Cuprothal® 49 is a copper-nickel alloy (CuNi alloy) characterized by high electrical resistance, high ductility and good corrosion resistance. It is suitable for use at temperatures up to 600°C (1110°F).
Typical applications for Cuprothal® 49 TC are temperature-stable potentiometers, industrial rheostats and electric motor starter resistances.
The combination of negligible temperature coefficient and high resistivity makes the alloy particularly suitable for the winding of precision resistors.
Cuprothal® 49 TC is manufactured from electrolytic copper and pure nickel.
Chemical composition
|
Ni % |
Mn % |
Fe % |
Cu % |
| Nominal Composition |
44.0 |
1.0 |
0.5 |
Bal. |
Mechanical properties
| Wire size |
Yield strength |
Tensile strength |
Elongation |
Hardness |
| Ø |
Rp0.2 |
Rm |
A |
|
| mm (in) |
MPa (ksi) |
MPa (ksi) |
% |
Hv |
| 1.00 (0.04) |
250 (36) |
480 (70) |
30 |
100-130 |
Physical properties
| Density g/cm3 (lb/in3) |
8.9 (0.322) |
| Electrical resistivity at 20°C Ω mm2/m (Ω circ. mil/ft) |
0.49 (295) |
| Temperature coefficient of resistance K-1 |
± 20 ppm (wire < 0.30 mm) |
| |
± 60 ppm (wire > 0.30 mm) |
Temperature factor of resistivity
| Temperature °C |
100 |
200 |
300 |
400 |
500 |
600 |
| Temperature °F |
212 |
392 |
572 |
752 |
932 |
1112 |
| Ct |
1.002 |
1.002 |
1.001 |
1.005 |
1.017 |
1.037 |
Coefficient of thermal expansion
| Temperature °C (°F) |
Thermal Expansion X10-6/K (10-6 /°F) |
| 20-100 (68-212) |
14 (7.8) |
Thermal conductivity
| Temperature °C (°F) |
20 (68) |
| W m-1 K-1 (Btu h-1ft-1°F-1) |
21.0 (12.1) |
Specific heat capacity
| Temperature °C (°F) |
20 (68) |
| kJ kg-1 K-1 (Btu lb-1 °F-1) |
0.410 (0.10) |
| Melting point °C (°F) |
1280 (2336) |
| Max continuous operating temperature in air °C (°F) |
600 (1112) |
| Magnetic properties |
The material is non-magnetic |
