What is a section of a profile pipe. Profile pipe: assortment. Classification and sizes of profile pipes. GOST and assortment of pipes made of black steel and stainless steel

19.10.2019

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 flash from longitudinal seams is carried out from the outside of the structure, 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., axis and weight parameters for 1 m of the profile element) are determined by the corresponding indicators: for pipes with equilateral walls - table. one; for rectangular products - table. 2.

3.3 Permissible errors in the thickness of the material correspond to the maximum deviations of the initial blanks with a width of 125 cm of the 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 The maximum tolerance for a 90° angle is ±1°30" (in the transverse part of the structure).

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

Unmeasured quantities.
Dimensional parameters.
Multiple measured sizes.

3.8 The maximum tolerances for the length of measured and multiple measured values are +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.

All products are characterized by certain parameters. This also applies to water pipes. In addition, such a type of this product as profile pipes also has its own differences, its own classification, its own specifications, that is, dimensions, cross-sectional area, load capacity, material of manufacture, and so on.

Naturally, profile pipes are regulated by GOSTs during their production, so any deviation from their requirements is considered a marriage.

Some classification

A profile pipe is any other type of pipe other than a standard round pipe. The big advantage of such varieties is that the cross-sectional area, having equal dimensions with round products, will be larger.
Such pipes have excellent technical characteristics, especially when it comes to their strength.
They are used in many areas of life: heavy and light industry, agricultural engineering, furniture production and many other industries.
The classification of these materials can be built on the basis of many characteristics, such as, for example, sizes, shapes, production methods, and so on. Let's look at this issue a little closer.
The following types are distinguished by form:

Square;
oval;
Flat-oval, that is, those in which two sides are straight, and the other two are made in the form of arcs, that is, rounded;
Rectangular.

General GOST for the manufacture of profile products has the designation 13663-86. Depending on the form, they are manufactured according to the following standards:

For square, GOST 8639-82 is applicable;
For rectangular, GOST 8645-68 is applicable;
For a flat-oval shape, GOST 8644-68 is applicable;
For oval, GOST 8642-68 is applicable.

Note! All such products are made of steel various kinds. I must say that each type of steel also has its own GOST.

If we talk about the production method, then the profile pipe will have two types:

Electrowelded;
Seamless.

Electrowelded can have several of its types:

thin-walled;
thick-walled;
Having a galvanized surface and not galvanized;
Straight line and many others.

Seamless has the following types:

Seamless;
Hot rolled;
Galvanized and non-galvanized.

Cold rolled and hot rolled steel

Here, too, a small caveat should be made. We will talk about those types of steel that are used for the manufacture of these products, but it’s worth understanding the difference between cold-rolled and hot-rolled products.
On the initial stage produce sheets by hot rolling. A large original sheet is cut into smaller pieces or into strips. Cold-rolled steel is first processed, that is, the pickling process takes place first. Only then does the cold rolling process start. For this reason, in the absolute majority, cold-rolled steel, or rather a sheet of it, cannot be thicker than 4-5 mm. The area, like other parameters, can take on a wide variety of values, but the thickness has an upper limit. However, the surface of such steel products is much better.
Such sheets have a constant thickness, whatever their area. In addition, they do not have scale. It must be said that the technical characteristics are much higher, since before cold rolling everything steel materials undergo a hardening process. Accordingly, the load on products made from such material may be higher.

Seamless and electrowelded

If we figured out hot and cold rolled products, now it remains only to figure out what seamless products are and what electrically welded products are.

Electrowelded products are obtained by molding and subsequent electric welding. They have seams that can be straight or spiral, hence the name - straight-seam and spiral-seam. These products can be made either from a sheet of low-alloy carbon type steel, or from a billet - strips.
A metal blank (sheet) is welded with its edges along one line. This is how straight-line products are obtained. The spiral variety is obtained by winding the steel tape in a spiral.
Profile pipes of such a plan can be used to create gas pipelines. In this case, the maximum load is 16 MPa.
All such types have their own GOST manufacturing.
All products can be thick-walled or thin-walled. In this matter, the production process has no effect.
Seamless products are obtained by rolling an ingot of steel. During this process, a hole is formed in the center, which is later calibrated in its shape and size.
I must say that seamless products can be manufactured in several ways at once, for example, forging or rolling.
As in the first case, a seamless pipe can be thin-walled or thick-walled. The most important advantage that all seamless products have is their incredible strength, which is achieved due to the absence of a seam - the weakest point. Basically, seamless products are used where it is necessary to constantly deal with high loads, both internal and external. The seamless pipe has gained great popularity in the oil industry, as well as in the field of transportation of highly aggressive media.

Some Specifications

The main ones include:

Profile form. There are rectangular, square and so on;
Dimensions, that is, height and width. Here it must be said that this indicator has its own GOST, however, manufacturers today produce profile pipes with any width and length;
Wall thickness. According to this parameter, it is divided into two types - thin-walled and thick-walled. This is an important parameter, since it determines the scope of application. The wall thickness is regulated according to GOST, but there are exceptions;
Weight. It's not just the convenience of transportation and operation. Weight determines the quality of the product. Knowing the dimensions and mass, you can easily find out how thick its walls are, if this cannot be done by direct measurement.

What does the industry offer?

Today, the assortment offered by manufacturers is very wide. For example, consider products according to GOSTs 30245-94, 8645-68, 8639-82, that is, electric-welded pipes with different section shapes.
Assortment of square products (this includes both seamless and electric welded products):

External parameters from 10 to 10 to 120 to 120. At the same time, both thick-walled and thin-walled ones are produced, the wall thickness is from 1 to 8 mm - this is for cold-formed materials;
External parameters from 60 to 60 to 180 to 180. Wall thickness from 4 to 14 - this is for hot-rolled products;
External parameters from 10 to 10 to 100 to 100. At the same time, both thick-walled and thin-walled ones are produced, wall thickness from 1 to 5 - this is for electric-welded materials.

Here all values are in mm.
Rectangular pipe (this includes both seamless pipe and electric-welded pipe) has the following assortment:

Sizes from 10 by 15 mm with a thickness of 1 to 180 by 150 with a thickness of 12 mm;
Groups A and B. The first includes products made of steel grades St2 (4kp / ps), and the second - St.2 (4 kp / ps), as well as 08 kp and 10-35.

Range of steel products (both thin-walled and thick-walled, GOST 30245-2003):

For square shape- from 4 by 4 cm with a thickness of 2 mm to 30 by 30 with a thickness of 14 mm;
Rectangular has such dimensions - from 5 by 2.5 cm to 40 by 20 cm, and the wall thickness is from 2 to 14 mm, respectively.

As you can see, there are plenty to choose from. And this is only part of the whole range of sizes, shapes and materials.

Wall thickness and other dimensions

In this article, we have mentioned many times such a concept as thin-walled or thick-walled. The whole point is this: for different sizes, the same thickness can be either small or large. Hence the names.
Naturally, thick-walled products will also cost more, since more material has been spent on their production.
The wall thickness can range from 1 to 14 mm.
I must say that depending on the type, the sizes also change:

Cold rolled - wall thickness from 1 to 8, dimensions from 1 to 12 cm;
Hot rolled - wall thickness from 4 to 14 mm, dimensions from 6 to 18 cm;
Electric welding - wall thickness from 1 to 5 mm, dimensions from 1 to 10 cm.

Most of the existing sizes are shown in the table below:

The length of the material also has some dependence on the method of production. This indicator ranges from one and a half meters to 12.5.
There is also a classification by length:

Measured length;
Unmeasured length;
Multiple measured.

For materials with a measured or multiple measured length, it is customary to add a margin of 5 mm. For this reason, the finished product at the exit may turn out to be 10 cm longer than the prescribed one.

In our time, the steel profile pipe has become widespread. supporting parts, make frames for public transport stops, railings, benches and much more. The most demanded field of application of steel corrugated pipes is reflected in the field of construction during the installation of metal structures and the construction of buildings.

A wide choice of types of professional pipes made of steel makes it possible to manufacture a suitable design for the necessary tasks.

The steel corrugated pipe has a cross section with 4 stiffeners. Despite the fact that such a product does not weigh much, it can withstand very large loads.

Their application

Application of profile steel pipes differs in breadth of scope. Undoubtedly, the most basic area of use of profile pipe materials is construction. In modern building structures this type of pipe range is used everywhere.

Their use has the following advantages:

Metal is saved by almost a quarter when compared with the construction of a metal building using an I-beam.
Easy Installation and the small time spent on the construction of the frame and structure.
Such a metal structure is more resistant to the formation of corrosion manifestations when compared with other pipe rolling options. And cold-formed professional pipes successfully replace the two-tee beam, corners and channel.

Specifications

Consider the main technical characteristics of a profile steel pipe:

Profile view. Its main types are square, rectangular and oval. This criterion determines the division of the pipe profile in the general assortment.
geometric dimensions. For rectangular views, these are the width and height. As well as the length of each segment.
Wall thickness. Quite a significant detail, because it is it that determines the scope of further use.
Weight. An equally significant assessment that determines the quality level of goods. Through weight and geometric dimensions, you can find out the wall thickness. This becomes very useful in situations where the ability to access measurements is not available.

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

Cold-formed.
Hot rolled.
Electrowelded.

The first two are 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 values of GOST makes it easy to find out how high the level of quality is from one or another manufacturer.

The weight

Table No. 1 of the weight of steel pipes.

No. p / p	Options. Profile square pipes	Length	Weight meter / rm.
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 point must be taken into account when choosing them.

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

Table No. 2 of the weight of steel profile pipes.

No. p / p	Options Profile rectangular	Length	Weight meter / rm.
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

Assortment of these products

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

Steel marking.
Absence/presence of finishing heat treatment.

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

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

By type of profile they are divided into:

Options in oval steel.
Products with a section rectangular.
With a square section.

Video

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

Profile pipes for furniture. The construction of them, as a rule, does not carry large loads.
Flat - oval types. Their other name is a profile for an arch. It differs in more complex manufacturing.
General purpose options. They are made from hot-rolled 1.5 mm strip. Such products do not impose high requirements on the quality of the surface.
Construction. For their production, they take hot-rolled and low-alloy steel, which is characterized by increased strength indicators.

Square profile

Steel square profile pipe is widely used in the construction field.

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

These materials act as a reinforcing element in the construction of structures of supports and frames. They can be found not only in construction. No less often they are involved in the engineering industry.

Square pipes are divided into the following types:

seamless cold-formed or cold-rolled.
seamless hot deformation or hot rolled.
profile 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. Masters 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 rectangular pipe materials. This is a kind of subspecies of square options. It is also a hollow profile made of metal with various volume sizes and wall thicknesses.

They are used in the assembly of structures and building elements on which the bearing role lies. They are taken for furniture frames, scaffolding for construction, children's areas and much more.

Features of forms and little weight products significantly reduces the mass of the main structure, but the resistance to the influence of high load effects in this situation increases. Often they are 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 a 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 random and measured length, made by hot-rolled method - from 4 to 12.5 m.
Seamless pipes of random length, made by cold drawn method - from 1.5 to 12.5 m. And measured - from 4.5 to 11 meters.
Pipes of random length, made by the electric welding 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 each part. The maximum excess of the length level as a whole is 10 cm.

Electrowelded profile

Steel electrowelded profile pipe is produced by different technological methods. The first of these is the formation of a profile from a flat billet. In this case, simple equipment is used, which is characterized by low energy costs. However, the resulting product has some disadvantages:

uneven distribution of stresses in the transverse arrangement of the section.
significant thinning of the profile blank in the corners.

In this case, advanced technologies allow changing the negative characteristics, which assume a uniform distribution of voltage at the initial stage. This forms a round billet with the desired volume.

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

Steel galvanized profile

Galvanized profile pipe is a special type of rolled metal. The galvanized profile has increased anti-corrosion characteristics, which prolongs its service life.

Video

The advantageous difference between a galvanized product is:

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

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

Construction of various scales.
Engineering.
Construction of prefabricated structures.

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

Manufacturing features

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

Technological methods for the production of professional pipes are:

pressing round blanks produced at rolling mills. This option is expensive, therefore, the second type is more popular.
Welded connection of tape profiles.

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

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

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

Steel sheets are cut into strips.
After that, such strips are folded into a tape.
It is fed into the rollers of molding machines, which deform flat sheets into professional blanks.
The fastening seam is welded in special chambers, filled with an inert medium.

Video

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

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

Their high strength makes them very popular for the creation of metal structures that stand out for their particular complexity. In the construction market, these products deservedly enjoy high popularity.

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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 shaped 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

This State Standard presents profile pipes made of both seamless and welded steel for general purposes. 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: the mechanical properties of steel are normalized;
products of group B: the presence of chemical elements in a specific proportion, the mechanical characteristics of the base metal are normalized.

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
15		2	0,772	0,606	0,178	0,238
20	10	1	0,544	0,424	0,174	0,266
20		2	0,972	0,763	0,246	0,399
25	10	1	0,644	0,504	0,211	0,371
25		2	0,18	0,918	0,311	0,591
40	15	2	1,96	1,56	0,921	1,72
	15	4	3,49	2,72	1,18	2,52
	25	1,5	1,81	1,42	1,48	1,96
	25	4	4,29	3,37	2,82	3,82
60	30	1,5	2,58	2,01	2,72	4,01
	30	5	7,56	5,95	6,18	9,87
	40	1,5	2,86	2,26	3,91	4,86
	40	5	8,56	6,74	9,58	12,38
80	40	2,0	4,67	3,58	6,42	9,48
	40	7	14,01	10,98	14,98	23,95
	60	3,5	9,11	7,13	17,22	20,22
	60	7	16,81	13,18	27,82	33,31
180	80	7	33,61	26,38	89,43	145,2
	80	12	54,27	42,51	125,8	214,1
	150	8	49,24	38,67	228,8	253,4
	150	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, load-bearing structures are created for sports, cultural and mass facilities, offices, and 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. Complete with wooden elements, they look very aesthetically pleasing.

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 of different lengths with different wall thicknesses, different sections and external dimensions (Table 2):

table 2

The maximum error for the total 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
10	1,4	0,447	0,351	0,101
15	0,9	0,493	0,389	0,216
15	1,4	0,727	0,572	0,292
20	0,8	0,605	0,475	0,369
20	1,5	1,072	0,842	0,601
35	0,8	1,082	0,851	1,201
35	4,0	4,69	3,66	4,18
50	2,0	3,74	2,98	5,73
50	8,0	12,33	9,68	13,89
100	3,0	11,47	9,03	35,78
100	9,0	31,36	24,63	84,33
180	8,0	53,93	42,33	292,68
180	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.

Cutting 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 finished goods 6 m and 12 m long (it is precisely 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 limit 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 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 provide for the use of risers of a non-standard size of such parameters: cross-sectional area, wall thickness, length. Such elements must be tested. Released parts must comply with the Specification of the state regulatory body, which evaluates 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. 4.

Table 4

h	b	t	Square cross section, BUT cm 2	Weight 1 m, kg
mm			Square cross section, BUT cm 2	Weight 1 m, kg
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 found wide application in different areas.

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

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 peers round 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 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 the 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 Houses. 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 simplest questions on what should be the drainage system of a residential building. What should be the size of the drainpipes? 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 way. 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

The construction of any object, whether it is a residential apartment building or a production workshop, is not complete 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 models of equipment allows us to complete the work in the shortest possible time, guarantee its quality and offer customers the best price level 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 of the types of communications requires compliance with special measures in the process of developing pits and digging trenches.

Thus, water supply networks are branched 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 its turn, heating network differ in the significant size of the diameter of the pipes.

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.