2K mold should have high strength and toughness. The toughness of the 2K mold mainly depends on the carbon content, grain size and microstructure of the material.

3. Fatigue fracture performance. In the working process of 2K molds, fatigue fracture is often caused by long-term action of cyclic stress. It can be formed in the form of low-energy multiple impact fatigue fracture, tensile fatigue fracture, contact fatigue fracture and bending fatigue fracture. The fatigue fracture properties of 2K molds are mainly determined by their strength, toughness, hardness, and the content of inclusions in the material.

4. High temperature performance. When the working temperature of the 2K mold is high, the hardness and strength will decrease, resulting in early wear or plastic deformation of the mold and failure. Therefore, the 2K mold material should have high anti-tempering stability to ensure that the 2K mold has high hardness and strength at working temperature.

5. Resistance to cold and heat fatigue. Some 2Kr molds are in a state of repeated heating and cooling during the working process, which makes the surface of the cavity under the action of tension and pressure change, causing surface cracking and spalling, increasing friction, hindering plastic deformation, and reducing dimensional accuracy, resulting in the failure of 2K molds. Cold and hot fatigue is one of the main forms of failure of hot work molds, and this kind of molds should have high resistance to cold and heat fatigue.

6. Corrosion resistance. Due to the presence of chlorine, fluorine and other elements in the plastic, strong corrosive gases such as HCI and HF are separated after heating, which erodes the surface of the mold cavity, increases its surface roughness, and aggravates wear and failure. Therefore, in the processing of 2K molds, it is necessary to choose materials with superior corrosion resistance.