Steel corners are the most popular product of metal. These products are regulated by state standards – GOST 8509-93 and 8510-86. The range of corners includes several varieties, each of which has its own characteristics and purpose. All necessary geometrical and physical parameters of products are indicated in the regulatory documentation. This allows for appropriate calculations during construction.
What are GOST standards for equal shelf corners and other types of products for?
Standardization of metal products allows you to control its quality and dimensional characteristics. GOST contributes to the definition of the required geometric parameters, which are a very important component of construction calculations. For example, a range of equal-angle corners (GOST 8509-93) includes a complete list of the dimensions and technical characteristics of these products. Let us dwell in more detail on the functions that GOSTs perform.
Quality control. If you deviate from certain standards, there may be a problem with changes in performance. Therefore, the first and most important task of state standardization is quality control, which involves fixing the parameters of these parts.
Note! The entire range of metal corners is carried out taking into account the State Standards and the maximum permissible deviations prescribed in them.
Simplification of notation. Metal parts of this type are produced in a wide dimensional range. Without regulatory documentation, all information about the quality characteristics would have to be indicated in the product labeling.
Quick search for the desired part. Tables of the assortment of equal parts and other varieties of these products are indicated in the State Standards and allow you to quickly find the desired item. Classification by the main parameters greatly simplifies finding corners, introduces them to their properties.
It is worth noting that this documentation contains more than 10 different characteristics, arranged in tables with appropriate designations. In turn, in order to find the applied marking, a special drawing is used. The cross-sectional diagram also simplifies the search for the required characteristics.
In the regulatory documentation that regulates steel corners, you can find all the useful information about them. Using the appropriate standard, it is not difficult to calculate the material required for the construction of frame structures of varying degrees of complexity. Consider the main characteristics that can be found in the regulations or calculated using them.
For the construction calculations will require the calculation of the mass of the corners. The calculation of the weight of one running meter allows you to determine the load factor acting on the structure. This indicator depends on the type of product and its dimensions. The size of the corners is an important parameter, as it determines the operational identity of these products. Length, width, and wall thickness – all these data are taken into account during construction. It is also necessary to take into account the shape of products.
Another parameter that is worth paying attention to is the cross-sectional area. This indicator contributes to the determination of the load factor. GOST corner contains special tables that simplify the search for the necessary information.
Experts recommend to pay attention to the radius of the metal product. As a rule, this information is contained in the drawings. This value is not controlled, but it is necessary for the calibration of parts.
All steel corners are divided according to the form of shelves into two types: equal shelf and unequal shelf. In the tables that meet the standards, is the information about the thickness of the corners. GOST 8509-93, the product range of which regulates equal-shelf products, as well as document 8510-93 (containing information about unequal corners) can be easily found on the Internet.
It should be noted that the change in the thickness index has an impact on the performance characteristics of the parts. In this case, a certain pattern can be traced. The higher the thickness of the shelves, the stronger the corners themselves, and therefore, the higher their resistance to stress.
Types of steel angles: GOST 8509-93, 8510-93, 19771-93 and 19772-93
The shape of the section determines the type of steel metal of this type. Corners can be hot-rolled and bent (depending on the method of manufacture). According to the shape of the shelves there are two types of products: equal and unequal. The shelf is one side of the steel part. It may have a different width, which is reflected in the strength and endurance of the part.
Useful information! Equal products have two sides of equal length. Accordingly, for unequal parts, the sides are characterized by different values. Such products have a limited range and are quite often made to order.
The width of the side of the angle of steel may be different. This indicator ranges from 20 to 200 mm. In turn, the thickness does not exceed 16 mm. The mass of the product is calculated in kilograms per meter (kg / m). The length of such parts varies from 6 to 12 m (standard). The dimensions of the corners are needed to calculate the number of parts.
Another parameter by which these products are differentiated is the accuracy class. Depending on this criterion, two types of steel angles can be distinguished. Group A includes parts that have the highest accuracy. Less accurate angles are classified as class B.
Regulatory documentation regulating all types of steel corners, you can easily find on the Internet. Various types of these products regulate GOSTs:
- 8509-93 – hot rolled equal shelf;
- 8510-93 – hot rolled unequal;
- 19771-93 – bent equal shelf;
- 19772-93 – bent unequal leg.
The above standards allow you to control all types of domestic sections of steel. Using such documentation, you can easily determine the geometric and physical characteristics of standard rolled metal products. The GOST also indicates tolerances from traditional figures.
In addition to differentiation in size, all steel corners are classified by purpose. The operational identity of these products may be different. Frame structures are formed from them, and also they are used in the automotive industry, furniture industry, etc. The composition of a steel corner varies depending on the alloy used to make it, which also determines the type of product.
Each type of corner has its own operational purpose. For any type of product there is a separate GOST, which contains information on the production process, as well as on the technical and physical characteristics of the product. In the regulatory documents you can also find the following information:
- about steel grade;
- about product requirements;
- about scope.
Hot-rolled and bent corners of steel, as mentioned above, can be equal-shelf (GOST corner – 8509-93) and unequal-legged (8510-93). Absolutely all products of this type, regulated by various GOSTs, are manufactured according to the applicable standards and are divided into types according to their intended purpose. Consider what types of corners exist depending on the operational accessories.
Construction corners. Products of this type are used in construction for the construction of various steel structures. They correspond to the features of the installation, which is most often done using welding equipment. GOST steel angle of construction – 27772-2015.
Rugged corners. These products are manufactured using special technologies. In this case, low-alloy steel (or unalloyed high quality) acts as a production material. The connection of individual parts is carried out using welding, rivets, as well as bolts. The regulatory document regulating these products has the following number –19281-2014.
Note! Corners, which have increased strength, are used for the installation of steel structures (most often bearing).
Standard (hot-rolled panel) products. Carbon steel is used for their production. This material has standard specifications. GOST metal special-purpose corners – 535-2005.
Shipbuilding products. Used in the construction of ship structures. The corners are made of steel alloys, which often have excellent technical characteristics and, consequently, higher quality. These products are governed by the regulatory document GOST 5521-93.
Corners for bridges. Used in the construction of transitional facilities. For their production it is customary to use low-alloyed steel alloys. It should be noted that products of this type are highly resistant to adverse weather conditions. This allows their use in the construction of bridges in the northern regions. These elements are regulated by GOST 6713-91. They have a special marking and designation. Corners for bridges have a high strength factor.
We should also mention products that are operated in the most adverse weather conditions (for example, during the construction of facilities in the Arctic). They are highly durable and can withstand high pressure. Another type of steel angle is alloyed. These parts are used in the construction of pedestrian bridges. They are well tolerated in extreme conditions.
The list of steel grades, which is used for the manufacture of corners, does not end with alloys, regulated by regulatory documents. Many manufacturers are engaged in the release of non-standard products, relying on individual customer orders. Thus, the assortment of steel corners is incredibly wide.
Indicator of the accuracy of the corners: GOST 8509-93, 8510-93 and others
Another parameter by which steel corners are classified is accuracy. This indicator determines the number of deviations from a fixed norm. Depending on this criterion, two main groups of steel products can be distinguished:
- normal accuracy (B);
The range of steel corners is very wide. To date, there are several varieties of these products, each of which is actively used in construction and production. To determine the geometric and physical characteristics there is a special regulatory documentation. GOSTs greatly simplify the selection and calculation of the number of steel corners.