classification Channel steel is divided into ordinary channel steel and light channel steel. The specification of hot rolled ordinary channel steel is 5-40#. The specification of hot-rolled flexible channel steel supplied through agreement between the supplier and the buyer is 6.5-30#. Channel steel is mainly used in building structure, vehicle manufacturing, other industrial structures and fixed panels and cabinets. Channel steel is often used together with I-beam. Channel steel can be divided into four types according to shape: cold-formed equal edge channel steel, cold-formed unequal edge channel steel, cold-formed inner crimping channel steel and cold-formed outer crimping channel steel. According to the theory of steel structure, it should be the force on the wing plate of channel steel, that is to say, the channel steel should stand rather than lie down.