开模具如何选定合适的模具钢呢?其实选模具钢主要的影响因素是产量，客户期望，。低模具，很多采用45#钢调质使用。所以，低端模具基本上就忽略了其它的因素。排除低端模具外，按正常的思路，从模具的角度来说，模具钢的选用应考虑塑料是否具有腐蚀性，产品是否有镜面抛光，蚀纹要求，模具零件的磨损性能等。在这基础之上，再考虑模具量产等级。

How to select the appropriate die steel for die opening? In fact, the main factors affecting the selection of die steel are output, customer expectations and price. Low price moulds, many of which are made of 45\\. Therefore, the low-end mold basically ignores other factors. Excluding low-end molds, according to the normal idea, from the perspective of molds, the selection of mold steel should consider whether the plastic is corrosive, whether the product has mirror polishing, etching requirements, and the wear performance of mold parts. On this basis, consider the mold mass production grade.

此外高碳模具钢强度大，硬度大，用于切削刀具，工具钢。低碳模具钢：拉伸时的应力-应变曲线主要分四个阶段：弹性阶段、屈服阶段、强化阶段、局部变形阶段，在局部变形阶段有明显的屈服和颈缩现象。开始时为弹性阶段，完全遵守胡克定律沿直线上升，比例极限以后变形加快，但无明显屈服阶段。低碳模具钢塑性强，硬度高，抗拉强度好，多用于结构承载上。

In addition, high carbon die steel has high strength and hardness. It is used for cutting tools and tool steel. Low carbon die steel: the stress-strain curve during stretching is mainly divided into four stages: elastic stage, yield stage, strengthening stage and local deformation stage. There are obvious yield and necking phenomena in the local deformation stage. At the beginning, it is the elastic stage, which fully obeys Hooke's law and rises along a straight line. After the proportional limit, the deformation accelerates, but there is no obvious yield stage. Low carbon die steel has strong plasticity, high hardness and good tensile strength. It is mostly used for structural bearing.

开始报模具时，很多客户是指定模具钢，除特别不合理之外，一般都是顺应客户的意愿。若客户没指定，则应先跟客户沟通，确定好使用模具钢之后，再报模具。而这里，就需要对模具钢做个基本的判断，大致总结归纳如下：

At the beginning of quoting mold prices, many customers specify mold steel. Except for being unreasonable, they generally comply with the wishes of customers. If the customer does not specify, it should first communicate with the customer to determine the use of die steel, and then quote the die price. Here, we need to make a basic judgment on the die steel, which is roughly summarized as follows:

低端低价模，用45#模具钢或P20模具钢。

Low end low-cost die, 45\\p20 die steel or die steel.

高价模，高镜面要求用S136模具钢，腐蚀性强用1.2316模具钢

S136 die steel is required for high price die and high mirror surface, and 1.2316 die steel is required for strong corrosion

没腐蚀性用NAK80模具钢或718H模具钢

Non corrosive NAK80 die steel or 718H die steel

硬模多用8407模具钢，H13模具钢，1.2344模具钢。

8407 die steel, H13 die steel and 1.2344 die steel are commonly used for hard molds.

质量和精度要求高的，选用耐磨性和硬度好的模具钢。

Die steel with good wear resistance and hardness shall be selected for those with high quality and precision requirements.

还有很多人按模具产量来分，其实按山东模具钢小编个人想法的话，就会认为，除了试验模，低端低量产模之外(一般指30万次以内的模具)，产量因素不应太大，真正高品质的产品，模具生产了50万次跟没生产时，产品的品质上肯定有差别。只是能否接受的问题。而这个段位的模具，用料基本都上了一定的等级。到达这一级别后，料与产量之比，不会太大。

There are also many people who divide according to the mold output. In fact, according to the personal idea of Shandong mold steel Xiaobian, they will think that in addition to the test mold and low-end mass production mold (generally refers to the mold with less than 300000 times), the output factor should not be too large. For truly high-quality products, when the mold has been produced for 500000 times, there must be a difference in product quality. It's just a question of acceptability. The materials used for the moulds of this segment have basically reached a certain level. After reaching this level, the ratio of material to output will not be too large.

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