Nikrothal® 42

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^®.

Nikrothal^® 42 is an austenitic nickel-chromium alloy (NiCr-alloy) for use at temperatures up to 1150°C (2100°F). The alloy is characterized by good ductility after use and good corrosion resistance, except in sulphur containing atmospheres and certain controlled atmospheres.

Nikrothal^® 42 has an attractive combination of oxidation resistance and form stability making it a suitable alloy for open-coil heating elements.

Typical applications for Nikrothal^® 42 are electric heating elements in domestic appliances and other heating equipment

Chemical composition

	C %	Si %	Mn %	Cr %	Ni %	Fe %	Trace elements
Nominal composition						Bal.	Added
Min	-	1.0	-	19.0	41.5		-
Max	0.10	1.7	1.0	22.0	44		-

Mechanical properties

Wire size	Yield strength	Tensile strength	Elongation	Hardness
Ø	R_p0.2	R_m	A
mm	MPa	MPa	%	Hv
1.0	340	760	35	180
4.0	300	740	30	160

Physical properties

Density g/cm³	7.96
Electrical resistivity at 20°C Ω mm²/m	1.08

Temperature factor of resistivity
Temperature °C	100	200	300	400	500	600	700	800	900	1000	1100
Ct	1.03	1.07	1.09	1.11	1.13	1.14	1.16	1.17	1.18	1.20	1.21

Coefficient of thermal expansion
Temperature °C	Thermal Expansion x 10^-6/K
20 - 250	15
20 - 500	16
20 - 750	17
20 - 1000	18

Thermal conductivity
Temperature °C	20	100	200	300	400	500	600	700	800	900	1000	1100
W m^-1 K^-1	13	14	15	16	18	19	21	22	24	25	26	28

Specific heat capacity
Temperature °C	20	100	200	300	400	500	600	700	800	900	1000	1100
kJ kg^-1 K^-1	0.48	0.48	0.49	0.51	0.54	0.56	0.59	0.61	0.64	0.67	0.69	0.72

Melting point °C	1390
Max continuous operating temperature in air °C	1150
Magnetic properties	The material is non-magnetic
Emissivity - fully oxidized material	0.88