Background

It is believed that copper has been mined for over 5000 years. It can be found in elemental form and in the minerals cuprite, malachite, azurite, chalcopyrite and bornite. Copper is also often found as a by-product of silver production. Basic Copper Properties Next to silver, copper is the next best conductor. It is a yellowish red metal that polishes to a bright metallic lustre. It is tough, ductile and malleable. Copper has a disagreeable taste and a peculiar smell. Copper is resistant to corrosion in most atmospheres including marine and industrial environments. It is corroded by oxidising acids, halogens, sulphides and ammonia based solutions. Alloy C106 C106 is phosphorous de-oxidised non-arsenical copper that is 99.85% pure.

Chemical Composition

Table 1. Typical chemical composition for copper alloy C106 % C106 Cu 99.85 min Pb - Sn - Fe - Al - Mn - Zn - Si - Ni - P 0.015-0.04

Properties

Mechanical Properties Table 2. Typical mechanical properties for copper alloy C106 Grade C106 Tensile Strength (MPa) 220 Proof Stress 0.2% (MPa) 45 Elongation A5 (%) 45 Hardness VPN 45-60 Physical Properties Table 3. Typical physical properties for copper alloy C106 Property Value Density 8.94 g/cm3 Melting Point 1083°C Modulus of Elasticity GPa Electrical Resistivity 0.0203x10-6 Ω.m Thermal Conductivity 339.2 W/m.K at 100°C Thermal Expansion 16.9x10-6 /K at 100°C Alloy Designations Phosphorous de-oxidised non-arsenical copper corresponds to the following standard designations and specifications: CEN BS UNS ISO CW024A C106 C12200 Cu-DHP Corrosion Resistance Corrosion resistance is either good or excellent in most environments and atmospheres other than those containing ammonia ions. Fabrication Cold Working C106 has an excellent response to cold working. Hot Working With forging of brass rated as 100, the hot forgeability of C106 is rated at 65. Hot working temperatures should be between 760 and 870°C Heat Treatment Solution treatment or annealing can be done by rapid cooling after heating to 370-650°C. Machinability This alloy has a machinability rating of 20 when Alloy 360 FC Brass is 100. Welding Deoxidation of C106 improves embrittlement resistance during welding. Brazing and soldering are both excellent joining methods for C106. Gas shielded arc welding is also excellent. Oxyacetylene welding and butt welding are good. Welding methods not recommended include: · Coated metal arc welding · Spot welding · Seam welding Applications C106 is typically used in applications like: · Refrigeration · Gutters and roofing · Gas plants · Busbars · Hydraulic, air and oil lines · Air Conditioning and refrigeration · Heater units and burners tubes Consumer · Plumbing pipe and fittings