Nikrothal 80 alloy is used in many appliance and industrial applications
Other names: Alloy 650, Nichrome 80, Chromel A, Tophet A
Very good wet corrosion resistance
Good protective chromium surface oxide layer
Remains ductile after use
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Industrial and appliance heating elements. Well suited for high temperature tubular elements
Temperature Coefficient Stability
- Max Temp : 2190°F / 1150°C
- Element Life : Good
- Temperature Coefficient Stability : Fair
- Oxidation Properties : Good
- Suitability For Suspended Elements : Yes
- Ductility After Use : Good
- Weldability After Use : Yes
Nikrothal® 80 is an austenitic nickel- chromium alloy (NiCr alloy) for use at temperatures up to 1200°C (2190°F). The alloy is characterized by high resistivity, good oxidation resistance and very good form stability. It has good ductility after use and excellent weldability.
Nikrothal® 80 is used for electric heating elements in home appliances and industrial furnaces. Typical applications are flat irons, ironing machines, water heaters, plastic molding dies, soldering irons, metal sheathed tubular elements, cartridge elements and heat treating furnaces.
Nikrothal®80 offers superior service life compared to competitive nickel-chromium alloys, due to extremely good adhesion properties of the surface oxide.
Resistivity vs. temperature chart for Nikrothal 80 and other KANTHAL alloys
Knowledge & tips
Important considerations when designing heating elements:
1. Maximum operating temperature
It is critical to choose a material that can withstand the required operating temperature and know that the wire will operate at a higher temperature than the environment that it is heating.
2. Will the element be suspended, fully supported or embedded
Suspended elements are free hanging between two fixed points. Nikrothal (NiCr) alloys are most suitable as they have better hot strength and are able to support their own weight.
Fully Supported elements are held up along the entire length of the heating element and do not require as much hot strength. Kanthal (FeCrAl) alloys work well in these applications and have the added benefit of higher maximum operating temperatures.
Embedded elements are completely encapsulated in some type of bedding compound. Both Nikrothal and Kanthal alloys are suitable for these applications.
3. Operating atmosphere
Most of the data provided by Kanthal regarding our alloy performance assumes that the elements will be operating in still air. Different atmospheres and air movement can dramatically affect the performance of the element material.
4. Watt loading on the surface of the wire
Watt loading of the element is the key for understanding what wire diameter is required for a specific element design. Kanthal Handbook for Resistance Heating Alloys for Electric Appliances provide reference watt loadings for various element types which can be used as a guide. You will find the handbook in the next right Documents tab.
5. Available power supply and required wattage
In order to understand the resistance necessary for a specific application you need to know the wattage output you require and the available voltage Ohm’s law can then be used to calculate the resistance. Resistance = volts2/watts. More details on Ohm’s law can be found in the Kanthal Appliance Handbook.
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