Tungsten, chemical element symbol W, is a rare and important metallic element. Tungsten is widely used in the manufacture of high-speed cutting alloy steel, superhard molds and lamp filaments. Its carbides have high wear resistance and refractory properties, and are often used in cemented carbide, such as cutting tools, mining tools and wire drawing dies. In addition, tungsten is also used in the electronics and power industry, such as tungsten wire in light bulbs and electronic oscillating tubes. Tungsten alloy is widely used in aerospace, aviation, military and other fields because of its high strength, high specific gravity and good comprehensive mechanical properties.