Nikrothal® 40

StripDatasheet

Datasheet updated 2024-09-05 12:01 (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^® 40 strip is an austenitic nickel-chromium alloy (NiCr alloy) for use at temperatures up to 1100°C (2010°F). The alloy is characterized by high resistivity and good corrosion resistance except in sulphur containing atmospheres and certain controlled atmospheres. It has good ductility after use and excellent weldability.

Typical applications for Nikrothal^® 40 strip are as braking resistors and as electrical heating elements in industrial furnaces.

Chemical composition

	C %	Si %	Mn %	Cr %	Ni %	Fe %
Nominal Composition						Bal.
Min	-	1.6	-	18.0	34.0
Max	0.10	2.5	1.0	21.0	37.0

Mechanical properties

Strip Thickness	Yield Strength	Tensile strength	Elongation	Hardness
	R_p0.2	R_m	A
mm	MPa	MPa	%	Hv
0.45	450	705	25	165
1.0	400	700	30	170

Mechanical properties at elevated temperature
Temperature °C	800	900	1000
MPa	170	95	58

Ultimate tensile strength - deformation rate 5.0 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	1.04

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

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