Corner metal: assortment. Steel equal-angle corner: assortment, sizes

The metal corner is widely used in various industries. Products of this type are used in the construction of buildings and structures, bridges, overpasses, in mechanical engineering, in the assembly of awnings, constructions of playgrounds, etc. A steel corner can differ in several ways.

What types of products exist

First of all, the metal corner, the range of which is regulated by GOSTs, differs in the type used for the manufacture of steel. So, for example, in construction often used products made from metal grades St2, St3 and 09G2S. In other industries, a corner made of a wide variety of materials can be used. They make products of this type of ferrous metals, low alloy or even tool steel, stainless steel. In addition, the corner can be classified according to the following criteria:

• manufacturing method;

• size;

• ratio of shelves;

• precision rolling.

The ratio of weight and dimensions, the type of material used for the manufacture, the degree of curvature of the corner - all these parameters are regulated by GOST.

Types of manufacturing method

A steel corner is produced according to two main technologies: hot rolling or conventional bending. In the first case, the workpiece is passed through the shafts on a special machine of complex design, and then goes to the rolling mill. Bent corners are made of metal strips (can be hot-rolled or cold-rolled) on a press brake.

The most reliable variety are products manufactured by the first technology. Hot-rolled equal-angle steel corners, the range of which is determined by GOST 8509-93 and GOST 8510-86, is usually used for assembling all kinds of critical structures. The unequal version of this product is also produced according to certain standards.

In the manufacture of bent products, the standards provided by GOST 19771-93 and GOST 19772-93 are observed. This corner is mainly used in the assembly of various kinds of small architectural forms (awnings, arbors), structures on playgrounds (swings, tennis tables) and various kinds of decorative elements in the courtyards of houses.

Size differences

According to this parameter, modern enterprises produce a very different metal corner. Its range includes products with a cross section from 140 cm ² to 1.5 cm ² . The length distinguish corners:

• unmeasured;

• measured length;

• limited length.

Modern enterprises produce this type of rental from 4 to 12 m. They also produce a longer corner to order. The product range (dimensions, thickness used for the manufacture of steel) of these products is determined by GOST, including taking into account its permissible curvature. This parameter is not more than 0.4% of the product length. The thickness of the shelves of the steel corner usually varies between 3-25 mm. Sometimes these products are also made of thicker steel.

Views in relation to shelves

On this basis, the assortment is mainly determined by GOSTs. The equal-angle corner in the section forms a square. This is the most common and frequently used species. Such products are used in the assembly of railway cars, trucks, production equipment, as a guide for corners in the furniture industry, in the formation of door and window openings, etc.

The unequal corners in section are in the form of the letter “G”. That is, one of their shelves is longer than the second. This type of corner is mainly used in the production of various types of metal structures, if the need for its use is indicated in the design documentation.

Range of hire: corners and their accuracy

On this basis, standard products are classified into products:

1. High precision. Such products are marked with the letter “A”.

2. The increased accuracy. It is marked "B".

3. The usual accuracy. It is marked "C".

In free sale, you can often find corners of increased accuracy, since they are most popular among consumers. Steel corner equal-shelf, the range of which is determined by standards, according to GOST, may have the following permissible deviations in terms of ratio:

• with the width of the shelves up to 45 mm - not more than 1 mm;

• up to 90 mm - no more than 1.5 mm;

• up to 150 mm - in the range of 2 mm;

• up to 250 mm - no more than 3 mm.

Permissible deviations of the unequal corner are also determined by GOSTs and are indicated in special tables depending on the product number. Below is an example of one of these standards.

Corner weight: assortment

According to standards, the mass of products of this type should be in exact proportion with the length and thickness of its shelves. The presence of any deviations in this plan is not allowed. At the moment, it is believed that the company produces the most popular standard variety of these products only if the percentage of deviation from the requirements of GOST is not more than 15% of all rolled products sold by it.

Special tables are also the most convenient way to define a standard assortment in this regard. An equal-shelf corner with different shelves must have a strictly defined weight. The assortment in the tables looks something like this.

Standards Documents

At the moment, in the production of a steel corner, the standards of both GOST and other documents regulating their parameters are observed. Below we present you a table from which you can find out exactly what specific characteristics, what standards are defined.

Despite the seemingly simplest construction, thus, the metal assortment has a very diverse corner. GOST and other documents in its manufacture must be taken into account by enterprises necessarily.

How to determine the quality of a corner

Products of this type are used in the assembly of mainly various kinds of supporting structures. Therefore, it is not surprising that increased demands are placed on their quality. The assortment of equal-angle corners of GOST regulates exactly, like literally all the parameters of an unequal-variant variant. But how to determine the quality of these products when buying? Indeed, it is quite difficult to check products for compliance with standards. There are several ways to make sure that the corner is released in strict compliance with all standards. When buying, you must first pay attention to:

• Corner supplier reputation.

• The reputation of the manufacturer of this product.

• The seller has all the necessary quality certificates.

• The appearance of the products themselves. At the corner there should be no rust, bumps, chips, etc. Of course, the product should not be twisted along the axis.

Steel angle, like any other type of metal, can be sold individually or in tons. Individuals usually purchase it in building hypermarkets or from the warehouses of small suppliers. Industrial enterprises purchase the bulk in bulk, usually in tons.

Certifications

The range of equal-angle corners GOST regulates exactly. The same can be said of the second variety of this product, which has uneven shelf lengths. The quality of this product and its compliance with standards is confirmed by a special document - a certificate. It is issued to manufacturers for a limited period (1-3 years). After the end of the latter, the company must again confirm the quality of its products in the Certification Center. For some types of corner such a document must be obtained necessarily. The manufacturer can certify other groups of these products at will. Usually companies that produce a corner do just that. After all, this significantly increases the degree of confidence in product quality on the part of buyers.

Obtaining a certificate - the procedure is not too complicated, but responsible and regulated by law. This document is issued at the request of the manufacturer. Copies of the technical specifications for the release of the corner, as well as the constituent documents of the company, are mandatory to be attached to it.

Application

As you can see, products of this type have an assortment regulated by regulations. The medium-height equal-angle corner made of ferrous metal, as already mentioned, is used most often in production and in construction. Also, products of this type are very often used in home gardens and farms. The simplicity of working with this universal type of rental makes it easy to make constructions of any shape from it with your own hands, characterized by a high degree of reliability.

Most common type

The most popular type of this product is a steel corner with shelf sizes from 2 to 20 cm. In homestead farms and during repair work, mainly products from 4x4 cm to 10x10 cm are used. You can tie a cracked house into a corner and assemble a carport from it , make a ladder, gate frame, fence, etc. The structures assembled from this type of rental are reliable, durable and have a very long service life. The only thing when using a corner of ferrous metal it must be painted. This type of rental rusts right through and very quickly. Acrylic waterproof enamels or oil paints are usually used to process products from the corner.

Steel Corner Price

It is worth the production of this variety is relatively inexpensive. The price of a corner depends primarily on the type of steel used for the manufacture and width of the shelves, as well as their thickness. Piecewise, the most common products of this type - from 4x4 to 10x10 cm - can be purchased for 50-150 rubles per linear meter. A ton of the corner, bought in bulk, costs about 25-25.5 thousand rubles. Large batches are usually purchased at the warehouses of large companies engaged in the sale of various types of metal. Nowadays, an order with delivery can be made including via the Internet.

Thus, you now know what this popular type of rental range is. Equal and unequal angle - the products are really very popular on the market. So, as the reliability of important structures depends on its quality, it should be manufactured in strict accordance with all standards specified in GOST and other similar documents.