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Bronze

Bronze

BronzeBronze - binary and multicomponent copper alloys with many alloying elements, except zinc. Copper-nickel alloys in a separate group of materials.

There are two groups of bronze - tin bronze (main alloying element is tin) and non-tin (special).

By technology, bronze divided on deformed and casted. First easy to stamping, forging, corrugated and other kinds of processing pressure used in the manufacture of products. Casting bronze intended for shaped castings. Bronze over brass have higher strength, corrosion resistance and anti-friction properties. They are very persistent in air, sea water, soluble in most organic acids, carbonic acid solution.

Alloying element in bronze - tin, aluminum, nickel, manganese, iron, silicon, lead, phosphorus, beryllium, chromium, zirconium and other elements. By low-temperature annealing (250-300 °C) may be increased its elastic properties and hardening.

Tin, aluminum, nickel and silicon increases strength, elastic properties and corrosion resistance of bronze. Other elements (lead, phosphorus, zinc) increases anti-friction properties.

Iron and nickel strongly milled grain and increase the recrystallization temperature of bronze. Manganese and silicon increase heat resistance. Beryllium, chromium, zirconium, especially after quenching and aging, improve the strength properties of alloys, while significantly reducing electrical conductivity. These elements greatly enhance the heat resistance of bronze. Bronze (except aluminum bronze) well welding brazing and soldering.

Non-tin bronze properties are not inferior, and in some cases superior to tin bronze, and therefore it is widely used in engineering and other industries. Bronze is used to make fittings, all kinds of gears, bearings, bushings, tanks, reservoirs and other critical parts and components of machines and devices.

Bronze alloy properties determined by the content of alloying elements..

Beryllium bronze - the most durable copper-based alloy. In its hardness and elastic properties at normal temperature, it is superior quality steel. The special position occupied by chromium and cadmium-containing bronze, which are the most highly conductive and thermal conductivity bronze.

In engineering used bronze flat and round bars. Flat products are delivered in a soft (annealed or tempered), semi-solid, hard and high solid state.

Application

Bronze alloy of copper and tinBronze - an alloy of copper and tin has been known since ancient times. This is strong, nice and flexible material was used by ancestors to make metal tools, weapons, jewelry and utensils. In Bronze Age, along with the metal copper was valued at least gold and silver. Modern bronze alloys - high-tech materials that doped with zinc, nickel, Aluminum, beryllium, phosphorus, silicon. In result we receive a metal with different physical and chemical properties that can be used widely as an effective bronze material for industrial and artistic production.

The application of tin bronze depending on the type of alloy, which have two options - wrought and cast.

Wrought bronze generally used for the manufacture of a wide class of springs, bearings, bushings, couplings and other components that require the presence of high anti-friction properties. Casting bronze alloy is ideally suited for the production of valves, bearings, gears, and other critical parts, operation requiring durability and longevity.

New technologies have begun production of a wide range non-tin bronze alloys, where instead of tin as the principal alloying element used other chemical elements - Aluminum, manganese, nickel, iron and lead. Result - advanced solutions feature high bronze corrosion resistance and density, which allows to use these alloys for the following tasks:

  • manufacturing bronze - sheet, wire, rod and tube;
  • production of components for the manufacture of chemical equipment;
  • manufacturing control valves for pipes and heating systems;
  • Production of elite jewelry and plumbing;
  • prestigious interior decoration.

Impurity of beryllium in bronze alloy improves weldability and increased mechanical properties of the metal.

Despite its relatively high cost, bronze every year have a growing demand in the various projects and manufacturing. The distinctive appearance of bronze successfully completed high specification - plastic ductility, corrosion resistance, wear resistance. Long service life of bronze today is not questioned. The return pipe fitted with a bronze in the critical areas of pipes and other fittings characterized by the highest rates. Thus, the production of bronze will develop in the future, offering the consumer more and more high end properties of this remarkable non-ferrous alloys.

Grade list

Tin bronze grade list
GradeChemical composition
GOST Analogue Tin Phosphorus Zink Nickel Plumbum Copper
БрОФ8,0–0,3 - 7,5–8,5 0,26–0,35 - 0,10-0,20 - rest
БрОФ7– 0,2 CuSn 8 7,0–8,0 0,10–0,25 - - - rest
БрОФ6,5–0,4 - 6,0–7,0 0,26–0,40 - - - rest
БрОФ6,5–0,15 CuSn 6 6,0–7,0 0,40–0,25 - 0,10–0,20 - rest
БрОФ4–0,25 CnSn 4 3,5–4,0 0,20– 0,30 - - - rest
БрОФ2–0,25 CuSn 2 3,0–5,0 0,02–0,3 - - - rest
БрОЦ4–3 CuSn 4Zn 3 3,5–4,0 - 2,7–3,3 - - rest
БрОЦС4–4–2,5 CuSn 4Zn 4Pb 3 3,0–5,0 - 3,0–5,0 - 1,5-3,5 rest
БрОЦС4–1–1 CuSn 4Zn 4Pb 4 3,0–5,0 - 3,0–5,0 - 3,5-4,5 rest


Chemical composition of non-tin bronze
Grade Аl Be Fe Мn Ni Si Ti
БрА5 4–6
БрА7 6–8
БрАМц9-2 8–10 1,5–2,5
БрАМц10-2 9–11 1,5–2,5
БрАЖ9-4 8–10 2–4
БрАЖМц10-3-1,5 9-11 2–4 1–2
БрАЖН10-4-4 9,5–11 3,5–5,5 3,5–5,5
БрБ2 1,8–2,1 0,2-0,5
БрБНТ1,7 1,60–1,85 0,2–0,4 0,1–0,25
БрБНТ1,9 1,85–2,10 0,2–0,4 0,10–0,25
БрКН1-3 0,1–0,4 2,4-3,4 0,6-1,1
БрКМцЗ-1 1–1,5 2,75-3,5
БрМц5 4,5–5,5

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