Which of the two types of mold steel, NAK80 and H13, is used for plastic narrowing?
1. NAK80 mold steel is a pre hardened plastic mold steel. It has excellent polishing performance and carving ability. After solid solution treatment, it becomes soft and can be cold processed. After being made into a mold, it undergoes aging treatment to ensure its usability and reduce heat treatment deformation.
2. P20 and NAK80 are not the same type of steel. P20 is the American grade, corresponding to the Japanese grade PX5, NAK80 is the Japanese grade, corresponding to the American grade P21. Under normal circumstances, the hardness of P20 is HRC28-32 degrees, and the hardness of NAK80 is HRC38-42 degrees. In addition, the polishing performance of NAK80 is better than P20.
3. NAK80 is a pre hardened mirror polished plastic mold steel. S136 is an air type stainless steel without hardness, and a mirror polished plastic mold steel with corrosion and rust resistance. The hardness is different. NAK80 is a pre hardened mold steel with a factory hardness of HRC38-41.
4. X40CrMoV51 hot working steel has good toughness and ductility, excellent cutting and polishing properties, can resist temperature fusion and thermal stress fatigue, and is stable in size and not easily deformed after heat treatment. It has excellent red hardness. 2344 steel is suitable for general metal die-casting, extrusion molds, and compound molds. PA, POM, PS, PE, EP plastic molds. Hot work mold steel is suitable for aluminum, zinc, and alloy die-casting molds.
What are the types of quenching processes for NAK80 mold steel?
1. Conventional spheroidizing annealing: annealing temperature is 780-810 ℃, and the cooling rate is slowly reduced to ≤ 650 ℃ with the furnace at a cooling rate of 25 ℃/hour. The heat treatment time of this process is more than 20 hours, and the uneven particles of carbides after annealing will affect the subsequent cold work and the final quenching and tempering structure and properties.
2. Heat treatment processes such as normalizing, quenching, and tempering can improve the hardness and wear resistance of NAK80, and the surface treatment of NAK80 can also affect its wear resistance. The specific chemical composition of NAK80 is C: 10-20, Si: 10-40, Mn: 30-60, Cr: 80-30, Mo: 20-40, Ni: 30-50.
3. The heat treatment process of Nak80 mold steel mainly includes three steps: annealing, quenching, and tempering. Firstly, the annealing process. Annealing is to eliminate the internal stress of mold steel, improve its machinability and plasticity. The annealing temperature is generally 780-820 ℃, the holding time is 2-4 hours, and then cooled to room temperature.
4. The heat treatment of NAK80 mold steel is generally divided into two categories: preliminary heat treatment and final heat treatment. The heat treatment that achieves the final performance of the steel piece is called final heat treatment, such as quenching and tempering; The heat treatment that prepares the structure or properties for the final heat treatment is called preparatory heat treatment, such as annealing, normalizing, etc.
5. Abstract: NAK80 steel belongs to Ni Al Cu age hardening steel, which is a high-performance and high-precision high-grade mirror plastic mold steel. Characteristics of plastic mold steel NAK80: It has good mirror processing and discharge processing properties.
6. Therefore, it is commonly used in injection molding molds. In addition to excellent weldability, it is also suitable for mold processing such as texture processing and mirror processing. On the other hand, it has age hardening characteristics (precipitation hardening), so it cannot be quenched or tempered. NAK8NAK80, like NAK55, is also a pre hardened steel for the SCM series sold by Datong Special Steel.
