Kanthal® A1
Kanthal A1 is designed for the most demanding electric heating applications
Other name: Alloy 875
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Highest maximum temperature for metallic alloy
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Best protective alumina surface oxide layer for longer life
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Call us if you want to have the wire coiled
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Shipping
Quick delivery in 7 days within US and no hassle returns
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Application Areas
Heat treating Furnaces, Kilns, Quartz tube heaters
Hot Strength
Maximum Temperature
Ductility
Temperature Coefficient Stability
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Product information
- Max Temp : 2550°F / 1400° C
- Element Life : Excellent
- Temperature Coefficient Stability : Very Good
- Oxidation Properties : Excellent
- Suitability For Suspended Elements : Not suitable
- Ductility After Use : Low
- Weldability After Use : Difficult
Kanthal® A-1 is a ferritic iron-chromium-aluminium alloy (FeCrAl alloy) for use at temperatures up to 1400°C (2550°F). The alloy is characterized by high resistivity and very good oxidation resistance. Typical applications for Kanthal® A-1 are electrical heating elements in high-temperature furnaces for heat treatment, ceramics, glass, steel, and electronic industries.
Chemical composition
C % Si % Mn % Cr % Al % Fe % †Nominal composition 5.8 Bal. Min - - - 20.5 - Max 0.08 0.7 0.4 23.5 - Mechanical properties
Wire size Yield strength Tensile strength Elongation Hardness Ø Rp0.2 Rm A mm (in) MPa (ksi) MPa (ksi) % Hv 1.0 (0.04) 545 (79) 760 (110) 20 240 4.0 (0.16) 475 (69) 680 (99) 18 230 MECHANICAL PROPERTIES AT ELEVATED TEMPERATURE
Temperature °C 900 1000 1100 1200 1300 Temperature °F 1652 1832 2012 2192 2372 MPa 34 18 10 6 4 ksi 4.9 2.6 1.5 0.9 0.6 Creep strength - 1% elongation in 1000 h
Temperature °C 800 1000 Temperature °F 1472 1832 MPa 1.2 0.5 psi 170 73 Physcial properties
Density g/cm3 (lb/in3) 7.15 (0.258) Electrical resistivity at 20°C Ω mm2/m (Ω circ. mil/ft) 1.39 (836) Poisson's ratio 0.30 Young's modulus
Temperature °C 20 100 200 400 600 800 1000 Temperature °F 68 212 392 752 1112 1472 1832 GPa 220 210 205 190 170 150 130 Msi 32 30 30 28 25 22 19 TEMPERATURE FACTOR OF RESISTIVITY
Temperature °C 100 200 300 400 500 600 700 800 900 1000 Temperature °F 212 392 572 752 932 1112 1292 1472 1652 1832 Ct 1 1.01 1.01 1.02 1.03 1.04 1.04 1.05 1.05 1.06 COEFFICIENT OF THERMAL EXPANSION
Temperature °C (°F) Thermal Expansion x 10-6/K (10-6 /°F) 20 - 250 (68-482) 11 (6.1) 20 - 500 (68-932) 12 (6.7) 20 - 750 (68-1382) 14 (7.8) 20 - 1000 (68-1832) 15 (8.3) THERMAL CONDUCTIVITY
Temperature °C 50 600 800 1000 1200 Temperature °F 122 1112 1472 1832 2192 W m-1 K-1 11 20 22 26 27 Btu h-1ft-1°F-1 6.4 11.6 12.7 15 15.6 SPECIFIC HEAT CAPACITY
Temperature °C 20 200 400 600 800 1000 1200 Temperature °F 68 392 752 1112 1472 1832 2192 kJ kg-1 K-1 0.46 0.56 0.63 0.75 0.71 0.72 0.74 Btu lb-1 °F-1 0.11 0.13 0.15 0.18 0.17 0.17 0.18 Melting point °C (°F) 1500 (2732) Max continuous operating temperature in air °C (°F) 1350 (2462) Magnetic properties The material is magnetic up to approximately 600°C (1112°F) (Curie point). Emissivity - fully oxidized material 0.7 Resistivity vs. temperature chart for KANTHAL A1 and other KANTHAL alloys
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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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Documents & certificates
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Related services
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Sustainability
By fully integrating sustainability into our offerings and operations, we believe that we create a solid basis for conducting profitable and responsible business, now and in the future.
Looking at climate change we have activities scheduled globally within SMT to 2023 with improvement of nearly 25% CO2 reduction.
we have an average today of 84% recycled material in the steel we make.
Our KanthalAward, is also one channel through which we contribute to sustainability by combining it together with tech innovation.
To achieve this, we are focusing on four sustainability goals for 2030
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