Channel steel is a long stripe of steel with a fluted  section , construction and mechanical use of carbon structural steel, is a profile steel with  complex section , its section shape is groove shape. Channel steel is mainly used in building structure, curtain wall engineering, mechanical equipment and vehicle manufacturing., Channel steel is often used together with I steel.
Channel steel is divided into ordinary u-steel and light Channel steel. The specification of hot rolled ordinary Channel steel is 5-40#. The specification of hot rolled flexible Channel steel is 6.5-30# after  agreement between the purchaser and the supplier.

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.