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

Seamless metal pipe: types, characteristics and applications Content: Despite the active introduction of pipes made of macromolecular compounds, or polymers, into all areas of industry, seamless steel pipes continue to remain popular, and in some areas of human activity they are completely irreplaceable. For example, when assembling water supply circuits in production, only such products are still used. This article is about the types of seamless pipes and their characteristics. Types of steel pipes It is possible to classify metal pipes - seamless or with a seam - according to many different parameters. For example, according to the method of manufacturing pipes are divided into: spiral-seam electrowelded; longitudinal electric welded; seamless cold deformation; seamless hot-formed pipes. Seamless pipe Seamless steel pipes are used in conditions requiring reliability and increased strength characteristics: in industrial and municipal pipeline systems with high pressure and temperature, for transporting liquid and gaseous media, as well as in construction as structural elements. Seamless steel pipes differ in the production method: hot-worked; cold-formed. The initial stages of manufacturing hot-formed and cold-formed steel pipes are the same (obtaining a sleeve from a billet by extrusion or on a piercing mill). Then, blanks for cold-formed pipes are cooled before further processing (unlike hot-formed ones), and subsequent additional technological operations allow you to adjust individual parameters: increase heat resistance, mechanical strength, and surface treatment accuracy class. Hot-formed seamless steel pipes for general purposes from carbon and alloy steels Nominal dimensions, weight of one meter and accuracy class for maximum deviations for hot-formed steel pipes from carbon and alloy steels are established by the assortment GOCT 8732-78. The technical conditions of production are regulated by GOCT 8731-74, the requirements for marking, acceptance and logistics are determined by GOCT 10692-80. Specifications according to GOCT 8731-74 Hot-formed pipes, depending on the performance requirements, are produced in five groups: for pipes of group A, made of carbon steels according to GOCT-380, mechanical characteristics are normalized; for pipes of group B from steels according to GOCT 380, 1050, 4543, 19281, the chemical composition is regulated; for pipes of group C (steel according to the same GOCT as for class B), the chemical composition and mechanical characteristics are regulated; for group G pipes made of steels according to GOCT 1050, 4543, 19281, the chemical composition is regulated and the control of mechanical characteristics is established; group D - the value of the test hydraulic pressure is normalized, mechanical properties and chemical composition are not regulated. Assortment, accuracy class and weight of hot-formed seamless pipes according to GOCT 8732-78 The GOCT 8732-78 range sets the following dimensional limits: minimum outer diameter 20 mm, minimum wall thickness 1.08 mm; maximum outer diameter 550 mm, maximum wall thickness 75 mm. Steel pipes have many varieties, each of which is suitable for solving a certain range of tasks. The scope of pipes very often depends on their dimensions, which, in turn, are regulated by the relevant standards. About the standards governing the sizes of steel pipes and their scope, and will be discussed in this article. The main scope of longitudinally welded pipes is process pipelines designed for medium internal pressure, but if necessary, they are quite suitable for the installation of metal structures. The standard of steel pipes created by this method is defined as follows: Technological features of the production of longitudinally welded pipes are regulated by GOST 10704-91; According to the standard, the outer diameter of this type of pipe can vary from 10 to 1420 mm, and the wall thickness can vary from 1 to 32 mm; Products with a diameter of up to 426 mm can be produced both in measured and non-dimensional formats, and the length of a steel pipe of a larger diameter can only be random; In addition to conventional pipes, products with a reinforced weld can also be created in production, but in this case, GOST 10706 will regulate the production process and the dimensions of the pipes. The fundamental difference between such pipes and straight-seam pipes is that the production process includes pre-rolling the workpiece into a spiral shape before welding. Due to this factor, somewhat higher pressures are achieved that such a pipe can withstand. The standard states in a separate paragraph that its effect does not apply to pipes for main gas and oil pipelines. In practice, this rule only affects the