Steel pipes have long been used in construction, especially in marine engineering and bridge engineering. Compared with section steel, they have the following characteristics: First, the section of steel pipes (square, rectangular) has the characteristics of smooth surface, no dead angle and small external surface area, so It is not only conducive to saving anti-corrosion and fire-resistant coatings, but also easy to remove dust; secondly, the steel pipe is used in a fluid (wind, water flow) environment, and its resistance is smaller; finally, the hollow structure of the steel pipe can be filled with concrete to improve the structural strength, or transport fluid, To make up for the characteristics of low fire resistance.

Steel structure building is mainly refers to the main bearing component is composed of steel, including the steel columns, steel beam, steel structure, and together with roofs, walls, and floors constitute buildings. Each component using welds, bolts or rivets to connect.Generally, the steel structure shall be derusted, galvanized or coated, and shall be maintained regularly.Therefore, steel structure buildings have the following characteristics:1. Greatly save construction time. The construction is not affected by seasons.2. Increase the use area of buildings and reduce construction waste and environmental pollution.3. Building materials can be reused to drive the development of other new building materials industries.4. It has good seismic performance, convenient transformation, flexibility, high strength, light weight, high safety, rich components and low cost.