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Ohmalloy Material Co.,Ltd

[Province: Shanghai ]

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CuNi40 Constantan Copper Based Alloys 25% Elongation High Resistance Wire

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CuNi40 Constantan Copper Based Alloys 25% Elongation High Resistance Wire

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CuNi40 Constantan Copper Based Alloys 25% Elongation High Resistance Wire

OhmAlloy49(Resistance heating wire and resistance wire)
(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.)

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 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.
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	25

Typical Physical properties

Density (g/cm3)	8.9
Electrical resistivity at 20 (mm2/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

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
OhmAlloy49	good	good	good	good	bad	good