Hyper Phosphor Bronze
C5240 (HP)
C5240 (HP)
High Strength 10% Tin Phosphor Bronze
Overview
Hi-Performance C5240 alloy (C5240 (HP)), was developed by enhancing the conventional phosphor bronze alloy C5240. C5240 alloy is phosphor bronze containing 10% tin, with greater strength than 8% tin phosphor bronze (C5210 alloy) and excellent bend formability. A further improvement in bend formability is achieved by means of our strength-enhancing technology. As a material in increasingly compact switches, connectors, relays, and other electronic parts, it meets customer requirements with its high strength properties.
(We provide the Hi-Performance Series-materials with the same composition as conventional products but with advanced material properties achieved by precision process control.)
Table 1. C5240R (HP) chemical composition (%)
| Cu | Sn | P | Fe | Pb | Cu+Sn+P | |
|---|---|---|---|---|---|---|
| Standard composition | Remainder | 10.0 | 0.15 | ≦ 0.10 | ≦ 0.05 | ≧ 99.7 |
Table 2. Physical properties of C5240R (HP)
| Electrical conductivity | 10 | %IACS(@20℃) |
|---|---|---|
| Specific resistance | 157 | nΩ·m(@20℃) |
| Thermal conductivity | 50 | W/mK |
| Linear expansion coefficient | 18.4 | ×10-6/K(20 to 300℃) |
| Modulus of elasticity | 100 | GPa |
| Density | 8.78 | g/cm3 |
Table 3. Mechanical properties of C5240R (HP) (specifications)
| Temper | Tensile strength (MPa) |
Yield strength (MPa) |
Elongation (%) |
Vickers hardness (Hv) |
|---|---|---|---|---|
| H | 650-750 | 580-690 | ≧11 | 200-240 |
| EH | 750-850 | 650-790 | ≧9 | 230-270 |
| SH | 850-950 | 780-920 | ≧5 | 250-290 |
| ESH | 950-1,050 | 900-1030 | ≧1 | 270-310 |
| XSH | 1,000-1,200 | 950-1190 | Rec. | 290 or higher |
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