Profile pipes actively used in construction, mechanical engineering, furniture production and other areas are presented on modern market in great variety. In order to streamline this diversity and classify these products according to certain criteria, such a concept as assortment was introduced.
The very word "assortment", if we turn to dictionaries, comes from the word "variety" and means a list of individual types of products that are on the market. In relation to shaped pipes, the range means a set of types of these products manufactured manufacturing enterprises or available in the supplier's warehouse.
The range of pipes is presented in the form of a table or simple list, wherein certain types products are listed in accordance with their names in accordance with GOST 13663 86 (profile square, profile rectangular pipes, etc.). Such a table or list should contain all available types of pipes, for each of which all names are signed and characteristics are given.
The assortment of pipes belonging to the profile category is very diverse. They are classified according to various parameters, but the main one is the cross-sectional profile. So, pipes are distinguished:
- with a rectangular profile;
- square section;
- flat oval;
- oval;
- with hollow ribs;
- with a special type of profile.
The assortment is compiled separately for each type of pipe, which is regulated by the requirements of the relevant GOSTs.
The main parameters of the most common profile pipes - square and rectangular sections
Metal pipes belonging to a particular type of profile can also differ in a number of ways. The main of these parameters include:
- the method by which pipes are produced (they are cold and hot rolled, welded);
- materials used in production;
- method of processing the ends of pipes;
- main purpose.
The assortment of pipes, which is presented by a certain manufacturer, not only allows you to get acquainted with the range of its products, but also serves as an indicator of the level of its development. Consumers of such products and organizations selling them prefer to establish relationships with manufacturing enterprises, the range of pipes of which includes a wide range of products.
Assortment of profile pipes of rectangular section: GOST 8645-68
The most obvious information about the assortment of steel rectangular pipes is presented in the corresponding GOST, which is presented below.
Assortment of profile pipes of square section: GOST 8639-82
To get acquainted with the assortment, it is worth viewing the data from the corresponding GOST, which is presented below.
Criterias of choice
Of the entire assortment of modern profile pipe rolling, products with square and rectangular sections are the most common. Traditionally, they are made of metal, but now this material is increasingly being replaced by plastic.
The main field of application of profiled pipe is the production of metal structures for various purposes, where these products are successfully replaced with solid steel bars. The big advantages of pipes compared to such bars are affordable cost and low weight.
When choosing profile pipes from the assortment for the manufacture of a metal structure, it is very important to correctly select their profile and cross-sectional dimensions. The main criterion that guides this choice is load bearing capacity pipes, both square and rectangular. It should also be taken into account that products with different sizes cross sections can vary considerably in weight.
According to the production method, as already noted above, cold- and hot-formed steel profile pipes are distinguished in the assortment. In accordance with the requirements of GOST 13663 86, this also includes products manufactured using electric welding. These pipes, as well as cold-formed ones, can be covered with a layer of zinc, which prevents corrosion.
The cross-sectional dimensions of the profile pipe, the most in demand on construction market, are:
- 15x15;
- 20x20;
- 25x25;
- 30x30;
- 40x40;
- 60x60;
- 80x80;
- 100x60;
- 100x100.
Advantages of profile pipes
The profile category includes all pipes whose cross-sectional shape differs from round. The most widespread of the entire assortment are products with a square and rectangular profile, the dimensions of which correspond to 25, 60, 100, 40x80, 40x100, 50x50 mm.
Steel profile pipes, the dimensions of which exceed 100 mm, are used mainly as structural elements. Such products, which have four stiffeners, are distinguished by high strength characteristics and low specific gravity.
Products with a profile of 60 mm perfectly resist bending, due to which they are successfully used in construction and in the arrangement of various engineering communications.
Any profile pipes allow not only to create complex steel structures, but also significantly save on the cost of expensive metal.
Among the advantages of profile pipes made of steel, the following can be mentioned.
- Their entire assortment is characterized by low metal consumption, which makes it possible to save up to 25% of metal even during the construction of one building object.
- When using such elements, construction objects are erected with high efficiency.
- The entire range of profile pipes produced by modern industry meets sanitary and hygienic requirements, the pipes are easy to maintain and disinfect.
- These products also meet anti- fire safety.
- Even the most complex structures when using these elements, they are mounted with maximum efficiency.
Applications
Steel pipes having various types of profile are actively used in many areas. Depending on the size of the profile, such products are used to solve the following tasks.
- Pipes with a profile of 60x30 are characterized by low metal consumption, their use makes it possible to significantly save on the cost of metal during construction work.
- For mounting metal structures various sizes and the degree of complexity, pipes with profile sizes of 15x15, 40x60, 60x60 and 100x100 are most actively used.
- A number of advantages distinguish products with a profile size of 25x25. Such advantages include low weight, exceptional strength characteristics, tightness, ease of installation work.
The scope of application of profile pipes is extremely diverse, so it is worth talking about their advantages and disadvantages in more detail. In this material, we will talk about the assortment of profiled pipes, as well as what product qualities you should pay attention to when buying them.
The very concept of "assortment" implies a wide variety of varieties and types of certain products, and in this context - profile pipes. As a rule, it helps to determine the presence various types products, classified according to a number of parameters, which are available from manufacturers or at wholesale or retail outlets.
The full range of profile pipes includes all, without exception, the names of these products, manufactured in accordance with GOSTs, and also describes the quality characteristics of each category in all possible modifications.
In general, the classification of profile pipes can be carried out according to various indicators. One of the most significant characteristics is the profile form.
There are such types of products:
- oval;
- flat oval;
- square;
- rectangular shape;
- with hollow ribs;
- with a specially shaped profile.
It should be noted that the assortment of steel profile pipes is developed separately for each type of profile in full accordance with GOSTs.
In addition, the variety of profile pipes is also determined by factors such as:
- method of production of pipe products - welded, cold or hot rolled);
- raw materials from which pipes are made;
- methods of processing end parts;
- industry where the use of certain types of pipes is provided.
By the size of the range of products presented on the market by the manufacturer, one can judge its potential, capabilities and scale of production. And although the expansion of the list requires significant costs, it nevertheless indicates the stability of the enterprise.
Detailed description of the assortment
Very wide application obtained profile pipes in the process of assembling metal structures for various industrial facilities. They are not only able to replace the bars used for load-bearing structures, but also have a small mass and are inexpensive.
In addition, when choosing the type of pipes, it is worth considering the mass running meter such products.
Most often, square rectangular pipes with the following parameters are in demand:
- 15×15 mm;
- 20×20 mm;
- 25×25 mm;
- 30×30 mm;
- 40×40 mm;
- 60×60 mm;
- 80×80 mm;
- 100×160 mm;
- 100×100 mm.
Advantages and disadvantages of various profiled pipes
Profile pipes are all pipes whose cross-sectional shape is not round. The most common are square rectangular steel pipes. The most common profile sizes are 25, 60, 100 mm and 40×80 mm, 50×50 mm and 40×100 mm.
It should be noted that due to the variety of manufactured standard sizes of profiled pipes, it has become possible to build more and more complex structures.
Among the main advantages of profile pipes are:
- low metal content, which allows saving up to 25% of raw materials for the construction of a particular object;
- due to the ease of installation, the construction of the structure is carried out very quickly;
- convenience in sanitary and antiseptic treatment, hygiene;
- full compliance with fire safety standards;
- the possibility of assembling structures of increased complexity.
The area of \u200b\u200buse of pipes from the profile
Due to the variety of sections and shapes of profile pipes, their scope is extremely wide.
In particular, the use of such products will be appropriate in such cases:
- To assemble the frame of buildings, if there is a need to save metal, profile pipes with a cross section of 60 × 30 mm are often used.
- As structural elements, pipes with dimensions of 15 × 15 mm, 40 × 60 mm, 60 mm and 100 mm are acceptable.
- Among the advantages of products with parameters 25 × 25 mm and others, one can name the moment of resistance of a profile pipe, that is, its strength, low weight, high speed and ease of assembly of metal structures from them, as well as high tightness.
- Good performance indicators of profile pipes, as well as their versatility, make it possible to use them in almost any field of activity. In particular, profiled products with dimensions of 25×250 mm are actively used in the machine-building industry. But pipes 60 × 30 mm are in demand for the assembly of billboards and banners.
- In the construction of large facilities housing stock, public buildings, as well as warehouses and garages, pipes with parameters of 40 × 60 mm are in great demand, as well as many other types.
Thus, it can be noted that pipes of various profiles, in particular square, rectangular and other types, are very common in the construction of objects for various purposes. If the construction of light partitions or structures that will not bear a large load is required, then profiled pipes with thin walls are perfect for these purposes.
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The concept of assortment
What is a "range"? The meaning of the word means a list of a specific product on the market or a list of products manufactured by a manufacturer.
If we take profile pipes, then the range of these products includes all types of products that are produced at enterprises or are in the warehouses of suppliers.
It is convenient to present the assortment of profile pipes in the form of tables. They contain, among which square and rectangular parts of a wide range of products are most often used.
Profile is one of the main parameters of the details presented in the table. In addition, it may indicate the steel grade, profile size, wall thickness of products, yield strength, manufacturing method, and other characteristics, having familiarized ourselves with which we have a complete picture of the product.
GOST 13663 86
In this State Standard profile pipes made of steel of both seamless and welded type for general purposes are presented. Various groups of grades of carbon and alloy steel are used for manufacturing.
The linear parameters of profile steel risers are recorded in special tables that can be easily found on the Internet.
Elements can be:
- with hollow ribs;
- flat oval shapes;
- oval and drop-shaped sections;
- square();
- rectangular ().
The assortment provides for the presence of 2 groups of profile pipes, according to GOST:
- products of group A: standardized mechanical properties become;
- products of group B: availability is normalized chemical elements in a specific proportion mechanical characteristics base metal.
The index of the product group when it is marked - A or B, is affixed before the steel grades.
The assortment provides for the presence of steel profile pipes with and without heat treatment.
Non-specialists in this industry sometimes talk about the assortment of steel profile pipes GOST 13633 86. It turns out that such a Standard does not exist at all, but the numbers, probably, were simply mixed up and instead of 13663 they call 13633. That's all. So you need to be extremely careful and precise before talking about State Standards.
Let us dwell on rectangular and square elements, which are more in demand in comparison with analogues of other sections.
Rectangular pipes GOST 8645 68
As stipulated in the Standard and accordingly, pipes can be produced:
- in a seamless way (hot and cold deformation);
- welding method (electric welding with hot and cold calibration, furnace welding).
As GOST 8645 68, square analogues of GOST 8639 82 are used in practice, the assortment of which is also quite large.
The shape of the rectangular elements should be the same as in the drawing. 
In table 1, you can also use some parameters of rectangular general-purpose products.
Table 1
| Section length | Section width | Wall thickness | Cross-sectional area | Weight 1 m | Moment of resistance | |
| mm | cm 2 | kg | cm 3 | |||
| 15 | 10 | 1 | 0,44 | 0,349 | 0,132 | 0,166 |
| 2 | 0,772 | 0,606 | 0,178 | 0,238 | ||
| 20 | 10 | 1 | 0,544 | 0,424 | 0,174 | 0,266 |
| 2 | 0,972 | 0,763 | 0,246 | 0,399 | ||
| 25 | 10 | 1 | 0,644 | 0,504 | 0,211 | 0,371 |
| 2 | 0,18 | 0,918 | 0,311 | 0,591 | ||
| 40 | 15 | 2 | 1,96 | 1,56 | 0,921 | 1,72 |
| 4 | 3,49 | 2,72 | 1,18 | 2,52 | ||
| 25 | 1,5 | 1,81 | 1,42 | 1,48 | 1,96 | |
| 4 | 4,29 | 3,37 | 2,82 | 3,82 | ||
| 60 | 30 | 1,5 | 2,58 | 2,01 | 2,72 | 4,01 |
| 5 | 7,56 | 5,95 | 6,18 | 9,87 | ||
| 40 | 1,5 | 2,86 | 2,26 | 3,91 | 4,86 | |
| 5 | 8,56 | 6,74 | 9,58 | 12,38 | ||
| 80 | 40 | 2,0 | 4,67 | 3,58 | 6,42 | 9,48 |
| 7 | 14,01 | 10,98 | 14,98 | 23,95 | ||
| 60 | 3,5 | 9,11 | 7,13 | 17,22 | 20,22 | |
| 7 | 16,81 | 13,18 | 27,82 | 33,31 | ||
| 180 | 80 | 7 | 33,61 | 26,38 | 89,43 | 145,2 |
| 12 | 54,27 | 42,51 | 125,8 | 214,1 | ||
| 150 | 8 | 49,24 | 38,67 | 228,8 | 253,4 | |
| 12 | 70,98 | 55,61 | 310,81 | 346,01 | ||
Application features
Risers are made in close correlation of linear parameters with wall thickness. Thanks to stiffening ribs, the design of rectangular parts is durable, reliable, long service life and other positive properties.
Rectangular risers are used in:
- construction industry. With their help, bearing structures for objects of sports, cultural and mass purpose, offices, other premises. Rectangular parts make perfect railings, various decorative fences;
- mechanical engineering. Modern tractors, agricultural machinery, heavy vehicles, trailers are mounted on frames made of hollow rectangular risers. A small mass in combination with high strength is the main condition for creating reliable metal structures;
- agriculture. The constructed greenhouses, greenhouses, sheds for seeds, machinery, and other structures can easily withstand serious both transverse and longitudinal loads;
- furniture industry. Such risers are available in every school desk, in every chair. They supply furniture for medical and public institutions. Together with wooden elements they look very aesthetic.
It is impossible to do without them when erecting frames of trade pavilions, sheds, temporary and permanent advertising structures.
With their help, devices are mounted that contribute to the performance of work inside and outside the premises.
Effective interaction with planes contributes to the expansion of product applications. Due to the rectangularity of structural details, the range of functional purpose of the final product is significantly expanded.
Despite saving metal in production, rectangular risers are a fairly high-quality, sought-after product. Rectangular parts are affordable for consumers, which is associated with a competitive cost of goods and high quality.
GOST 8639 82
This Standard refers to the range of square profile pipes, for the manufacture of which they use:
- in a seamless way (hot and cold deformed elements);
- by electric welding (cold-formed, hot-calibrated parts).
The document applies to the range of GOST 8639 82 profile pipes of square section, for the production of which furnace welding was also used.
Depending on the method of manufacture, purpose, steel grades, parts can be different lengths With different thickness walls, different sections and outer dimensions (Table 2):
table 2
Maximum error according to overall length is no more than +100 mm.
The drawing indicates the form, and table. 3 for dimensions and other parameters of profile square pipes GOST 8639 82. 
Table 3
| outer dimensions, mm |
Wall thickness, mm |
Cross-sectional area, cm 2 |
Weight 1 m, kg |
moment of resistance, cm 3 |
| 10 | 0,9 | 0,316 | 0,245 | 0,851 |
| 1,4 | 0,447 | 0,351 | 0,101 | |
| 15 | 0,9 | 0,493 | 0,389 | 0,216 |
| 1,4 | 0,727 | 0,572 | 0,292 | |
| 20 | 0,8 | 0,605 | 0,475 | 0,369 |
| 1,5 | 1,072 | 0,842 | 0,601 | |
| 35 | 0,8 | 1,082 | 0,851 | 1,201 |
| 4,0 | 4,69 | 3,66 | 4,18 | |
| 50 | 2,0 | 3,74 | 2,98 | 5,73 |
| 8,0 | 12,33 | 9,68 | 13,89 | |
| 100 | 3,0 | 11,47 | 9,03 | 35,78 |
| 9,0 | 31,36 | 24,63 | 84,33 | |
| 180 | 8,0 | 53,93 | 42,33 | 292,68 |
| 14,0 | 89,58 | 70,34 | 449,26 |
Assortment of square profile pipe GOST 30245 2003
This Standard specifies not only the parameters of square products, but also the technology of their production.
One of the main areas of application of such parts is capital construction.
For absolute confidence in the strength, reliability of structures, for their construction it is necessary to use only a range of steel profile pipes that comply with GOST.
The production of an extensive range of profile square risers as a variety of rectangular products is carried out accordingly. Elements can be dimensional, non-dimensional. If necessary, you can purchase parts that are multiples of the measured ones.
slicing individual elements finished products, enterprises adhere to the State Standard.
The document emphasizes that:
- the minimum length of parts cannot be less than 4 m, and the maximum - no more than 13 m;
- more often than others, buyers are interested in finished products with a length of 6 m and 12 m (it is elements with such linear parameters that can be found more often than others in hardware stores);
- when cutting dimensional parts, it is necessary to adhere to the maximum deviations of the order of up to 60 mm;
- the required length is determined by the customer, but it must be within the limits specified in the regulatory documents.
For products with a square section, the Standard requires compliance with the length of the sides, the linear dimensions of which can be in the range from 50 mm to 300 mm. The assortment of goods provides for the correspondence of the thickness of the element to its size. With an increase in the last parameter, the wall thickness should also increase ( minimum value- 2 mm, maximum - 14 mm).
Separate designs foresee the use of risers custom size such parameters: cross-sectional area, wall thickness, length. Such elements must be tested. Released parts must comply Specifications state regulatory body that assesses their level of safety. On the marking of parts there is the designation TU.
The shape of the parts is shown in the drawing. 
With separate parameters for some product sizes
can be found in Table. four.
Table 4
| h | b | t | Cross-sectional area, A cm 2 |
Weight 1 m, kg |
| mm | ||||
| 40 | 40 | 2 | 2,942 | 2,314 |
| 3 | 4,212 | 3,301 | ||
| 4 | 5,351 | 4,202 | ||
| 60 | 60 | 2 | 4,542 | 3,562 |
| 4 | 8,552 | 6,712 | ||
| 6 | 12,031 | 9,451 | ||
| 90 | 90 | 3 | 10,213 | 8,014 |
| 5 | 16,361 | 12,844 | ||
| 8 | 24,042 | 18,873 | ||
| 120 | 120 | 3 | 13,813 | 10,482 |
| 6 | 26,432 | 20,754 | ||
| 8 | 33,643 | 26,417 | ||
| 150 | 150 | 4 | 22,955 | 18,016 |
| 6 | 33,632 | 26,406 | ||
| 8 | 43,241 | 33,955 | ||
| 200 | 200 | 6 | 45,635 | 35,826 |
| 9 | 65,982 | 51,797 | ||
| 12 | 84,063 | 65,997 | ||
| 300 | 300 | 6 | 69,632 | 54,664 |
| 9 | 102,01 | 80,055 | ||
| 12 | 132,12 | 103,72 | ||
About performance and applications
The design of the square riser is a closed profile, for the formation of which a metal strip is used. The quality characteristics that manifest themselves during the operation of products depend on the design features, the material of manufacture. 
This product is different:
- increased resistance to bending and torsion;
- strength;
- reliability;
- small weight;
- long service life.
Today it is difficult to imagine human activity without square risers. They have found wide application in various fields.
Profiles are the basis of modern industrial and domestic construction. Renovating old building objects and constructing new ones, square section details are used to create roof frames, overlays.
It is impossible to imagine functioning without them:
- furniture industry (shelves, racks, chairs, tables, cabinets);
- mechanisms of the machine-building industry;
- agriculture (sheds, garages, utility rooms, livestock farms);
- advertising business, other areas of human life.
Compared to analogues with a round section, square and rectangular profiles bend after high loads. Moreover, after the termination of the load, the riser takes starting position. This is their strength and reliability.
Round products, with a similar impact, can not only be deformed, but also completely destroyed.
Production stages
The assortment of square steel profile pipes GOST 30245 2003 provides for the use of sheet steel grades from carbon and low alloy groups with a sheet thickness of 3 mm, 4 mm and above. Individual orders are made using high-quality grades of rolled steel.
After determining the manufacturing method, product sections, production begins, which foresees several stages:
- Unwinding, cutting of rolled sheet metal into strips of a certain width.
- Formation of a long strip from cut strips by welding.
- Feeding of the tape, formation of products with a square section from it on a molding machine.
- Boiling a connecting longitudinal seam formed as a result of bending the workpiece.
- Removal to a minimum (residue not higher than 0.5 mm - 1 mm) of burr from the weld.
- Carrying out control measures regarding the quality of welds. If deficiencies are found, they are removed.
- Cutting high-quality pieces of products of the required length.
- Packaging of finished items.
Finished packaged products are sent to a warehouse for storage.
Video
Gutters. You should know it!
The drainage system is one of the most important systems outdoor structure at home. This design is not just a decoration for the house, or a tribute to fashion. Gutters are designed to collect and direct the flow of rainwater from the roof of the building to a specially designated place away from the foundation of the building.
How to calculate the drain
Properly working drainage system protects the roof, roof, walls of the house, the basement of the building and the foundation from premature wear. Not to mention the aesthetic component of the benefits of gutters.
They save you from dirt near the house, puddles near the plinth and accidental falls. Consider the most simple questions what should be the drainage system of a residential building. What should be the size downpipes? The size of the pipes depends on which part of the country you live in, on the average annual rainfall and on the area of the part of the roof for which the drain is calculated. 
In a temperate climate, the calculation takes into account that with 1.5 cm² of the cross section of the drain, it is enough to drain water from 1m² of the roof. Based on this, a pipe with a diameter of 10 cm is able to drain water from a roof area of about 53 meters.
What is the best material to use for making gutters and downspouts?
The most common materials are aluminum and vinyl. But you can use steel and copper gutters. In this case, the determining factor may be the price of the product.
Installing copper gutters will be expensive, but with proper maintenance, these gutters will last for decades. If you live in an area with small temperature fluctuations, then vinyl gutters are a rational choice.
Seamless gutters or not? Seamless gutters and gutters, according to experts, are the best option. These gutters are made to specific dimensions. This option of gutters will cost more to the owner of the house. Prefabricated gutters leak and sag over time. With any choice, the installation of gutters is desirable to be carried out by a specialist in this field of construction.
Laying of engineering communications
Construction of any object, whether residential apartment house or manufacturing facility, can not do without the arrangement of communications that supply heat, water and gas to the building.
Considering the complexity and scope of this type of work, it would be expedient and beneficial to contact specialists who offer services in the field of laying and connecting engineering communications of all kinds.
The use of carefully selected materials and modern designs technology allows you to complete the work in the shortest possible time, guarantee its quality and offer customers optimal level prices for the services offered.
Trench or trenchless method
Depending on the purpose of the object and the characteristics of the soil, work on the arrangement of communications can be carried out in a trench or trenchless way. 
The first is considered traditional - it requires time and the use of excavation equipment, as well as the need to prepare a place for the temporary placement of soil removed from the ground, which will be replaced by pipes and their finishes.
In turn, the trenchless method is modern, developed due to the need to arrange communications in difficult to pass places underground, when the task is to keep transport routes and buildings on its surface. The main methods of trenchless arrangement of communications are horizontal or oblique drilling, soil punching, puncture, carried out using special machinery and equipment that guarantees the integrity of the soil layer and the safety of objects.
Each type of communication requires compliance special measures, in the process of developing pits and digging trenches.
So, water networks differ in branching and the need to arrange frequent wiring to nearby objects. Their arrangement requires, first of all, compliance with the conditions for the preservation of conductive properties and protection from negative external influences, as well as economical operation and the possibility of maintenance and periodic monitoring.
In order to economically and quickly perform all types of work, construction and housing and communal services organizations rent construction equipment and technique.
In turn, heating networks are distinguished by a significant size of the pipe diameter.
Their design requires care and attention, as well as the selection of materials, on the one hand, resistant to prolonged thermal effects, on the other hand, capable of withstanding a decrease in temperature in the soil in winter period, and thirdly, to ensure the safety of the temperature of the coolant.
Therefore, the design of works on the arrangement of heating systems is entrusted to experienced specialists who guarantee compliance with all necessary conditions.
GOST 30245-2003 regulates the basic requirements for the manufacture of closed welded profiles for building structures. The range of steel square pipes includes the main dimensions:
- For a square profile: from 40x40x2 to 300x300x14 mm.
- For a rectangular profile: from 50x25x2 to 400x200x14 mm.
During the pipe development stage, round profiles with longitudinal seams are used, which are pressed with rolls to obtain a square or rectangular profile. Works are carried out on special mills. Steel is taken as the basis:
- Sheet metal roll.
- Carbon steel for general use.
- Low-alloy thick-walled steel (from 3 mm or more), according to TU 14105509.
The removal of burrs from longitudinal seams is carried out with outer side design, the following deviations are allowed:
- 0.5 mm - with a section of profile walls up to 0.4 cm.
- 1 mm - with a metal cross section of 0.4 cm.
The quality of finished products is regulated by the main provisions of the assortment:
3 Assortment
3.1 The main parameters of the profile section are shown in fig. one.
3.2 Other indicators (S sec., axle and weight parameters for 1 m profile element) are determined by the corresponding indicators: for pipes with equilateral walls - Table. one; for rectangular products - table. 2.
3.3 Tolerances for material thickness are in accordance with limit deviations initial blanks with a width of 125 cm of standard accuracy of rolled products "B" in accordance with GOST 199-03. Deviations are allowed in the bend areas.
3.4 The discrepancy between the height and width of products is calculated in%:
- With dimensions (in height and width) up to 10 cm - ± 1, but not less than ± 0.5 mm;
- Over 10 cm - ± 0.8.
3.5 Deviations of the radii of the outer circle are allowed:
- If t
- If 0.6
- If t > 1 cm - from 2.401 t to 3.601 t.
3.6 Maximum size tolerance to the 90° angle is ±1°30" (in the transverse part of the structure).
3.7 The length of profile pipes is 600 - 1200 cm, and at the request of the customer 400 - 1300 cm:
- Unmeasured quantities.
- Dimensional parameters.
- Multiple measured sizes.
3.8 Maximum tolerances to the length of measured and multiple measured values \u200b\u200bis equal to +6 cm.
3.9 Below are the conventional values of bent electrowelded profile structures with vertical parameters = 18, horizontal section = 10, wall thickness = 0.5 cm. In this example, steel grade C245 according to GOST 277-72 is used:
Tab. one
Tab.
Profile pipe - variety steel pipes. This category of products includes a wide range of long products. It is in high demand among construction, manufacturing, agricultural and engineering enterprises. How do these products differ and how to choose the right product from the assortment of profile pipes? These are the kinds of questions that buyers have been asking themselves. Experts will help you understand the intricacies of the purchase major manufacturers high-quality rolled metal.
What is a profile pipe
A profile pipe is a type of high-quality hollow metal. The profile of this pipe is characterized by several but different from round. Thus, the options are:
- square;
- rectangular;
- oval;
- flat oval;
- arched.
Distribution reached pipes with a square and rectangular profile, which is explained by the correct cross-sectional shape.
Assortment of profile pipes
Speaking of assortment (this term comes from the concept of variety), they mean a list of varieties of products of this type, which is offered on the goods market. So, the range of profile pipes includes metal products, general characteristic which are hollow construction and non-circular section. However, these products also have differences:
- section shape;
- material of manufacture;
- production technology;
- profile size;
- wall thickness.
Profile form
This parameter is considered fundamental, since the assortment of products with different sectional shapes (profiles) is indicated separately.
Form types:
- Rectangular pipe. This type of rolled metal has 4 stiffening ribs, which makes it tear and deflection resistant. Equally important is the low weight, which is achieved due to the hollow structure. In addition to the benefits of products, it is worth mentioning convenient storage and ease of transportation.
- Square pipe. This product combines these advantages rectangular pipe while having a compact size. It is impossible to do without a range of profile square pipes in cases of severely limited space.
- Oval, flat-oval, arched. These options are often used when special requirements object side. Polygonal and special profiles. Profile pipes with a polygonal cut or additional recesses are also sold, but they are made to order.
Receiving technologies
All types of profile pipes, regardless of the shape of the profile, are produced using similar technologies.
There are 3 in total.
- Cold rolled. According to cold-rolled technology, ordinary round pipes of a suitable diameter are the starting material for the production of profile pipes. The process boils down to rolling round pipe on special machines. As a result, the product is given desired shape.
- Hot-formed. This manufacturing technology is similar to cold rolled in that a round pipe is used as the starting material. However, there are also differences - before rolling, the pipe is heated to high temperature. Due to this, high internal stress does not arise in the metal and special characteristics are given to finished products. performance characteristics.
- Welded. Production by the welded method involves the use of not a round pipe, but pieces sheet metal. They are run in to give the desired profile, and then the edges are connected by welding.
GOST requirements for the assortment of profile pipes
Pipes with a profile other than round are considered one of the most important segments of all rolled metal products. They are widely used in construction and other important facilities, so they must be manufactured to meet stringent requirements. According to GOST 30245-2003, the assortment of shaped pipes is characterized as bent closed welded products with a profile in the form of a rectangle or square.
However, this GOST is far from the only regulatory document. For each type of profile pipe, additional requirements are provided.
Manufacturing materials
Another distinctive feature assortment of profile pipes is called material. The most commonly used steel. She may be:
- low-alloyed;
- carbonaceous;
- stainless.
Each is assigned a nomenclatural name. It certainly indicates the grade of steel, each of which belongs to a particular group. This characteristic greatly affects the strength, flexibility, durability and other indicators. finished product(including cost). Less common are pipes made of other materials, such as aluminum.
Square pipes: varieties
With a square profile, they differ depending on the production technology. The range of profile pipes of cold deformation includes products with a cross section of 10-120 mm. The wall thickness can reach 1-8 mm.
Hot deformation products are produced with a section of 30-140 mm, the thickness can be 4-14 mm. Electrowelded profile pipes have a thickness of 1-5 mm, and a section size of 10-100 mm.
Rectangular section
Pipes with a rectangular cross section differ in side sizes and wall thicknesses.
Pipes 15 * 10 mm are considered the smallest in size, and 230 * 100 mm are considered the largest. The wall thickness varies from 1 to 14 mm. The larger the section, the greater the wall thickness should be. This allows the pipes to withstand increased loads and serve for many years.
Advantages
The assortment of shaped steel pipes has several advantages that allow them to be used in the construction and industrial sectors:
- Among all high-quality rolled metal, profile pipes have the lowest metal consumption, which significantly reduces the weight and cost of the finished structure.
- Such products are easy to bend, cut and weld, which reduces the speed of installation of products.
- Taking into account sanitary and hygienic standards in production makes them easy to maintain.
- Made of steel, pipes have complete fire safety.
The buyer chooses a product based on the main requirements of the project being implemented, the scope and features of operation. In other words, there is no one ideal solution for two projects that are completely different in direction, cost and application features.
Having considered the characteristics and differences of profile pipes, we conclude: this type of rolled metal is diverse and is extremely useful in many areas of industry. However, those products that were manufactured in accordance with accepted requirements and standards will be durable and wear-resistant. For this reason, before buying rolled metal, you should familiarize yourself with the supporting documents.
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