Channel steel is a long stripe of steel with a fluted section, construction and mechanical use of carbon structural steel, and 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., It 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.