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CuNi44
(Common Name:CuNi44,NC50.Cuprothal, Alloy 294, Cuprothal 294, Nico, MWS-294, Cupron, Copel, Alloy 45, Neutrology, Advance, CuNi 102, Cu-Ni 44, Konstantan,constantan.)
CuNi44 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.
CuNi44 is manufactured from electrolytic copper and pure nickel. In finer wire sizes the alloy is designated as CuNi44TC(Thermocouple).
Normal composition%
Nickel
44
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 20℃ (Ωmm2/m)
0.49
Temperature factor of resistivity(20℃~600℃)X10-5/℃
-6
Conductivity coefficient at 20℃ (WmK)
23
EMF vs Cu(μV/℃ )(0~100℃ )
-43
Coefficient of thermal expansion
Temperature
Thermal Expansion x10-6/K
20 ℃- 400℃
15
Specific heat capacity
Temperature
20℃
J/gK
0.41
Melting point (℃)
1280
Max continuous operating temperature in air (℃)
400
Magnetic properties
non-magnetic
Corrosion resistance performance
Alloys
Working In atmosphere at 20℃
Working at max temperature 200℃
Air and oxygen contain
gases
gases with Nitrogen
gases with sulfur
oxidability
gases with sulfur
reductibility
carburization
CuNi44
good
good
good
good
bad
good
Style of supply
Alloys Name
Type
Dimension
CuNi44W
Wire
D=0.03mm~8mm
CuNi44R
Ribbon
W=0.4~40
T=0.03~2.9mm
CuNi44S
Strip
W=8~200mm
T=0.1~3.0
CuNi44F
Foil
W=6~120mm
T=0.003~0.1
CuNi44B
Bar
Dia=8~100mm
L=50~1000