CrAl 20/3
Resistance alloys and resistance heating alloys
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Cr20-Al3 is a FeCrAl alloy with high resistivity suitable for use at temperatures up to 1100°C. Due to the formation of Al2O3 on the surface of base metal, it has high oxidation resistance, thermal strength and low temperature coefficient.
| C % | Si % | Mn % | Cr % | Al % | Fe % | |
|---|---|---|---|---|---|---|
| Min | – | – | – | 18.0 | 3.0 | Bal. |
| Max | 0.08 | 0.50 | 0.50 | 21.0 | 4.2 |
|
Density g/cm3
|
7.35 |
|
Electrical resistivity at 20°C Ω mm2/m
|
1.23 |
|
Melting point °C
|
1500 |
|
Max continuous operating temperature in air °C
|
1100 |
|
Specific heat capacity kJ kg-1 K-1
|
0.490 |
|
Thermal conductivity
|
13.0 |
|
Coefficient of thermal expansion 20-1000 °C 10-6/K |
13.5 |
|
Magnetic property
|
magnetic |
| °C | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900 | 1000 | 1100 | 1200 |
| Ct | 1.011 | 1.025 | 1.042 | 1.061 | 1.085 | 1.120 | 1.142 | 1.154 | 1.164 | 1.172 | 1.180 | 1.186 |
| Wire | Tensile strength | Elongation |
| Ø | Rm | A |
| mm | MPa | % |
| 3 | 600 | 15 |