S45C is a medium carbon steel commonly used in mechanical engineering and manufacturing. It has a carbon content of approximately 0.45%, which provides a good balance of strength and ductility. This steel is often used for making components like shafts, gears, and bolts due to its excellent machinability and ability to be heat treated for enhanced hardness. The properties of S45C make it suitable for various applications, including automotive and industrial machinery. It can be easily welded and formed, making it a versatile choice for engineers. Additionally, it is often compared to other steels like S35C and S50C for specific applications based on their carbon content and mechanical properties.