Brovary circle calibrated steel 6-350 mm st20, st45, 40X, R6M5, 20X13, 08X18H10T (Metallobaza)

Brovary circle calibrated steel 6-350 mm st20, st45, 40X, R6M5, 20X13, 08X18H10T (Metallobaza)

The calibrated circle is a kind of rolled steel and is a round bar. For the manufacture of such material, the technology of cold drawing with the use of hot-rolled raw materials is used. Outwardly, the products are very similar to steel bars, but they are distinguished by evenness and accuracy. A calibrated circle serves as a workpiece from which various parts for mechanisms, bolted joints, studs, shafts, etc. are made. That is why strict accuracy requirements are imposed on such a material. The main feature of the calibrated wheel is high geometric accuracy, as well as improved surface quality and strength. Rolled products can be produced in one of two ways: cold rolling method - consists in passing the workpiece through the rolls of the roughing and finishing stands, which helps to reduce the cross section. A similar technology is used for the production of hot-rolled circles, the only difference is that the rolled products are not preheated; drawing a hot-rolled bar through a die having a smaller cross section than the billet. This method is also called drawing. The resulting calibrated wheel can be subjected to auxiliary processing, including polishing and grinding in order to reduce the level of roughness and improve accuracy. The most popular is the method of manufacturing a calibrated circle by drawing, which makes it possible to obtain the most accurate dimensions with giving the surface special properties. The rods obtained using this technology have strength and elasticity and are used in the following areas and fields: Oil refining and gas industry. Machine-building. Machine tool. Construction of fences and gates. The reasons for the popularity of products are related to the fact that they do not need additional machining. This reduces the financial cost of using processing equipment. Thanks to a special technology, the output is high-precision products that are devoid of all types of flaws on the surface. The advantage of calibrated steel is its long service life. The positive technical properties of this material make it possible to use it in various fields and industries, and even in aggressive conditions. Specifications The calibrated wheel is obtained according to the GOST 7417-75 standard, which provides for the following features: production of rolled products with three types of surface quality - A, B and C (medium, high and increased accuracy); four varieties of quality: h9, h10, h11 and h. Production is carried out using various grades of steel. For this, alloyed, low-alloyed, as well as carbon and high-carbon steels are used. The length of the bars varies from 1.5 to 6.5 meters, and if it is necessary to obtain large-sized blanks, their production is carried out by special order. The product has the following technical features: Round section in the form of bars. The cut is made at a right angle. Section diameter — from 5 to 100 mm. According to GOST 7417-75, only a slight deviation is allowed in the range from 0.1 to 0.3 mm. Production material - different grades of steel, which are resistant to corrosion, temperature extremes and mechanical stress. Delivery of calibrated wheels is carried out in bays, if their cross section does not exceed 25 mm. If the rental is more than this value, then it is delivered in measured or random length. The blanks are marked with a diameter, the grade of steel used and the type of strength. Wear resistance determines the possibility of using rolled products to obtain various parts operated under conditions of increased loads. The cost of production is influenced by such factors as steel grade, rolling accuracy, quality, diameter and length. Outwardly, a calibrated circle is similar to an ordinary steel bar, only more even, accurate. In fact, he is what he is - a calibrated round bar. A simple bar, even made according to state standards, allows quite significant deviations in geometry, in surface accuracy. Accordingly, it is less demanding in terms of packaging, storage, and transportation. The circle calibrated is used as preparation for details of mechanisms, for bolts, hairpins, shaft and other products. Therefore, the requirements for the accuracy of its execution are higher. It is made from the same hot-rolled bar by additional rolling or drawing. At the same time, special attention is paid to the quality of the geometry, the absence of deviations. The raw material can be both carbon and alloy steel, including stainless steel. The same requirements are imposed on the quality of raw materials as in the manufacture of conventional bars. In some cases, the surface of the circle is additionally polished, as a result, an almost mirror surface is obtained. This variety is popularly called "silver".