Nikrothal® 40B

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^®.

Chemical composition

	C %	Si %	Mn %	Cr %	Ni %	Fe %
Nominal composition						Bal.
Min	-	-	-	18.0	34.0
Max	0.10	1.0	1.0	21.0	37.0

Mechanical properties

Wire size	Yield strength	Tensile strength	Elongation	Hardness
Ø	R_p0.2	R_m	A
mm	MPa	MPa	%	Hv
1.0	450	750	30	180
4.0	300	650	30	160

Mechanical properties at elevated temperature
Temperature °C	900
MPa	120

Ultimate tensile strength - deformation rate 6.2 x 10^-2/min^-1

Creep strength - 1% elongation in 1000 h
Temperature °C	800	1000
MPa	20	4

Physical properties

Density g/cm³	7.90
Electrical resistivity at 20°C Ω mm²/m^-1	0.96

Temperature factor of resistivity
Temperature °C	100	200	300	400	500	600	700	800	900	1000	1100
Ct	1.03	1.06	1.10	1.12	1.15	1.17	1.19	1.21	1.22	1.23	1.24

Coefficient of thermal expansion
Temperature °C	Thermal Expansion x 10^-6/K
20 - 250	16
20 - 500	17
20 - 750	18
20 - 1000	19

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	0.50	0.50	0.50	0.51	0.54	0.57	0.60	0.62	0.64	0.67	0.70	0.73

Melting point °C	1390
Max continuous operating temperature in air °C	1100
Magnetic properties	The material is non-magnetic
Emissivity - fully oxidized material	0.88