C521 Bronze Alloy Wire (CuSn8)
Download PDF
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
| Temper Name | Temper Code | Tensile Strength (N/mm²) | Mill Limits | |
| Min | Max | |||
| 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
| Temper Name | Temper Code | Tensile Strength (N/mm²) | Mill Limits | |
| Min | Max | |||
| 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
| Temper Name | Temper Code | Tensile Strength (N/mm²) | Mill Limits | |
| Min | Max | |||
| Annealed | 365 | 460 |
Thickness: Width: |
|
| 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.