When the cold work die steel is in operation, the working part of the mold is subjected to great pressure, bending force, impact force and friction force due to the large deformation resistance of the material to be processed. Therefore, the reason for the normal scrapping of cold-working dies is generally wear. There are also premature failures due to breakage, collapse and deformation.

Cold work die steel has much in common with cutting steel. The mold is required to have high hardness and wear resistance, high bending strength and sufficient toughness to ensure the smooth progress of the stamping process. The difference lies in the complexity of the mold shape and the addition of I. The friction area is large. The possibility of wear Big. So it is difficult to fix it. Therefore, it is required to have a higher wear-resistant mold to withstand a large punching force when working, and a stress concentration due to a complicated shape, so that a high toughness is required; a large mold size and a complicated shape require high hardenability, Less deformation and tendency to crack. In short, the cold work die steel has higher requirements on hardenability, wear resistance and toughness than the blade steel. However, the red hardness is required to be lower or basically not required (because it is cold formed), so Correspondingly, some steel types suitable for cold working molds have been formed, for example, steels for high wear resistance, micro-deformation cold work molds, and steels for high toughness cold work molds have been developed. The following is a further description in conjunction with the selection of steel grades.

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