CuNi45/CuNi44 Constantan Resistance Copper Nickel Alloy Strip

• Product Type: Strip
• Material: CuNi Alloy
• Carbon Content: N/A
• PCD: N/A
• ET: N/A
• Hole: N/A
• Model NO.: Constantan
• standard: GB/ASTM/JIS/BIS/DIN
• surface: bright
• Size: 0.01-10mm
• Resistivity 20C: 0.49
• Sample: Free
• Thickness: 0.02-2mm
• Width: 1-350mm
• Name: Constantan / Konstantan
• Transport Package: According Client′s Requirement
• Specification: 0.02mm~3.0mm
• Trademark: TANKII
• Origin: China
• HS Code: 74094000
• Production Capacity: 3000tons/Year

Product Description

CuNi45/CuNi44 Constantan Resistance Copper Nickel Alloy Strip

Constantan 
Resistance alloy 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 manganins. 
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

 
Application:
CuNi44 is a copper-nickel alloy that contains specific minor amounts of additional elements to achieve precise values for the temperature coefficient of resistivity. Careful control of melting and conversion practices results in a very low level of pinholes at
ultra-thin thicknesses. The alloy is used extensively for foil resistors and strain gauges.