Rectangular profile pipe sorting. Sort of profile pipes. GOST and assortment of black steel and stainless steel pipes

GOST 30245-2003 regulates the basic requirements for the manufacture of closed welded profiles for building structures. The sorting 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.

At the stage of pipe development, round profiles with longitudinal seams are used, subjected to firing with rolls to obtain a square or rectangular profile. Works are carried out on special launches. Steel is taken as the basis:

• Sheet metal rolled.
• Carbon steel universal application.
• Low-alloyed thick-walled steel (from 3mm and more), according to TU 14105509.

Elimination of graphs with longitudinal seams is performed 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 section of 0.4 cm.

The quality of finished products is governed by the main positions of the sorting:

3 Sortiment

3.1 The main parameters of the profile cross section are displayed in Fig. one.

3.2 Other indicators (S sech., Axis and weight parameters for 1 M shared element) are determined by the corresponding indicators: for pipes with equilateral walls - Table. one; For rectangular products - Table. 2.

3.3 Permissible errors of the thickness of the material correspond to the limit deviations of the initial blanks width 125 cm of the regulatory accuracy of the rental "B" according to GOST 199-03. Deviations are allowed in the sections of the bend.

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

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

3. 5 Deviations of radii of the outer circle are allowed:

• If T.
• If 0,6.
• If T\u003e 1 cm - from 2,401 T to 3,601 t.

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

3.7 Profile pipe length 600 - 1200 cm, and when the customer is wished, 400 - 1300 cm:

1. Non-merchates.
2. Dimensional parameters.
3. Multiple dimensional sizes.

3.8 Maximum tolerances to the length of the dimensional and multiple dimensional values \u200b\u200bare +6 cm.

3.9 Below are the conditional values \u200b\u200bof the bent electrical welded structures with vertical parameters \u003d 18, horizontal cross section \u003d 10, the thickness of the simpleness \u003d 0.5 cm. In the specified example, the steel brand is used C245 according to GOST 277-72:

Table. one

Table.

The scope of the use of profile pipes is extremely diverse, therefore, their advantages and disadvantages are worth talking in more detail. In this material we will tell about what the sorting of the profiled pipe, as well as which qualities of products should be paid to their purchase.

The very concept of "sorting" 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 of various types of products classified for a number of parameters, which are presented from manufacturers or at wholesale or retail points.

A complete sorting of the profile pipe includes everything without exception to the names of these products manufactured according to GOSTAs, and also describes the qualitative characteristics of each category in all possible modifications.

In general, the classification of profile pipes can be carried out in various indicators. One of the most significant characteristics is the form of a profile.

Distinguish such varieties of products:

• oval;
• planes;
• square;
• rectangular shape;
• with hollow ribs;
• with a special form profile.

It is worth noting that the sorting of steel profile pipes is developed separately for each type of profile in full compliance with the GOSTs.

In addition, the variety of profile pipes is also determined by such factors as:

• the production method of pipe rolling products - welded, cold or hot-rolled);
• raw materials from which pipes are manufactured;
• methods of processing end parts;
• a branch where the use of certain types of pipes is provided.

By the size of the sorting of products presented in the manufacturer's market, one can judge its potential, possibilities and scale of production. And although the expansion of the list requires considerable costs, it still indicates the stability of the enterprise.

Detailed description of the sorting

Extremely widespread use of profile pipes in the process of assembling metal structures for various industrial facilities. They are not only able to replace the bars used for carrying structures, but also have a small mass and are inexpensive.

In addition, when choosing a type of pipes, it is necessary to take into account the mass of the route of such products.

Most often, the plugs are squares square rectangular with such parameters:

• 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 call all pipes, the form of the cross section of which is not round. Most often there 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 is worth noting that due to the variety of output of the sizes of profiled pipes, it became possible to construct more and more complex structures.

Among the main advantages of pipes from the profile can be called:

• low metal content, which allows you to save up to 25% of raw materials for the construction of a particular object;
• due to the convenience of installation, the construction of the structure is made very quickly;
• convenience in sanitary and antiseptic processing, hygienicism;
• full compliance with fire safety standards;
• the ability to build structures of increased complexity.

Scope of use of pipes from the profile

Due to the variety of sections and forms of profile pipes, the scope of their use is extremely wide.

In particular, the use of such products will be appropriate in such cases:

1. To assemble the framework of buildings, if there is a need for metal savings, it is often used to use pipes with a cross section of 60 × 30 mm.
2. As structural elements, a pipe with dimensions of 15 × 15 mm, 40 × 60 mm, 60 mm and 100 mm are acceptable.
3. Among the advantages of products with parameters 25 × 25 mm and others can be called the moment of resistance of the pipe pipe, that is, its strength, a small mass, high speed and convenience of assembling metal structures of them, as well as high tightness.
4. Good performance indicators of profile pipes, as well as their versatility, make it possible to apply them in almost any fields of activity. In particular, profiled products with dimensions of 25 × 250 mm are actively used in the machine-building industry. But 60 × 30 mm pipes are in demand for assembling billboards and banners.
5. In the construction of large facilities of the housing stock, public structures, as well as warehouses and garages are very popular pipes with parameters 40 × 60 mm, 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 of various purposes. If the construction of light partitions or structures is required, which will not have a large load, the profiled pipes with thin walls are perfect for these purposes.

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The concept of the assortment

What is it - "sorting"? Under the meaning of the word implies a list of a specific product presented in the market or a list of products manufactured by the manufacturer.

If you take profile pipes, then the sorting of these products includes all types of products that are manufactured at enterprises or are in warehouses of suppliers.

Conveniently a sort of profile pipes represent in the form of tables. They contain, among which are more often used square and rectangular details of a wide range of products.

The profile is one of the main parameters of the details presented in the table. In addition, it may indicate the steel brand, the size of the profile, the thickness of the wall of the product, the yield strength, the method of manufacture, other characteristics, familiar with whom we have a complete picture of the products.

GOST 13663 86.

This State Standard presents profile pipes made of steel both seamless and welded type of general purpose. For the manufacture, various groups of carbon and alloy steel varieties are used.
The linear parameters of the profile steel rims are fixed in special tables that can be easily found on the Internet.

Elements can be:

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

The assistance is preposed the presence of 2 groups of profile pipes, respectively, GOST:

• products of Group A: The mechanical properties of steel are normalized;
• the products of the group B: the presence of chemical elements in a specific proportion, mechanical characteristics of the base metal are normalized.

The product group index during its marking - A or B, is affixed in front of steel brands.

The assortment is preposed the presence of steel profile pipes with heat treatment and without it.

No specialists in this industry sometimes talk about the range of steel profile pipes GOST 13633 86. It turns out that this standard does not exist at all, and the numbers probably they just confused and instead of 13663 call 13633. That's all. So you need to be extremely attentive and accurate before we talk about state standards.

Let us dwell on rectangular and square elements that are more in demand in comparison with the analogues of other sections.

Rectangular Pipes GOST 8645 68

As stipulated in the standard and, accordingly, pipes can be produced:

• seamlessly (hot and cold deformation);
• welded method (electric welding with hot and cold calibration, oven welding).

As GOST 8645 68, GOST 8639 82 is used in practical activity, the sorting of which is also large enough.

The form of rectangular elements should be like in the drawing.

In Table 1, it is also some parameters of rectangular general-purpose products.

Table 1

Length section	The width of the section	Wall thickness	Cross-sectional area	Mass of 1 M.	The 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

Features of application

The risers are made in a close ratio of linear parameters with wall thickness. Thanks to the ribs of rigidity, the design of rectangular parts is distinguished by strength, reliability, long service life and other positive properties.

Rectangular cross sections are applied in:

• construction industry. With their help, bearing structures are created for sports, cultural and mass purposes, offices, other premises. From rectangular parts, perfect railing is obtained, a variety of decorative fences;
• engineering. Modern tractors, agricultural machinery, heavy trucks, trailers are mounted on frames from hollow rectangular risers. A small mass in a complex with high strength is the main condition for creating reliable metal structures;
• agriculture. Constructed greenhouses, greenhouses, canopies for seeds, technicians, other structures easily withstand serious both transverse and longitudinal loads;
• furniture industry. Such risers are available in every school desk, in every chairs. They provide furniture for medical and social purpose institutions. In a set with wooden elements, they look very aesthetic.

Without them, it is impossible to do when the framework of trading pavilions, canopies, temporary and permanent advertising structures.

With their help, devices that contribute to the execution of work inside and outside the room are mounted.

Effective interaction with planes contributes to the expansion of products. Due to the rectangles of the details of the structures, the spectrum of functional destination of the final product is significantly expanding.

Despite the savings of metal during production, rectangular risers are a fairly qualitative, in demand product. Rectangular details are available to consumers, which is associated with competitively capable product costs and high quality.

GOST 8639 82.

This standard we are talking about a square profile pipe, for the manufacture of which uses:

• seamlessly (hot and cold-deformed elements);
• electrical weld (cold-deformed, hot-chaired parts).

The document applies to the sortiment of profile pipes GOST 8639 82 square sections, for the production of which also used oven welding.

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

table 2

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

The drawing indicates the form, and Table. 3 per dimensions and other parameters of the profile square pipes GOST 8639 82.

Table 3.

External dimensions MM.	Wall thickness, MM.	Cross-sectional area, CM 2.	Mass 1 m, kg	Moment of resistance See 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

Square GOST 30245 profile pipe cutment

This standard stipulated not only the parameters of square articles, but also the technology of their production.

One of the main areas of application of such parts is a capital construction.

For absolute confidence in the strength, reliability of structures, it is necessary to use only the assortment of steel profile pipes that correspond to GOST.

Production of an extensive sorting of profile square risers as varieties of rectangular products is carried out accordingly. Elements may be measured, nemery. If necessary, you can purchase details of multiple measuring.

Slowing individual elements of finished products, enterprises adhere to the State Standard.

The document emphasizes that:

• the minimum length of the details cannot be less than 4 m, and the maximum is not more than 13 m;
• more often than other buyers are interested in finished products with a length of 6 m and 12 m (it is elements with such line parameters that can more often meet in construction stores);
• when cutting dimensional parts, it is necessary to adhere to the limit deviations of order up to 60 mm;
• the customer determines the required length, but it should be within the limits specified in the regulatory documents.

For square-section products, the standard requires the length of the side of the parties, the linear dimensions of which can be between 50 mm to 300 mm. The product assistance is foreseen for the thickness of the element to its size. With the increasing latter parameter, the wall thickness should also increase (the minimum value is 2 mm, the maximum is 14 mm).

Separate structures foresee the use of non-standard size of such parameters: cross-sectional area, wall thickness, length. Such elements must be tested. Produced parts must comply with the technical conditions of the state regulatory body, which evaluates their level of security. On the labeling of parts there is a designation of that.

The form of details is indicated in the drawing.


With separate parameters of some product sizes
you can find it in Table. four.

Table 4.

h.	b.	t.	Cross-sectional area, and CM 2.	Mass 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

On the operational characteristics and fields of application

The design of the square riser is a closed profile, for the formation of which the metal strip is used. From the design features, the manufacturer's material is dependent qualitative characteristics, manifested during the operation of products.

Such products are different:

• increased resistance to bending and twist;
• strength;
• reliability;
• a small mass;
• long service life.

Today it is difficult to present human activity without square risers. They found wide use in different spheres.

The profile is the basis of modern industrial and domestic construction. Reconstructing old construction facilities and building new, the details of square sections are used to create roofing frames, overlap.

Without them, it is impossible to present functioning:

• furniture industry (shelves, racks, chairs, tables, cabinets);
• mechanisms of machine-building industry;
• agriculture (canopies, garages, utility rooms, animal farms);
• advertising business, other directions of human life.

Compared to the analogues of the circular cross section, square and rectangular profiles after high loads bend. Moreover, after stopping the load, the riser occupies the starting position. This is their strength and reliability.

The round products, with a similar effect, can not only be deformed, but also completely collapsed.

Stages of production

Square steel profile tubes GOST 30245 2003 is foreseen to the use of sheet steel steel made of carbon and low-alloy groups with thick sheets 3 mm, 4 mm and above. Separate orders are manufactured using high-quality steel steel brands.

After determining the method of manufacturing, cross sections of products, production begins, which foresees several stages:

1. Unwinding, cutting roll sheet rolled on the strip of a certain width.
2. Formation of a long ribbon with sliced \u200b\u200bstrips by welding.
3. Feeding the tape, forming from it on the molding machine of products with square cross section.
4. Jumping a connecting longitudinal seam formed as a result of the bending of the workpiece.
5. Removing to a minimum (residue not higher than 0.5 mm - 1 mm) graph with welded seam.
6. Conduct control measures regarding the quality of welded seams. When deficiencies are found - they are removed.
7. Cutting quality segments of products required.
8. Packing of finished elements.

Finished packaged products are sent to the storage warehouse.

Video

Drains. You should know it!

The drainage system is one of the most important outdoor design systems at home. This design is not just a home decoration, or tribute fashion. The drains are designed to collect and destroy the flow of rainwater with the roof of the building in a specially designated place away from the foundation of the building.

How to calculate the drain

A properly working drainage system protects against premature wear roof, roof, walls of the house, building base and foundation. Not to mention the aesthetic component of the use of drainage.

They save you from dirt at home, pudded at the base and random drops. Consider the simplest questions on which there should be a watering system of a residential building. What should be the size of the drain pipes? The size of the pipes depends on which part of the country you live, from the average annual amount of precipitation and from the area of \u200b\u200bthat part of the roof to which drain is calculated.


With a moderate climate, the calculation takes into account that with 1.5 cm² of the cross section of the drainage is enough to drain the water with 1m² roofing. Based on this, the pipe in diameter is 10 cm. Can merge water from the roof area of \u200b\u200babout 53 meters.

What material is best used for the manufacture of gutters and drains?

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

Installation of copper drains will cost expensive, but when properly maintenance, these drains will serve dozens of years. If you live in the area with small temperature variations, then vinyl drainage is a rational choice.

Seamless drainage or not? Seamless drainage and gutters, according to experts, is the best option. These gutters are manufactured under specific sizes. Such an option of the waterproofs will be more expensive to the owner of the house. The prefabricated gutters over time proceed and bend. With any choice, the installation of drains is desirable to conduct a specialist in this area of \u200b\u200bconstruction.

Laying engineering communications

The construction of any object, whether it is a residential apartment building or production workshop, does not cost without the arrangement of communications supplying heat, water and gas in the building.

Given the complexity and volume of this type of work, appropriate and profitable will be to appeal to specialists offering services in the field of laying and connecting engineering communications of all kinds.

The use of carefully selected materials and modern samples of technology allows you to complete the work in the minimum time, guarantee its quality and offer to customers the optimal price level for the services offered.

Trench or trenchless way

Depending on the purpose of the object and the features of the soil, work on the arrangement of communications can be carried out by a trench or trenchless way.

The first is considered traditional - it requires the time and use of excavator technology, as well as - the need to prepare a place for temporary placement of the soil learned from the ground, the place of which will take pipes and their finish.

In turn, the trenchless method is a modern, designed, due to the need to arrange communications in difficult places underground, when the task is to maintain transport pathways and buildings on its surface. The main methods of the trenchless arrangement of communications are horizontal or obliquely drilling, priming 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 compliance with special measures, in the process of developing catlots and rods.

Thus, water supply networks are distinguished by branching and the need to arrange frequent wiring to a number of objects. Their arrangement requires, first of all, compliance with conditions for the preservation of conducting properties and protection against negative external influences, as well as - economical operation and ability to carry out the care and periodic control.

In order to economically and quickly fulfill all types of work, construction and housing and public utilities are renting construction equipment and equipment.

In turn, thermal networks are characterized by a significant size of pipe diameter.

Their design requires carefulness and attention, as well as the selection of materials, on the one hand, resistant to long-term thermal exposure, on the other, capable of withstanding the temperature in the ground in the winter period, and with the third, to ensure the safety of the coolant temperature.

Therefore, the design of work on the arrangement of heatpets trust experienced specialists guaranteeing compliance with all necessary conditions.

In construction, automotive and other industries, not only round tubes are needed, but also rectangular steel pipes, as well as steel pipes of a rectangular section. These profile products withstand the load are large than ordinary round items, and this is the safety and long-term operation of the construction structure.

The profile rectangular tube also proven itself in the production of consumer goods - in the manufacture of furniture and other frame products, during the construction of fences and fences, greenhouses and pavilions. Survived sizes of standard rectangular pipes and square section according to GOST 8645-68 are as follows:

Surge of square pipes:

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

Rectangular products:

1. Section in section: 15 x 10 mm to 180 x 150 mm;
2. Wall thickness: 0.8 mm / 12.0 mm;
3. Weight of one rowing 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 profile products

The metallurgical industry has mastered the production of such a metal rolling:

1. Steel pipes of rectangular sections designed to build supporting structures. The iron pipes of the rectangular section look more aesthetic, although, according to the criteria, the strength of the boutons would be preferable;
2. For lightweight structures with a small weight working in the conditions of the importance of design and appearance, seamless rectangular pipes made of stainless steel are made, the surface of which is pre-polished and polished;

Pipe metal products in the form of a rectangle or square apply only for the construction of any metal structures: for laying pipeline mains, they are used very rarely for the following reasons:

1. Any steel rectangular tube has a smaller internal volume than a round-shaped product, which means that in 1 meter, the pioneer of such a product passes less liquid or gas in 1 hour than in the usual round of the circular cross section. Thus, the performance of pumping the working medium through steel pipes of a square or rectangular section is much lower;
2. Rectangular metal pipe keeps the stretching load, twisting and bending, but the internal loads it withstands much worse. That is, with a high internal pressure of the working medium, a steel pipe of a square or rectangular profile can give a crack or even break;
3. Round pipes are less weigh than rectangular products, which means that the total weight of the square highway will be larger;

Standardized sizes of the profile pipe affect the scope of their application:

1. The size of the profile pipe 60 x 30 mm means that these are products with low metal consumption, and it is possible to use them to save construction;
2. The dimensions 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 when assembling structures of all sorts of dimensions and complexity;
3. The dimensions of the profile pipes of 25 x 25 mm also weigh, due to small sizes, have high strength and degree of tightness, simply and quickly collected in any forms of metal structures.

Additional areas of applying steel square and welded pipes of rectangular sections:

1. The dimensions of the proftrube 25 x 250 mm are used narrow-profile - in mechanical engineering in the manufacture of frames and frames;
2. The pipe profile cross section of 60 x 30 mm is used when assembling advertising bords, frames and shield structures of different complexity and configuration;
3. Pipe rolling products of other 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 channels, internal and external, as well as at mounting capital or lightweight construction Objects: Warehouse, hangars, canopies.

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

Background table of size and description of other parameters of pipe products of rectangular, oval and square sections:

The advantages and features of rectangular metal structures and elements for them are:

1. The proportion of rectangular elements of different diameters is always less than this parameter of a solid rectangular rod with the same cross section. For the largest geometric sizes of rectangular pipes 230 x 100 mm, such elements weigh only 37-38 kg, despite the fact that the mass of one-piece beam having the same dimensions will be about 1000 kg. Therefore, even the largest thickness of such profile elements does not detract from their advantages over whole-grade chapels, heated or beams;
2. Cut or weld pipes relatively with solid elements is much easier and faster. In addition, the pipe steel rectangular sorting of which reflects a small table, easily deformed to a curvilinear product with the help of conventional pipe bending, meanwhile, it will take a hydraulic blacksmith press for flexing;
3. The cost of rectangular and square pipes without a seam is less.

Varieties of rectangular pipes

The size range, given the length and thickness of the walls of profile rectangular pipes, is so extensive that, choosing a product for certain operating conditions, it is recommended to take into account the product manufacturing technology that determines the scope of product use.

The basis of the classification of profile elements is the sorting. Considering the pipe manufacturing technology, the range of these profile elements of the construction market is divided into the following categories:

1. Hot-deformed seamless products that are manufactured using hot rolled technology;
2. Cold-deformed seamless products that are manufactured using cold rolled technology;
3. Welded elements that are obtained using electrical welding.

The remaining technology of rolling and other methods of manufacturing metal profile pipes are not sufficiently effective and payback.

GOST and assortment of black steel and stainless steel pipes

The standards used in the modern industry concerning the production and sorting of profile and other metal products were approved in the past century, but applied so far, since their requirements have not lost their relevance: this is GOST 8639-82, GOST 13663-86, GOST 8645 -68 and GOST 13663-86. And, although the requirements for cold and hot rolling provide sufficient strength and duration of the operation of products, elements of rolling products are less in demand than welded, due to the fact that welding can be easier to change the direction of the line and bending separate parts of the design. Therefore, choosing the necessary range of profile products, it is recommended to pre-acquaint geometric sizes and with the technology of manufacturing certain profile parts.

The manufacturing technologies of any profile stainless steel elements are not fundamentally different from the production methods of black steel pipes, more susceptible to corrosion of the metal besides a separate item - cost. Due to the high cost of production, stainless profile details are practically not in demand in the construction of large-sized and heavy objects with high supporting loads, and therefore, the requirements for the strength of rectangular stainless steel pipes are underestimated compared to the same requirements for conventional steel.

Therefore, most often rectangular stainless profiled products are manufactured by welding using HF technology, which is based on exposure to metals of induction currents, and is relatively cheap technology.

For the sorting of stainless rectangular or square pipes of individual standards and standards, it does not exist, therefore, the GOST for parts made from ferrous (corrosion-resistant) steel are used, and standards for feedstocks.

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

Building organizations have a special table on the sorting of pipe products of rectangular and square size from steel, but since stainless steel has a greater density than black corrosion-resistant steel, its specific mass for the 1 row meter will be somewhat larger, and for each row Product companies have their own sorting products of its own production.

When ordering and buying profile products made not a large company, but a semi-pedestar method and an unknown manufacturer, responded to the fact that such products are dangerous to use for the construction of any carrying structures of large sizes and weights. The danger is that such products are rarely processed in the thermocamera after rolling, and in the products there are internal stresses affecting the strength of products, especially in severe operating conditions.

Where rectangular pipe elements are used

A large range of sizes of profile elements of a square and rectangular section is the possibility of using them in almost all sectors of the national economy, including private construction.

In addition, the sorting allows the following nodes, elements and details of the structures:

1. Large framework of carrying structures with a large thickness of the profile walls, for example, 196 x 170 mm. Such products ideally provide strength and resistance to any types of loads of objects: hangars, warehouses, shopping centers, hypermarkets, sports complexes, skeletons of high-rise buildings, etc;
2. Decorative fences and security fences. Such structures are most often made from profile stainless steel, have small size and prefabricated design. Stainless steel for scenery is better than rusting with black steel fencing time;
3. Furniture and its components: metal chairs and tables for public premises, student parties, furniture for medical institutions, public organizations and social institutions;
4. Frames for a winter garden, small-sized greenhouses and greenhouses. On the lightweight steel profile frame, you can quickly pull the film or glazed.

Profile metal products - an indispensable node of any construction object and general-purpose metal structures. Such a profile is widely used in individual construction, in compliance with the low loading of thin-walled frameworks.