Nowadays, the steel profile pipe has become widespread. support parts, make frames for public transport stops, railings, benches and much more. The most demanded field of application of steel professional pipes is reflected in the construction industry for the installation of metal structures and the construction of buildings.

The wide choice of types of steel pipes makes it possible to make a suitable design for the required tasks.

The steel pipe has a cross section with 4 stiffening ribs. Despite the fact that such a product weighs very little, it can withstand very large loads.

Their application

The use of shaped steel pipes is wide in scope. Undoubtedly, the most basic area of ​​use of shaped tube-rolling materials is construction. In modern building structures, this type of pipe-rolling assortment is used everywhere.

Their use has the following advantages:

1. Metal is saved by almost a quarter when compared with the construction of a metal building using an I-beam.
2. Easy installation and little time spent on the construction of the frame and structure.
3. Such metal structure more resistant to the formation of corrosive manifestations when compared with other options for pipe rolling. Cold-bent professional pipes successfully replace two-T-beams, corners and channel bars.

Specifications

Consider the main specifications shaped steel pipe:

• Profile view. Its main types are square, rectangular and oval. This criterion determines the division of the pipe-rolling profile in the general assortment.
• Geometric dimensions. For rectangular views, these are the width and height. And also the length of each segment.
• Wall thickness. Quite a significant detail, because it is it that determines the scope of further use.
• Weight. No less significant assessment that determines the quality level of goods. By means of weight and geometric dimensions, you can find out the thickness of the walls. This becomes very useful in situations where measurements are not available.

Describing steel professional pipes, it should be noted that their assortment is determined by GOST 8639-82. In the specified document, there are three main types of profile:

• Cold-formed.
• Hot rolled.
• Electrowelded.

The first two refer to seamless, and the third is produced from sheet material using welded technologies.

It should be noted that any characteristic of a pipe is dependent on a number of its other indicators. For these reasons, we can conclude that the presence of a table of the corresponding calculated GOST values ​​makes it easy to find out how much high level quality from this or that manufacturer.

The weight

Table No. 1 of the weight of steel pipes.

P / p No.	Options. Profile square pipes	Length	Weight meter / running
1	15x15x1.0		0, 478
2	15x15x1.2		0,500
3	15x15x1.5		0,600
4	20x20x1.2		0,680
5	20x20x1.5		0,840
6	20x20x2		1,09
7	25x25x1.2		0,870
8	25x25x1.5		1,06
9	25x25x2		1,38
10	30x30x1.5		1,30
11	30x30x1.5		1,60
12	40x40x1.5		1,79
13	40x40x2		2,30
14	40x40x2.5		3,33
15	40x40x3		4,20
16	40x40x4		3,60
17	50x50x2.5		3,65
18	60x60x2		3,58
19	80x80x3	12 m	7,12
20	100x100x3	12 m	9,01

The weight of the pipe will depend on its length and wall thickness. This moment must be taken into account when choosing them.

Video:
the types and types of shaped pipes and their technical characteristics are presented. Watching this video will help you decide on the choice of professional pipes specifically for your situation.
The weight must be taken into account when constructing massive metal structures, if this is your case, then use our tables.

Table No. 2 weights of steel shaped pipes.

P / p No.	Options Profiled rectangular	Length	Weight meter / running
1	20x10x1.2		0, 500
2	25x10x1.5		0,600
3	28x25x1.2		0,930
4	30x15x1.5		0,950
5	40x20x1.5		1,30
6	50x25x2		1,66
7	60x30x2		2,64
8	80x40x2		3,50
9	100x50x3	12 m	6,50
10	100x50x4	12 m	8,69
11	120x60x3	12 m	11,40
12	120x60x4	12 m	10,55
13	140x60x2	12 m	11,80
14	140x60x5	12 m	14,58
15	150x100x5	12 m	18,4
16	160x80x5	12 m	17.69
17	160x120x5	12 m	20,80
18	180x100x6	12 m	24.69
19	200x120x5	12 m	23.98
20	230x160x6	12 m	46,11

Range of these products

In addition to these parameters, the classification can be made by following points:

1. Steel marking.
2. Absence / presence of finishing heat treatment.

The length parameters in this situation are determined by GOST 13663-86. This standard determines that steel professional pipes different shapes produced in standard measured lengths, their length is from 1 to 12 meters.

GOST 8642-68 determines the size of the cross-section of the professional pipes, respectively, these products were divided into 36 different types sizes with a cross-section in the range of 0.6 by 0.3 cm, and 0.9 by 3.2 cm.

By the type of profile, they were divided into:

• Oval steel options.
• Products with a rectangular section.
• With a square section.

Video

Depending on the scope of application, these pipes are classified into:

• Profiled pipes for furniture. The construction of them, as a rule, does not bear heavy loads.
• Flat - oval types. Their other name is a profile for an arch. It is more complex to manufacture.
• General purpose options. They are made from hot-rolled one and a half millimeter tape. Such products do not have high requirements for surface quality.
• Construction. For their production, they take hot-rolled and low-alloy steel, which is distinguished by increased strength indicators.

Square profile

Steel square tube is widely used in construction area.

It is the shape of the square in this situation that is the main advantage. It provides high stability and quick installation work.

These materials act as a reinforcing element in the construction of structures for supports and frames. They can be found not only in construction. They are used no less often in the mechanical engineering sector.

Square pipes are divided into the following types:

1. seamless cold deformation or cold rolled.
2. seamless hot deformation or hot rolled.
3. profiled products obtained from sheet material and by means of welded technologies.

The assortment of such goods consists of products with a wall thickness of 0.1 to 1.4 cm and a length of six to twelve meters. Craftsmen call this type of product a guarantee of compliance with the financial costs of construction with their minimization.

Rectangular profile

Profile rectangular pipe is a type of pipe-rolling materials rectangular... This is a kind of subspecies square options... It is also a hollow metal profile with a variety of volume and wall thicknesses.

They are used when assembling structures and building elements on which a load-bearing role lies. They are taken for furniture frames, scaffolding for construction, children's areas and much more.

The peculiarities of the shapes and the small weight of the products significantly reduce the mass of the main structure, but the resistance to the influence of high load influences in this situation increases. They are often used as a protection channel for wiring a network of cables.

The main differences are determined by GOST 8645-78. According to these standards, there are such rectangular pipes:

• with unmeasured length;
• with measured length;
• assortment with short measured length.

Depending on the type, the length of seamless or welded materials varies from 11.5 to 12.5 meters:

• Seamless professional pipes of unmeasured and measured length, made by hot-rolled method - from 4 to 12.5 m.
• Seamless pipes of unmeasured length, made by cold-drawn method - from 1.5 to 12.5 m, and measured - from 4.5 to 11 meters.
• Pipes of unmeasured length, made by the electric-welded method - from 1.5 to 9 m, measured length - from 5 to 9 m.

When working with such profile products, allowances of 0.5 cm are made for every part.The maximum excess of the length level as a whole is 10 cm.

Electrofusion profile

Steel electrowelded shaped pipe is produced according to different technological methods. The first of these is the formation of a profile from a flat blank. At the same time, simple equipment is used, which is distinguished by low energy consumption. However, the resulting products have some disadvantages:

1. uneven distribution of stresses in the cross-section.
2. significant thinning of the profile workpiece in the corner places.

In this case, advanced technologies, which imply an even distribution of voltage at the initial stage, allow to change the negative characteristics. In this case, a round billet with the required volume is formed.

Secondary processing in this case provides for the formation of a cross-section of the required dimensions and shape by means of the pressure of special rolls.

Galvanized steel profile

Galvanized profile pipes are a special type of rolled metal. The galvanized profile has increased anti-corrosion properties, which prolongs its service life.

Video

The advantageous difference between a galvanized product is:

• The speed of installation work and their convenience.
• Increased strength.
• Fracture resistance.
• Reducing the total weight of the structure without losing its strength capabilities.
• Logistic convenience.

Their spheres are very different, and the main ones among them are:

• Construction of various scales.
• Mechanical engineering.
• Construction of quickly assembled structures.

At the moment, this type of rolled metal can be found in billboards, fences, in retail premises. And everywhere these steel pipes fully meet all regulatory requirements.

Manufacturing features

The production of shaped pipes is more complicated and more costly than the production of round rolled pipes.

Technological methods for the release of professional pipes are:

• Pressing of round billets produced on rolling mills. This option is expensive, therefore, the second type is more popular.
• Welded connection strip profiles.

The first method is remarkable in that it makes it possible to preserve the strength characteristics of steel pipes one hundred percent. The fact is that its connections are seamless. The sequence of production by this method is as follows:

• First, a regular hot-rolled billet with a round shape is produced.
• Through the press, it turns into an oval, takes the shape of a square or rectangle.
• Calibration of heated blanks is performed on the rollers of the rolling equipment, so the products acquire the required dimensions.

Profiled pipes, for the manufacture of which they used welding, are not very distinguishable from seamless analogs, but at the same time they lose up to 5 percent of their strength. The release sequence in this case is as follows:

1. Steel sheet blanks are cut into strips.
2. After that, such strips are rolled up into a tape.
3. It is fed into the rollers of the molding machines, which carry out deformation. flat sheets in vocational training.
4. The fastening seam is welded in special chambers filled with an inert medium.

Video

The main advantage of the professional pipe is its low cost and high strength... It will not be difficult to buy this steel product. The managers of any company will provide all the information about their cost and characteristics.

The steel profile pipe is successfully used in the construction of premises for trade, warehouses, sports facilities, buildings for housing and production. These products are used as supports, columns, and various elements of all kinds of structures.

Their high strength makes them very popular for the creation of metal structures that stand out for their particular complexity. On construction market these products are deservedly highly popular.

Recordings

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 square profile: from 40x40x2 to 300x300x14 mm.
• For a rectangular profile: from 50x25x2 to 400x200x14 mm.

During the pipe development phase, circular profiles with longitudinal seams are used, which are crimped with rolls to obtain a square or rectangular profile. The work is carried out on special mills. Steel is taken as a basis:

• Coiled sheet metal.
• All-purpose carbon steel.
• Low-alloy thick-walled steel (3mm and more), according to TU 14105509.

Burr removal from longitudinal seams is carried out from the outside of the structure, the following deviations are allowed:

• 0.5 mm - when the profile walls are sectioned up to 0.4 cm.
• 1 mm - with a metal section of 0.4 cm.

The quality of finished products is regulated by the main provisions of the assortment:

3 Range

3.1 The main parameters of the profile section are shown in Fig. 1.

3.2 Other indicators (S section, axis parameters and weights for 1 m of a profile element) are determined by the corresponding indicators: for pipes with equilateral walls - table. 1; for rectangular products - tab. 2.

3.3 The permissible errors in the thickness of the material correspond to the maximum deviations of the original blanks with a width of 125 cm of the standard accuracy of rolled "B" according to GOST 199-03. Deviations are allowed in the fold areas.

3.4 The discrepancy between the height and width of products is calculated in%:

• For sizes (height and width) up to 10 cm - ± 1, but not less than ± 0.5 mm;
• Over 10 cm - ± 0.8.

3.5 Allowed deviations of the radii of the outer circle:

• If t
• If 0.6
• If t> 1 cm - from 2.401 t to 3.601 t.

3.6 The maximum size of the tolerances for the 90 ° angle is ± 1 ° 30 "(in the transverse part of the structure).

3.7 Length of profile pipes 600 - 1200 cm, and at the request of the customer 400 - 1300 cm:

1. Unmeasured quantities.
2. Dimensional parameters.
3. Multiple dimensional sizes.

3.8 The maximum tolerances to the length of measured and multiples of measured values ​​are +6 cm.

3.9 Below are the conventional values ​​of bent electric-welded profile structures with vertical parameters = 18, horizontal section = 10, wall thickness = 0.5 cm. In this example, steel grade C245 is used in accordance with GOST 277-72:

Tab. 1

Tab.

In construction, automotive and other industries, not only round pipes are needed, but also rectangular steel pipes as well as rectangular steel pipes. These shaped products can withstand higher loads than usual. round elements, and this is safety and long-term operation building structure.

The shaped rectangular pipe has also proven itself well in the production of consumer goods - in the manufacture of furniture and other frame products, in the construction of fences and enclosures, greenhouses and pavilions. The demanded standard sizes of pipes of standard rectangular and square cross-section according to GOST 8645-68 are as follows:

Section of square pipes:

1. Sectional section: 10 x 10 mm / 180 x 180 mm;
2. Wall thickness: 0.8 / 14.0 mm;
3. Weight of one running meter: 0.22 kg / 70.3 kg;
4. Standardization according to: GOST 8639-82;

Rectangular section products:

1. Sectional section: 15 x 10 mm to 180 x 150 mm;
2. Wall thickness: 0.8mm / 12.0mm;
3. Weight of one running meter: 0.348 kg / 55.71 kg;
4. Standardization according to: GOST 8645-68;
5. Technical requirements according to: GOST 13663-86.

Production of rectangular shaped products

The metallurgical industry has mastered the production of such rolled metal:

1. Steel pipes of rectangular cross-section for the construction of load-bearing structures. Rectangular iron pipes look more aesthetically pleasing, although I-beams would be preferable in terms of strength;
2. For lightweight structures with low weight, working in conditions of importance of design and appearance, make seamless rectangular stainless steel pipes, the surface of which is pre-grinded and polished;

Products of tubular metal products in the shape of a rectangle or square are used only for the construction of any metal structures: they are used very rarely for laying pipelines for the following reasons:

1. Any steel rectangular pipe has a smaller internal volume than a round product, which means that less liquid or gas passes in 1 running meter of such a product in 1 hour than in a conventional circular line. Thus, the productivity of pumping the working medium through steel pipes of square or rectangular cross-section is much lower;
2. Rectangular metal tube holds well tensile, twisting and bending stress, but internal loads it takes much worse. That is, at a high internal pressure of the working medium, a steel pipe of a square or rectangular profile may crack or even rupture;
3. Round pipes weigh less than rectangular products, which means that the total weight of a square line will be greater;

The standardized dimensions of the profile pipe affect the scope of their application:

1. The dimensions of the profile pipe 60 x 30 mm mean that these are products with low metal consumption, and they can be used to save construction;
2. Sizes of profiled square or rectangular metal pipes 15 x 15 mm, 40 x 60 mm, 60 x 60 and 100 x 100 mm are used in the assembly of structures of all sizes and complexity;
3. The dimensions of the profile pipes 25 x 25 mm are also lightweight, due to not large sizes have high strength and degree of tightness, they can be easily and quickly assembled into any forms of metal structures.

Additional areas of application for square steel and welded rectangular pipes:

1. The dimensions of the professional pipe 25 x 250 mm are used in a narrow profile - in mechanical engineering in the manufacture of frames and frames;
2. A profile pipe with a cross section of 60 x 30 mm is used in the assembly of advertising boards, frames and panel structures of various complexity and configuration;
3. Tube-rolling profiled products of other cross-sections (for example, 40 x 40 mm or other dimensional range, etc.) are used to assemble almost any building structures, even such as chimneys or ventilation ducts, internal and external, as well as when installing capital or lightweight construction projects: storage facilities, hangars, sheds.

The standard assortment of rectangular and square products is so in demand in construction that it is difficult to imagine the construction of even a small object without them - these are ideal welded or seamless products in the construction of metal structures of any complexity, the area and height of which does not matter due to the high load capacity of this type of rolled metal.

Reference table of dimensions and description of other parameters of tubular products of rectangular, oval and square cross-section:

Advantages and features of rectangular metal structures and elements for them:

1. Specific gravity of rectangular elements different diameters always less than this parameter of a solid rectangular bar with the same cross-section. With the largest geometric dimensions of rectangular pipes 230 x 100 mm, such elements weigh only 37-38 kg, while the mass of a solid beam with the same dimensions will be about 1000 kg. Therefore, even the largest thickness of such profile elements does not detract from their advantages over solid channels, I-beams or beams;
2. It is much easier and faster to cut or weld pipes compared to solid elements. In addition, a rectangular steel pipe, the assortment of which is reflected in a small table, is easily deformed into a curved product using a conventional pipe bender, while a hydraulic forging press is needed to bend an all-metal product;
3. The cost price of rectangular and square pipes without seam is less.

Varieties of rectangular pipes

The range of sizes, taking into account the length and thickness of the walls of shaped rectangular pipes, is so extensive that when choosing a product for certain operating conditions, it is recommended to take into account the manufacturing technology of the product, which determines the scope of the product.

The assortment serves as the basis for the classification of profile elements. Taking into account the technology of manufacturing pipes, the assortment of these shaped elements in the construction market is divided into the following categories:

1. Hot-deformed seamless products that are produced using hot-rolled technology;
2. Cold-deformed seamless products that are produced using cold rolling technology;
3. Welded elements that are produced using electric welding.

The rest of the technologies for rolling and other methods of manufacturing metal shaped pipes are not efficient enough and pay off.

GOST and assortment of pipes made of black steel and stainless steel

The standards used in modern industry regarding the production and assortment of profile and other metal products were approved in the last century, but they are still applied, since their requirements have not lost their relevance: these are GOST 8639-82, GOST 13663-86, GOST 8645 -68 and GOST 13663-86. And, although the requirements for cold and hot rolled products provide sufficient strength and durability of products, elements of rolled products are less in demand than welded ones, due to the fact that welding can more easily change the direction of the line and the bend of individual sections of the structure. Therefore, when choosing the required number of profile products, it is recommended that you first familiarize yourself with the geometric dimensions and manufacturing technology of certain profile parts.

The technologies for the manufacture of any stainless steel profile elements are fundamentally no different from the methods for the production of pipes from black steel, which is more susceptible to metal corrosion, except for a separate item - cost. Due to the high cost of production, stainless steel shaped parts are practically not in demand in the construction of large and heavy objects with high bearing loads, and therefore the strength requirements for rectangular stainless steel pipes are underestimated in comparison with the same requirements for ordinary steel.

Therefore, most often rectangular stainless shaped products are made by welding using the HF technology, which is based on the effect of induction currents on metals, and is a relatively cheap technology.

There are no separate standards and norms for the assortment of stainless rectangular or square pipes, therefore, in their manufacture, they use GOST for parts made of black (corrosion-resistant) steel, and standards for raw materials:

1. GOST 11068-81 is used for the production of stainless shaped products by the method of electric welding;
2. For the manufacture of elements of hot-formed seamless products, GOST 9940-81 is used;
3. For the manufacture of elements of cold-formed seamless products, GOST 9941-81 is used.

At the disposal construction organizations there is a special table for the assortment of rectangular and square pipe products made of steel, but since stainless steel has a higher density than black corrosion-resistant steel, its specific gravity for 1 running meter it will be slightly more, and for each series of products, manufacturing companies have their own assortment of products of their own production.

When ordering and buying profile products made not by a large company, but by a semi-handicraft method and by an unknown manufacturer, take a responsible attitude to the fact that such products are dangerous to use for the construction of any supporting structures of large dimensions and weight. The danger is that such products are rarely processed in a heat chamber after rolling, and there are internal stresses in the products that affect the strength of the product, especially under severe operating conditions.

Where are rectangular tubing elements used?

A wide range of sizes of profile elements of square and rectangular cross-section - this is the possibility of their use in almost all industries National economy including private construction.

In addition, the assortment allows the production of the following assemblies, elements and structural details:

1. Large-sized frameworks of load-bearing structures with a large profile wall thickness, for example, 196 x 170 mm. Such products ideally provide strength and resistance to any type of load of objects: hangars, warehouses, shopping centers, hypermarkets, sports complexes, skeletons high-rise buildings, etc;
2. Decorative fences and security fences. Such structures are made most often from profile stainless steel, have a small size and a prefabricated structure. Stainless steel for decorations is better suited than black steel fences that rust over time;
3. Furniture and its components: metal chairs and tables for public offices, student desks, furniture for medical institutions, public organizations and social institutions;
4. Frameworks for winter garden, small greenhouses and greenhouses. On lightweight steel profile frame you can quickly stretch the film or glaze.

Profile metal products are an indispensable unit for any construction site and general-purpose metal structures. Such profiles are widely used in individual construction, subject to low loading of thin-walled frames.

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Assortment concept

What is “assortment”? 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 shaped pipes, then the assortment of these products includes all types of products that are manufactured in factories or are located in suppliers' warehouses.

It is convenient to present the assortment of shaped 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 parts presented in the table. In addition, it may indicate the grade of steel, the size of the profile, the wall thickness of the products, the yield point, the method of manufacture, and other characteristics, having become familiar with which we have a complete understanding of the product.

GOST 13663 86

This State Standard presents shaped pipes made of steel, both seamless and welded for general use. 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.

Items can be:

• with the presence of hollow ribs;
• flat oval forms;
• oval and drop-shaped sections;
• square ();
• rectangular ().

The assortment foresees the presence of 2 groups of shaped pipes according to GOST:

• group A products: the mechanical properties of steel are standardized;
• products of group B: availability is standardized chemical elements in a specific proportion, the mechanical characteristics of the base metal.

The index of the product group when marking it - A or B, is affixed in front of the steel grades.

The assortment foresees the presence of steel shaped pipes with and without heat treatment.

Non-specialists in this industry sometimes talk about the assortment of steel shaped pipes GOST 13633 86. It turns out that such a Standard does not exist at all, and the numbers, probably, are simply confused 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:

• seamless method (hot and cold deformation);
• by welded method (electric welding with hot and cold calibration, furnace welding).

As GOST 8645 68 in practice, they use square analogs of GOST 8639 82, the range of which is also quite large.

The shape of the rectangular elements should be the same as in the drawing.

In table 1 it is possible and some parameters rectangular products general purpose.

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

The uprights are manufactured in a close relationship between linear parameters and wall thickness. Thanks to the stiffening ribs, the construction of rectangular parts is distinguished by its strength, reliability, long service life and other positive properties.

Rectangular uprights are used in:

• construction industry. With their help, bearing structures for sports and cultural facilities, offices and other premises. Perfect railings, various decorative fences are obtained from rectangular parts;
• mechanical engineering. Modern tractors, agricultural machinery, heavy vehicles, trailers are mounted on frames made of hollow rectangular struts. Low weight combined with high strength is the main condition for creating reliable metal structures;
• agriculture. The erected greenhouses, greenhouses, sheds for seeds, equipment, and other structures can easily withstand serious both lateral and longitudinal loads;
• furniture industry. There are such risers in every school desk, in every chair. They are used to supply furniture for medical and public institutions. Together with wooden elements they look very aesthetically pleasing.

You cannot do without them when erecting frames. trade pavilions, awnings, temporary and permanent advertising structures.

With their help, devices are mounted that facilitate the performance of work inside and outside the premises.

Effective interaction with planes helps to expand product applications. Due to the rectangularity of structural parts, the range of functional purpose of the final product is significantly expanded.

Despite the savings in metal during production, rectangular risers are a fairly high-quality, in-demand product. Rectangular parts are available to consumers due to the competitive cost of the product and high quality.

GOST 8639 82

This Standard refers to the assortment of a square shaped pipe, for the manufacture of which are used:

• seamless method (hot and cold deformed elements);
• electro-welded (cold-deformed, hot-calibrated parts).

The document applies to the assortment of shaped pipes GOST 8639 82 square section, for the production of which they also used furnace welding.

Depending on the manufacturing method, purpose, steel grades, parts can be different lengths with different wall thicknesses, different sections and external dimensions (Table 2):

table 2

The maximum error along the total length is no more than +100 mm.

The drawing indicates the shape, and the table. 3 for dimensions and other parameters of shaped square pipes GOST 8639 82.

Table 3

External 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

Range of square shaped pipes 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 for 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 shaped pipes that meet GOST.

The production of an extensive assortment of profile square risers as a variety of rectangular products is carried out accordingly. Elements can be measured, unmeasured. If necessary, you can purchase parts that are multiples of dimensional.

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 length - 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 can be found more often than others in hardware stores);
• when cutting dimensional parts, you must adhere to marginal deviations 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 range from 50 mm to 300 mm. The assortment of the goods foresees 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. The parts produced must comply with Specifications a state supervisory authority that assesses their safety level. The marking of the parts contains the designation TU.

The shape of the parts is shown in the drawing.


With individual parameters of some product sizes
can be found in table. 4.

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 structure of a square riser is a closed profile, for the formation of which a metal strip is used. The quality characteristics that appear during the operation of products depend on the design features, material of manufacture.

Such products are different:

• increased resistance to bending and torsion;
• durability;
• reliability;
• small mass;
• long service life.

Today it is difficult to imagine human activity without square risers. They found wide application in different areas.

Profiles are the basis of modern industrial and domestic construction. When reconstructing old building objects and constructing new ones, square-section details are used to create roof frames, floors.

Functioning cannot be imagined 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.

In comparison with analogs of circular cross-section, square and rectangular profiles bend after high loads. Moreover, after the termination of the load, the riser takes its original position. This is their strength and reliability.

Round products, with a similar effect, can not only deform, but also completely collapse.

Production stages

The range of square steel shaped pipes GOST 30245 2003 provides for the use of sheet steel grades from carbon and low-alloy groups with sheet thicknesses of 3 mm, 4 mm and more. Individual orders are made using high quality steel grades.

After determining the manufacturing method, product sections, production begins, which foresees several stages:

1. Unwinding, cutting of rolled sheet metal into strips of a certain width.
2. Formation of a long strip from cut strips by welding.
3. Feeding the tape, forming products with a square section from it on a forming machine.
4. Welding the connecting longitudinal seam formed as a result of bending the workpiece.
5. Removing to a minimum (the remainder is not more than 0.5 mm - 1 mm) of the burr from the welded seam.
6. Conducting quality control measures welds... If deficiencies are found, they are removed.
7. Cutting quality pieces of the required length.
8. Packaging of finished items.

The finished packaged products are sent to the warehouse for storage.

Video

Drains. 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 home, or a tribute to fashion. Drains 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

A properly functioning gutter system protects the roof, roofing, walls of the house, basement of the building and foundations from premature wear. Not to mention the aesthetic component of the benefits of gutters.

They save you from mud at home, puddles at the basement and accidental falls. Consider the simplest questions about what the drainage system of a residential building should be. What size downpipes should be? 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 ​​that part of the roof for which the drain is calculated.


In temperate climates, the calculation takes into account that with a 1.5 cm² cross-section, there is enough drainage to drain water from 1 m² of the roof. Based on this, a pipe 10 cm in diameter is capable of draining water from a section of the roof with an area of ​​about 53 meters.

What is the best material to use for making gutters and gutters?

The most common materials are aluminum and vinyl. But you can use steel and copper gutters. In this case, the price of the product may be the determining factor.

Copper gutters are expensive to install, but with proper maintenance, these gutters will last for decades. If you live in an area with small temperature variations, vinyl gutters are a smart choice.

Seamless gutters or not? Seamless gutters and gutters are, according to experts, the best option. These gutters are made to measure. This option of gutters will cost more to the owner of the house. Collecting gutters leak and bend over time. With any choice, the installation of gutters should preferably be carried out by a specialist in this field of construction.

Laying of engineering communications

Construction of any object, be it residential apartment house or a production workshop, is not complete without the arrangement of communications that supply heat, water and gas to the building.

Given the complexity and volume of this type of work, it will be expedient and profitable to contact specialists who offer services in the field of laying and connecting all types of engineering communications.

The use of carefully selected materials and modern samples of technology allows you to complete the work in the shortest possible time, guarantee its quality and offer customers the optimal level of 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 by a trench or trenchless method.

The first is considered traditional - it takes time and the use of excavating equipment, as well as the need to prepare a place for temporary placement of soil removed from the ground, which will be replaced by pipes and their finishing.

In turn, the trenchless method is modern, developed due to the need to equip communications in difficult-to-pass places underground, when the task is to preserve transport routes and buildings on its surface. The main methods of trenchless arrangement of communications are horizontal or oblique drilling, pushing the soil, puncture, carried out using special equipment and equipment that guarantees the integrity of the soil layer and the safety of objects.

Each of the types of communications requires adherence to special measures in the process of developing pits and digging trenches.

So, water supply networks are characterized by ramification 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.

To economically and quickly perform all types of work, construction and housing and communal services organizations are rented construction equipment and technique.

In turn, heating network differ in 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 heat exposure, on the other hand, capable of withstanding a drop in soil temperature in winter, and on the third, to ensure the preservation of the temperature of the coolant.

Therefore, the design of work on the arrangement of heating networks is trusted by experienced specialists who guarantee that all the necessary conditions are met.