| Alloy Name | |
|---|---|
| AMW-24 | CuZn20 |
| IS | CuZn20 |
| ISO | CuZn20 |
| UNS | C24000 |
| JIS | C2400 |
CuZn20 has excellent cold forming, good hot forming properties and is well suited for e.g. coinage, beating, embossing. This alloy has a higher strength than pure copper. CuZn20 has good welding and brazing properties as well as a good corrosion resistance and is not fragile to stress corrosion and dezincification. It is principally used in jewelers, metal goods, watch industry and in electronic industry for installation parts.
| Chemical Composition | Weight Percentage |
|---|---|
| Cu | 78.5 – 81.5 % |
| Pb | 0.05 % |
| Fe | 0.05 % |
| Zn | Remainder % |
| Total Impurity | 0.15 % |
| Main Applications |
|---|
| Electrical: Battery Caps, Rotor Bars, AC Motors |
| Industrial: Pump Lines, Welding Wire, Flexible Hose |
| Consumers: Clock Dials, Musical Instrument Parts |
| Architecture: Ornamental Components |
| Physical Properties (Typical values in annealed temper at 20°C) | ||
|---|---|---|
| Density | 8.67 | g/cm³ |
| Thermal expansion coefficient -191 .. 16 | 9.0 | 10⁻⁶/K |
| Specific heat capacity - 0 .. 300°C | 18.8 | 10⁻⁶/K |
| Thermal conductivity | 0.380 | J/(g•K) |
| Electrical conductivity (1 MS/m = 1 m/(Ω mm²)) | 142 | W/(m•K) |
| Electrical conductivity (IACS) | 32.8 | MS/m % |
| Thermal coefficient of electrical resistance (0 .. 200°C) | 1.5 | 10⁻³/K |
| Modulus of elasticity (1 GPa = 1 kN/mm²) cold formed | 119 | GPA |
| Mechanical Properties (EN 1652) | ||||
|---|---|---|---|---|
| Temper | Tensile Strength Rm MPa | Yield Strength Rp0.2 MPa | Elongation A50mm % | Hardness HV |
| O (Soft) | 265 Min | 150 | 40 Min | 80 Max |
| HB (Half Hard) | 340 Min | 200 | 10 Min | 95 Min |
| HD (Hard) | 400 Min | 320 | 5 Min | 120 Min |