The angle steel can be composed of various stress-bearing components according to the different needs of the structure, and can also be used as a connection between the components. Widely used in various building structures and engineering structures, such as beams, bridges, transmission towers, lifting and transportation machinery, ships, industrial furnaces, reaction towers, container racks, cable trench supports, power piping, busbar support installation, and warehouses Shelves etc. Angle steel is a carbon structural steel for construction, which is a section steel with a simple section, mainly used for metal components and the frame of a workshop. In use, it is required to have good weldability, plastic deformation performance and certain mechanical strength. The raw material billet for producing angle steel is low carbon square billet, and the finished angle steel is delivered in hot-rolled, normalized or hot-rolled state.