The various coppers within this group have differing degrees of purity and consequently exhibit different characteristics. For high conductivity requirements, such as electrical components, Oxygen-free Coppers are required. The extra purity enhances ductility and gives freedom from Hydrogen embrittlement or blistering during brazing operations.
Brasses are Copper based alloys with Zinc as the essential secondary ingredient. The addition of Zinc to Copper creates a lower cost alloy with superior cold working strength to Copper but at the expense of reduced conductivity. The degree of alloying gives a varying range of properties that include strength, hardness, thermal and electrical conductivity, corrosion resistance, machinability, ductility. The difference in alloying also creates a range of colours, ranging from red, yellow, gold, bronze, silver and brown. Consequently, making Brasses ideal for decorative applications. Additionally, Brasses are used by a wide range of applications including Precision Stamping and Processing. Thanks to antimicrobial properties they are highly beneficial in hospital environments and brewery facilities. An additional benefit of Brass is its recycling ability.
Phosphor Bronzes are Copper Tin alloys, often referred to as Phos Bronze or Tin Bronze. They contain up to 7% Tin and a small quantity of Phosphorus, which is a residual from the de-oxidation of the Copper melt before the addition of Tin. By increasing the Tin content, you can increase the corrosion resistance and improve the strength of the alloy. Additionally Phosphor Bronzes offers good wear resistance, thermal and electrical conductivity and can be significantly hardened by cold working to give excellent spring properties. This Alloy dates back over 4000 years, where it was found in weapons, armor, tools and decorative items such as jewellery. In modern manufacturing it has many applications, notably in the Marine, Chemical and Aerospace Sectors.
Unlike the name suggests, Nickel Silver alloys are a combination of Copper, Nickel and Zinc and actually contain no Silver. They take their name from their silvery appearance and their ability to be polished to a high lustre. The similarity in appearance to Silver, consequently resulted in Nickel Silvers being widely used for adding decorative finishes to products including jewellery, tableware and musical instruments. Their mechanical properties are somewhat similar to Brass Alloys, however the addition of Nickel provides a superior resistance to stress corrosion cracking and tarnishing. Modern manufacturing has grown to include telecommunications components and food manufacturing equipment in addition to their traditional applications.
The most important commercial Copper Alloys are those with the content ration 90/10 Copper Nickel and 70/30 Copper Nickel. Whilst 70/30 has greater salt water resistance and strength, 90/10 is more common as it is less expensive with overall good properties for a range of applications. Cupronickels have good formability and excellent resistance to sea water corrosion making them ideal for Marine and Offshore applications. One of the key High Copper Content Alloys we supply is Alloy 194. Alloy 194 has 2.3% iron with small additions of Phosphorus and Zinc, with excellent resistance to softening, being able to withstand 300°C plus, for a few minutes. This is particularly beneficial for leadframe applications.
Copper Beryllium Alloys are precipitation hardening alloys possessing remarkable strength, elasticity and fatigue resistance and good resistance to corrosion. This makes them ideal for a number of demanding industry sectors such as Petrochemical, Oil and Gas and Mining. The fatigue and elasticity of Beryllium Copper are useful in pressure responsive components such as spring applications. It is also increasingly machined into minaturised components, required by Electronics and Telecommunication manufacturing for everyday items such as mobiles, laptops and tablets. The principal compositions are consist of around 1.6% to 2.0% Beryllium, with a small addition of Cobalt to refine grain size. We can supply these alloys can in the following forms: