Good material for modern industry: channel steel

Channel steel is a Long Steel with a groove-shaped cross-section, which is a carbon structural steel for construction and machinery, and is a section steel with complex cross-section, and its cross-sectional shape is groove-shaped.Channel steel is mainly used in building structures, 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 billet for channel steel is carbon knotted steel or low-Alloy Steel billet with a carbon content of no more than 0.25%. The finished channel is delivered in hot-formed, normalized or hot-rolled condition. 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. Channel steel with the same waist height, if there are several different leg widths and waist thicknesses, you also need to add a b c on the right side of the model to distinguish, such as 25 # a 25 # b 25 # c and so on.
classify
Channel steel is divided into ordinary channel steel and light channel steel. The specification of hot-rolled ordinary channel steel is 5-40#. The specifications of hot-rolled flexible channel steel supplied by 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 panel cabinets, etc., and channel steel is often used in conjunction with I-beams.
According to the shape, the channel can be divided into 4 types: cold-formed equal-sided channel, cold-formed unequal channel, cold-formed inner curling channel, and cold-formed outer curling channel.
According to the theory of steel structure, it should be the channel steel wing plate stressed, that is, the channel steel should be upright, not lying on its stomach.
numbering
(1) Use the international chemical element symbol and the national symbol to represent the chemical composition, and use the Arabic alphabet to indicate the ingredient content:
Such as: China, Russia 12CrNi3A
(2) Use a fixed number of digits to represent the steel series or numbers; Such as: the United States, Japan, 300 series, 400 series, 200 series;
(3) Use Latin letters and sequences to form serial numbers, which only indicate the purpose.
Specification setting
The specifications of the channel steel are mainly expressed by the height (H), leg width (B), waist thickness (D) and other dimensions, and the domestic channel steel specifications are from 5 -40, that is, the corresponding height is 5 -40cm.
At the same height, light channel steel has narrower legs, a thinner waist and a lighter weight than ordinary channel steel. No. 18 -40 is a large channel, and No. 5 -16 is a medium-sized channel. Imported channel steel is marked with actual specifications 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. Aside from the specification number, there is no specific composition and performance range for channel steel.
The delivery length of channel steel is divided into two types: fixed length and double ruler, 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.