Corner metal: assortment. Corner equal-steel steel: assortment, dimensions

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 canopies, constructions of playgrounds, etc. There are several grounds for distinguishing a steel corner.

What kinds of products are there?

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

• The manufacturing method;

• Dimensions;

• The ratio of shelves;

• Accuracy of rolling.

The ratio of weight and dimensions, the type of material used to make the material, the degree of curvature of the angle - all these parameters are regulated by GOST.

Kinds on a way of manufacturing

The steel corner is produced by two main technologies: hot rolling or conventional bending. In the first case, the blank is passed through the shafts on a special machine of complex construction, and then goes to the rolling mill. The bent corners are made of metal strips (can be hot-rolled or cold-rolled) on the roll forming press.

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

When manufacturing bent products, the standards stipulated in GOST 19771-93 and GOST 19772-93 are observed. This corner is used mainly for assembling various kinds of small architectural forms (canopies, arbors), constructions on children's playgrounds (swings, tennis tables) and various decorative elements in the courtyards of houses.

Differences in size

By this parameter, modern enterprises produce a very different metal corner. Its assortment includes products with a section from 140 cm ² to 1.5 cm ² . The length of the corners are:

• Immense;

• Dimensional length;

• Limited length.

Modern enterprises produce this type of rolling from 4 to 12 m. They also manufacture a longer corner on request. The assortment (dimensions, thickness used for the manufacture of steel) of this product GOST determines, including taking into account its permissible curvature. This parameter does not exceed 0.4% of the product's length. The thickness of the shelves of the steel corner usually varies between 3-25 mm. Sometimes these products are made of thicker steel.

Types of shelves

According to this feature, the GOSTs are mainly determined by the range. The angle is equal to the square in the section. This is the most common and often used kind. Such products are used for the assembly of railway cars, trucks, production equipment, as a benchmark for corners in the furniture industry, in the formation of doorways and windows, etc.

The unequal corners in the section have the form of the letter "G". That is, one of their shelves is longer than the second one. This kind of corner is used mainly in the manufacture of different types of metal structures, if the need for its application is specified in the design documentation.

Rolled products: corners and their accuracy

On this basis, standard products are classified into products:

1. High accuracy. Such products are marked with the letter "A".

2. Increased accuracy. It is marked "B".

3. Ordinary accuracy. It is marked "C".

In a free sale, you can often find the corners of increased accuracy, because they enjoy the consumer the most popularity. The steel corner is equilateral, the assortment of which is defined by the standards, according to GOST can have the following permissible deviations in terms of the ratio:

• With a shelf width of up to 45 mm - no more than 1 mm;

• Up to 90 mm - no more than 1.5 mm;

• Up to 150 mm - in the redistribution of 2 mm;

• Up to 250 mm - no more than 3 mm.

The permissible deviations of the unequal angle are also determined by GOSTs and are indicated in special tables, depending on the product number. Below, for example, one of these standards is given.

Corner weight: assortment

According to the standards, the mass of products of this type should be in exact proportion to the length and thickness of its shelves. The presence of any deviations in this plan is not allowed. At the moment it is considered that the enterprise produces the most popular standard variety of this product only if the percentage of deviation from the GOST requirement is no more than 15% of all rolled metal sold.

Special tables are also the most convenient way to define a standard assortment in this plan. An equal-sized corner with different shelves should have a strictly defined weight. The assortment looks in tables approximately so.

Documents defining standards

At the moment, when manufacturing the steel corner, the standards of both GOST and other documents that regulate their parameters are observed. Below we present you a table from which you can precisely know which specific characteristics, what standards are determined.

Despite, it would seem, the simplest design, thus, has a very diverse corner metal assortment. GOST and other documents for its manufacture must be taken into account by enterprises.

How to determine the quality of the corner

Products of this type are used in the assembly of various kinds of bearing structures. Therefore, it is not surprising that high standards are imposed on their quality. The assortment of equal-angled corners GOST regulates in accuracy, as well as literally all parameters of the non-equilateral variant. But how to determine the quality of this product when buying? After all, to check the products for compliance with standards is quite difficult. Ways to make sure that the corner is released with the exact observance of all standards, there are several. When buying, you must first pay attention to:

• Reputation of the corner supplier.

• Reputation of the manufacturer of this product.

• The seller has all the necessary quality certificates.

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

A corner of steel, like any other type of rolled metal, can be sold individually or in tons. Individuals purchase it usually in building hypermarkets or from warehouses of small suppliers. Industrial enterprises purchase a corner in bulk by the usual tons.

Certificates

The assortment of equal-angled corners GOST adjusts exactly. The same can be said about the second version of this product, which has an unequal length of the shelves. Confirms the quality of this product and its compliance with the standards of a special document - certificate. It is issued to producers for a limited period (1-3 years). After the end of the last, the company must again confirm the quality of its products in the Certification Center. On some types of corners such a document must be obtained necessarily. Other groups of these products the manufacturer can certify at will. Usually the companies that produce the corner do just that. After all, this significantly increases the degree of confidence in the quality of products from the buyers.

Obtaining a certificate is not a complicated procedure, but it is responsible and regulated by law. This document is issued at the request of the manufacturer. Copies of the technical conditions for the issuance of the corner, as well as the constituent documents of the company, must be attached to it without fail.

Application

As you can see, products of this type have a range of products regulated by regulations. Corner equal-medium quality of black metal, as already mentioned, is used in production and construction most often. Also, this type of products is very often used in private households and farms. Simplicity of work with this universal type of rolled metal makes it possible to easily make from its own hands designs of any shape that are distinguished by a high degree of reliability.

The most common type

The most popular type of this product is a corner of steel with the size of shelves from 2 to 20 cm. Household plots and repair works use mainly products from 4x4 cm to 10x10 cm. You can tie a house that cracked, corner the carcass , To make a ladder, the frame of the gate, the fence, etc. Mounted from this type of rolled construction, they are reliable, durable and have a very long service life. The only thing, when using a corner of black metal, it must be painted. This type of rolled metal rusts literally right through and very quickly. Acrylic waterproof enamels or oil paints are usually used for the processing of corner products.

Price for a steel corner

Worth the production of this variety is relatively inexpensive. The price of the corner depends primarily on the type of steel used and the width of the shelves, as well as their thickness. Pieces of the most common products of this type - from 4x4 to 10x10 cm - can be purchased for 50-150 rubles per running meter. Ton of the corner, bought in bulk, costs about 25-25.5 thousand rubles. Large lots usually buy at the warehouses of large companies engaged in the sale of different types of rolled metal. In our time, an order with delivery can be made, including through the Internet.

Thus, you now know what this popular type of rolled product assortment has. The corner is equal and unequal - the products are really very popular on the market. So how depends on its quality the reliability of important structures, it must be manufactured in strict accordance with all the standards specified in GOST and other similar documents.