FeCrAl Cr21Al16Nb wire bar strip

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

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.