Copper and Copper Alloys | Phosphor & Leaded Bronze
CW451K Sheet and Bar
Bronzes are Copper-based alloys with the major alloying elementbeing Tin. They offer a combination of properties such as high strength, hardness, corrosion resistance and wear resistance.
Bronze alloy CW451K/PB102 is a Phosphor Bronze. 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.
Applications
CW451K/PB102 is typically used in:
~ Gears
~ Worm Gears
~ Bushes
~ Marine applications
~ Aircraft applications
~ Chemical applications
~ Springs
CW451K/PB102 is the most widely used of the wrought phosphor bronzes.
Chemical Composition
|
EN 1652:1998 CW451K |
|
|---|---|
| Chemical Element | % Present |
| Copper (Cu) | balance |
| Lead (Pb) | 0.02 max |
| Iron (Fe) | 0.1 max |
| Nickel (Ni) | 0.2 max |
| Others (Total) | 0.2 max |
| Zinc (Zn) | 0.2 max |
| Phosphorous (P) | 0.01 - 0.4 |
| Tin (Sn) | 4.5 - 5.5 |
Alloy Designations
CW451K/PB102 Bronze corresponds to the following designations but may not be a direct equivalent:
UNS C51000
ISO CuSn5
Supplied Forms
CW451K/PB102 is typically supplied as Drawn round rod, Plate and Hard sheet
- Bar
- Plate
- Sheet
Generic Physical Properties
| Physical Property | Value |
|---|---|
| Density | 8.85 g/cm³ |
| Melting Point | 930 °C |
| Modulus of Elasticity | 121 GPa |
| Thermal Conductivity | 63 W/m.K |
| Electrical Resistivity | 0.096 x10^-6 Ω .m |
Mechanical Properties
|
EN 1652:1998 Sheet - 0.1mm to 5.00mm |
|
|---|---|
| Mechanical Property | Value |
| Proof Stress | 240-670 MPa |
| Tensile Strength | 400-720 MPa |
| Elongation A50 mm | 2-45 % |
| Hardness Vickers | 75 to 230 HV |
Mechanical values are variable depending on the condition of the material i.e. 1/2 hard, 1/4 hard etc. Mechanical values for bar are a typical average.
Heat Treatment
Solution treatment or annealing of CW451K/PB102 can be done by rapid cooling after heating to 500-700°C.
Cold Working
Cold working response of CW451K/PB102 is excellent.
Machinability
The machinability rating of CW451K/PB102 is rated as poor at 20 compared to Brass CZ121/CW614N which is rated as 100.
Corrosion Resistance
Alloy CW451K/PB102 has good corrosion resistance, almost equivalent to that displayed by the Aluminium Bronzes.
Hot Working
Hot formability of CW451K/PB102 is poor.
Weldability
Soldering, brazing and butt welding of CW451KPB102 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.