A profile pipe, the dimensions of which correspond to GOST, is a type of pipe hire. Such products have a non-standard shape with regard to the cross section. If you compare with round products, the cross section of the profile pipe may have the shape of an oval, square, rectangle or rectangle with rounded edges.
Area of use
A profile pipe, the sizes of which can be very different, is intended not for laying pipelines, but for frame metal structures. A hollow pipe has the same rigidity as an all-metal rod, which is true when the dimensions of the profile product are equivalent to the dimensions of all-metal rolling. At the same time, the weight of the hollow product will be 40% less compared to the all-metal option. Profile pipe, the dimensions of which allow implementing various projects, reduces the cost and weight of metal structures, leaving the dimensions and structural strength unchanged. However, such a saving takes place only when the dimensions are controlled during the manufacture of profile products.
The dependence of the size of the profile pipe
A profile pipe, the dimensions of which are determined by three parameters, among which the width, height and wall thickness, can be made by a certain method. In industrial production, there are three technological processes for the manufacture of the described rolled products, among them: hot deformation, cold deformation, as well as profile forming with further welding of joints. The technological process affects the calibration method, wall thickness and other pipe sizes.
Hot Rolled Size
A profile pipe, the photo of which can be considered in the article, can be made by a method that involves hot-rolled technology. The material is heated to increase ductility, while acquiring the shape of a sleeve or glass. It is rolled by molding rollers to turn a product with a circular cross section into a pipe with a specific profile. The semi-finished product enters the molding press, which transports the round pipe into a rectangular, oval or square. After the workpiece is cooled, rolled on the rollers. If during the production a square profile pipe was obtained, the photo of which is presented in the article, then the cross-sectional dimensions cannot be less than 60 millimeters. If we consider the assortment of rectangular products, which are determined by GOST 8645-68, then there will be about 20 similar sizes. The same number of sizes contains GOST 8639-82.
The last of the mentioned state standards determine the dimensions of products with a square profile. In both cases, the dimensions of the section vary from 60 x 60 to 230 x 100 millimeters. However, hot rolled tubes with a square profile provide a different limit on the size of the section. In this case, it is a square with a side of 180 millimeters. If a rectangular profile pipe was produced by hot deformation, the next parameter that the technology affects is the wall thickness. In this case, the pipe can be square or rectangular, and the mentioned parameter should not be less than 4 millimeters. As for the maximum thickness according to GOST 8639-82, it is 14 millimeters.
Profile Pipe Length
A rectangular profile pipe may have different lengths. Moreover, this figure can be dimensional, which provides equality to a certain segment, or unmeasured, which implies finding parameters within the segment. And it doesn’t matter what shape the final product will have, the dimensions of the product will not change. The minimum length is equivalent to 4 m, while the maximum value is 12.5 meters.
Dimensions of Cold Rolled Tubes
Steel profile pipe can also be manufactured using cold deformation technology. As a result, it is possible to obtain a product that has finer characteristics compared to the hot-rolled version. The main characteristics that determine the properties of this product are section dimensions and wall thickness. The cross-sectional dimensions in accordance with GOST can not be less than 10 millimeters. The largest face size does not exceed 120 millimeters. Thus, a cold-rolled steel profile pipe cannot have a profile whose dimensions are less than 10x10 millimeters. The largest cross-sectional size of such a pipe is 120x120 millimeters. 17 standard sizes that belong to GOST 8639-82 , as well as 16 standard sizes related to GOST 8645-68, are suitable for this standard.
The cold-rolled profile galvanized pipe has a wall thickness of 1 millimeter to 8 millimeters. The choice of such products is justified if there is a need for a product that is devoid of seams and has thin walls. The length of such pipes, which are made in the form of measured segments, varies from 4, 5 to 11 cm. And the length of the cold-rolled products made in the form of non-measured segments varies from 1.5 to 9 meters.
Dimensions of welded shaped tubes
The profile galvanized pipe can be welded. At the same time, at the first stage, a sheet measured blank is formed, which is separated from the steel sheet. Further, bent elements are formed from the workpiece, and then the seam 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 no different from the characteristics possessed by seamless products. A high-quality seam can weaken the stiffness of the product by only 10%. Reducing stiffness makes it possible to manufacture an article whose walls can have a thickness in the range of 1 to 5 millimeters. Dimensions can vary from 10x10 to 100x100 millimeters.
Welded Profile Pipe Length
Profile pipe 40 * 40, as well as a product with a different cross-section, can have a measured and non-measured 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 pipes with oval cross-section
In addition to square and rectangular products, through welded production it is possible to produce oval pipes. Their sizes are determined by GOST 8642-68. According to this document, on sale you can find pipes whose sizes vary from 16x10 to 90x32 millimeters. The wall thickness of such a product is not more than 2.5 millimeters, with regard to the minimum value, it is equal to 1 millimeter.
The cost of a square profile pipe
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, you will have to pay 94 rubles. The weight of 1 running meter in this case is 0.57 kilograms. If we are talking about a more impressive cross section of 20x20, you will have to pay 147 rubles / linear meter for it. The wall thickness will be 1.5 millimeters, the linear meter weight is equivalent to 0.95 kilograms. A profile pipe 40 * 40 with a wall thickness of 1.5 millimeters costs 296 rubles per linear meter. With an increase in the wall to 2 millimeters, the price rises to 377 rubles. One linear meter weighs 2, 6 kilograms. This can be important when ordering a vehicle.
A profile pipe of rectangular cross section 60x40 costs 344 rubles per linear meter, which is true with a wall thickness of 1.5 millimeters. Increasing the last parameter to 2 millimeters increases the cost to 493 rubles. A 100 x 100 square-section product costs 1377 rubles per linear meter. The wall thickness is 3 millimeters. A pipe of rectangular cross section 100x50 from a wall of 3 millimeters costs 1007 rubles per linear meter. You can choose for yourself products whose sizes correspond to the goals. A great many pipes of profile section are on sale, which have different lengths and wall thicknesses.
The need to control the size of profile pipes
Consumers quite often wonder why the dimensions of core products, 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 cross-sectional dimensions can affect the final strength of the metal structure. Products whose dimensions do not comply with state standards can be called dangerous, since their use can lead to negative consequences for the type of breakdown of the entire structure.