Nikolaev bronze circle (blank, rod) BrOTsS555, BrAZh9-4, BrOF, rolled and cast bronze on order, bronze bushings
Bronze circles BrAZh9-4 have increased anti-friction parameters and withstand prolonged friction. At the same time, their integrity is preserved. Bronze circles of this type are made from a copper alloy containing iron impurities (2 - 4%) and aluminum additives. The rest of the alloy is copper with a small proportion of impurities. Used in the manufacture of nuts, bearings, valves, which are used in the assembly of important components of cranes, crushers, elevators, machine tools. Since there is no expensive tin in BrAZh9-4, this brand of bronze is inexpensive and affordable. At the same time, it retains its high quality characteristics: it is resistant to corrosion and friction, well forged and pressed.
Bronze circle
A circle of bronze is a metal bar with a circular cross section, the same along its entire length, the raw material for the production of which is tin or tinless bronze.
GOST 6511-60 bronze circle
The composition of the raw materials, the method of production, the condition - everything matters in the formation of the spectrum of properties of the finished bronze circle. Each of these parameters is regulated by a certain quality standard. Currently, there are several regulatory documents for different product categories:
GOST 1628-78 describes the characteristics of products from various grades of tinless bronze, for example, BrAZh9-4 or BrAMts9-2, etc.
GOST 10025-78 defines the quality standards for goods made of bronze alloys BrOF7-0.2 or BrOF10-1.
GOST 6511-60 regulates the production of circles made of tin-zinc bronze BrOTs4-3, BrOTsS5-5-5.
GOST 15835-70 controls the production and quality of bronze products from the BrB2 alloy.
In addition to the listed quality standards, the production of bronze circles can be controlled by the requirements of other regulatory documents, for example, TU 48-21-408-86. The specified text establishes the technical parameters of products made of BrKh1 chromium bronze used for the production of welding electrodes.
Characteristics of the bronze circle
Despite the differences in the provisions of quality standards, all bronze circles have similar operational properties that distinguish them among similar products of a different material design:
Corrosion resistance (higher than brass);
Strength;
High anti-friction level;
Resistance to aggressive substances;
Good weldability;
Low thermal conductivity.
Depending on the amount of alloying additives, the color of bronze circles can vary from white to red. Each component of the raw material added to the main composition gives the final product certain qualities. For example, tin, silicon, aluminum, nickel increase strength and resistance to the development of corrosion processes. Phosphorus, zinc and lead in combination determine the anti-friction performance of products. The heat resistance of circles depends on silicon and manganese. The heat resistance is also influenced by chromium, beryllium and zirconium. However, the last of the elements mentioned significantly reduce the electrical conductivity of the rods.
Quality products sold from the warehouses of suppliers are accompanied by certificates of an approved image, indicating the appropriate performance of the goods.
The use of a bronze circle (bar)
Bronze circles are used in various fields: space and electrical industries, automotive, shipbuilding, aviation, instrument making. Products from bronze circles serve to extinguish friction, extend the life of expensive equipment, and facilitate the operation of mechanisms. The bronze circle has a number of valuable qualities: low cost, resistance to friction, anti-corrosion properties. Therefore, it is simply indispensable in the auto-tractor, machine-building and railway fields.
The bronze circle acts as a blank for some parts of the engine - valves, shafts; as well as for various fasteners - screws, bolts, nuts. It is widely used in the oil and gas industry, in particular in the production of supports on which the drilling rig slides, as well as in the production of crushers, elevators and fittings. The bar is very popular among sculptors and masters of arts and crafts.
Classification and characteristics of bronze bars (circles)
Chemical composition and brands:
• Tin bronzes. Correspond to GOST 5017-74, processed by pressure.
• Tinless bronzes. Processed by pressure. Manufactured in accordance with GOST 18175-78.
According to GOST 24231-80, preparation and sampling takes place in order to determine the chemical composition of metals.
Method for the production of bronze circles (GOST 1628-78):
• G - rolled;
• D - drawn or cold-formed;
• P - pressed or hot-formed.
Manufacturing accuracy: H - high, N - normal, P - increased.
Bronze condition:
• M - soft;
• T - solid;
• P - semi-solid;
• O - especially hard.
Bronze Lengthabout rod:
• in bays - BT;
• measured length - MD;
• unmeasured length - ND;
• multiple measured length - CD.
Special conditions for the production of bronze circles:
MP - measuring rods made of bronze with increased length accuracy;
AB - bronze circles, subsequently processed on automatic machines.
The main characteristics of a bronze circle are ductility, flexibility, malleability and good strength. These properties make it possible to widely use the rod in industry as a semi-finished raw material.
Bronze bars are produced at low cost. Products from them serve for a long time. The bronze circle has a high thermal conductivity and is well welded. It is not afraid of corrosion and is easy to machine. It can be cut, drilled, milled. After processing on a lathe or milling machine, the surface of the bar becomes smooth.
Due to its versatility, the bronze circle is also in demand in other areas of human activity. In addition to the automotive sector, it is used in the production of tractors, road construction, in the railway and military industries. Of course, the scope of this product is very wide.
Bronze circles are indispensable for the creation of elevators and crushers, pressing equipment and machine tools, mechanisms and many industrial devices. Attractive appearance contributed to the fact that this metal-rolled product became in demand in arts and crafts. It is also used by some contemporary sculptors.
In addition to all of the above, the bronze circle is a suitable raw material for the manufacture of various mechanisms and assemblies. Thus, the product can rightfully be called universal.
Advantages and features of the bronze circle
The bronze circle is used in such a variety of areas due to its excellent quality characteristics. So, the material is characterized by increased elasticity, good ability to resist friction. A circle made of bronze can withstand very high loads.
For the production of this product in factories, various methods are used: cold-formed, rolled and pressed. Bronze circles are made from semi-solid or solid materials in accordance with GOST.
Summing up all of the above, we come to the conclusion that it is the valuable properties and excellent performance of the bronze circle that made it in demand in many branches of production and industry.
Features of the production of a bronze circle
Rolled round bronze is produced on special machines in three main ways:
rolling (G);
cold broach (D);
pressing or hot deformation (P).
A bar and a circle of varying degrees of accuracy come out of the metallurgical equipment, denoted by the letters B, H and P, which determine the levels, respectively, high, normal and increased.
Different grades of bronze differ in hardness. In order not to delve into the chemical composition, letter indices are used in the marking to refer the alloy to different strength groups:
M - soft;
P - semi-solid;
T - solid;
Oh, very hard.
Also, by marking the bronze circle, you can determine the type of delivery. If the article contains the letters BT, then the circle and the bar are supplied in coils, MD - in cuts of measured length, ND - in fragments of random length, KD - multiple measured length.
If the letters MP are found in the marking, it is easy to determine that the length of the rolled product is characterized by increased accuracy, and the combination AB shows a bar additionally processed on automatic equipment.
The general qualities of bronze, characteristic of all brands of bronze: flexibility, ductility, malleability, corrosion resistance. The production cost of bronze is lower than that of other alloys, which determines its availability, and its chemical and physical properties - demand. The bar and circle are well processed, easily welded, drilled, milled, polished and ground.
You can determine the properties of the bronze circle by marking. The first two letters "Br" show that this is exactly bronze. Next come the letter designations of the alloy components in descending order of percentage. For example, Br. OTsS4−4-2.5 contains tin, zinc and lead in the amount of 4, 4 and 2.5%, respectively. Also in the alloy is copper, but its content is implied by default.
Separate grades of rolled bronze
Rolled products from the BrAZh9−4 alloy are characterized by increased antifriction characteristics and resistance to abrasion loads. The composition of bronze includes aluminum and iron, which is easy to determine by marking. Copper used in smelting is pre-cleaned and contains virtually no impurities. This alloy is used for the production of bearings, hardware, valves, important components of crane and elevator equipment. The alloy is resistant to corrosion, has high malleability and toughness, which makes it possible to manufacture parts by pressing.
Rent BrB2
The composition of the alloy contains 2% beryllium and tin is completely absent. The bronze circle is characterized by resistance to chemicals, sea water, has heat resistance withinlah -200…+ 200оС. The alloy is elastic, suitable for the manufacture of springs operating in a wide temperature range.
Alloy BrKMts
Bronze contains silicon and manganese. Bronze is distinguished by high elasticity and weldability, resistance to external loads. A feature of the alloy is the absence of sparking during impacts. This allows the use of bronze of this brand in devices and equipment used in an explosive atmosphere. A circle of bronze BrKMts is used for the production of springs and other parts for the chemical and engineering industries, and is used in shipbuilding.
Bar BrOF
Tin - phosphor bronze has anti-corrosion properties, high resistance to friction, strength under static and dynamic loads. It is well processed both in a cold state, and when heated. It is used for the manufacture of parts of complex configuration for rotation units.
Bramts circle
Designers and engineers are attracted by the chemical resistance of the alloy - parts made of BrOF can be used in almost any aggressive environment. It is mainly used for the manufacture of bushings and bearings.
Bar BrOTsS
The content of tin, zinc and lead determines the characteristic properties that make it possible to produce a circle only by casting. The alloy is characterized by low ductility, poorly elongated. The softness of BrOTsS makes it easy to cut rolled products into a semi-finished product of the desired length. The low coefficient of friction and resistance to abrasion have determined the scope of the alloy for the production of bushings and bearings.
Round bars BrAZhMts
The scope of use of an alloy with a high content of aluminum, iron and manganese is taps, valves and other valves in oil and gas pipelines. Bronze brand BrAZhMts has increased strength, wear resistance and chemical inertness.
