The characteristic shape of this rolled metal and its strength characteristics made it relevant to use it in various sectors of the national economy. Depending on the scope of application, choose different types and sizes of channels. They are used in residential and industrial construction, mechanical engineering, car building, during various repairs, for the manufacture of racks and reinforcement of ceilings, in outdoor advertising and for the installation of ramps.
Channel bars are actively used as a structural element in the manufacture of cranes, bridges, high-voltage power transmission towers, oil rigs, any building frames and for closing communications. Wherever serious material strength with relatively low weight plays an important role.
Types of channels
The main material for the production of these products is steel (structural carbon, low-alloy, hot-rolled and cold-rolled). There are hot-rolled (with ordinary and increased rolling accuracy) and bent channel.
Hot-rolled steel is characterized by the parallelism of the shelves, but they can also be made with a slope (no more than 10%). The dimensions of channels for general or special purposes (in particular, for the automotive industry) differ in the width and height of the shelves (dimensions are given in GOST 8240-89 and 19425-74). A separate GOST exists for profiles for car building (GOST 5267.1-90).
The bent product is visually distinguished by the presence of a rounded inner corner of the shelves and can be equal-shelf and unequal-shelf. It has such a channel with dimensions (GOST 8278-75) up to 12 meters long, however, longer profiles are also produced to order.
Channel sizes
When choosing a profile, they are guided by its main parameters, which determine the height, width and thickness of the shelf, wall thickness, the radius of the internal rounding or rounding of the shelves.
There are many varieties, sizes and characteristics that are regulated by standards. Therefore, the quality of the product is easy to determine by comparing the actual dimensions of the channels with those specified in GOST.
Subtleties of marking
When marking a profile, dimensions are usually indicated in centimeters and a letter indicates an individual parameter. For example, an 8P channel, whose dimensions are standard, indicates that its height is 8 centimeters, and the shelves are parallel. By the way, products with this size are mainly used for reinforcing buildings, since they are welded without problems, and are made from semi-calm and calm carbon steel.
To reduce the metal consumption of construction, a 12P channel is also used, which differshigher strength properties. But the hot-rolled profile 16P is the most popular.
The specifics of the use of rolled metal often depends on the grade of steel that is used for its production. For example, for applications in the Far North, where low temperatures are the norm, use channels made of low-carbon structural steel 09G2S. This is due to the high mechanical strength of this steel grade, ease of welding, resistance to low temperatures.
