By utilizing the high hardness of tungsten carbide and improving its toughness, people use metal binders to combine tungsten carbide together, resulting in a material that far exceeds the hardness of high-speed steel. Hard alloy milling cutters have a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance, and corrosion resistance, especially their high hardness and wear resistance, which remain basically unchanged even at a temperature of 500 ℃, It still has a high hardness at 1000 ℃. The material used is hard alloy, which is widely used as tool materials, such as turning tools, milling cutters, planers, drill bits, boring cutters, etc. It is used to cut cast iron, non-ferrous metals, plastics, chemical fibers, graphite, glass, stone, and ordinary steel. It can also be used to cut difficult to machine materials such as heat-resistant steel, stainless steel, high manganese steel, and tool steel. The factors that affect the characteristics and application of hard alloy milling cutters, some of which include: (1) Challenging workpiece materials. Including materials that replace metals and difficult to machine alloy materials. Some of these materials have less than 1/4 the machinability of steel, and some materials can cost up to hundreds of dollars per pound. (2) The increasingly complex geometric shapes of workpieces. For example, thin-walled workpieces and complex shaped aviation components. (3) Large size workpieces. Especially with the increasing demand for turbines and various heavy machinery parts. The high cost per piece of these workpieces places high demands on the machining of hard alloy milling cutters. (4) The increasingly special quality and performance requirements. For example, the requirements for the fatigue strength of the surface of the processed parts. Analysis of factors determining the quality of hard alloy milling cutters: （1） Hardness and toughness Hard alloy milling cutters have unique advantages in both hardness and toughness. Tungsten carbide (WC) itself has a high hardness (exceeding that of corundum or alumina), and its hardness rarely decreases when the working temperature increases. However, it lacks sufficient toughness, which is essential for the performance of cutting tools. In order to utilize the high hardness of tungsten carbide and improve its toughness, metal binders are used to bond tungsten carbide together, allowing this material to have a hardness far exceeding that of high-speed steel while also being able to withstand the cutting forces in most cutting processes. In addition, it can withstand the cutting high temperature generated by high-speed machining. Therefore, the compatibility between the performance of hard alloy milling cutters and specific processing largely depends on the initial milling process. （2） Powder making process of hard alloy milling cutter Tungsten carbide powder is obtained by carburizing tungsten (W) powder. The characteristics of tungsten carbide powder, especially its particle size, mainly depend on the particle size of the raw tungsten powder and the temperature and time of carburization. Chemical control is also crucial, as the carbon content must remain constant (close to the theoretical ratio of 6.13% by weight). In order to control the particle size of the powder through subsequent processes, a small amount of vanadium and/or chromium can be added before carburizing treatment. The different process conditions and processing purposes of hard alloy milling cutters require the use of specific combinations of tungsten carbide particle size, carbon content, vanadium content, and chromium content. By changing these combinations, various types of tungsten carbide powder can be produced.