Carbon steel square pipe is a square section of steel pipe, mainly composed of carbon, manganese, silicon, phosphorus, sulfur and other elements. Carbon steel square pipe has good plasticity and mechanical properties, while having high strength and compressive properties, so it is widely used in many fields, including building structures, machinery manufacturing, highway facilities, bridge pipelines and so on. In the field of construction, carbon steel square pipes are often used to construct and strengthen the structure of buildings, such as building frames, support columns, stair railings, railings, etc., to improve the safety and stability of buildings. In the field of mechanical manufacturing, carbon steel square pipes can be used to manufacture various mechanical equipment and parts, such as conveying equipment, transmission shafts, cooling pipes, mechanical structures, etc.