Commonly used steel sections in steel structures include angle steel, I-beam, channel steel, H-beam, steel pipe, etc. Except for H-beam and steel pipe, which can be made by hot rolling or welding, the rest are hot-rolled steel sections.

The cross-sectional shape of the steel section is reasonable, and the material distribution is most effective when subjected to force. Since the shape of the steel section is relatively simple, there are not many types and sizes, it is easy to roll and convenient for structural members to connect with each other. Steel section is the main steel used in steel structure. As shown in the figure. The specifications and cross-sectional details of the steel section can be found in "Hot-rolled Steel Sections" (GB/T 706-2016).