There are many types of die steel, hot work die steel is currently used in many aspects, so what is hot work die steel, and what are the advantages of hot work die steel? For these two problems, you can understand in detail with Shandong hot working die steel.

热作模具钢是指适宜于制作对金属进行热变形加工的模具用的合金工具钢，如锻模、热挤压模、压铸模、热镦模等。由于热作模具长时间处于高温高压条件下工作，因此，要求模具材料具有高的强度、硬度及热稳定性，特别是应有高热强性、热疲劳性、韧性和耐磨性。

Hot working die steel refers to the alloy tool steel suitable for hot deformation of metal, such as forging die, hot extrusion die, die casting die, hot upsetting die, etc. Because the hot working die works under high temperature and high pressure for a long time, the die material is required to have high strength, hardness and thermal stability, especially high thermal strength, thermal fatigue, toughness and wear resistance.

热作模具在工作时承受着很大的冲击力，模腔和高温金属接触，反复地加热和冷却，其使用条件极其恶劣。为了满足热作模具的使用要求，热作模具钢应具备下列基本特性：

The hot working die bears a great impact force when it works. The die cavity contacts with high temperature metal and is heated and cooled repeatedly, so its service condition is extremely bad. In order to meet the requirements of hot working die, hot working die steel should have the following basic characteristics:

(1)较高的高温强度和良好的韧性。热作模具，尤其是热锻模，工作时承受很大的冲击力，而且冲击频率很高，如果模具没有高的强度和良好的韧性，就容易开裂。

(1) High temperature strength and good toughness. Hot working dies, especially hot forging dies, bear a lot of impact force when working, and the impact frequency is very high. If the die does not have high strength and good toughness, it is easy to crack.

(2)良好的耐磨性能，由于热作模具丁作时除受到毛坯变形时产生摩擦磨损之外，还受到高温氧化腐蚀和氧化铁屑的研磨，所以需要热作模具钢有较高的硬度和抗黏附性。

(2) Good wear resistance, because the hot work die is not only subject to friction and wear when the blank is deformed, but also subject to high temperature oxidation corrosion and grinding of iron oxide chips, so the hot work die steel needs to have high hardness and anti adhesion.

(3)高的热稳定性。热稳定性是指钢材在高温下可长时间保持其常温力学性能的能力。热作模具工作时，接触的是炽热的金属，甚是液态金属，所以模具表面温度很高，一般为400～700℃。这就要求热作模具钢在高温下不发生热化，具有高的热稳定性，否则模具就会发生塑性变形，造成堆塌而失效。

(3) High thermal stability. Thermal stability refers to the ability of steel to maintain its mechanical properties at room temperature for a long time at high temperature. When the hot working die works, the contact is hot metal, even liquid metal, so the surface temperature of the die is very high, generally 400 ~ 700 ℃. This requires that the hot work die steel does not heat at high temperature and has high thermal stability, otherwise the die will have plastic deformation, resulting in collapse and failure.

(4)优良的耐热疲劳性，热作模具的工作特点是反复受热受冷，模具一时受热膨胀，一时又冷却收缩，形成很大的热应力，而且这种热应力是方向相反，交替产生的。在反复热应力作用下，模具表面会形成网状裂纹(龟裂)，这种现象称为热疲劳，模具因热疲劳而过早地断裂，是热作模具失效的主要原因之一。所以热作模具钢必须要有良好的热疲劳性。

(4) Excellent heat resistance and fatigue. The working characteristic of hot working die is that it is repeatedly heated and cooled. The die expands when heated and shrinks when cooled, forming great thermal stress. Moreover, this kind of thermal stress is produced alternately in the opposite direction. Under the action of repeated thermal stress, network cracks (cracks) will form on the surface of the die, which is called thermal fatigue. The premature fracture of the die due to thermal fatigue is one of the main reasons for the failure of the hot working die. So hot work die steel must have good thermal fatigue.

热作模具钢需要在高温高压条件下工作，所以对其性能要求还是非常高的。上面介绍的这七个方面的特点，是其独有的优势，和很多其他的模具钢相比，更胜一筹，可以在高温高压的环境下长时间使用.

Hot working die steel needs to work under high temperature and high pressure, so its performance requirements are very high. Compared with many other die steels, it can be used for a long time under high temperature and high pressure