NAK80 mold steel is a kind of pre-hardened plastic mold steel with excellent processing properties and polishing properties, which is widely used to manufacture precision, complex and long-life plastic molds. In order to get the most out of the excellent properties of NAK80 die steel, proper heat treatment is essential.
1. Pretreatment of NAK80 die steel.
Before heat treatment, it is necessary to pair:NAK80 die steelPretreatment is carried out to eliminate the stress inside the material and improve the stability of the material. Pretreatment includes annealing and stress relief. In order to eliminate the stress inside the material and improve the plasticity and toughness of the material, annealing is to heat the steel to a certain temperature, hold it for a certain time, and then slowly cool it. Stress relief is to eliminate the residual stress inside the material by heating it to a certain temperature, holding it for a certain period of time, and then cooling it quickly.
2. Heat treatment of NAK80 die steel.
The heat treatment of NAK80 die steel mainly includes two processes: quenching and tempering.
1.Quench. Quenching is the process of heating steel to a certain temperature, holding it for a certain amount of time, and then cooling it rapidly to obtain a martensitic structure. For NAK80 die steel, oil quenching or salt bath quenching process is generally used. During the quenching process, attention needs to be paid to controlling the heating temperature and holding time to ensure a homogeneous martensitic structure. At the same time, the quenching cooling rate also has an important impact on the performance of NAK80 die steel. In order to obtain good hardness and wear resistance, an appropriate cooling rate is required.
2.Tempering. Tempering is the process of heating the quenched steel to a certain temperature, holding it for a certain time, and then cooling it slowly. The purpose of tempering is to eliminate the internal stresses generated during the quenching process and improve the stability and toughness of the material. For NAK80 die steel, the low-temperature tempering process is generally adopted, and the tempering temperature is generally around 150. During the tempering process, attention needs to be paid to controlling the heating temperature and holding time to ensure that good tempering structure and performance are obtained.
3. Effect of heat treatment on the properties of NAK80 die steel.
Heat treatment has a significant impact on the properties of NAK80 die steel. NAK80 die steelThrough a reasonable heat treatment process, its hardness and wear resistance can be improved while maintaining good toughness and plasticity. In addition, heat treatment can improve the corrosion resistance and fatigue resistance of NAK80 die steel, extending its service life.
In short, for the heat treatment of NAK80 die steel, it is necessary to strictly control the process parameters such as heating temperature, holding time and cooling rate to ensure excellent performance and structure. At the same time, it is also necessary to pay attention to the equipment and environment of heat treatment to avoid defects such as surface oxidation and decarburization. The ultimate goal is to give full play to the excellent properties of NAK80 die steel and improve the service life and stability of the mold.