C1020 is a commonly used grade of low-carbon steel. It is characterized by its relatively low carbon content, typically around 0.20%. This makes C1020 steel highly machinable and weldable.

C1020 steel offers good formability and weldability while maintaining moderate strength and excellent ductility. It is often used in various applications where low cost, easy machinability, and good mechanical properties are desired. Some common applications for C1020 steel include shafts, gears, axles, couplings, studs, bolts, and structural components.