Essential points on the technical performance of mould steel

Update:18-02-2020
Summary:

The use of mould steel is very wide, so the working con […]

The use of mould steel is very wide, so the working conditions of mould steel must meet the height, strength, wear resistance, and sufficient toughness, as well as high hardenability, hardenability and other process properties. We need to know four important points about the performance of the mould.

1.Processability

Refers to forging, rolling hot workability, and cold workability in the form of cutting and grinding.They are related to the chemical composition of sodium, metallurgical quality, microstructure, and sulfur and phosphorus content. Most of the mould steel contains a variety of alloy elements. In addition, steels with higher contents, especially high-carbon and high-alloy steels, must strictly control the heating system and cooling method during hot working. To avoid or reduce the waste of hot working, and improve the structure state before cold working, In order to reduce the tool wear during cold working and improve the surface quality of the mould.

2. Heat treatment deformation and quenching temperature.

The finished mould requires the size and shape of the mould to be more stable during the final heat treatment. Therefore, the degree of deformation of the mould during the heat treatment is very strict, and the quenching temperature range is wide enough to reduce the occurrence of Overheating.

3. Hardenability and hardenability

Hardenability is mainly related to the chemical composition of the steel, especially the carbon content. Hardenability depends on the chemical composition of the steel. It is also related to the original structure of the steel before quenching. The requirements for these two properties of mould steel are different according to the conditions of use of different moulds. For example, for steels for die-cutting and drawing dies that require high hardness on the surface, the hardenability is relatively heavy and easy, and for hot hammer forging die steels that require uniform and consistent properties across the entire section, hardenability is even more important.

4.Decarbonization sensitivity

Decarburization of the mould surface will reduce the mechanical properties of the mould surface layer, so the lower the decarburization sensitivity of the mould steel, the better. However, under the same heating conditions, the decarburization sensitivity of steel depends on the chemical composition of the steel, especially the amount of carbon.

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