Constantan( Ohmalloy 049)
(Common Name: CuNi45, NC50.Cuprothal, Alloy 294, Cuprothal 294, Nico, MWS-294, Cupron, Copel, Alloy 45, Neutrology, Advance, CuNi 102, Cu-Ni 44, Konstantan,constantan.)
OhmAlloy049 is a copper-nickel alloy (Cu56Ni44 alloy) characterized by high electrical resistance, high
ductility and good corrosion resistance. It is suitable for use at temperatures up to 400°C
Typical applications for OhmAlloy49 are temperature-stable potentiometers, industrial rheostats and
electric motor starter resistances. The combination of negligible temperature coefficient and high resistivity makes the alloy particulary
suitable for the winding of precision resistors. OhmAlloy049 is manufactured from electrolytic copper and pure nickel. In finer wire sizes the alloy is
designated as OhmAlloy49TC(Thermocouple)
Normal composition%
| Nickel | 45 | Manganese | 1 |
| Copper | Bal. | | |
Typical Mechanical properties(1.0mm)
| Yield strength | Tensile Strength | Elongation |
| Mpa | Mpa | % |
| 250 | 420 | 25 |
Typical Physical properties
| Density (g/cm3) | 8.9 |
| Electrical resistivity at 20ºC (Ωmm2/m) | 0.49 |
| Temperature factor of resistivity(20ºC~600ºC)X10-5/ºC | -6 |
| Conductivity coefficient at 20ºC (WmK) | 23Ω |