What is channel steel, how to classify channel steel

What is channel steel, how to classify channel steel

Channel steel is a long strip of steel with a groove-shaped cross-section. It is a carbon structural steel for construction and machinery. It is a section steel with a complex cross-section. Channel steel is mainly used in building structure, curtain wall engineering, mechanical equipment and vehicle manufacturing.

In use, it is required to have good welding, riveting performance and comprehensive mechanical properties. The raw material billets for producing channel steel are carbon-structured steel or low-alloy steel billets with a carbon content not exceeding 0.25%. The finished channel steel is delivered in hot-formed, normalized or hot-rolled state. Its specifications are expressed in millimeters of waist height (h) * leg width (b) * waist thickness (d), such as 100*48*5.3, ​​which means that the waist height is 100 mm, the leg width is 48 mm, and the waist thickness is 5.3 mm. Steel, or 10# channel steel. For channels with the same waist height, if there are several different leg widths and waist thicknesses, a b c should be added to the right side of the model to distinguish them, such as 25#a 25#b 25#c, etc.

Channel steel 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 by agreement between the supplier and the buyer is 6.5-30#. Channel steel is mainly used in building structures, vehicle manufacturing, other industrial structures and fixed cabinets, etc. Channel steel is often used in conjunction with I-beam steel.

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, and cold-formed outer-curved channel steel.
According to the theory of steel structure, the channel steel wing plate should be stressed, that is to say, the channel steel should be standing, not lying down.

Channel steel specification setting:
The specifications of channel steel are mainly expressed by dimensions such as height (h), leg width (b), waist thickness (d), etc. The specifications of domestic channel steel are from 5-40, that is, the corresponding height is 5-40cm.

At the same height, light channel steel has narrower legs, thinner waist and lighter weight than ordinary channel steel. No. 18-40 is a large channel, and No. 5-16 is a medium channel. Imported channel steel indicates the actual size and relevant standards. The import and export order of channel steel is generally based on the specifications required in use after determining the corresponding carbon steel (or low alloy steel) steel grade. Apart from the specification number, there is no specific composition and performance series for channel steel.

The delivery length of channel steel is divided into fixed length and double length, and the tolerance value is specified in the corresponding standard. The length selection range of domestic channel steel is divided into three types: 5-12m, 5-19m and 6-19m according to different specifications. The length selection range of imported channel steel is generally 6-15m.