In the construction industry, one cannot do without knowledge of mathematics, physics, and the ability to make complex calculations. Today, when erecting low-rise buildings, profile pipes cannot be dispensed with. This is one of the most popular types of rolled metal products. Products are divided by purpose, made from different materials. The shape of the products is also different. The weight of the profile pipe affects its cost, the correct organization of transportation. Consider methods for calculating 1 p. m of rolled metal.
Characteristics and types of profile pipes
Professional pipes are steel products in the form of hollow tubes with a cross section other than round. Recently, manufacturers have begun to produce plastic profiles. The cross section of the pipe is:
- in the form of a rhombus;
- flat oval;
- complex shape.
The technological process of manufacturing from steel is the deformation of a round pipe. First, the strip is bent and welded, the finished element is sent for molding. With the help of rolls, it is given a given section. Finished rolled metal products are checked for the strength of the seam, heat treatment is carried out.
In the Russian Federation, steel profile parts are produced with transverse dimensions from 10 x 10 to 500 x 400 mm. The minimum length of the product is 6 m, the maximum is 18 m. The thinnest wall is 2 mm, the thickest is 22 mm.
Scope of application
The first profiles were produced as early as the 19th century, but they have been widely used since the middle of the last century. Today, different types of steel profile pipes are successfully used in the following areas:
- Installation of the frame of low-rise industrial and commercial buildings, residential premises.
- Manufacture of the frame for advertising banners.
- Furniture manufacture.
- Construction of public transport stops, sheds, greenhouses, children’s and sports grounds.
- Manufacture of lamps, shelves, picture frames, flower stands, other interior elements.
- Assembly of fences, supports, auxiliary structures.
Profiled pipes are in demand due to their advantages. What exactly — find out later.
What are the advantages of using
Profiled pipes have a long range of standard sizes. This expands the scope of metal rolling. We note other advantages:
- Strength. This characteristic of profiled pipes significantly exceeds the performance of parts with a round section. Steel elements resistant to chemical and biological attack. This distinguishes them favorably from wooden products.
- Do not deform under high loads.
- Profitability. The cost of profiles is less, since due to the presence of an internal cavity, the amount of metal spent is less.
- The weight of shaped steel pipes is much less than similar wood products. This facilitates loading and installation work.
- When designing structures from pipes with rectangular and square sections, there are no problems. They are easy to calculate taking into account rectilinear cuts.
- Ease of installation. Profile tubes are easily cut with a grinder, it is convenient to fix them. During installation, there are no difficulties in using shaped parts.
- Fast installation. Even the most complex structures are installed as quickly as possible.
- Products comply with sanitary and hygienic norms and rules.
Profile pipes made of special grades of steel are used in the Arctic, Primorsky Krai. In regions with adverse weather conditions, the speed of erection of the frame for buildings and other lightweight metal structures is especially important.
Important! Using lighter types of rolled metal in construction, it is possible to switch from heavy cement-based materials to lightweight ones. This will allow the construction of buildings with less load on the foundation.
Assortment of profile pipes
To streamline the entire existing variety of professional pipes and their classification, the concept of assortment has been introduced. This is a set of types of profiled metal products manufactured by enterprises.
The assortment of a steel profile pipe is drawn up as a list or table. Each type of product is listed according to their names according to GOST. The lists contain all types of products: names, characteristics. The range of pipes is varied. They are classified according to many characteristics, but the main one is the configuration of the section. The most common are rectangular and square elements. They are in demand due to their strength, durability and affordable prices.
According to the manufacturing method in the assortment, steel professional pipes deformed by cold and hot methods are distinguished. GOST also includes products made by electric welding. Cold-formed and welded parts are coated with a layer of zinc to prevent rust.
Why you need to know specific gravity
The weight of a professional pipe is an important characteristic, since the cost depends on it. However, the definition of this value affects not only the correct organization of transportation and price. It is necessary to know it so that the operating conditions of the products meet the tasks.
Important! To calculate the mass of 1 linear meter of a professional pipe, data on the amount of material for its manufacture will be required.
Profiled pipes are widely used in the construction industry. Without knowing their weight, the designer is not able to calculate the loads:
- maintained by the erected structure of profiled metal;
- created by the structure itself.
The physical and mechanical characteristics of profiled rolled metal depend on its weight. Knowing the value of the parameter will allow you to correctly develop a project, according to which a reliable object will be built in the future. The probability of destruction is important to reduce to zero. Therefore, when designing building structures, a specialist identifies the features of the skeleton, selects the optimal profile materials for installation. The simpler the structure, the easier it is to determine the mass of pipes and other characteristics.
The dimensions and weight of rolled metal products must be known for other purposes as well. These values affect the features and storage conditions. You can’t do without them when calculating the transported cargo: it is important to know the number of meters in a ton of profiled metal.
What does mass depend on?
The weight of 1 p. m of pipe metal depends on several parameters:
- amount of material;
- sectional shape;
- pipe wall thickness;
- material density;
- geometric data.
The simplest and most convenient parts are with a rectangular and square cut, since they are easy to fasten to each other. The mass of 1 m of the tube is calculated by several methods. Formulas have been developed to determine the desired value. The result obtained will be needed to calculate the mass of profiled metal. It is necessary to obtain performance characteristics for a construction project.
Steel parts made of different grades of material differ in weight even with the same dimensions. The most exploited are products of the following sizes:
Important! Professional pipes from different manufacturers often have different weights even with the same dimensions. This situation is related to the availability of permits. Even the dimensions fixed in GOSTs may differ from the actual ones.
Method for determining the mass of 1 p. m of a rolled metal profile
For high accuracy, an individual weight calculation is best suited. The formula for determining the parameter is very complex, it takes into account all the main indicators. Such mathematical calculations are performed by designers when designing the frame of buildings and structures from profile metal. The formula looks like this: 1 p. m parts \u003d (Lone + L2) x S x 2 x ρ, where:
- Lone and L2 is the length of the sides, m;
- S is the wall thickness, m;
- ρ is the density of the alloy.
To find out how much 1 running meter of a square or rectangular profile pipe will weigh, in addition to the formula, it is recommended to use the following options:
- specially designed tables that are presented in the literature and on the Internet;
- online calculators.
It is easy for users of online programs to determine the weight of even round profiles, as well as pipes of a different section shape. To get the result, it is necessary to enter the initial data into the form (length, section shape, wall thickness). In the pop-up menu, you need to select the material from which the rolled metal is made. The characteristics of the most popular steel products of domestic manufacturers are listed in the tables.
|Section parameters, mm||Weight 1 item m, grams|
Rectangular section — GOST 8645 82
|Section parameters, mm||Weight 1 item m, grams|
To determine the mass of the profile according to the tables, it is necessary to multiply the length by the weight of 1 running m. The tables show the weight of rolled metal for an average density ρ = 7850 kg / m3. This value varies depending on the content of carbon in the steel. The more it is, the less the mass of the alloy. When it is required to calculate the mass of profile products for a specific value of ρ, the value given in the table is divided by the average parameter and multiplied by the density of a particular alloy grade (kg / m3):
- corrosion — 7900;
- stamped — 7800;
- instrumental — 7700;
- ordinary carbonaceous — 7870;
- low-alloyed and high-quality carbon — 7850.
The accuracy of tables is lower than volumetric calculations using formulas. Therefore, it is preferable to determine the weight mathematically.