Chernivtsi pipe steel seamless cold-smoked, hot-smoked steel st20, st45 6-630 mm (Metallobaza) delivery, cutting

Depending on the purpose, seamless steel pipes are divided into 6 classes: 1 class. Such pipes are designed for laying irrigation systems, electrical lines, as well as transporting gaseous mixtures and various liquids. Also, fences, scaffolding and other similar structures can be assembled from such rolled products. Grade 2 This is rolled products for main pipelines, through which water, oil, gas, solids, fuel and oil products can go. Grade 3 Such pipes are used in environments with high pressure and temperature loads. 4th grade. Products are used in the oil industry as auxiliary elements, parts of drilling and casing structures. Grade 5 This is pipe rolling, which is used as structural elements of masts, towers, cranes or supports. Also, parts of furniture are made from such pipes. 6th grade. Pipes for various branches of engineering. They are used for the manufacture of cylinders, pistons, bearings. They are also used to make tanks for high pressure loads and shaft rings. This division greatly facilitates the choice of pipeline for a particular production. But still, in order to buy seamless pipes, it is better to seek the advice of specialists. In most cases, this will save time. Limitations in the use of seamless steel pipes Another condition for the competent purchase of a batch of pipes is the knowledge of some limits in their use: Pipelines with cold water in apartment buildings. Permissible diameter - up to 150 mm. Hot water supply and heating at industrial facilities and residential buildings. The outer diameter should be between 40 and 50 mm. Main oil and gas pipelines. Pipes with a diameter of 1020 mm or more can be used. Hydraulic systems of cars and road equipment. It all depends on the amount of liquid. The pipe diameter can vary from 8 to 50 mm. Chemical and oil and gas industry. For internal transfer of liquids, pipes up to 273 mm are suitable. In construction, rolling of diameters from 650 mm is suitable for driving the supporting structures of bridges, foundations, piles. The permissible diameter of sewer pipes can vary from 530 to 1020 mm. Products with a diameter of up to 325 mm are used to supply water in urban boiler houses or supply heating to a house. Seamless pipes are a type of rolled metal, the production technology of which provides for the absence of any seams along the entire length of the products. The weakest point of a welded pipe is the seam. Despite the constant improvement of technologies, due to additional heating during welding, the metal structure along the joint becomes brittle, and the weld itself has a looser molecular structure, subject to corrosion destruction. Steel seamless pipes do not have such a flaw; a monolithic cylindrical shape serves as a reliable protection against leaks. The main purpose of a seamless pipe is high-pressure pipelines or the transport of hazardous substances in industrial facilities. When a leak or rupture could threaten the safety of life or the environment. In domestic engineering networks, there are no loads that a straight-seam pipe could not withstand, however, the absence of a seam increases the service life, durability and reliability, for example, of gas equipment in a private house. Seamless pipes can be bent without loss of quality, so they are used for the manufacture of coils, spirals and bent bends. Applications of seamless steel pipes: High pressure gas and oil pipelines; Chemical pipelines for transportation of solutions of acids, alkalis, toxic gases; Coils and spirals of industrial heat exchangers, water heaters; Systems with closed circuits; Extraction of gases and combustion products from blast furnaces; Details of piston mechanisms; Pipeline accessories; Foundation piles for power transmission lines and other metal structures. The main advantage of a seamless body is tightness, resistance to tearing and corrosion, since all adverse factors associated with a welded joint are excluded: residual stresses, microheterogeneity, sagging, loss of elasticity. Classification of seamless pipes Products are made of carbon and alloy steels, especially stainless steels. Manufacturers use two methods: Cold-rolled GOST 8733-74; Hot-rolled GOST 32528-2013 (GOST 8734-75 is valid with clarifications). Hot-rolled pipes are obtained from hot cylindrical billets; heating modes from 900 to 1270 Co are used for different steels. During hot rolling, the structure of the metal retains its elasticity, compacts, but it is impossible to obtain a thin-walled material. The cold method includes several stabilizing annealings, during which the metal grain is ground, and residual stresses are removed, the structure becomes homogeneous and strong. The deformation is carried out in a cooled state, but the metal in the rolling machine is very hot due to