Die steel can be roughly divided into three categories: cold-rolled die steel, hot-rolled die steel and plastic die steel, used in forging, stamping, cutting, die-casting and so on. Due to the different uses of various molds and the complex working conditions, the steel used for molds should have high hardness, strength, wear resistance, sufficient toughness, and high hardenability and quenching, depending on the working conditions of the molds it is manufacturing. Hardness and other process properties. Because of these different uses and the complex working conditions, the performance requirements for the steel used in the molds are also different.
Cold-rolling dies include cold dies, wire drawing dies, drawing dies, embossing dies, rifling dies, rolling dies, cold dies and cold dies. Cold working die steel, according to its working conditions, should have high hardness, strength, wear resistance, sufficient toughness, and high hardenability, hardenability and other process properties. The alloy tool steel used for this type of application is generally a high-carbon alloy steel with a carbon mass fraction of more than 0.80%. Chromium is an important alloying element of such steels and its mass fraction is usually not more than 5%.
Hot-rolling dies are divided into hammer forging, die forging, extruding and die-casting several main types, including hot forging dies, press dies, press dies, hot extruding dies and metal die casting dies. In addition to the enormous mechanical stress, the hot-deformed die also has to withstand repeated heating and cooling, which causes great thermal stress.