The channel bar— assortment of structural shapes,

the design of which is a solid metal profile of U-shaped section. Hot-rolled steel channel is of General and special purpose height from 50 to 400 mm and width from 32 to 115 mm.
The channel is designed to give rigidity and stability of structures. It is most often used in large structures such as bridges, floor structures, columns, large girders, stairwells. Channels respond well to longitudinal load and bending work, thereby increasing strength and reduced mass of the structure.
Channels are divided into:
-hot-rolled steel (GOST 8240-89);
-steel special (GOST 19425-74);
-steel bent angle (GOST 8278-75);
-steel bent unequal (GOST 8281-80).

Channel (GOST 8240-89) is divided into:
channel with a bias of internal sides of shelves (At): № 5; 6,5; 8; 10; 12; 14; 16; 16A; 18; 18a; 20; 22; 24; 27; 30; 33; 36; 40
channel with parallel faces of shelves (P): № 5P; 6,5 P; 8P; 10P; 12P; 14P; 16ap; 18P; 18ap; 20P; 22P; 24P; 27P; ZOP; ZZP; 36P; 40P