Four kinds of common plastic die steels are introduced

据统计，我国塑料模具钢占全部模具钢的一半以上。合理选择塑料模具钢和热处理工艺，对保证塑料模具质量、延长塑料模具使用寿命、降低生产成本具有重要作用。接下来，小编将介绍四种常见的塑料模具钢，包括P20模具钢。

According to statistics, plastic mold steel accounts for more than half of all mold steel in China. Reasonable selection of plastic mold steel and heat treatment process plays an important role in ensuring the quality of plastic mold, prolonging the service life of plastic mold and reducing production cost. Next, Xiaobian will introduce four common plastic mold steels, including P20 mold steel.

（1）渗碳塑料模具钢

(1) Carburized plastic die steel

渗碳塑料模具钢主要用于冷捏塑料模具。一般要求碳含量低。在钢中加入铬和镍元素可以提高钢的淬透性，对铁素体固溶强化影响不大，而硅元素的含量应尽可能低。这类钢在冷捏后一般需要渗碳、淬火、回火，可使型腔外表面拥有较高的硬度和耐磨性，外表面硬度可达58~62HRC，中间部位韧性好。

Carburized plastic mould steel is mainly used for cold kneading plastic mould. Low carbon content is generally required. Adding chromium and nickel into the steel can improve the hardenability of the steel and has little effect on the solid solution strengthening of ferrite, while the content of silicon should be as low as possible. This kind of steel generally needs carburizing, quenching and tempering after cold kneading, which can make the outer surface of the cavity have high hardness and wear resistance. The hardness of the outer surface can reach 58 ~ 62Hrc and the toughness of the middle part is good.

（2）预硬化塑料模具钢

(2) Pre hardened plastic die steel

预硬化塑料模具钢是钢厂供货时，预先经过热处理，使其达到使用中模具硬度的模具钢。根据模具的工作条件，硬度变化较大，硬度较低的为25~35HRC，较高的为40~50HRC。这样，模具在切割成型后无需热处理就可以直接使用，进而可以避免热处理引起的模具变形和裂纹。

Pre hardening plastic die steel is a kind of die steel that is supplied by the steel factory and heat treated in advance to make it reach the hardness of the die in use. According to the working conditions of the die, the hardness changes greatly. The lower hardness is 25 ~ 35hrc and the higher hardness is 40 ~ 50HRC. In this way, the die can be used directly without heat treatment after cutting and forming, and then the die deformation and crack caused by heat treatment can be avoided.

（3）时效硬化塑料模具钢

(3) Age hardening plastic die steel

时效硬化塑料模具钢的特点是含碳量低，合金化程度高。高温淬火(固溶处理)后，钢处于绵软状态，显微组织为单一过饱和固溶体。如果在较低温度下时效，可以从固溶体中分离出细小分散的金属化合物，这大大提高了模具钢的硬度和强度，并且由这种强化过程引起的尺寸和形状变化小。因此，用这种钢制造模具时，可以先对模具进行固溶处理后再进行机械加工，然后对模具进行时效处理，以获得更高的强度和硬度，保证了模具的尺寸和形状精度。

Age hardening plastic die steel is characterized by low carbon content and high alloying degree. After high temperature quenching (solution treatment), the steel is in a soft state, and the microstructure is a single supersaturated solid solution. If aged at a lower temperature, fine dispersed metal compounds can be separated from the solid solution, which greatly improves the hardness and strength of the die steel, and the size and shape changes caused by this strengthening process are small. Therefore, when making molds with this steel, the molds can be solution treated before machining, and then aging treated to obtain higher strength and hardness and ensure the dimensional and shape accuracy of the molds.

（4）耐腐蚀塑料模具钢

(4) Corrosion resistant plastic die steel

用PVC、聚苯乙烯、ABS等化学腐蚀塑料加阻燃树脂生产塑料制品时，在成型过程中会分出腐蚀性气体，腐蚀模具。因此，要求模具数据需要具有良好的防腐功能。A型耐腐蚀塑料模具钢除了具有突出的耐腐蚀功能外，与P20模具钢等其他类型的塑料模具钢一样，还需要一定的硬度、强度、耐磨性等功能要求。

When using chemical corrosive plastics such as PVC, polystyrene and ABS plus flame retardant resin to produce plastic products, corrosive gases will be separated in the molding process to corrode the mold. Therefore, the mold data is required to have good anti-corrosion function. A-type corrosion-resistant plastic die steel not only has outstanding corrosion-resistant function, but also needs certain functional requirements such as hardness, strength and wear resistance, like P20 die steel and other types of plastic die steel.

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The above is the knowledge brought to you today. Shandong plastic mold steel has focused on the industry for many years and continuously provided users with valuable content. Please continue to pay attention to us for more content: https://www.jnqhmj.com