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Aluminium Bronzes

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Aluminium Bronzes are alloys, predominantly of Copper ranging from 77% to 93% and Aluminium from 6% to 12% together with smaller amounts of Iron, Nickel, Manganese and Silicon which promote the specific properties that engineers and metallurgists can exploit.

There are three major types of Aluminium Bronze. Binary Aluminium Bronze (Copper Aluminium), complex Nickel Aluminium Bronze (Copper, Aluminium, Nickel, Iron) and Silicon Aluminium Bronze (Copper, Aluminium, Silicon).

Given the inherent corrosion resistance of Copper, the addition of Aluminium improves the strength and corrosion resistance, Nickel further improves the corrosion resistance and raises the proof stress. Manganese stabilises the metallurgical Beta phase and improves the tensile strength. Iron refines the grain size, again improving the strength. Silicon improves the ductility, hot workability and machinability of the alloy and enhances its corrosion resistance.

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Special High Tensile Brasses & Bronzes

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This family of alloys contains various alloying elements in addition to the main constituents of Copper and Zinc. The elements are added to promote a wide variety of properties to aid the engineer in selecting the correct alloy for specific applications.

Several alloys have been designed for their bearing properties. The presence of Silicon in a controlled ratio with Manganese helps in the formation of very hard intermetallic compounds. By controlling the manufacturing method the intermetallic Silicides can appear in globular form or in elongated needles with a hardness ranging from 700-1000 VPN, set in softer matrix of 150 VPN. This combination results in an alloy with excellent wear resistance and bearing properties coupled with a low coefficient of friction. These properties make them suitable for use in the automobile industry for valve guides, gearbox baulk rings, brake parts, in hydraulic piston pumps and for security lock part components.

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Cast and Wrought Leaded & Phosphor Bronzes

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In addition to our comprehensive range of extruded, rolled and forged Copper alloys, we offer continuously cast Aluminium Bronzes, Phosphor Bronzes and Gun Metals. These are produced from our modern casting unit which incorporates the latest electronic control techniques. All the alloys in the range have an excellent homogenous structure and require minimal machining to give a bright, clean surface free from imperfections.

Phosphor Bronzes are an excellent choice when good bearing and low wear characteristics are required, this range of Copper/Tin alloys have stood the test of time. These alloys can be cold worked to impart additional strength without loss of bearing characteristics resulting in a range of useful engineering materials. The high Copper content coupled with Tin and the tight control of impurities, ensures that the Phosphor Bronzes have excellent corrosion resistance.

For general engineering purposes where the requirements are for corrosion resistance, coupled with reasonable bearing characteristics at a lower cost, the Gun Metals are eminently suitable. With Copper once again as the dominant element, varying additions of Tin, Zinc and Lead improve the machinability, strength and bearing properties.

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Special Alloys

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High strength Cupro-Nickel alloys have been developed for marine applications where both a combination of strength, toughness and corrosion resistance is needed. These alloy types are widely used for high integrity components for marine service including stampings, forgings, fasteners and machined components. Our X180 alloy, as an example, also offers excellent resistance to galling.

Silicon Iron Bronze alloys are typically used for anti-friction bearing cases.

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