冷作模具钢是指使金属在冷态下变形或成形所使用的模具钢，常用的专用冷作模具钢是Crl2型钢，其含碳量为1.45%～2.30%，含铬量为11%～13%。下面来讲讲冷作模具钢具备四大使用性能！

Cold working die steel refers to the die steel used to deform or shape metal in cold state. The common special cold working die steel is Crl2 steel, with carbon content of 1.45%~2.30% and chromium content of 11%~13%. Now let's talk about the four major performance of cold working die steel!

1)较高的耐磨性

1) High wear resistance

冷作模具在工作时，表面与坯料之间产生许多次摩擦，模具在这种情况下须仍能保持较低的表面粗糙度值和较高的尺寸精度，以防止早期失效。

When the cold working die is working, there are many times of friction between the surface and the blank. In this case, the die must still be able to maintain a lower surface roughness value and a higher dimensional accuracy to prevent early failure.

由于模具材料的硬度和组织是影响模具耐磨性能的重要因素，因此为了提高冷作模具的抗磨性能，通常要求模具硬度高于加工件硬度30%～50%，材料的组织为回火马氏体或下贝氏体，其上分布均匀、细小的颗粒状碳化物。要达到此目的，钢中的碳的质量分数一般都在0.60%以上。

Since the hardness and structure of the die material are important factors affecting the wear resistance of the die, in order to improve the wear resistance of the cold working die, it is generally required that the hardness of the die is 30%~50% higher than the hardness of the workpiece, and the structure of the material is tempered martensite or lower bainite, with uniform and fine granular carbide distributed above it. To achieve this goal, the mass fraction of carbon in steel is generally above 0.60%.

2)较高的强度和韧性

2) High strength and toughness

模具的强度是指模具零件在工作过程中抵抗变形和断裂的能力。强度指标是冷作模具设计和材料选择的重要依据，主要包括拉伸屈服点、压缩屈服点等。屈服点是衡量模具零件塑性变形抗力的指标，也是常用的强度指标。为了获得高的强度，在模具制造过程中，要模具材料的韧性，要根据模具工作条件来决定，对于强烈冲击载荷的模具，如冷作模具的凸模、冷镦模具等，因受冲击载荷较大，需要高的韧性。对于一般工作条件下的冷作模具，通常受到的是小能量多次冲击载荷的作用，模具的失效形式是疲劳断裂，因此模具不必具有过高的冲击韧度值。

The strength of the die refers to the ability of the die parts to resist deformation and fracture during the working process. Strength index is an important basis for cold working die design and material selection, mainly including tensile yield point, compression yield point, etc. The yield point is an index to measure the resistance to plastic deformation of mold parts, and is also a commonly used strength index. In order to obtain high strength, the toughness of the die material in the die manufacturing process should be determined according to the working conditions of the die. For the die with strong impact load, such as the punch of cold working die, cold heading die, etc., due to the large impact load, high toughness is required. For cold working dies under general working conditions, they are usually subjected to small energy repeated impact loads. The failure form of dies is fatigue fracture, so the dies need not have high impact toughness values.

3)较强的抗咬合性

3) Strong anti occlusion

咬合抗力实际就是对发生“冷焊”的抵抗能力。通常在干摩擦条件下，把被试验模具钢试样，与具有咬合倾向的材料（如奥氏体钢），进行恒速对偶摩擦运动，以一定速度逐渐增大载荷，此时转矩也相应增大。当载荷加大到某一临界值时，转矩突然急剧增大，这意味着发生咬合，这一载荷称为“咬合临界载荷”。临界载荷越高，标志着咬合抗力越强。

The bite resistance is actually the resistance to cold welding. Generally, under the dry friction condition, the tested die steel sample and the materials with occluding tendency (such as austenitic steel) are subjected to the constant speed dual friction movement, and the load is gradually increased at a certain speed, at this time, the torque is also correspondingly increased. When the load is increased to a certain critical value, the torque suddenly increases sharply, which means that occlusion occurs. This load is called "critical occlusion load". The higher the critical load is, the stronger the occlusion resistance is.

4)受热软化能力

4) Heat softening capacity

受热软化能力反映了冷作模具钢在承载时温升对硬度、变形抗力及耐磨性的影响。表征冷作模具钢受热软化抗力的指标主要有软化温度（℃）和二次硬化硬度（HRC）。

The heat softening ability reflects the influence of temperature rise on hardness, deformation resistance and wear resistance of cold work die steel under load. The softening temperature (℃) and secondary hardening hardness (HRC) are the main indicators to characterize the softening resistance of cold work die steel.

此外要注意在生产加工等作模具钢的时候，还一定要根据其具体的要求，保证设备加工之后，能够顺利使用。如需了解更多关于模具钢知识可以来我们网站https://www.jnqhmj.com进行咨询！

In addition, it should be noted that when making die steel for production and processing, it must also be based on its specific requirements to ensure that the equipment can be used smoothly after processing. For more information about die steel, please visit our website https://www.jnqhmj.com Consult!