Steel U channel is a long steel with a grooved cross-section, belonging to carbon structural steel for construction and machinery, which is a section steel with a complex cross-section and a grooved shape. Channel steel is mainly used in building structure, curtain wall engineering, mechanical equipment and vehicle manufacturing. Channels are also often used in conjunction with I-beams. According to the theory of steel structure, the channel steel should take on stress by channel flange, that is to say, the channel steel should be standing, not lying down when using.