High speed steel (HSS) is a tool steel with high hardness, high wear resistance and high heat resistance, also known as high speed tool steel or front steel, commonly known as white steel. High-speed steel has good process performance, good strength and toughness, so it is mainly used to manufacture complex thin-edged and impact-resistant metal cutting tools. It can also manufacture high-temperature bearings and cold extrusion molds. In addition to the high-speed steel produced by the smelting method, powder metallurgy high-speed steel appeared after the 1960s. Its advantage is to avoid the reduction of mechanical properties and heat treatment deformation caused by carbide segregation caused by the smelting method.