Alloy C521 is a high tin alloy of the phosphor bronze family. The additional tin relative to the more commonly used C510 results in higher mechanical properties with a modest reduction in electrical conductivity. Applications include electronic parts, springs, contacts, switch parts and fasteners.
Mechanical Properties
Round Wire
| Annealed |
|
53 |
68 |
.0010 - .1285 inch |
| 1/4 Hard |
H01 |
74 |
91 |
| 1/2 Hard |
H02 |
95 |
115 |
| 3/4 Hard |
H03 |
113 |
135 |
| Hard |
H04 |
125 |
150 |
Square Wire
| Annealed |
|
53 |
68 |
.0100 - .0808 inch |
| 1/4 Hard |
H01 |
74 |
91 |
| 1/2 Hard |
H02 |
95 |
115 |
| 3/4 Hard |
H03 |
113 |
135 |
| Hard |
H04 |
125 |
150 |
Rolled Flat
| Annealed |
|
53 |
67 |
Thickness:
.0100 - .0500 inch
Width:
.0150 - .2500 inch
|
| 1/2 Half Hard |
H02 |
69 |
84 |
| Hard |
H04 |
85 |
100 |
| Extra Hard |
H06 |
97 |
112 |
| Spring |
H08 |
105 |
119 |
| Extra Spring |
H10 |
110 |
122 |
Physical Properties
| Melting Point (Liquidis) |
1880°F |
| Melting Point (Solidus) |
1620°F |
| Density |
0.318 lbs/cu in |
| Electrical Resistivity (Annealed) |
79.8 Ω⋅cmil/ft @ 68°F |
| Electrical Conductivity (Annealed) |
13% IACS @ 68°F |
| Thermal Conductivity (Solutionized-Aged) |
36 Btu ft/sq ft hr °F @ 68°F |
| Coefficient of Thermal Expansion |
0.0000101°F (68-572°F) |
| Modulus of Elasticity (Tension) |
16000 ksi |
| Modulus of Rigidity |
6000 ksi |
Mechanical Properties
Round Wire
| Annealed |
|
365 |
470 |
.0254 - 3.264 mm |
| 1/4 Hard |
H01 |
510 |
625 |
| 1/2 Hard |
H02 |
655 |
795 |
| 3/4 Hard |
H03 |
780 |
930 |
| Hard |
H04 |
860 |
1035 |
Square Wire
| Annealed |
|
365 |
470 |
.2540 - 1.905 mm |
| 1/4 Hard |
H01 |
510 |
625 |
| 1/2 Hard |
H02 |
655 |
795 |
| 3/4 Hard |
H03 |
780 |
930 |
| Hard |
H04 |
860 |
1035 |
Rolled Flat
| Annealed |
|
365 |
460 |
Thickness:
.2540 - 1.905 mm
Width:
.3810 - 6.350 mm
|
| 1/2 Half Hard |
H02 |
475 |
580 |
| Hard |
H04 |
585 |
690 |
| Extra Hard |
H06 |
670 |
770 |
| Spring |
H08 |
725 |
820 |
| Extra Spring |
H10 |
760 |
840 |
Physical Properties
| Melting Point (Liquidis) |
1027°C |
| Melting Point (Solidus) |
882°C |
| Density |
8.80232 gm/cu cm |
| Electrical Resistivity (Annealed) |
13.2662 ?? -cm @ 20°C |
| Electrical Conductivity (Annealed) |
0.0761 MegaSiemens /cm @ 20°C |
| Thermal Conductivity (Solutionized-Aged) |
62.33684211 W/m · °K @ 20°C |
| Coefficient of Thermal Expansion |
0.00001818°C (20-300°C) |
| Modulus of Elasticity (Tension) |
110300 MPa |
| Modulus of Rigidity |
41400 MPa |
For a full size version of product specifications, including chemical composition in both US and Metric units, please download the PDF.
