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Composition Characteristics and Classification of Hot Work Die Steel


Many products are now made without molds. A mold is a tool for making a shaped article, and the processing of the article is realized by changing the physical form of the material. Different molds consist of different parts.


Hot work die steel is a die used for heat deformation when metal is made. The hot work die bears a lot of impact force when working and its operating conditions are very harsh. Therefore, the hot work die has good wear resistance, high temperature resistance, and good toughness. Next, I will introduce the composition characteristics and classification of hot work molds.


1. Composition characteristics of hot work die steel


(1) Carbon content


Generally, it is medium carbon and the mass fraction of carbon is 0.3% to 0.6%. It is necessary to ensure that the material has high strength and hardness, high hardenability, and good plasticity and toughness.


(2) Alloying elements


The added alloying elements include Cr, Mn, Si, Ni, W, Mo, V, and other alloying elements. Among them, the role of Cr, Mn, Si, and Ni alloying elements is to strengthen the ferrite and improve the hardenability.


W and Mo alloying elements are to prevent temper brittleness. Cr, W, and Si alloying elements can increase the phase transition temperature, so that the mold will not undergo phase transition during the alternate heating and cooling process, but a large volume change will occur, thereby improving its ability to resist thermal fatigue. In addition, W, Mo, V, etc. are precipitated in the form of carbides during tempering to produce secondary hardening, so that the hot work die steel still maintains a relatively high hardness at higher temperatures. This is one of the important conditions for the normal operation of hot work die steel. Cr and Si can improve the oxidation resistance of steel.


2. Classification of the hot work die steel


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


(2) According to the heat resistance, it can be divided into low heat-resistant steel, medium heat-resistant steel, and high heat-resistant steel.


(3) According to its unique properties, it is divided into high toughness hot work die steel, high heat and strength hot work die steel, and high wear-resistant hot work die steel.


(4) According to the classification of alloying elements, it can be divided into low alloy hot work die steel, medium alloy hot work die steel, and high alloy hot work die steel. Or it can be divided into tungsten series hot work die steel, chromium series hot work die steel, and chromium tungsten hot work die steel Molybdenum-based hot die steel. The high-temperature strength and thermal stability of chromium-tungsten series high-alloy hot work die steel are not as good as those of the tungsten-molybdenum series, while the thermal fatigue resistance and toughness are higher than those of tungsten-molybdenum series.


The above is about the composition characteristics and classification of hot work molds. The working conditions of hot work molds are very harsh, so they have very good heat resistance. If you want to know more about this product, you can pay more attention to us.


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