Steel electric-welded straight-line pipes (GOST 10704-91) appeared quite recently, but almost immediately took a strong position in the market. Today, these products play a large role in the construction of facilities for various purposes. These pipes are made from strip or sheet metal. In the manufacturing process, molding or electric welding is used.
The raw materials are low alloy and carbon steel. Steel pipes passing metal rolling are welded with just one seam. Depending on what type of seam is used, pipes are straight-seam or spiral-seam.
Appointment
Electric-welded straight-line steel pipes (GOST 10704-91) are used for gas laying, water supply and the manufacture of structural parts and heating systems. Galvanization can prevent corrosion of the material. It eliminates the worries of maintenance and care. The use of such products allows to increase the operational life and increase safety, because this reduces the likelihood of leakage.
Such pipes are used for pipelines with different flow and pressure indicators. An electric-welded pipe is also used to arrange gas pipelines that are operated at low pressure. These include water and heating networks.
The pipe length can vary from 4 to 12 m. Carbon steel pipes are used for laying pipelines and gas pipelines, the working pressure of which does not exceed 16 MPa. Pipes can be based on calm, boiling or semi-quiet steel.
Specifications
In the production process of the described products, GOST 10704-91 is used. Pipes, the technical characteristics of which will be mentioned below, can have a diameter in the range from 10 to 1420 mm. Moreover, the wall thickness reaches 32 mm, and the minimum parameter is 1 mm. The consumer may agree with the supplier of the goods intermediate values of the diameter and wall thickness.
If you purchase products with a diameter of 57 mm or more, then one transverse seam is permissible. But if the diameter reaches 820 mm or more, then the longitudinal seams should be two, and the transverse - one. Before purchasing a product, be sure to make sure that it was manufactured according to GOST 10704-91. A pipe, the technical characteristics of which you should be aware of, may be represented by products of unmeasured or measured length. In the first case, we are talking about parameters up to 12 m, the minimum value is 2 m. Whereas in the second, the minimum value is 5 m.
The final diameter often affects the length. If the first parameter is not more than 30 mm, then the length will be 2 m. The last value increases to 3 m, when the diameter varies from 30 to 70 mm. If this figure reaches 152 mm, then the length of the pipe can be 4 m.
Pipe classification
The pipes described in the article differ in characteristics. Among others, it should be highlighted:
- resistance to mechanical stress;
- high mechanical properties;
- hydraulic pressure parameters.
When choosing a particular variety, the ratio of these characteristics is of great importance. However, in any case, it is important that GOST 10704-91 is respected. The pipe, the technical characteristics of which are disclosed in the article, can also be subdivided according to the shape of the section, it can be:
- round;
- square;
- rectangular.
Such products also differ in the welding method. In the manufacturing process, plasma welding can be used or work can be carried out using a tungsten electrode. Sometimes pipes are welded in an inert gas environment. Using current, it is possible to obtain a high-quality seam. Laser and beam welding should also be highlighted.
More about the area of use
Electrowelded products are used today in various fields of human activity, it can be construction and industry, as well as the tractor industry and the production of cars and metal structures. A smaller scale is the manufacture of furniture. The product will correspond to the assortment and the main features if GOST 10704-91 will be used in its production. The pipe, the technical characteristics of which should be studied before purchasing products, is also used for the construction of playgrounds, as well as fences.
Classification by physicochemical properties
To date, four groups are known into which electric-welded pipes are divided. Group A combines those that have certain mechanical properties. But if the product belongs to group B, then it must have special chemical properties. Pipes will have certain chemical compositions and special mechanical properties if they belong to group B. When pipes are needed that meet hydraulic pressure standards, the consumer chooses those that represent group G.
Classification of pipes
For the supply of gases and liquids in the field of heating and in the construction of metal structures, as well as scaffolding, pipes of the first class are used. But steel water and gas pipes (GOST 10704-91) belong to the second class. The same products can be used in chemical pumps, oil pipelines and gas pipelines. In the nuclear, chemical and food industries, third-class pipes are used. They are resistant to pressure drops and high temperatures.
Class 4 products are used for oil production exploration. But in carriage building and machine building, as well as in the manufacture of equipment that will be used in the repair and construction field, pipes of the fifth class are used. There is another class - 6. It accommodates pipes that go into the field of engineering.
Pipe weight
If you still do not know which manufacturer to choose when purchasing the products described in the article, then you can pay attention to Regionmetprom LLC. This company offers high quality pipes. You can purchase water and gas products, profile pipes, round welded and galvanized products. Before purchasing, you need to familiarize yourself with the main characteristics, among them - weight. It will depend on the diameter. If it is 10 mm, the wall thickness can be 1 and 1.2 mm. In this case, one meter of pipe will weigh 0.222 kg. By purchasing a 12-meter pipe, you will get products with a wall thickness of 1 mm. In this case, 1 m will weigh 0.271 kg.
The weight of the pipe (GOST 10704-91) when laying sometimes is of great importance. For a 14-meter pipe with a wall thickness of 1 mm, it is worth taking into account the weight of one m, which is 0.321 kg. When the diameter increases to 20 mm, the wall thickness becomes 1.2 mm, while one meter of the product already weighs 0.556 kg.
Another manufacturer and the cost of its products
For the consumer, one of the important factors when choosing is usually the cost. If you have steel water and gas pipes (GOST 10704-91), then you will have to pay 46 rubles for one of them. per square meter. In this case, we are talking about a product with parameters of 15 x 2.8 mm, while the weight of 1 meter will be 1.28 kg. And per ton consumer will pay 36,000 rubles.
When the dimensions are changed to 20 x 2.8 mm, the weight becomes 1.66 kg. This is true for one meter of product. You can buy it for 59.76 rubles. The price per ton remains the same. Pipes (GOST 10704-91) manufacturer "Metal Service NN" offers to purchase. Products from this supplier are presented in a wide range. If you buy a water and gas pipe with dimensions equal to 50 x 3.5, then you will have to pay for a meter from 161 rubles. The weight of 1 meter will be 4.88 kg.
Conclusion
The pipe GOST 10704-91, the diameters of which were mentioned above, is a product with a wide range of uses. It can be used in various designs and for laying pipelines that transport any medium. Such pipes can also be seen in service with some types of industry.