Standard designation
| EN: | CuNi18Zn20/CW409J |
| UNS: | C 76400* |
Chemical composition
| Cu: | 60 - 63 % |
| Ni: | 17 - 19 % |
| Zn: | Balance |
Physical properties1)
| Density: | 8,7 g/cm³ |
| Electrical conductivity: | 3,3 m/Ω·mm² = 5,5 % IACS2) |
| Thermal conductivity: | 33 W/m·K |
| Thermal expansion coefficient: | 17,7·10-6/K |
| Modulus of elasticity: | 140 GPa3) |
1) Guideline values for room temperature
2) IACS =International Annealed Copper Standard
3) 1 GPa = 1 kN/mm²
Processing information
| Weldability: | good |
| Solderability: | medium |
| Stress corrosion cracking: | none |
Mechanical properties
|
Temper |
R380/H110 |
R450/H140 |
R500/H160 |
|
Tensile strength RM |
380-450 MPa4) |
450-520 MPa |
500-590 MPa |
|
Yield strength RP0.2 |
≤ 250 MPa |
≥ 250 MPa |
≥ 410 MPa |
|
Elongation A50 |
≥ 27 % |
≥ 9 % |
≥ 3 % |
|
Hardness HV |
85-115 |
115-160 |
160-190 |
|
Temper |
R580/H180 |
R610/H200 |
|
Tensile strength RM |
580-670 MPa |
640-730 MPa |
|
Yield strength RP0.2 |
≥ 510 MPa |
≥ 600 MPa |
|
Elongation A50 |
- |
- |
|
Hardness HV |
180-210 |
200-230 |