Mild steel square tubes are commonly used as structural components in various applications due to their strength, durability, and versatility. They are used in construction, engineering, and fabrication projects where a strong and rigid framework is required. Some of the common structural applications of mild steel square tubes include:

1. Building and Construction: Mild steel square tubes are widely used in building and construction projects for various applications, such as columns, beams, trusses, and braces. They provide structural support and stability to buildings and other structures.
2. Steel Framing Systems: Mild steel square tubes are commonly used in steel framing systems for commercial and industrial buildings. They are used as primary load-bearing members in steel frame structures, providing strength and stability to the overall framework.
3. Industrial Equipment: Mild steel square tubes are used in the fabrication of industrial equipment, such as conveyor systems, material handling equipment, and machinery frames. They provide structural support and rigidity to withstand heavy loads and harsh operating conditions.
4. Automotive and Transportation: Mild steel square tubes are used in the fabrication of vehicle frames, chassis, and other structural components in the automotive and transportation industry. They provide strength, durability, and stability to the vehicle structure.
5. Furniture and Racking Systems: Mild steel square tubes are used in the manufacturing of furniture, racking systems, and shelving units. They provide structural support and stability to furniture frames and storage systems.
6. Agricultural Equipment: Mild steel square tubes are used in the fabrication of agricultural equipment, such as grain bins, livestock pens, and fencing. They provide structural integrity and durability to withstand outdoor and agricultural environments.

It’s important to ensure that the mild steel square tubes used in structural applications are sourced from reputable suppliers and meet relevant industry standards for quality and strength. Proper engineering and design considerations should also be taken into account to ensure the safe and efficient use of mild steel square tubes in structural applications.