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Properties And Classification Of Hot Work Die Steel
Nov 07, 2017

Properties and Classification of Hot Work Die Steel


Hot work die steel types and their sub-law are different. There are four commonly used classification methods: The first classification method is based on the use of the molds to create the classification, hot work die steel can be divided into forging die steel, hot forging die steel, hot extrusion die steel, hot punch Cutting die steel and precision forging die steel and die-casting die steel; the second classification method is based on its performance-specific performance classification, hot work die steel can be divided into high toughness hot work die steel, hot and hot die steel, High wear-resistant hot-work die steel and special high-strength hot for die steel; the third classification is based on the main elements of its composition to classify, hot die steel can be divided into chromium-based hot work die steel, tungsten hot work Die steel and molybdenum hot work die steel; the fourth classification is based on the amount of alloy elements contained (mass fraction) how much to classify the hot work die steel containing the total amount of alloying elements (mass fraction) much Can be divided into low alloy hot work die steel, alloy hot work die steel, high alloy hot work die steel.


Hot die is divided into several major types of forging, die forging, extrusion and die-casting, including hot forging die, die forging press, stamping die, hot extrusion die and metal die-casting mold. Hot deformation mold in addition to work under enormous mechanical stress, but also to withstand the repeated use of heat and cooling, causing a great thermal stress. In addition to high-temperature die steel should have high hardness, strength, red hardness, wear resistance and toughness, but also should have good high temperature strength, thermal fatigue stability, thermal conductivity and corrosion resistance, in addition also requires a higher Hardenability, to ensure that the entire cross-section with a consistent mechanical properties. For die-cast steels, there should also be no surface cracking, repeated heating and cooling, and the ability to withstand the impact and erosion of liquid metal flow. This type of steel is generally carbon steel, carbon mass fraction of 0.30% ~ 0.60%, belonging to hypoeutectoid steel, but also part of the steel due to join more of the alloying elements (such as tungsten, molybdenum, vanadium, etc.) and become eutectoid or Metallurgical steel. Commonly used steel chromium-manganese steel, chrome-nickel steel, chromium tungsten steel.


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