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) |
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 |
| OhmAlloy049 |
good |
good |
good |
good |
bad |
good |
Style of supply
| Alloys Name |
Type |
Dimension |
| OhmAlloy049W |
Wire |
D=0.03mm~8mm |
| OhmAlloy049R |
Ribbon |
W=0.4~40 |
T=0.03~2.9mm |
| OhmAlloy049S |
Strip |
W=8~200mm |
T=0.1~3.0 |
| OhmAlloy049F |
Foil |
W=6~120mm |
T=0.003~0.1 |
| OhmAlloy049B |
Bar |
Dia=8~100mm |
L=50~1000 |
The thermocouple alloy wires with different varieties and specifications of our company can be applied in all kinds of thermocouples, the temperature ranges from -270ºC to 1800ºC. The thermocouple alloy wires have excellent performance and are extensively used in the temperature measurement and control in different fields, such as metallurgy, chemical industry, petroleum industry, machinery-electric industry, energy industry, agriculture and military industry. Our products conform to the standards of IEC584 -1and IEC-2 and ANSI96-1.
Characteristics:
Excellent thermoelectricity, excellent linear relationship between thermoelectrical potential and the temperature.
Excellent thermoelectrical stability, high accuracy.
Main technical data:
Thermocouple variety, index and temperature measurement range.
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