Channel steel is divided into ordinary channel steel and light channel steel. The specifications of hot-rolled ordinary channel steel are 5-40 #. The specifications of hot-rolled flexible channel steel supplied through agreement between the supply and demand parties are 6.5-30 #. Channel steel is mainly used in building structures, vehicle manufacturing, other industrial structures, and fixed cabinets, and is often used in conjunction with I-beams.
Channel steel is a long strip of steel with a groove shaped cross-section. Its specifications are shown in the millimeter table of waist height (h) * leg width (b) * waist thickness (d), such as 120 * 53 * 5, which represents a channel steel with a waist height of 120 millimeters, a leg width of 53 millimeters, and a waist thickness of 5 millimeters, also known as 12 # channel steel. For channel steel with the same waist height, if there are several different leg widths and waist thicknesses, a, b, and c should be added to the right of the model to distinguish them, such as 25a # 25b # 25c #, etc.
The allowable deviation of surface quality and geometric shape of channel steel is specified in the standard. The general requirement is that there should be no harmful defects on the surface, and there should be no torsion. The allowable values for the wave bending (sickle bending) of the channel steel and the values and tolerances of the relevant parameters (h, b, d, t, etc.) of the surface shape of each specification of the channel steel should be specified. The main manifestations of incorrect geometric shape of channel steel are angles, leg extensions, and leg combinations.
I-beam, also known as steel beam, is a long strip of steel with an I-shaped cross-section. I-beams are divided into three types: ordinary I-beams, light I-beams, and H-beams. I-beam is widely used in various building structures, bridges, vehicles, brackets, machinery, etc.
I-shaped steel, whether ordinary or lightweight, can only be directly used for components that are bent in the plane of their web or to form lattice load-bearing components due to the relatively high and narrow cross-sectional dimensions, resulting in a significant difference in the inertia moments of the two main axes of the section. It is not suitable to use axial compression components or components with bending perpendicular to the web plane, which limits their application range.