Equal-flange aluminum angle GOST 8509 93 assortment. Solving problems on strength of materials. Assortment of shaped profiles: corner. Rolled corners are made from

The assortment of the corner is much more diverse and wider than many people think. After all, this universal metal product, used in all spheres of production and human activity, is produced with different cross-sectional shapes and different standard sizes, and also from a wide variety of alloys. As a result, all possible versions of the corner are described by several dozen GOST standards, according to which several thousand standard, as well as unique (according to individual drawings) products of this type of metal product are produced.

1

Steel angles are produced in the following main types. According to the manufacturing method, these metal products are divided into hot-rolled and bent, and according to the cross-sectional shape (depending on the ratio of the dimensions of the shelves) into equal-flange and unequal-flange. Thus, steel angles are produced in the following 4 main types and according to the relevant GOSTs:

• hot-rolled equal flange - according to standard 8509-93;
• hot-rolled unequal flange - according to 8510-86;
• bent equal flange - according to 19771-93;
• bent unequal - according to 19772-93.

Hot rolled equal angle

These GOSTs are standards for the range of all steel angles produced for domestic consumers. That is, they contain all standard standard sizes (for the corresponding type of product) indicating the dimensions and cross-sectional area, theoretical weight of 1 linear meter, rolled length, maximum deviations from these parameters and other characteristics.

In addition, in the production of hot-rolled angles for the domestic market, 2 more assortment standards are often used. These are regulatory documents of the so-called “International Organization for Standardization”. Their international abbreviation is ISO, and their domestic abbreviation is ISO. And thus, hot-rolled steel angles, depending on the type of their shelves, are produced according to the following assortment standards:

• equal flange products - according to ISO 657-1-89
• unequal - according to 657-2-2001.

ISO 657-1 can be found in Appendix A of our GOST 8509, and ISO 657-2 - only as a separate document.

Hot rolled unequal angle

Angles manufactured according to these 2 standards are intended for export. Therefore, this product is produced for domestic consumers only upon their request.

The maximum deviations from the dimensions and geometric shape of the corners of the ISO 657-1 and 657-2 standards are specified in ISO 657-5-76. This document is also presented in GOST 8509 - in its Appendix B.

Assortment tables of all standard sizes for the corners of the above 6 standards are given below. The theoretical mass for 1 linear meter for all products was calculated based on the fact that the steel density is 7850 kg/m 3 (the standards indicated equivalent values: 7.85 kg/dm 3 or 7.85 g/cm 3).

But it should be noted that the corner is made from a fairly large number of different steel alloys, the density of a number of which can differ significantly from 7850 kg/m 3, adopted when calculating the mass for 1 m. Accordingly, the theoretical weight of 1 m of such products will differ from the tabulated value . Therefore, if necessary, in order to bring the mass of 1 m in line with the density of steel, you can do.

2

In addition to the main division according to standard sizes and manufacturing method given above, steel angles are also divided according to their purpose and the corresponding alloys from which they are made. This, of course, significantly expands the overall range of steel angles, but based on these criteria.

Steel corner

Each type, determined by the purpose of the corner, is subject to its own separate GOST, which provides the technical conditions for the manufacture of metal products. That is, the steel grades used for the production of this specific type of rolled product, its classification and requirements for quality, strength and other properties and parameters of the finished product are indicated. Moreover, these GOST technical conditions apply not only to angles, but also to other steel products. The latter already depends on the type of metal product to which the technical specifications standard applies.

So, all steel angles (both hot-rolled and bent), that is, those produced according to the previously listed GOST 8509, 8510, 19771, 19772 and ISO 657-1, 657-2, are manufactured in the following types for their intended purpose and according to the relevant standards:

• corners for building and other steel structures assembled (erected) with welded and other connections, as well as for other purposes - are produced in accordance with GOST 27772-2015;
• high-strength angles made of unalloyed high-quality and low-alloy steels, used in products and used for riveted, welded or bolted steel structures - GOST 19281-2014.

Angles for special and general use

And hot-rolled corner profile products (GOST 8509, 8510 and ISO 657-1, 657-2) are also manufactured in the following types according to the relevant standards:

• angles for special and general use, made from carbon steel of ordinary quality - produced in accordance with GOST 535-2005;
• angles for shipbuilding, made of steel alloys with normal and increased strength characteristics - GOST 5521-93;
• corner profile products made of low-alloy structural steel alloys, used for the manufacture of various bridge structures built in normal and northern climatic conditions - GOST 6713-91;
• angles made from steel alloys with normal, high, and increased strength characteristics and used for the construction of sea and river vessels, berths, oil and gas platforms, pontoons, as well as other structures with welded joints (including those intended for operation in Arctic conditions ) – GOST R 52927-2015;
• corner profile products made of structural alloy steel alloys, used for the manufacture of structures for road, railway, as well as combined and separate city and pedestrian bridges, intended for operation in extreme climatic conditions (northern regions and zones with maximum seismicity) - GOST R 55374-2012.

As mentioned earlier, all of the above technical specification standards contain a list of steel grades used to manufacture the appropriate type of angles, as well as GOSTs according to which these steel alloys are produced. In addition, according to some standards of technical specifications, angles produced according to them, by agreement between the customer and the manufacturer, can be made from other steel grades not specified in this GOST. The latter, of course, are also manufactured according to their own specific standards. This, together with the number of standard sizes GOST 8509, 8510, 19771, 19772 and ISO 657-1, 657-2, determines the variety of types and assortments of steel angles.

3

As noted above, this information is given in 3 standards: GOST 8509, 19771 and ISO 657-1. Assortment tables for hot-rolled and bent products of the first two standards can be found in the text of GOST or in the article. There are also other characteristics of this type of rental, given in GOST 8509 and 19771.

Equal-flange bent steel angle

For hot-rolled equal flange products of ISO 657-1 standard (ISO 657-1) intended for export, the dimensions and weight of 1 linear meter must correspond to those shown below in Fig. 1 and in Table. 1. More detailed information about these corners (sectional area, length, etc.) can be found directly in this standard, and the maximum deviations (tolerances) from all dimensions and cross-sectional shapes can be found in ISO 657-5 or Appendix B of the domestic GOST 8509.

Legend to Fig. 1 and Table. 1:

• A – width of the corner flange, mm;
• t – shelf thickness, mm;
• r root – radius of curvature between the shelves on the inside of the corner, mm;

• r toc – radius of curvature at the edges of the shelves, mm.

The radius of curvature at the edges of the shelves was not determined by the drafters of this standard, but can be calculated independently. Its value is equal to 1/2 the radius of curvature between the flanges on the inside of the corner. Based on these data, the theoretical cross-sectional area, mass and other reference values ​​of ISO 657-1 products were calculated.

Table 1

As stated earlier, corners of these standard sizes for domestic consumers are manufactured only in agreement with the manufacturer. The fact is that the rolling mill of the manufacturing enterprise must provide the ability to produce such products.

4 Assortment of standard sizes of unequal flange hot-rolled products GOST 8510

The dimensions and weight of 1 linear meter of unequal flange hot-rolled steel products of standard 8510 must correspond to those shown in Fig. 2 and in Table. 2. More detailed information about these corners (sectional area, lengths, maximum deviations, etc.) can be found directly in this standard.

Legend to Fig. 2 and Table. 2 given below:

• R – radius of curvature between the flanges on the inside of the corner, mm;
• r – radius of curvature at the edges of the shelves, mm.

table 2

5

The dimensions and weight of 1 linear meter of unequal flange hot-rolled steel products according to ISO 657-2 standard (ISO 657-2) must correspond to those shown below in Fig. 3 and in Table. 3. More detailed information about these corners (sectional area, length, etc.) can be found directly in this standard, and the maximum deviations (tolerances) from all dimensions and cross-sectional shapes can be found in ISO 657-5 or Appendix B of the domestic GOST 8509.

Unequal corners

Legend to Fig. 3 and Table. 3 given below:

• A – width of the wider corner flange, mm;
• B – width of the less wide shelf, mm;
• t – designation of shelf thickness, mm;
• r internal – radius of curvature between the shelves on the inside of the corner, mm;
• r external – radius of curvature at the edges of the shelves, mm.

The radius of curvature at the edges of the shelves was not determined by the drafters of this standard, but can be calculated independently. Its value is equal to 1/2 the radius of curvature between the flanges on the inside of the corner. Based on these data, the theoretical cross-sectional area, mass and other reference values ​​of ISO 657-2 products were calculated

Table 3

As in the case of equal-flange products ISO 657-1, corners of these standard sizes for domestic consumers are manufactured only in agreement with the manufacturer.

6

This type of angles, like equal-flange bent products of standard 19771, is divided into several more subtypes: according to the accuracy of profiling into 3 types and according to the steels used for manufacturing - into 2. According to the accuracy of profiling, the following products are produced:

• A – having high profiling accuracy;
• B – increased;
• B – regular.

Products made of semi-quiet and boiling carbon steels

The dimensions and weight of 1 linear meter of products of standard 19772 must correspond to the following data:

• for products made from semi-quiet and boiling carbon steels of ordinary quality, as well as high-quality ones, with a temporary tensile strength not exceeding 47 kgf/mm 2 (460 N/mm 2) - data presented in Table. 4;
• for products made from semi-quiet and calm carbon steels of ordinary quality, as well as high-quality ones with a temporary tensile strength above 47 kgf/mm 2 (460 N/mm 2) - data presented in Table. 5.

More detailed information about these corners (sectional area, lengths, maximum deviations, etc.) can be found directly in GOST 19772.

The cross-section of the corners of this standard must correspond to that shown in Fig. 4. Symbols for Fig. 4, Table. 4 and Table. 5 given below:

• B – width of the wider corner flange, mm;
• b – width of the less wide flange, mm;
• S – designation of shelf thickness, mm;
• R – radius of curvature between the flanges on the inside of the corner, mm.

Table 4

Table 5

7

From non-ferrous metals, standard corners are produced in only 2 main types. The first is products made from aluminum and its alloys. The second type is corners made from magnesium alloys. It would be more correct to call all these products not “angles”, but “profiles with a corner section”. This is exactly what it is called in all GOSTs for it and in other technical documentation.

Steel bent method of bending sheet metal

Figure 11

Figure 12

Due to the fact that these products have a specific cross-sectional shape and, accordingly, purpose, no other data is provided about them within the framework of this article. If necessary, all profile numbers and their dimensions can be found in standard P 50077.

On our website you can find out in your region and choose your supplier.

What is a metal corner GOST 8509-93, GOST 8510-86, GOST 19771-93, GOST 19772-93, GOST 535-88, GOST 380-94, GOST 19281-89.

An unequal angle is a type of metal profile produced by hot rolling, used both in the construction of buildings and in machine tool industry. This profile is produced by hot-rolling from a continuously cast billet, its shape corresponding to a rectangle.

Equal angle angle is the leading type of profile steel, used anywhere and everywhere. This is a fairly cheap profile, has high strength in the longitudinal section and is characterized by versatility of use. Another difference, as mentioned above, is the same length of the shelves.

These products are perfectly welded and mounted in all possible ways.

Ways to use a metal corner.

Together with channel bars, equal-flange angles and other types of rolled products, non-equal-flange angles are used as the main part for the production of frame and truss systems. The angle has enormous cross-sectional strength and low weight, which, together with its low cost, makes it very famous and used everywhere.

The equal angle corner is used everywhere in the economy and in the construction of structures - from the construction of large production facilities and sports-related buildings to summer cottage construction. The main area of ​​use of equal-flange angles is the production of truss structures.

Another example of the frequent use of corners is in mechanical engineering and metal processing.

Production structure metal corner

Uneven-flanged angles are produced on sectional machines using the hot rolling method. The physical differences and characteristics of the produced angle exist in the Equal angle angle is produced by hot rolling from blanks, identical in shape to a square or rectangle in accordance with

According to rolling precision, angles are made:

A - high precision

B - normal accuracy

The lengths of the corners are made:

Measured length

Multiple measured length

Unmeasured length

Limited length within unmeasured

The maximum permissible length of the finished profile is limited to 12 m, however, in some cases, an unequal angle may have a longer length.

The main parameters of an unequal angle are described in the following table:

Current standards

Hot rolled equal flange angle according to DSTU 2251-93 (GOST 8509-93)

Fig.1. Equal angle angle according to DSTU 2251-93 (GOST 8509-93)

Legend:

A - shelf width;

t - flange thickness;

Note :

* - dimensions excluded from the latest edition of the standard.

** - non-standard size.

Equal angle angle according to ISO 657.1-1989 E

Fig.2. Equal angle angle according to ISO 657.1-1989 E

Legend:

A - shelf width;

t - flange thickness;

r internal - radius of internal curvature;

r external - radius of the external curvature of the shelves.

Note :
The mass of 1 m of corner is calculated based on the nominal dimensions at a material density of 7850 kg/m3 and is a reference value.

Equal flange bent corner. DSTU 2254-93 (GOST 19771-93)

Fig.3. Equal flange bent angle according to GOST 19771-93

Legend:

b - shelf width;

S - flange thickness;

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Equal-flange hot-rolled steel angles have found wide application in construction. We offer everyone who wants to buy bent equal-flange corners in Moscow at an affordable price. By steel angle we mean a type of shaped metal. This is an L-shaped profile, which has several varieties.

Today, metal steel corners are in high demand and popularity. They have found their wide application in various fields of industry and construction. Craftsmen use corners during repairs and installation of various structures.

Steel angles are classified according to several important parameters. This is a manufacturing method - hot-rolled and bent steel angles. Special attention is also paid to the area of ​​application. There are equal and unequal. Each person will be able to choose the best option for themselves, depending on their further use.

Production Features

The range of equal-angle angles is regulated by the current GOST. Several important steps are involved during production. First, a high-quality steel billet is selected, which is passed through a rotary shaft. Thanks to such specialized equipment, it is possible to formulate the necessary parameters and dimensions of the future product. The billet is then passed through a rolling mill under high pressure.

It is strictly unacceptable to twist the corner along its axis. The maximum possible angle curvature coefficient is no more than 0.4% of the total length. Also, state quality standards establish maximum possible deviations that relate to length. The value should not exceed more than 0.75% of the total.

To get acquainted with the prices for steel equal-flange angles, you need to contact our company. We employ qualified managers who will take into account all the wishes and preferences of each client. We always ensure high quality service.

Our catalog presents metal corners with the following parameters: 40*40*4 mm, 40*40*3 mm, 25*25 (equal flange), 63*40*6 mm (equal flange) and many others.

Characteristics of hot rolled equal angles

The presented type of rolled metal is made from high-quality square-shaped blanks. The final result after processing is a corner that has equal shelves in width.

There is the following classification by marking:

• - marking “A” is used for high-precision products;
• - marking “B” is used for rolled metal of normal precision.

Steel equal angle angles differ from each other in terms of accuracy, as well as possible permissible deviations from the norm. Our corners, which are presented in the catalog, are produced taking into account established and current state quality standards. All indicators and maximum permissible deviations are regulated by GOST 8509-93.

A product widely used in industry, in the construction of buildings and structures, as well as in other areas of the national economy. Thanks to its special design, this one has increased rigidity and can be used for assembling frames with a large margin of safety. It is a corner of a long steel product, in cross-section resembling the letter “G”. There are only two main types: equal and unequal. In the first case, the width of the “shelves” of the products is the same, in the second - different. The dimensions of the metal corner, its weight and the type of material used for manufacturing are regulated by GOST.

Classification

Equal and unequal angles can be:

hot-rolled (produced according to the standards prescribed by GOST 8510-86 and GOST 8509-93);

bent (GOST 19771-93 and GOST 19772-93).

The first type is characterized by increased strength. Such a corner is usually used when subjected to increased loads. Bent corners are the most popular. They are used everywhere. They are made by bending steel strips using special pressing equipment.

These metal products are also classified into:

standard;

high precision.

The first variety is marked with the letter “B”, the second - “A”.

Metal angle length

According to this parameter, products are classified into dimensional and non-dimensional. There is also a corner of multiple length and limited. Measured products can have a length of 6, 7, 9, 10, 11 or 12 m. Their cost depends on weight (that is, the consumer pays not per unit of product, but for the total weight of the purchase or, in extreme cases, per meter). An unmeasured corner can be of any length. In this case, this indicator varies from 4 to 12 m. Most often, building materials of this type are not too long, since they are often just scraps of measured products.

Sometimes, when manufacturing various kinds of frames, load-bearing structures, etc., it is required that the dimensions of the metal corner be non-standard. In this case, the consumer has the opportunity to order products longer than 12 m.

Length errors

Among other things, GOST regulates the maximum deviations of the corner for this parameter. The latter should not be more than:

30 mm for a corner 4 m long;

40 mm for products up to 6 m;

70 mm for corners from 6 to 12 m long.

At the customer's request, these parameters can be changed towards greater accuracy (40 mm for products 4-7 m plus 5 mm for each meter of length over 7 m). GOSTs regulate not only the dimensions of metal equal and unequal angles, their weight and maximum deviations, but also the degree of their curvature. After all, high-quality products must be smooth. The maximum value of the corner curvature according to GOST should not exceed 0.4% of the length. At the request of the customer, enterprises engaged in the production of rolled metal produce products with a curvature of no more than 0.2% of the length. GOST does not allow twisting of the angle around the axis.

Shelf width and weight

What dimensions can a metal corner actually have? GOST regulates primarily the ratio of the width of the shelves of these products, their thickness and weight. The first indicator varies from 20 to 200 mm. The thickness of the products can reach 16 mm. What exactly should be the ratio of the width of the shelves and the weight of 1 linear meter of the product, see the table below.

Above are the ratios of values ​​for equal flange products. As you can see, with the same width of the shelves, their thickness can be different. The weight of the product changes accordingly. The dimensions of the metal unequal corner, or rather, the width of its “shelves,” can also vary within the range of 20-200 mm. The ratio of this parameter and the weight of products in this case is regulated by GOST and is indicated in special tables.

Steel grades

The strength of a metal corner depends not only on the method of its manufacture, the thickness and width of the shelves. This parameter is also influenced by what material was used to manufacture the product. The corner is made from the following types of steel:

carbon of ordinary quality;

low alloy high strength.

In the first case, metal grades are used, the performance characteristics of which are regulated by GOST 380-88. The quality of low-alloy steels used for the production of angles is determined by GOST 19281-89.

The most popular sizes of metal corners

The most popular products of this type are bent products from grade “B”. This option is cheaper than a grade A stainless steel angle. Moreover, such corners have a sufficient margin of safety so that durable and reliable structures can be assembled from them.

What are the most popular sizes of metal corners? 40 x 40 mm, 50 x 50, 70 x 70 and 100 x 100 mm - this shelf width is the most popular. The first version of products, for example, can be used for the manufacture of canopies, gazebos, benches, outdoor tables, etc. For not very critical structures, such a corner has a sufficient margin of safety.

Products 50 x 50 mm can be used in the assembly of fences, gates, gratings, small children's swings, etc. This material is also used in mechanical engineering, as well as in the assembly of railway cars. The dimensions of the metal corner 50x50x5 mm or 50x50x6 mm allow you to assemble various kinds of frames that experience light loads. In other cases, a less durable option 50 x 50 x 3 or 50 x 50 x 4 mm can be used. This corner weighs more and therefore costs less.

Galvanized steel angle

Very often this type is used for assembling metal structures that are exposed to the negative effects of moisture during operation. Since ordinary steel is susceptible to corrosion, in this case a special type of metal corner is often used - galvanized. This option is quite expensive, but even in the most difficult conditions it can last for decades. The dimensions of the metal corner of this type (width and thickness of the shelves) are the same as that of a regular one.

Products of this type are most often made from carbon steel. Galvanizing can be done in several ways. By simply immersing a corner in the melt, products with a protective layer thickness of 150 microns are obtained. Sometimes galvanizing is carried out in a rotating sealed container at high temperatures. In this case, zinc penetrates into the top layer of steel and, although the thickness of its layer is also 150 microns, it holds much better. Steel can also be coated with this metal by spraying. In this case, it is possible to apply a much thicker layer of zinc - up to several millimeters.

A fairly common rolled metal product can be called equal angle angles. When manufacturing them, the standards established in GOST are applied. Due to this, the products are presented in standardized types. When considering the range of equal-flange angles, one should take into account the fact that weight and dimensions are important for making accurate calculations when developing design or technical documentation. The distribution of the material can be associated with its exceptional performance qualities, which we will discuss in more detail later.

Main characteristics

In technical documentation you can find a variety of information that can be used in calculations. The table used allows you to determine the following characteristics:

1. Weight of one linear meter. The weight of the equal-flange angle is taken into account when calculating what load will be exerted on the structure being created. The weight of a steel angle largely depends on the size and type of material used in manufacturing. The density of the metal used can vary over a fairly wide range.
2. Basic dimensions. The corner can have very different sizes. They are taken into account in calculations. The dimensions of the metal corner can vary over a fairly wide range, as they are used to create various structures.
3. The profile of a metal equal-flange material can have a very different cross-sectional area. This parameter also indicates how much load will be applied.
4. The drawing and other technical information also contains information about the radius of curvature of the profile. This indicator is not a controlled parameter, but is used to calibrate the product. The range of hot-rolled equal flange steel angles can be represented by a material that has even or different flanges. Uneven-flanged versions have also become widespread.
5. The table indicates the wall thickness of the shelves. As the thickness increases, the moment of resistance increases and the product becomes able to withstand greater loads. However, due to the use of more metal, the weight of the product increases significantly.

An equal angle angle can be classified according to its accuracy. Let's take the following product groups as an example:

1. Normal accuracy, marked with the letter "B".
2. Increased accuracy, marking is represented by the letter “A”.

The shelf thickness indicator may have a deviation in accordance with the tabular data.
The regulatory documentation also indicates what length of workpieces can be sent to the customer. As an example, the length indicator should be 3-12 m. By prior agreement, material of greater length can be supplied.

Types of equal angles

Equal-flange versions have become very widespread today. They are produced in various versions. Considering the types of metal corners, we note that the geometric dimensions and classification of products are regulated by two main regulatory documents:

1. Hot-rolled equal-flange angles are obtained by using technology that involves exposure to high temperatures. GOST 8509-93 is used as regulatory documentation. Due to the use of special production technology, the resulting product has very high performance qualities. However, the production process is associated with a fairly large number of technological difficulties.
2. Bent steel angles are also widely used. To standardize the main parameters in this case, GOST 19771-93 is used. Due to the use of cold bending technology, the production process is significantly accelerated.

Download GOST 19771-93. Equal-flange bent steel corners. Assortment."

A distinctive feature of equal-angle corners is that their shelves have the same geometric dimensions. Hot rolled products are produced by passing a hot billet through rollers. When pressure is applied to the softened alloy, a geometric shape and certain dimensions are formed.
When cold bending, special equipment is used that can exert a significant mechanical effect. It is worth considering that in this case, only rolled sheets with a relatively small cross-sectional thickness can be used as a workpiece.

The most common metal used in the production of equal-flange angles is carbon steel. This is due to its high strength and relatively low cost, ease of production.

Corner sizes

The issue of dimensions was touched upon earlier when considering the main indicators that characterize a steel angle. The following points should also be noted:

1. The weight of the product is indicated. Metal corners are used in the manufacture of critical products. That is why the weight of the material itself is also taken into account in the calculations.
2. The main dimensions of the equal-flange angle are also indicated for the development of design documentation and selection of the most suitable product.
3. Equal-flange steel angles are also characterized by profile cross-sectional area, flange width, radius of curvature, and wall thickness. All these indicators are maintained as standards and are not indicated by manufacturers; if necessary, they can be found in reference documentation.

An equilateral corner can have a variety of sizes. A wide range allows you to select the most suitable material for use in a particular case.

Application of steel angle

Metals are found almost everywhere today. Combining lightness and high strength, the material has become almost irreplaceable and is used in the construction of various structures and mechanisms. Steel angles can be made using various metals. Due to their special geometry, they can absorb greater loads than, for example, sheet material. Rolled corner or bent steel angle is used:

1. During the construction of load-bearing structures. In order for the structure to take a large load, the product in question can be used as the main material. An example is the construction of warehouses, when lightweight sheet metal is used as cladding, which covers a stable frame. Due to this, costs are significantly reduced and the strength of the structure is increased.
2. In mechanical engineering and machine tool manufacturing. The special shape determines high rigidity and the ability to absorb vibration loads. That is why the material in question is used to create a reinforcing frame, supporting frame and other elements.

The wide scope of application has determined that corners with different profile shapes and sizes can be found on sale.

State standards for corners

As previously noted, a system of standardization of key indicators is used in production. For example, GOST 8509-93 (hot-rolled equal flange steel angles) determines the geometric dimensions of the profile: radius of curvature, flange thickness and other indicators. The designation of various parameters allows for accurate calculations during design.

Download GOST 8509-93 “Hot-rolled equal flange steel angles. Assortment."