Sarma Resistohm 80 echivalent Nikrothal 80

Resistant Alloys
Nickel Chromium Alloys
1. Chemical composition
Ni Cr Fe Cu Others
% 80 20 - - Si +
Major specification: Resistohm 80 alloy is in
conformity with ASTM B 344 and Werkstoff Nr.
2.4869.
2. Physical properties
- Resistivity (mm �/m) : 1.08
- Temperature coefficient (K x 10- 6/ �C) : 60
from 20 to 1000 �C
- Thermal conductivity at 120 �C (Wm- 1 � C-1) : 15.0
- Coefficient of linear expansion (coeff. 10-6/ �C) : 17.50
from 20 to 1000 �C
- Density (g/cm3) : 8.35
- Creeping point in
- at 800 �C : 15
- at 1 000 �C : 4
- Melting point ( �C) : 1 400
- Maximal operating temperature ( �C) : 1 200
Standard mechanical properties
- Tensile Strength (daN/mm �) : 76.0
- Yield Strength (daN/mm �) : 33.0
- Elongation (A% on 100 mm) : 30
- Hardness (HV) : 220
3. Typical Applications
Chemical composition of 80% Nickel and 20%
Chromium makes of him the most well-known
resistive alloy. It contains rare-earth additions for
increased oxidation resistance, especially under
conditions of frequent switching or wide temperature
fluctuations.
Resistohm 80 gives extraordinary performances at
temperatures up to 1200 �C and will be operational at
those high temperatures under the most exacting
conditions.
It is the first choice for all heating elements operating
at high temperatures or for each element subject to
important heating and cooling cycles, as well in the
domestic as in the industrial applications.
Electric furnaces, high temperature elements, heating
batteries are among others typical applications of this
alloy.
This nuance presents an excellent resistance to hot
flow and a very good dimensional stability of the
spirals with successive heating cycles.
In an alternated oxidising/reducing atmosphere,
Resistohm 80 can be subject to the “green rot