Main characteristics of Nichrome electric heating alloys

Alloy Nomenclature

Cr20Ni80

Cr30Ni70

Cr15Ni60

Cr20Ni35

Cr20Ni30

Performance

Main

Ni

Rest

Rest

55.0-61.0

34.0-37.0

30.0-34.0

Chemical

Cr

20.0-23.0

28.0-31.0

15.0-18.0

18.0-21.0

18.0-21.0

composition

Fe

≤1.0

≤1.0

Rest

Rest

Rest

Max. continuous service temp. of element

1200

1250

1150

1100

1100

Resistivity at 20ºC                          (μΩ·m)

1.09

1.18

1.12

1

1.04

Density (g/cm³)

8.4

8.1

8.2

7.9

7.9

Thermal conductivity (KJ/m·h·ºC)

60.3

45.2

45.2

43.8

43.8

Coefficient of lines expansion  (α×10^-6/ºC)

18

17

17

19

19

Melting point (approx.)( ºC)

1400

1380

1390

1390

1390

Elongation  (%)

>20

>20

>20

>20

>20

Micrographic structure

austenite

austenite

austenite

austenite

austenite

Magnetic properties

nonmagnetic

nonmagnetic

Weak magnetic

Weak magnetic

Weak magnetic