Copper Nickel resistance heating wire

Copper Nickel Alloys

Principally destined for the manufacturing of low temperatures electric resistances so as heating cables, shunts, resistances for automobile, they have a maximum operating temperature of 752°F.
They do not therefore intervene in the field of resistances for industrial furnaces.

Those are alloys of chemical composition copper + nickel with addition of manganese with a low resistivity (from 231.5 to 23.6 Ohm.mm2/ft).

The most known, CuNi 44 (also called Constantan) presents the advantage of a very low temperature coefficient.

Their advantages are the following:

Very good resistance to corrosion
Very good malleability
Very good solderability

Chemical Composition and Main Property of Cu-Ni Low Resistance Alloy
PropertiesGrade		CuNi1	CuNi2	CuNi6	CuNi8	CuMn3	CuNi10
Main Chemical Composition	Ni	1	2	6	8	_	10
	Mn	_	_	_	_	3	_
	Cu	Bal	Bal	Bal	Bal	Bal	Bal
Max Continuous Service Temperature（oC）		200	200	200	250	200	250
Resisivity at 20oC (Ωmm2/m)		0.03	0.05	0.10	0.12	0.12	0.15
Density(g/cm3)		8.9	8.9	8.9	8.9	8.8	8.9
Thermal Conductivity(α×10-6/oC)		<100	<120	<60	<57	<38	<50
Tensile Strength(Mpa)		≥210	≥220	≥250	≥270	≥290	≥290
EMF vs Cu(μV/oC)(0~100oC)		-8	-12	-12	-22	_	-25
Approximate Melting Point( oC)		1085	1090	1095	1097	1050	1100
Micrographic Structure		austenite	austenite	austenite	austenite	austenite	austenite
Magnetic Property		non	non	non	non	non	non

PropertiesGrade		CuNi14	CuNi19	CuNi23	CuNi30	CuNi34	CuNi44
Main Chemical Composition	Ni	14	19	23	30	34	44
	Mn	0.3	0.5	0.5	1.0	1.0	1.0
	Cu	Bal	Bal	Bal	Bal	Bal	Bal
Max Continuous Service Temperature（oC）		300	300	300	350	350	400
Resisivity at 20oC (Ωmm2/m)		0.20	0.25	0.30	0.35	0.40	0.49
Density(g/cm3)		8.9	8.9	8.9	8.9	8.9	8.9
Thermal Conductivity(α×10-6/oC)		<30	<25	<16	<10	<0	<-6
Tensile Strength(Mpa)		≥310	≥340	≥350	≥400	≥400	≥420
EMF vs Cu(μV/oC)(0~100oC)		-28	-32	-34	-37	-39	-43
Approximate Melting Point( oC)		1115	1135	1150	1170	1180	1280
Micrographic Structure		austenite	austenite	austenite	austenite	austenite	austenite
Magnetic Property		non	non	non	non	non	non

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