Angle steel,commonly known as angle iron ,is a carbon structural steel used in construction. It is a long strip of steel with two sides perpendicular to each other. It is a  profile steel with  simple section . Angle steel is divided into equal  Angle steel and unequal  Angle steel. The raw billet for the production of  steel angles is low carbon square billet, and the finished  Angle steel is devided into hot rolled, normalized or hot rolled state.  Angle steel can  make up  different stress components according to the different needs of the structure, as the connection between components. Widely used in a variety of building structures and engineering structures, such as beams, Bridges, transmission towers, lifting and transportation machinery, ships, industrial furnaces, reaction towers, container racks and warehouses.