The ex-factory hardness of P20 is HRC30-42. P20 is an American brand pre-hardened plastic die steel, which is suitable for large and medium-sized precision dies and long-term production of high-quality plastic dies and large die sets. This kind of steel has good machinability and can be polished generally.

The whole P20 material has been pre-hardened before the steel leaves the factory, so it is no longer suitable for quenching. P20 material is easy to burst after quenching and can only be nitrided on the surface. The oxidation requirements are surface 0. 1mm and hardness 65-68HRC. The machinability of P20 material is average. When the minimum size of P20 material is greater than 300mm, if there are a lot of wire cutting or EDM processes in the machining process, tempering must be carried out once after the online cutting or EDM is completed.

Characteristics and uses of P20 materials

1, features: uniform hardness, good polishing performance and photoetching performance, and good processability; Vacuum degassing and refining of pure steel is suitable for polishing or etching plastic molds; Pre-hardening supply, can be directly used for mold processing, without re-heat treatment, shortening the construction period; After forging and rolling, the microstructure is dense, and there are no pores and pinholes by 100% ultrasonic detection.

2. Usage: suitable for plastic molds and modules such as TV front shell, telephone, water dispenser and vacuum cleaner; Thermoplastic injection mold, extrusion mold; Thermoplastic blow mold; Main parts of heavy mould. Cold structural parts; It is often used to make TV sets, washing machines, refrigerators, buckets and so on.

Reference to the above content: Baidu Encyclopedia -P20