Profile pipe: dimensions. Steel profile pipes

The profile pipe, the dimensions of which correspond to GOST, is a kind of pipe rolled. Such products differ in non-standard form, as regards the cross-section. If you compare with round products, the cross-section of the profile pipe may have the shape of an oval, a square, a rectangle or a rectangle with rounded faces.

Scope of use

The profile pipe, the dimensions of which can be very different, is not intended for laying pipelines, but for frame metal structures. The hollow tube has the same stiffness as the all-metal rod, which is true in the case when the dimensions of the profile product are equivalent to the dimensions of solid steel. At the same time, the weight of the hollow article will be 40% less compared to the all-metal version. The profile pipe, the dimensions of which make it possible to realize all kinds of projects, reduces the cost and weight of metal structures, leaving the dimensions and strength of the structure unchanged. However, such savings can only be made if the dimensions are controlled during the manufacture of profile products.

Dependence of the profile pipe dimensions

The profile pipe, the dimensions of which are determined by three parameters, among which the width, height and thickness of the walls, can be made in a certain way. In industrial production, there are three technological processes for manufacturing the described rolled products, among them: hot deformation, cold deformation, and also forming the profile with further welding of the joints. The technological process affects the calibration method, the wall thickness and other pipe dimensions.

Hot-rolled products size

The profile tube, the photo of which can be considered in the article, can be produced by a method that involves hot-rolled technology. The material is heated to increase plasticity, while it takes the form of a sleeve or glass. Rolled by forming rollers to convert a product with a circular cross-section into a pipe with a certain profile. The semi-finished product enters the molding machine, which transports the round tube into a rectangular, oval or square tube. After the workpiece is cooled, rolled on the rollers. If a square profile pipe was obtained during production, the photo of which is presented in the article, then the dimensions of the section can not be less than 60 millimeters. If we consider the range of rectangular products, which are determined by GOST 8645-68, then similar sizes will be about 20. The same number of sizes contains GOST 8639-82.

The last of these state standards determine the dimensions of products with a square profile. In both cases, the cross-sectional dimensions vary from 60 x 60 to 230 x 100 millimeters. However, hot-rolled pipes with a square profile provide for another limit of cross-sectional dimensions. In this case it is a square with a side of 180 millimeters. If a rectangular shaped pipe was produced by the method of hot deformation, then the next parameter affected by the technology is the wall thickness. In this case, the pipe can be square or rectangular, and the parameter should not be less than 4 millimeters. As for the maximum thickness according to GOST 8639-82, it is 14 millimeters.

Length of profile pipe

A rectangular shaped pipe can have different lengths. At the same time, this figure can be a dimensional one, which provides for the equality of a certain segment, or excessive, which implies finding parameters within the segment. And it does not matter what form the final product will have, the dimensions of the product from this will not change. The minimum length is equivalent to 4 m, while the maximum value is 12.5 m.

Dimensions of cold-rolled pipes

The steel profile pipe can also be manufactured using cold deformation technology. As a result, it is possible to obtain an article that has more subtle characteristics than a hot-rolled version. The main characteristics that determine the properties of this product are the dimensions of the section and the thickness of the wall. The dimensions of the section according to GOST can not be less than 10 millimeters. The largest dimension of the face does not exceed 120 millimeters. Thus, a cold-rolled steel profile pipe can not have a profile, the dimensions of which are less than 10x10 millimeters. The largest section size of such a pipe is 120x120 millimeters. Under this standard, there are 17 standard sizes, which belong to GOST 8639-82 a, and 16 sizes, referring to GOST 8645-68.

The cold-rolled galvanized profile pipe has a wall thickness from 1 millimeter to 8 millimeters. The choice of such products is justified in the event that there is a need for a product that is free of seams and has thin walls. The length of such pipes, which are made in the form of dimensional segments, varies from 4, 5 to 11 cm. And the length of cold-rolled products made in the form of non-dimensional segments varies from 1.5 to 9 meters.

Dimensions of welded profile pipes

The profile galvanized pipe can be welded. At the first stage, a sheet measuring blank is formed, which is separated from the steel sheet. Then the bent elements are formed from the billet, and then the weld is welded. The process uses inert gas or induction melting. The result is a profile pipe, the price of which will be indicated below. Its physical properties are almost the same as the characteristics of seamless products. High-quality seam can reduce the rigidity of the product by only 10%. Reducing stiffness makes it possible to produce an article whose walls can have a thickness in the range of 1 to 5 millimeters. Dimensions in this case can vary from 10x10 to 100x100 millimeters.

Length of welded profile pipe

The profile pipe 40 * 40, as well as the product with a different cross-section, can have a measured and non-dimensional length. In the first case, the length is within the range of 5 to 9 meters. In the second - the figure can vary from 1.5 to 9 meters.

Oval tubes with oval section

In addition to square and rectangular products, by means of a welded production, it is possible to manufacture oval pipes. Their dimensions are determined by GOST 8642-68. According to this document, pipes can be found on the market, the sizes of which vary from 16x10 to 90x32 mm. The wall thickness of such a product is not more than 2.5 millimeters, as for the minimum value, it is equal to 1 millimeter.

Cost of a profile square tube

If you are interested in a profile pipe, the price of this product should interest you. For one running meter of a pipe, square section, with a side of 15 millimeters will have to pay 94 rubles. Weight of 1 running meter at the same time is 0.57 kg. If we are talking about a more impressive section in 20x20, for it we have to pay 147 rubles / running meter. The thickness of the wall will be 1.5 millimeters, the weight of the running meter is equivalent to 0.95 kilograms. The profile pipe 40 * 40 at a wall thickness of 1.5 millimeters is 296 rubles per running meter. With an increase in the wall to 2 millimeters, the price rises to 377 rubles. One running meter at the same time weighs 2, 6 kilograms. This can be important when ordering transport.

The pipe profile of rectangular cross-section 60x40 costs 344 rubles per running meter, which is true for a wall thickness of 1, 5 millimeters. An increase in the last parameter to 2 millimeters raises the cost to 493 rubles. The product of a square section 100 x 100 costs 1377 rubles per running meter. The wall thickness is 3 millimeters. A pipe of rectangular cross section 100x50 from a wall of 3 millimeters costs 1007 rubles per running meter. You can choose products for yourself, the sizes of which correspond to the purposes. A great number of pipes of profile cross-section that have different lengths and also wall thickness are on sale.

The need to control the size of profile pipes

Consumers quite often wonder why the profile sizes, which are manufactured according to state standards, are so important. The answer to this question is an example of use - such pipes are used in loaded frames, so even a slight deviation in the dimensions of the cross section can affect the final strength of the metal structure. Products whose dimensions do not comply with state standards can be called dangerous, as their use can lead to negative consequences for the type of failure of the entire structure.