High-speed steel, also known as sharp steel or white steel, is a steel grade created in the United States in 1989. It boasts high hardness, high thermal resistance, and excellent wear resistance. High-speed steel is the primary material for manufacturing complex and difficult-to-grind cutting tools. When the cutting temperature exceeds 600°C, its hardness does not significantly decrease. Tools made from high-speed steel can achieve a cutting speed of over 60 meters per minute, hence the name "high-speed steel." There are various types, with W18Cr4V being a typical example. It can reach a heat treatment hardness of 63-66HRC, has a bending strength of up to 3500MPa, and is highly grindable. It is commonly used to make a variety of tools, such as drill bits, milling cutters, taps, reamers, broaches, and gear cutting tools, meeting the requirements of general engineering materials. However, it does have a slight sensitivity to decarburization.