Metal spring plate Copper terminal Beryllium copper plated with nickel
Copper-Nickel-Zinc has beautiful color, ductility, fatigue resistance, corrosion resistance, rich deep drawing performance, uses: mobile phone shield, liquid crystal oscillating element shell, crystal shell, sliders for potentiometer, medical machinery, construction, wind instruments, etc. The common brand names are C7521, C7541 and C7701
C7521 product form is mainly plate and strip. Due to moderate hardness, suitable for deep drawing, and good welding performance, it is widely used as a shield material in the electronics industry. C7521 is also used in the manufacture of springs, motors, connectors, eyeglasses, probes, liquid crystal oscillating element housing, crystal housing, sliders for potentiometers, medical instruments, Musical Instruments, etc.
Comparison of Chemical constituents of C7521 and BZn18-17
| GB/T5231-2012 | JIS H3110:2012 | ||
| BZn18-17 | C7821 | ||
| Cu | 62.0-66.0 | Cu | 62.0-66.0 |
| Ni+Co | 16.5-19.5 | Ni | 16.5-19.5 |
| Fe | ≤0.25 | Fe | ≤0.25 |
| Mn | ≤0.5 | Mn | ≤0.5 |
| Pb | ≤0.03 | Pb | ≤0.03 |
| Zn | Margin | Zn | Margin |
| impurities | ≤1.3 | Other | - |
Mechanical properties of C7521
| Type | State | Tensile strength /MPa |
Elongation % |
Hardness test HV |
| C7521P C7521R |
O | ≥375 | ≥20 | - |
| 1/2H | 440-570 | ≥5 | 120-180 | |
| H | 540-640 | ≥3 | 150-210 | |
| EH | ≥610 | - | ≥185 |
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