(4) Good thermal stability
The shape of the parts of the plastic injection mold is often complicated, and it is difficult to process after quenching. Therefore, materials with good thermal stability should be used as much as possible.
(5) Mirror processing performance
The surface of the cavity is smooth, the molding surface is required to be polished into a mirror surface, and the surface roughness is lower than Ra 0.4 μm to ensure the appearance of the plastic pressed part and facilitate demolding.
(6) Heat treatment performance
In the mold failure accident, the accident caused by heat treatment is generally 52.3%, so that the heat treatment plays an important role in the whole mold manufacturing process, and the quality of the heat treatment process has a great influence on the mold quality. Generally, the heat treatment deformation is small, the quenching temperature range is wide, and the superheat sensitivity is small, in particular, there is a large hardenability and hardenability.
(7) Corrosion resistance
During the forming process, corrosive gas may be released to decompose corrosive gases, such as HC1, HF, etc., and sometimes the mold is rusted and damaged at the air flow passage, so the mold steel is required to have good corrosion resistance.