There are many classification methods for hot work die steel, which can be classified according to the content of alloy elements and the properties after heat treatment, and can be classified according to the purpose or by alloying elements.

(1) According to the use, it can be divided into steel for hot forging die, steel for hot extrusion die, steel for die-casting die, and steel for hot stamping die.

(2) According to heat resistance, it can be divided into low heat resistant steel (350 ~ 370 ° C), medium heat resistant steel (550 ~ 600 ° C), high heat resistant steel.

(3) According to the unique performance, it is divided into high toughness hot work die steel, high heat and hot work die steel, and high wear resistant hot work die steel.

(4) According to the classification of alloy elements, it can be divided into low alloy hot work die steel (tungsten, chromium and molybdenum), medium alloy hot work die steel and high alloy hot work die.

(Tungsten-molybdenum-based and chrome-molybdenum-based); or divided into tungsten-based hot die steel, chromium-based hot die steel, and chromium-tungsten-molybdenum hot die steel. High chromium-tungsten high alloy hot work die steel

The strength and thermal stability are inferior to those of tungsten and molybdenum, while the thermal fatigue resistance and toughness are higher than that of tungsten and molybdenum.