Disclaimer: Recommendations are for guidance only, and the suitability of a material for a specific application can be confirmed only when we know the actual service conditions. Continuous development may necessitate changes in technical data without notice. This datasheet is only valid for materials under the trademark Kanthal®.
Nikrothal® 70 wire is an austenitic nickel-chromium alloy (NiCr alloy) for use at temperatures up to 1250°C (2280°F). The alloy is characterized by high resistivity and good oxidation resistance. It has good ductility after use and excellent weldability.
Nikrothal® 70 is particularly well suited for reducing atmospheres, as it is not subject to 'green rot'.
Nikrothal® 70 is used in electrical heating elements in industrial furnaces. The alloy is particularly well suited for reducing atmospheres, as it is not subject to 'green rot'.
C %
Si %
Mn %
Cr %
Fe %
Ni %
Trace elements
Nominal composition
Bal.
Added
Min
-
0.5
-
29.0
-
-
Max
0.15
2.0
1.0
32.0
5.0
-
Wire size
Yield strength
Tensile strength
Elongation
Hardness
Ø
Rp0.2
Rm
A
mm
MPa
MPa
%
Hv
1.0
430
820
30
185
4.0
425
800
30
185
Density g/cm3
8.10
Electrical resistivity at 20°C Ω mm2/m
1.18
Temperature factor of resistivity
Temperature °C
100
200
300
400
500
600
700
800
900
1000
1100
1200
Ct
1.01
1.02
1.03
1.04
1.05
1.05
1.04
1.04
1.04
1.05
1.05
1.06
Coefficient of thermal expansion
Temperature °C
Thermal Expansion x 10-6/K
20 - 250
13.7
20 - 500
14.6
20 - 750
15.8
20 - 1000
17.1
Thermal conductivity
Temperature °C
20
100
200
300
400
500
600
700
800
900
1000
1100
W m-1 K-1
13
13
14
15
17
19
20
22
24
26
28
29
Specific heat capacity
Temperature °C
20
100
200
300
400
500
600
700
800
900
1000
1100
kJ kg-1 K-1
0.46
0.46
0.48
0.50
0.53
0.55
0.58
0.60
0.63
0.65
0.67
0.71
Melting point °C
1380
Max continuous operating temperature in air °C
1250
Magnetic properties
The material is non-magnetic
Emissivity - fully oxidized material
0.88
Disclaimer: Recommendations are for guidance only, and the suitability of a material for a specific application can be confirmed only when we know the actual service conditions. Continuous development may necessitate changes in technical data without notice. This datasheet is only valid for materials under the trademark Kanthal®.
