OhmAlloy49
(Common Name:Constantan CuNi44,NC50.Cuprothal, Alloy 294, Cuprothal 294, Nico, MWS-294, Cupron, Copel, Alloy 45, Neutrology, Advance, CuNi 102, Cu-Ni 44, Konstantan,)
OhmAlloy49 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,electric motor starter resistances and strain gauge.
The combination of negligible temperature coefficient and high resistivity makes the alloy particulary suitable for the winding of precision resistors.
OhmAlloy49 is manufactured from electrolytic copper and pure nickel. In finer wire sizes the alloy is designated as OhmAlloy49TC(Thermocouple).Normal composition%
| Nickel | 44 | Manganese | 1 |
| Copper | Bal. | | |
Typical Mechanical properties(1.0mm)
| Yield strength | Tensile Strength | Elongation |
| Mpa | Mpa | % |
| 250 | 420 | 30 |
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) | 23 |
| EMF vs Cu(μV/ºC )(0~100ºC ) | -43 |
Coefficient of thermal expansion |
| Temperature | Thermal Expansion x10-6/K |
| 20 ºC- 400ºC | 15 |
| Specific heat capacity |
| Temperature | 20ºC |
| J/gK | 0.41 |
| Melting point (ºC) | 1280 |
| Max continuous operating temperature in air (ºC) | 400 |
| Magnetic properties | non-magnetic |
Corrosion resistance performance
| Alloys | Working In atmosphere at 20ºC | Working at max temperature 200ºC |
Air and oxygen contain
gases | gases with Nitrogen | gases with sulfur
oxidability | gases with sulfur
reductibility | carburization |
| OhmAlloy49 | good | good | good | good | bad | good |
Style of supply
| Alloys Name | Type | Dimension |
| OhmAlloy49W | Wire | D=0.03mm~8mm |
| OhmAlloy49R | Ribbon | W=0.4~40 | T=0.03~2.9mm |
| OhmAlloy49S | Strip | W=8~200mm | T=0.1~3.0 |
| OhmAlloy49F | Foil | W=6~120mm | T=0.003~0.1 |
| OhmAlloy49B | Bar | Dia=8~100mm | L=50~1000 |