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Main characteristics of Ni-Cr and Ni-Cr-Fe electric heating alloys

             Alloy Nomenclature

  Performance

Cr20Ni80

Cr30Ni70

Cr15Ni60

Cr20Ni35

Cr20Ni30

Main

Chemical

composition

Ni

Rest

Rest

55.0-61.0

34.0-37.0

30.0-34.0

Cr

20.0-23.0

28.0-31.0

15.0-18.0

18.0-21.0

18.0-21.0

Fe

1.0

1.0

Rest

Rest

Rest

Max. continuous service temp. 
of element

1200

1250

1150

1100

1100

Resistivity at 20º
(
μΩ·m)

1.09

1.18

1.12

1.0

1.04

Density 
(g/cm3)

8.40

8.10

8.20

7.90

7.90

Thermal conductivity
(KJ/m
·h·ºC)

60.3

45.2

45.2

43.8

43.8

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

18.0

17.0

17.0

19.0

19.0

Melting point 
(approx.)(
ºC)

1400

1380

1390

1390

1390

Elongation at 
rupture (%)

>20

>20

>20

>20

>20

Micrographic 
structure

austenite

austenite

austenite

austenite

austenite

Magnetic 
properties

nonmagnetic

nonmagnetic

nonmagnetic

Weak magnetic

Weak magnetic

Note:types and sizes list in this table are common ones.We also provide other special types.

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