High-speed steel bar is a high-carbon tool steel containing multiple alloying elements such as tungsten, molybdenum, chromium, and vanadium. It possesses excellent red hardness, high wear resistance, and good toughness, allowing it to maintain sharpness under high-temperature cutting conditions. It is primarily used for manufacturing various high-speed cutting tools (such as drills, milling cutters, taps) as well as heavy-duty cold work dies.