Steel structure refers to the structural form which can bear and transfer load by connecting steel plate and hot-rolled, cold-formed or welded profiles through connectors.Steel structure system has the comprehensive advantages of light weight, factory manufacturing, fast installation, short construction period, good seismic performance, fast investment recovery, and less environmental pollution. Compared with reinforced concrete structure, it has the unique advantages of “high, large and light” development. In the global scope, especially in developed countries and regions, steel structure has been integrated in the field of construction engineering.It is widely used.

Steel structure industry is usually divided into five sub categories: light steel structure, high-rise steel structure, residential steel structure, spatial steel structure and bridge steel structure. 

characteristic

　　1. the self weight of steel structure is light;

　　2.The reliability of steel structure is high;

　　3.The steel has good vibration (shock) resistance and impact resistance;

　　4.The industrialization degree of steel structure manufacturing is high;

　　5.Make sealing structure;

　　7. steel structure is easy to corrode;

　　8. poor fire resistance of steel structure.

Grades and properties of commonly used steel structures

　　1. carbon structural steel: Q195, Q215, Q235, q255, Q275, etc;

　　2, low alloy high-strength steel structure;

　　3. high quality carbon structural steel and alloy structural steel;

　　4. special purpose steel.