Karma
Its resistivity is about three times higher than that of manganese copper, and it has a lower resistance temperature coefficient and a low thermoelectric potential against copper. It has good long-term resistance stability and oxidation resistance, and a wider operating temperature range.
It is suitable for making precision resistance elements in various measuring instruments and meters, as well as for making precision micro-resistance elements and strain gauges.
CHEMICAL COMPOSITION
C % | P % | S % | Mn % | Si % | Cr % | Ni % | Al % | Fe % | Other % |
3.2 | ≤0.01 | ≤0.01 | 0.5-1.5 | ≤0.2 | 19.0-21.5 | Bal. | 2.7-3.2 | 2.0-3.0 | - |
Mechanical properties
Max. continuous operating temp. | 300℃ |
Resistivity ( 20℃)/uΩ·m | 1.33 |
Density (g/cm3) | 8.1 |
Thermal Conductivity (KJ/m·h·℃) | 46 |
Melting Point (℃) | 1400 |
Elongation (%) | 10-20 |
Micrographic Structure | Austenite |
Magnetic Property | Nonmagnetic |
Temperature factor of electrical resistivity
20℃ | 100℃ | 200℃ | 300℃ | 400℃ | 500℃ | 600℃ | 700℃ | 800℃ | 900℃ | 1000℃ | 1100℃ | 1200℃ | 1300℃ |
1 | 1.007 | 1.016 | 1.028 | 1.038 | 1.044 | 1.036 | 1.030 | 1.028 | 1.029 | 1.033 | 1.037 | 1.043 | - |
