Overview
0Cr21Al6Nb is a high-resistance electric heating alloy, belonging to the iron-chromium-aluminum alloy system. It features high electrical resistivity, excellent oxidation resistance, and good creep resistance, making it suitable for manufacturing electric heating elements in high-temperature environments. The alloy forms a dense Al2O3 oxide film at high temperatures, effectively preventing oxidation and corrosion, with a maximum operating temperature of up to 1100°C. Additionally, it has a low temperature coefficient, allowing it to maintain stable resistance values at different temperatures.
Limiting Chemical Composition, %
Chromium..............................................................................................................................................................................21.0--23.0
Aluminum..................................................................................................................................................................................5.0--7.0
Carbon.....................................................................................................................................................................................0.05 Max.
Nickel........................................................................................................................................................................................0.60 Max.
Silicon.......................................................................................................................................................................................0.60 Max.
Manganese.............................................................................................................................................................................0.70 Max.
Phosphorus...........................................................................................................................................................................0.025 Max.
Sulfur.......................................................................................................................................................................................0.025 Max.
Niobium...................................................................................................................................................................................0.50
Iron...............................................................................................................................................................................................Balance.
Physical Constants
Density | 7.1 g/cm³ |
Resistivity | 1.45 μΩ·m |
Tensile strength | ≥650 Mpa |
Bending frequency | ＞5 |
Melting piont | 1500℃ |
Elongation | ＞10% |
Characteristic
High resistivity: Suitable for resistance heating elements at high temperatures.
Excellent oxidation resistance: forming a dense Al2O3 oxide film at high temperature, effectively preventing oxidation and corrosion.
Good creep resistance: the addition of niobium improves the creep resistance and high temperature strength of the alloy.
Low temperature coefficient: The resistance value changes little with temperature, and the temperature coefficient is 0 ~ -0.01%/℃.
Metallographic structure: ferrite structure.
Application
Electric heating element: widely used in electric furnace heating element, electric heat pipe, electric heating wire, etc.
Industrial heating equipment: such as heat treatment furnace, stainless steel annealing furnace, etc.
Melting device: Used to manufacture melting crucible, furnace, furnace and so on.
