Features of channels 8

Channel - a metal beam with a U-shaped section. Due to the unique combination of strength and lightness, channels are widely used in construction and mechanical engineering. In this material, we will consider channel 8.

The number, which is used to mark the rolled steel, determines the width of its wall - the fact that the letter "P" is a horizontal crosspiece. Thus, the channel 8 has a width of this very wall of 80 mm. The flanges of the beam - that which the letter "P" is located vertically - play the role of stiffeners, resisting bending or twisting. At the same time, the technology for manufacturing a beam can significantly affect its mechanical properties. Thus, products produced by hot rolling, unlike those produced by bending a steel plate, have no internal stresses.

The variety of channels of the same size group necessitated the creation of a large number of GOST standards. The difference is caused by the various requirements for the specified metallurgical products. Differences arise not only due to different production technologies, but also due to the use of different grades of steel. Channel 8, produced by rolling hot steel, has flanges with a certain slope (4 ° -10 °) of the inner edges. This is due to the technological features of production. Such products are marked as 8U (with a bias). Beams obtained by bending a steel plate do not have such a slope; they are designated as 8P (with parallel flanges).

The bent channel with unequal shelves has the designation "C" (special), it is produced in limited quantities under the order of the enterprise. Beams manufactured from a thinner sheet, marked with letters "E" (economical) and "L" (easy). Metallurgical products can be manufactured with varying degrees of accuracy, which affects the cost of production. Hire produced with maximum compliance with GOST, is labeled as class "A" products. Made with some deviations rental can be marked as class "B"... Both of these classes are in demand in mechanical engineering. Class "B" products, called ordinary rolled products, most often used in construction, it is such products that go to retail.

According to GOST, channel 8 has the following characteristics: the wall width is 80 mm, the width of the shelves of a conventional equal-flange product should be 40 mm. The wall thickness should be 4.5 mm. The thickness of the shelves in bent rolled steel 8P is the same as at the wall. For a hot-rolled U-channel, the thickness of the shelves decreases towards their edge, and at the junction with the wall it can reach 7.4 mm.

However, the mass of 1 meter of the G8 should be close to 7.05 kg in one way or another. Thus, a ton of products contains 141.8 running meters. A special perforated and unequal channel channel has different characteristics. The length of the beams produced can be different: 4, 6, 12 meters.

The mechanical properties of channel 8 (relative lightness and sufficient strength) largely determined the scope of its application. One of the most important uses of this steel beam is mechanical engineering. Such rolling can be found in the structures of automobile and tractor frames.Often it is he who goes to the assembly of cranes and power line supports. The beds of some machine tools are also assembled from channel 8. Special hire is required for the construction of wagons.

In construction, a U-shaped beam is used both as an independent product and as an element of a reinforced concrete structure. It can be used for the installation of interfloor ceilings, window and door openings. Roof structures and access canopies are made from channel 8. Perforated channel serves as an excellent base for metal structures (hangars, warehouses, bridge structures). This product is widely used for reinforcing reinforced concrete structures.