Structural steel pipes are hollow tubes made from steel that are primarily used in construction and infrastructure projects for supporting loads and transferring fluids or gases. These pipes are manufactured to specific dimensions and specifications to meet the requirements of various applications.

Structural steel pipes are known for their high strength-to-weight ratio, making them ideal for use in structures where strength and durability are crucial, such as bridges, buildings, and industrial facilities. They come in various shapes and sizes, including round, square, and rectangular, to accommodate different design needs.

These pipes are often fabricated from carbon steel or alloy steel, which are chosen for their mechanical properties, corrosion resistance, and weldability. They may undergo various processes such as welding, bending, and coating to enhance their performance and durability in different environments.

In construction, structural steel pipes are commonly used for applications such as:

1. Support Structures: They are used as columns, beams, and braces to support the weight of buildings, bridges, and other structures.
2. Piping Systems: They are utilized for transporting fluids or gases within buildings, industrial plants, and infrastructure projects.
3. Pile Foundations: They are driven into the ground to provide foundational support for structures such as bridges, docks, and offshore platforms.
4. Mechanical and Structural Components: They serve as components in mechanical systems, such as conveyor systems, scaffolding, and handrails.

Overall, structural steel pipes play a crucial role in modern construction and engineering projects, providing strength, durability, and versatility in a wide range of applications.