Channel steel is a long steel strip with a grooved cross section. Its specifications are expressed in millimeters of waist height (h)*leg width (b)*waist thickness (d), such as 120*53*5, which means a channel steel with a waist height of 120 mm, a leg width of 53 mm, and a waist thickness of 5 mm, or 12# channel steel. Channel steels with the same waist height, if there are several different leg widths and waist thicknesses, also need to add a b c to the right of the model to distinguish them, such as 25a# 25b# 25c#, etc.

Channel steel is divided into ordinary channel steel and light channel steel. Channel steel is mainly used in building structures, vehicle manufacturing and other industrial structures. Channel steel is also often used in conjunction with I-beams.

Channel steel can be divided into 4 types according to shape: cold-formed equilateral channel steel, cold-formed unequal-sided channel steel, cold-formed inner-curled channel steel, cold-formed outer-curled channel steel.