随着塑料制品在工业及日常生活中的应用越来越广泛，塑料模具工业对模具钢的需求也越来越大。下面山东塑料模具钢厂家来讲讲讲解常用模具钢的类别及特性内容吧。

With the application of plastic products in industry and daily life more and more widely, the demand of plastic mold industry for mold steel is also growing. Next, Shandong plastic mold steel manufacturers will talk about the categories and characteristics of common mold steel.

1.渗碳钢

1. Carburizing steel

渗碳钢由于退火后的硬度低、塑性好，可以采用冷挤压法成型，从而提高工效,减低成本。挤压复杂型腔时，退火后的硬度小于100HBS；挤浅型腔时，小于160HBS，挤压成型后，经渗碳、淬火和回火处理，表面硬度为53～62HRC。

Due to the low hardness and good plasticity after annealing, the carburized steel can be formed by cold extrusion, thus improving the work efficiency and reducing the cost. When extruding complex cavities, the hardness after annealing is less than 100HBS; When extruding shallow cavity, it is less than 160HBS. After extrusion forming, the surface hardness is 53~62HRC after carburizing, quenching and tempering.

达到表面耐磨性高，心部韧性好的要求。08Cr4NiMoV（LJ）是国内开发的冷挤压成型专用钢，具有成型性能优良、渗碳层深、热处理变形小、耐磨性好等优点。其淬火处理的佳温度是850℃，回火温度可视模具工作条件选择。

It meets the requirements of high surface abrasion resistance and good toughness of the core. 08Cr4NiMoV (LJ) is a special steel for cold extrusion molding developed in China, which has the advantages of excellent molding performance, deep carburizing layer, small heat treatment deformation, and good wear resistance. The best quenching temperature is 850 ℃, and the tempering temperature can be selected according to the working conditions of the die.

2.调质型模具钢

2. Quenched and tempered die steel

工艺要求是在完成模具机械加工后，再进行调质处理，使模具达到较好的综合机械性能。一类是45、55等优碳素钢，适宜于形状简单或精度要求不高、使用寿命不长的模具。

The process requirement is to conduct quenching and tempering treatment after the completion of die machining to make the die achieve better comprehensive mechanical properties. The first type is 45, 55 and other high-quality carbon steel, which is suitable for moulds with simple shape, low precision requirements and short service life.

可以选用SM45、SM55等塑料模具专用钢（YB/T094—1997、YB/T107—1997、YB/T129—1997），此钢材的纯净度好,力学性能稳定。另一类是合金钢，可以在调质后进行碳氮共渗，进一步提高耐磨性和抗蚀性。

Special steel for plastic mould such as SM45 and SM55 (YB/T094-1997, YB/T107-1997, YB/T129-1997) can be selected. The steel has good purity and stable mechanical properties. The other is alloy steel, which can be carbonitrided after quenching and tempering to further improve the wear resistance and corrosion resistance.

其中：40CrMo有良好的低温韧度和低的缺口敏感性，适于制作中型模具。42CrMo属于高强度钢，且有较高的疲劳极限，低温韧性好，适于制造要求一定强度和韧性的大、中型塑料模具。

Among them, 40CrMo has good low temperature toughness and low notch sensitivity, which is suitable for making medium-sized molds. 42CrMo is a high-strength steel with high fatigue limit and good low-temperature toughness. It is suitable for manufacturing large and medium-sized plastic molds that require certain strength and toughness.

38CrMoA1是典型的渗碳钢，调质后渗氮处理，表面硬度高（大于850HV）并具有一定的抗蚀性。适用于PVC，PC的塑料模具。此外5CrNiMo、5CrMnMo等热作模具钢，在塑料模具中主要用于使用温度较高，耐磨性要求高的模具，如热固性塑料模。

38CrMoA1 is a typical carburizing steel. After quenching and tempering, it is nitrided, with high surface hardness (more than 850HV) and certain corrosion resistance. Suitable for PVC, PC plastic mold. In addition, 5CrNiMo, 5CrMnMo and other hot work die steels are mainly used in plastic moulds for moulds with high temperature and high wear resistance requirements, such as thermosetting plastic moulds.

3.预硬性塑料模具专用钢

3. Special steel for pre hardening plastic mould

可以直接使用已经预硬处理的模块、扁钢进行加工,避免了加工后再热处理所造成的各种缺陷，从而提高了模具的制作精度,同时缩短了制作周期。塑料模具钢的主流品种,可以划分为一般型和易切削型以及非调质型等几类。

The pre hardened modules and flat steel can be directly used for processing, avoiding various defects caused by reheat treatment after processing, thus improving the manufacturing accuracy of the mold and shortening the manufacturing cycle. The mainstream varieties of plastic die steel can be divided into general type, free cutting type and non quenched and tempered type.

此外塑料模具钢的制作成本中，加工和抛光占到了70%～80%，因此在选用模具材料时，应在保证模具使用性能要求的同时，尽可能地提高其加工工艺性能。更多相关事项就来我们网站https://www.jnqhmj.com咨询吧！

In addition, processing and polishing account for 70%~80% of the production cost of plastic mold steel. Therefore, when selecting mold materials, the processing performance should be improved as much as possible while ensuring the mold performance requirements. Come to our website for more information https://www.jnqhmj.com Consult!