C-shaped steel belongs to cold-formed thin-walled steel and is the most commonly used purlin material in steel structure factories. It is mainly arranged at the roof and wall positions, undertaking the load of roof panels and wall panels, and transmitting the load to the main frame. It can also be used for secondary beams and support components of small steel structures. It is lightweight and easy to drill, and can improve outdoor corrosion resistance when combined with galvanizing technology. It is widely used in color steel factories, warehouses, and greenhouse enclosure systems.