China CuNi44 / Constantan Copper Nickel Strip, Alloy Strip for Resistors & Welding Manufacture and Factory

CuNi44 / Constantan Copper Nickel Strip, Alloy Strip for Resistors & Welding

Short Description:

CuNi44 constantan alloy strip (Copper-Nickel 55/44), low temperature coefficient of resistance (TCR < ±40 ppm/°C), high thermal EMF vs copper. Ideal for precision wirewound resistors, thermocouples, and resistance welding electrodes. Thickness from 0.1mm to 3.0mm, width up to 300mm. Good solderability and corrosion resistance.

Alloy Grade: CuNi44 (Constantan)

Composition: Cu ~55%, Ni ~44%, Mn ~1%

TCR (±40 ppm/°C): ≤ ±40 ppm/°C (20-60°C)

Resistivity: 0.49 μΩ·m @20°C

Thermal EMF vs Cu: ~42 μV/°C (0-100°C)

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Product Description

Cuni44 CU-NI-Mn Copper Nickel Alloy resistance Constantan Strip
(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,)

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 CuNi44 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.
CuNi44 is manufactured from electrolytic copper and pure nickel. In finer wire sizes the alloy is designated as Cuni45(Thermocouple).
Product Description

Constantan Strip with moderate resistivity and low temperature coefficent of resistance with a flat resistance/temperature curve over a wider range than the “manganins”. Constantan also shows better corrosion resistance than the man ganins. Uses tend to be restricted to ac circuits.

Constantan is also the negative element of the type J thermocouple with Iron being the positive; type J thermocouples are used in heat treating applications. Also, it is the negative element of the type T thermocouple with OFHC Copper the positive; type T thermocouples are used at cryogenic temperatures.

Chemical Content, %

Ni	Mn	Fe	Si	Cu	Other	ROHS Directive
						Cd	Pb	Hg	Cr
44	1.50%	0.5	-	Bal	-	ND	ND	ND	ND

Mechanical Properties

Max Continuous Service Temp	400ºC
Resisivity at 20ºC	0.49±5%ohm mm2/m
Density	8.9 g/cm3
Thermal Conductivity	-6(Max)
Melting Point	1280ºC
Tensile Strength,N/mm2 Annealed,Soft	340~535 Mpa
Tensile Strength,N/mm3 Cold Rolled	680~1070 Mpa
Elongation(anneal)	25%(Min)
Elongation(cold rolled)	≥Min)2%(Min)
EMF vs Cu, μV/ºC (0~100ºC)	-43
Micrographic Structure	austenite
Magnetic Property	Non