Nifethal® 70

Resistance heating wire and resistance wireDatasheet

Datasheet updated 2021-02-04 13:33 (supersedes all previous editions)

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^®.

Nifethal^® 70 is a nickel-iron alloy (NiFe alloy) for use at temperatures up to 600°C (1110°F). The alloy is characterized by very low resistivity and high temperature coefficient of resistance.

Typical applications for Nifethal^® 70 are in voltage regulators, timing devices, temperature sensitive resistors, temperature compensating devices and low temperature heating applications.

Chemical composition

	Ni %	Fe %
Nominal composition	72	Bal.

Mechanical properties

Wire size	Yield strength	Tensile strength	Elongation
Ø	R _p0.2	R_m	A
mm	MPa	MPa	%
0.5	340	640	30

Physical properties

Density g/cm³	8.45
Electrical resistivity at 20°C Ω mm²/m	0.20

Temperature factor of resistivity
Temperature °C	100	150	200	250	300	350	400	450	500
Ct	1.42	1.68	1.91	2.19	2.47	2.75	3.03	3.34	3.66

Coefficient of thermal expansion
Temperature °C	Thermal Expansion X10^-6/K
20-100	15

Thermal conductivity
Temperature °C	20
W m^-1 K^-1	17

Specific heat capacity
Temperature °C	20
kJ kg^-1 K^-1	0.52

Melting point °C	1430
Max continuous operating temperature in air °C	600
Magnetic properties	The material is magnetic up to approximately 610°C (the Curie point).