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Process performance of die steel
Jul 19, 2017

In the mold production cost, material cost usually accounts for 10%~20%, and mechanical processing, heat treatment, assembly and management costs accounted for more than 80%, so the process performance of the die material is one of the main factors affecting the mold production cost and manufacturing difficulty.


- hot workability, refers to thermoplastic, processing temperature range, etc.;

Hot work die steel

Hot work die steel

- cold working performance, refers to cutting, grinding, polishing, cold drawing and other processing properties.

Cold working die steels are mostly eutectoid steels and bainitic steels, and the hot and cold working properties are not very good. Therefore, it is necessary to strictly control the technological parameters of hot working and cold working to avoid defects and waste products. On the other hand, by improving the purity of steel, reducing the content of harmful impurities, improving the microstructure of steel, to improve the hot processing and cold processing performance of steel, thereby reducing the production cost of the die.

To improve the performance of cold working die steel, since the beginning of 1930s, on S, Pb, adding graphite Ca and Te cutting elements or resulting in die steel die steel to carbon element in the development of a variety of free cutting steel, to further improve the cutting performance and grinding performance, reduce abrasive tool consumption and low cost.

Hardenability and hardenability

Hardenability depends mainly on the chemical composition of the steel and the original microstructure before hardening. The hardenability is mainly determined by the carbon content in the steel. For most cold work die steels, hardenability is often one of the major considerations. For hot work die steel and plastic die steel, the general mold size is larger, especially the manufacture of large mold, its hardenability is more important. In addition, the complex shape is easy to produce all kinds of mold heat treatment deformation, in order to reduce the quenching deformation of quenching medium, often as far as possible the use of cooling ability, such as air cooling, oil cooling or cooling bath, in order to get the required hardness and depth of hardened layer, requires the use of high hardenability die steel.

Quenching temperature and deformation of heat treatment

In order to facilitate production requirements of die steel after quenching temperature range as far as possible to relax some, especially when the mold by flame heating partial quenching, because it is difficult to accurately measure and control temperature, requires a wide range of quenching temperature of die steel.

Die during the heat treatment, especially in the quenching process, to produce the volume change, shape warping, distortion and so on, in order to ensure the quality of the mould and heat treatment requirements of die steel with small deformation, especially for precision mould with complicated shape, it is difficult to repair after quenching, heat treatment for deformation of the more demanding. It should be the choice of micro deformation of die steel.

Oxidation and decarburization sensitivity

During the heating process, if the oxidation and decarburization occur, the hardness, wear resistance, service performance and service life of the mold will be reduced. Therefore, the oxidation and decarburization sensitivity of the die steel will be better. Because of the high sensitivity of oxidation and decarburization, special heat treatment, such as vacuum heat treatment, controllable atmosphere heat treatment and salt bath heat treatment, should be adopted for die steels with high molybdenum content.

Hubei Kaixin Supply Chain Management Co., Ltd.

TEL +8618272169977 ; 0714-6510168



AddNo.37 Huahu Ave Huahu Street.Huangshi City Hubei