Nikrothal® 80/20 Cb

Construction materialsDatasheet

Datasheet updated 2023-01-30 08:55 (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^® 80/20 Cb is an austenitic nickel-chromium alloy (NiCr alloy) with addition of niobium. It is characterized by high mechanical strength and suitable for furnace temperatures up to 1200°C (2192°F).

Typical applications for Nikrothal^® 80/20 Cb are as wire in mesh belts.

Chemical composition

	C %	Si %	Mn %	Cr %	Nb %	Ni %	Fe %
Nominal composition					1.0	Bal.
Min	-	0.75	-	19.0	-	-	-
Max	0.3	1.50	2.5	21.0	-	-	1.0

Mechanical properties

Wire size	Yield strength	Tensile strength	Elongation	Hardness
Ø	R_p0.2	R_m	A
mm (in)	MPa (ksi)	MPa (ksi)	%	Hv
1.0 (0.04)	400 (58)	800 (116)	30	190
4.0 (0.16)	350 (51)	750 (109)	30	170

Mechanical properties at elevated temperature
Temperature °C (°F)	900 (1652)	1100 (2012)
MPa (ksi)	140 (20.3)	50 (7.3)

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

Creep strength - 0.5% elongation in 1000 h
Temperature °C (°F)	800 (1472)
MPa (psi)	15 (2200)

Physical properties

Density g/cm³(lb/in³)	8.30 (0.300)
Electrical resistivity at 20°C Ω mm²/m (Ω circ. mil/ft)	1.09 (656)

Temperature factor of resistivity
Temperature°C	100	200	300	400	500	600	700	800	900	1000	1100	1200
Temperature°F	212	392	572	752	932	1112	1292	1472	1652	1832	2012	2192
Ct	1.01	1.02	1.03	1.04	1.05	1.04	1.04	1.04	1.04	1.05	1.06	1.07

Coefficient of thermal expansion
Temperature °C (°F)	Thermal Expansion x 10^-6/K (10^-6 /°F)
20 - 250 (68-482)	14.1 (7.8)
20 - 500 (68-932)	14.9 (8.3)
20 - 750 (68-1382)	16.0 (8.9)
20 - 1000 (68-1832)	17.2 (9.6)

Thermal conductivity
Temperature °C	20	100	200	300	400	500	600	700	800	900	1000	1100
Temperature °F	68	212	392	572	752	932	1112	1292	1472	1652	1832	2012
W m^-1 K^-1	15	15	15	15	17	19	21	22	24	26	28	30
Btu h^-1ft^-1°F^-1	8.7	8.7	8.7	8.7	9.8	11.0	12.1	12.7	13.9	15.0	16.2	17.3

Specific heat capacity
Temperature °C	20	100	200	300	400	500	600	700	800	900	1000	1100
Temperature °F	68	212	392	572	752	932	1112	1292	1472	1652	1832	2012
kJ kg^-1 K^-1	0.46	0.46	0.48	0.50	0.52	0.54	0.56	0.60	0.63	0.65	0.67	0.70
Btu lb^-1°F^-1	0.11	0.11	0.11	0.12	0.12	0.13	0.13	0.14	0.15	0.16	0.16	0.17

Melting point °C (°F)	1400 (2552)
Max continuous operating temperature in air °C (°F)	1200 (2192)
Magnetic properties	The material is non-magnetic
Emissivity - fully oxidized material	0.88

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