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Copper Nickel resistance heating wire

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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