Lviv circle calibrated steel 6-350 mm st20, st45, 40X, R6M5, 20X13, 08X18H10T (Metallobaza).
Manufacturing technology
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.
Where products are applied
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 areas:
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.
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". However, in any case, standards require that products be protected against corrosion by oil. An exception is made only for a circle made of stainless steel; it is also possible to do without oil by agreement with the customer.
Features of manufacturing and delivery
You can buy a calibrated circle of various sizes from steel of various grades. The diameter varies from 3 to 270 mm or more. With a size of up to 5 mm (and upon agreement with the customer - up to 25 and even more), the circle can be supplied in coils. If the diameter exceeds this figure, then it is customary to manufacture rolled products in bars of measured and random lengths.
The bars are supplied bundled, each bundle must be marked. In particular, the diameter of the bar, steel grade, type of manufacturing accuracy (high, increased, ordinary accuracy) are indicated.
The length of the bars can be from 1.5 to 6.5 m, depending on the type of steel. If necessary, you can buy a calibrated circle, cut into pieces of the desired length. It is worth remembering that the state standard assumes the absence of burrs and bends.
If the process requires the use of special steel grades and non-standard types of anti-corrosion lubricant, then this should be discussed with the supplier at the order stage.
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:
The resulting calibrated circle momay be subjected to secondary 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 areas:
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.
The calibrated wheel is obtained according to the GOST 7417-75 standard, which provides for the following features:
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 manufactured products have the following technical features:
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.
The calibrated circle is one of the varieties of rolled metal products. It is made in the form of a rod with different diameters and lengths, and has a circle in the transverse section.
Today, on the market, such a type of rolled metal product as a calibrated circle is very common. In the manufacture of hot-rolled circles, alloy steel, low-alloy, carbon and high-carbon steel can be used, which determines its main technical characteristics.
The circle calibrated is generally used in mechanical engineering, in an agricultural branch, and in all adjacent branches of mechanical processing and construction.
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 manufactured products have 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. The calibrated circle is one of the types of rolled steel. For its manufacture, only the highest quality carbon steel is used, which is smelted in a special way. For additional processing, cold drawing is used. As a result of this approach, the physical, plastic, and also mechanical properties of steel increase. In addition, the surface characteristics are improved. Depending on the purpose, a calibrated metal circle can be subjected to additional surface treatment, which results in a polished or matte finish. A stainless product has a first class of degree of curvature, as well as a second class. The steel calibrated circle is issued with the average, increased and high accuracy of processing. For their marking, the letters A, B and C are used, respectively. The circle calibrated according to standards of GOST 7417-75 is issued. It regulates the production of products, the circle diameter of which is from 3 to 100 mm. Circles up to 5 mm are produced, as a rule, in coils. If the diameter is more than 5 mm, the products look like bars. For a calibrated circle, maximum deviations for the diameter h11 are allowed. Manufacturers at willCossacks can make a circle with a diameter of 25 mm in the form of coils. In addition, the buyer can order a calibrated wheel with heat treatment. Calibrated circles are divided by length into: - products of measured length; - products of unmeasured length. For the production of these metal products, different grades of steel are used, for example: 40, 40x, 45, 10, 20, 35. A circle calibrated in the form of bars from 2 to 6.5 meters long is made from alloyed, low-alloyed, automatic and high-quality carbon steel. High alloy steel is used for bar lengths from 1.5 to 6.5 meters. And with a random length (not less than 1.5 m), high-quality carbon steel, alloyed and automatic, is used. Calibrated circles of greater length are made by special order. A calibrated circle has found its application in various fields. The steel product is mainly used for reinforcing reinforced concrete. A calibrated circle made of low-alloy steel, due to its resistance to adverse conditions, has become indispensable in the northern latitudes during construction. Also, in some cases, it is used for grounding gas pipelines. Stainless steel bars, round sections (calibrated circles) are used in the automotive, aviation, shipbuilding, woodworking, food, and pharmaceutical industries. Also, calibrated circles have won their place in design and outdoor advertising. In addition, they are used for interior processing of premises. Due to its high strength and wear resistance, the calibrated stainless wheel is perfect for the production of a wide variety of parts that will be operated under conditions of high loads and high temperatures. Stainless steel is an excellent material for the manufacture of grinding balls, the production of pipes, the design of various spare parts and fasteners. The bars are supplied bundled, each bundle must be marked. In particular, the diameter of the bar, steel grade, type of manufacturing accuracy (high, increased, ordinary accuracy) are indicated.
The length of the bars can be from 1.5 to 6.5 m, depending on the type of steel. If necessary, you can buy a calibrated circle, cut into pieces of the desired length. It is worth remembering that the state standard assumes the absence of burrs and bends.
If the process requires the use of special steel grades and non-standard types of anti-corrosion lubricant, then this should be discussed with the supplier at the order stage. Among all types of rolled metal, the steel circle occupies an important place. After all, its range of use is very wide and varied:
Hot-rolled steel circle is often used as reinforcement when pouring concrete structures. Its use in this area is due to the presence of almost all the qualities inherent in conventional fittings of the same diameter.
Hot rolled circle is used to strengthen various metal structures in various fields of activity: automotive, heavy industry and mechanical engineering.
Steel circle plays the role of raw material for the manufacture of products of other types of sectional shaped steel: springs, bolts, axles, etc.
It is used for the production of various parts using special machines.
It is used as a blank for the production of steel pipes or products with high precision turning parts. The main distinguishing feature of calibrated rolled metal products from hot-rolled products is their production technology. In order to obtain high-quality calibrated products, hot-rolled metal parts are drawn through a drawing hole specially designed for them, the diameter of which is slightly smaller than the original size of the product. Thus, a billet is obtained that has a higher density than a hot-rolled product.
In addition to manufacturing technology, calibrated rolled metal has other features:
the minimum diameter of the calibrated product must be 30 cm
if steel bars are calibrated, then their length should be within 6-15 m
You can calibrate rolled metal products of any shape: round, square, hexagonal, etc.
if it is necessary to calibrate low-plastic products, hot drawing technology is used, that is, the products are heated to a temperature of 100ºC
A significant disadvantage of calibrated products is that they are subjected to significant distortion during the calibration process. To eliminate this shortcoming, it is necessary to use high-precision machines that allow you to quickly align all products.
If high-alloy steel is subjected to calibration, then the final stage of its manufacture is grinding.
