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What is The Best Mold Steel for PPSU High-temperature and High-pressure Injection Molds?

PPSU (polyphenylsulfone), as a high-performance engineering plastic, has become the preferred material for many high-end products due to its excellent heat resistance, chemical resistance, impact resistance, and wear resistance. Especially in the fields of automotive, medical, electronics, etc., PPSU products are highly favored for their excellent performance. However, to successfully produce high-quality PPSU products, it is crucial to choose the appropriate mold steel, especially in the high-temperature and high-pressure injection molding process.

PPSU material has a high thermal deformation temperature, usually above 180 ℃, and needs to withstand the huge impact force during high-pressure injection molding. Therefore, mold steel must have good high temperature resistance, high strength, high hardness, and excellent corrosion resistance to ensure the stability and durability of molds in high temperature and high pressure environments. In addition, the mirror polishing effect, wear resistance, and toughness of mold steel are also key factors determining the quality of PPSU products.

For the special requirements of PPSU high-temperature and high-pressure injection molds, the following types of mold steel materials are recommended:

1.Hot work mold steel: such as H13 (1.2344) and 2344 steel, which have excellent heat resistance and wear resistance, can maintain stable hardness and strength at high temperatures, and are ideal choices for manufacturing PPSU injection molds. H13 steel has been widely used in the field of mold manufacturing due to its high toughness, high resistance to thermal fatigue, and good polishing properties.

2.Stainless steel mold steel: such as S136 steel (1.2083), which belongs to martensitic stainless steel, has excellent corrosion resistance and heat resistance, and is suitable for manufacturing molds that require high chemical resistance and high temperature resistance. S136 steel can effectively resist the corrosion of chemical substances such as acid and alkali that may be encountered during PPSU injection molding, ensuring the longevity of the mold.

3.High speed steel: such as W18Cr4V and W6Mo5Cr4V2, although high-speed steel is mainly used for manufacturing cutting tools, its excellent heat resistance and wear resistance also make it an alternative material for manufacturing PPSU injection molds under specific conditions. However, it should be noted that the toughness of high-speed steel is relatively poor, and the specific usage environment and mold design requirements need to be comprehensively considered when selecting.

When choosing the mold steel for PPSU high-temperature and high-pressure injection molds, in addition to considering the material's heat resistance, corrosion resistance, wear resistance, and toughness, it is also necessary to pay attention to factors such as mold manufacturing cost, processing performance, and reliability. For example, although P20 steel and 718 steel also have good cutting performance and heat treatment performance, they may be slightly lacking in high temperature resistance and wear resistance, and are suitable for occasions with slightly lower requirements for mold performance.