Background

Bronzes are copper-based alloys. Major alloying elements are often, but not always, zinc and tin. They offer a combination of properties such as high strength, hardness, corrosion resistance and wear resistance. Phosphor Bronzes Phosphor Bronzes are alloys of Copper and Tin. PB102 has good corrosion resistance and is known for its high fatigue strength. It also shows a good combination of strength and ductility. Alloy PB102 Bronze alloy PB102 is a Phosphor Bronze. Along with the very similar alloy C51800, PB102 is the most widely used of the wrought phosphor bronzes.

Chemical Composition

Table 1. Typical chemical composition for bronze alloy PB102 % PB102 Cu 95 Pb - Sn 5 Fe - Al - Mn - Zn - Si - Ni -

Properties

Mechanical Properties Table 2. Typical mechanical properties for bronze alloy PB102 Half Hard Properties PB102 Tensile Strength (MPa) 650 Proof Stress 0.2% (MPa) 560 Elongation A5 (%) 3 Hardness VPN 210-240 Physical Properties Table 3. Typical physical properties for bronze alloy PB102 Property Value Density 8.85 g/cm3 Melting Point 930°C Modulus of Elasticity 121 GPa Electrical Resistivity 0.096x10-6 Ω.m Thermal Conductivity 63 W/m.K at 20°C Alloy Designations Bronze alloy PB102 corresponds to the following designations: CEN BS UNS ISO CW451K PB102 C51000 CuSn5 Corrosion Resistance Alloy PB102 has good corrosion resistance, almost equivalent to that displayed by the Aluminium Bronzes. Fabrication Cold Working Cold working response of PB102 is excellent. Hot Working Hot formability of PB102 is poor. Heat Treatment Solution treatment or annealing of PB102 can be done by rapid cooling after heating to 500-700°C. Machinability The machinability rating of PB102 is rated as poor at 20 compared to Alloy 360 FC Brass which is rated as 100. Welding and Joining · Soldering, brazing and butt welding of PB102 are rated as “excellent”. · Oxyacetylene welding, seam welding and coated metal arc welding are rated as “fair”. · Spot welding and gas shielded arc welding are rated as “good”. Applications PB102 is typically used in: · Gears · Worm Gears · Bushes · Marine applications · Aircraft applications · Chemical applications · Springs