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

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 metal pipe: types, characteristics and applications The wall thickness of products can also vary, respectively, they distinguish: For example, with a diameter of up to 20 mm, a thin-walled pipe is a product with a wall thickness of not more than 1.5 mm. In the case when this parameter does not exceed 0.5 mm, the pipe is called especially thin-walled. The surface of the products can be coated with a corrosion-preventing coating. In most cases, zinc is used for this, although other options are possible, such as chromium plating. Seamless metal pipe: types, characteristics and applications It is possible to apply protective material to all pipes, regardless of the dimensions, wall thickness, geometry and methods by which the products were manufactured. It is obligatory, according to GOST, to apply such a coating to longitudinally welded pipes and products for water and gas pipelines. The procedure for the manufacture of steel pipes In the case of the production of welded pipes, the starting material is a steel sheet, which is suitably shaped and subjected to electric current welding. Seamless cold- and hot-formed pipes are made from steel billets called rods. Seamless metal pipe: types, characteristics and applications Algorithm for the production of seamless steel pipe d d: The pre-prepared rod is loaded into an oven where it is heated to a temperature slightly above the material's recrystallization threshold. At this value, the steel becomes quite ductile, but does not melt yet. The red-hot product is placed on a piercing press, where it is shaped into a cylinder empty from the inside - the so-called sleeve. After that, the stage of hot deformation begins directly, which takes place under the influence of rollers, which give the previously manufactured sleeve the specified values of the diameter and wall thickness. After forming, the pipe is cooled and calibrated on the last row of rollers. Finished products are cut into sections of the required length and sent to the warehouse. Seamless metal pipe: types, characteristics and applications The procedure for the production of cold-formed products: Get the sleeve in the same way as in the previous case. The workpiece is cooled below the recrystallization temperature, all operations for processing the sleeve are carried out at these heating values. The future pipe is processed by rollers. Before calibration, the product is annealed, during which it is heated to the recrystallization temperature and left to cool naturally. Thus, the internal stresses of the pipe, which threaten the strength of the finished product, are eliminated, and plasticity and the necessary viscosity are imparted to it. The finished pipe is cut and transported to the warehouse. 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. There is another important point regarding steel pipes - a straight seam can be created using argon arc welding or induction welding. In the first case, a more reliable connection is obtained, but the second method is much cheaper and faster. 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 affects only the assortment - received