AISI 1045 is a medium carbon steel known for its good balance of strength, toughness, and wear resistance. It contains approximately 0.45% carbon, which enhances its hardness and strength compared to lower carbon steels. This makes it suitable for various applications, including shafts, gears, and axles. The steel can be heat-treated to improve its mechanical properties further, making it versatile for different industrial uses. AISI 1045 is often used in the manufacturing of machinery and automotive components, where durability and performance are essential. Its weldability and machinability also contribute to its popularity in engineering applications.