Phosphor Bronze A is a Copper base spring material with a good combination of strength, formability, and corrosion resistance. The material is suitable for use in certain contact springs and diaphragms.
The alloy has good formability up to moderate strength. It can be soldered, silver brazed, and resistance welded.
Available Sizes:
Phosphor Bronze A is available from Hamilton Precision Metals as strip products in thicknesses from 0.001” to 0.020” (0.0254 mm to 0.508 mm) in widths up to 12.0”
(304.8 mm). The material conforms to ASTM B 103 and UNS C51000.
Nominal Composition
| PHOSPHOR BRONZE A NOMINAL COMPOSITION |
| Phosphorus |
0.2%
|
| Tin |
5.0%
|
| Copper |
Balance
|
Mechanical Properties
| PHOSPHOR BRONZE A MECHANICAL PROPERTIES |
|
ANNEALED |
COLD ROLLED |
| Ultimate Tensile Strength |
50,000 PSI |
110,000 PSI |
| Yield Strength (0.2% Offset) |
20,000 PSI |
105,000 PSI
|
| Elongation in 2” * |
45%
|
2%
|
| Modulus of Elasticity (Tension) |
16 X 10+6 PSI
|
-
|
| Poisson’s Ratio |
0.33
|
-
|
*The measured elongation will be less as thickness decreases to 0.002” and less.
These values may be adjusted by control of process variables – consult HPM for desired values
Physical Properties
| PHOSPHOR BRONZE A PHYSICAL PROPERTIES |
| Density |
0.320 lbs/cu.in. |
| Melting Point (Approx.) |
950°C |
| Electrical Resistivity @ R.T. |
11.5 Microhm·cm |
|
Thermal Expansion Coefficient (20° to 300°C)
|
17.8 X 10-6/°C
|
| Thermal Conductvity @ R.T. |
69.2 W/m·K
|
| Magnetic Attraction |
None |
Typical values to guide alloy selection but are not a guarantee of minimum or maximum.