Channel 20: application, size, weight

Channel bars 20, due to its design, wall thickness and foothills, are used in the construction of massive high-rise buildings, industrial facilities. They are produced from hot-rolled steel in accordance with GOST 8240-97. Shelves are located on one side of the wall. In contrast to the zeta profiles, standard sizes and weights are produced, with deviations of 5%. Given that these channels can have a different angle of inclination of the walls, it is recommended that you familiarize yourself with the technical characteristics and the field of application of metal structures before purchasing.

What are the steels made of channel 20?

Proceeding from GOST 8240-97, channel bars 20 are made of hot and cold rolled steel. The type of steel used in the production of the channel is indicated in the marking. The hot-rolled channel is more durable, it is used for the erection of load-bearing walls in structures made of metal structures. They are able to cope with local bending vertically, stand up to horizontal movements. Cold-rolled channel 20 is more used for floors where detailed calculations of load-carrying capacity of buildings are not carried out.

Dimensions and characteristics of channel 20

Channel 20 (weight 1 meter 18.95 kg) is produced in two versions:

1. Type Y. It has a slope of internal faces, the angle is 4-10 degrees.
2. Type P. Channel with parallel walls.

Typical sizes of channels U20:

• 200 mm - the width of the wall;
• Standard shelf width up to 76 mm;
• The walls have a thickness of 5.2 mm, and the thickness of the shelf is up to 9 mm with a fluctuation of up to 0.5%;
• Radius of rotation at the junction of the inner edge of the shelf and walls - 9.5 mm;
• In a ton of finished products there will be about 54.43 m of the channel.

Channel bars of series P

Many sizes and parameters fully correspond to the U20 channel, only the radius of the outer curvature of the shelf is up to 5.5 mm, the inner turn is up to 9 mm. The weight of the channel is slightly smaller, therefore there are more designs in a ton of finished products.

The weight of the channel is calculated in accordance with the type of steel used at a density of 7850 kg / m ³ . This is a reference value. This parameter also depends on the composition, since the thickness of the walls can vary within 1%.

Parameters of the length of the private channel

At the production facilities, all the channels are produced in the form of a single strip, which is cut on the machines by a length within 2-12 meters. Length depends on a number of conditions, some are set by manufacturers, others by metal stores:

• Measured length. It is 1,1-2,0 meters.
• Combination of dimensional and non-dimensional length with the composition of the batch lot in the delivery group up to 5%.
• Multiple measuring length.
• Only an unmeasured length is 1.1 meters.
• Under the individual order of the buyer.

The channel in the lot is 4.5-8 tons thick, it is tightened with steel tape in several places. At the ends of the lot, marking tags are set on which the channel marker , dimensions and type are indicated. The mode of transportation is automobile and railway transport.

Scope of application

Channel bars of grade 20 are used in the construction of load-bearing steel structures for industrial and residential buildings, as well as for erecting trusses and arched ceilings. The products are suitable for the construction of pile-and-foundation foundation and as a support for small automobile bridges. When buying products it is recommended to make minimum of welding joints, it is better to initially install ready-made monolithic structures without intermediate joints. If necessary, welding is allowed in the places of installation of vertical supports and struts.

Channel 20 reviews received the most positive. The builders noted the high strength, reliability and economy of this material, as well as ease of installation, excellent weldability, which speeds up and facilitates the construction process.