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
Supplied Form

PB102 is typically supplied by Aalco in the following form:

· Drawn round rod

· Plate

· Hard sheet