When cold working die steel is working, due to the large deformation resistance of the processed material, the working part of the die receives a lot of pressure, bending force, impact force and conflict force. As a result, the normal scrapping reason of cold working dies is wear and tear, and premature failure due to fracture, collapse force and deformation out of tolerance.

模具钢与刃具钢相比.有许多共同点。要求模具有高的硬度和耐磨性、高的抗弯强度和满足的耐性，以保证冲压过程的顺利进行、其不同之处在于模具形状及加工艺杂乱.并且冲突面积大.磨损可能性大.所以修磨起来困难。

Cold working die steel has a lot in common with cutting tool steel. The die is required to have high hardness and wear resistance, high bending strength and satisfactory durability to ensure the smooth progress of the stamping process. The difference lies in the disordered shape and processing of the die, large conflict area and high possibility of wear, so it is difficult to grind.

因而要求具有更高的耐磨化模具作业时接受冲压力大.又由于形状杂乱易于发生应力会集，所以要求具有较高的耐性;模具尺度大、形状杂乱.所以要求较高的淬透性、较小的变形及开裂倾向性。

Therefore, it is required to have a higher wear resistance, and the die can accept large impact pressure when working. Because the shape is disordered and easy to cause stress convergence, it is required to have high resistance; the die has large scale and disordered shape, so it requires high hardenability, small deformation and cracking tendency.

总之，冷作模具钢在淬透性、耐磨性与耐性等方面的要求要较刃具钢高一些.而在红硬性方面却要求较低或基本上没要求(由于是冷态成形)，所以也相应形成了一些适于做冷作模具用的钢种.

In a word, the requirements of hardenability, wear resistance and durability of cold working die steel are higher than those of cutting tool steel, while the requirements of red hardness are lower or basically not required (due to cold forming), so some suitable steels for cold working die have been formed.