Hongtai-Knowledge of Heating Alloy Wire02

FeCrAl electric heating alloy

Jacky Jiang

Email: sales01@hongtaiheater.com

WhatsApp / Mob: +133 3895 8611

1. High temperature in the atmosphere
The maximum service temperature of iron chromium aluminum heating wire 0Cr27AL7Mo2 can reach 1400 ℃, while the maximum service temperature of nickel chromium wire Cr20Ni80 is 1200 ℃.

2. Long service life
Under the same use at a higher temperature in the atmosphere, the life of iron chromium aluminum can be 2-4 times that of nickel chromium.

3. High surface load
Because the iron-chromium aluminum alloy allows high temperature and long life, the surface load of the component can also be higher, which not only makes the temperature rise faster but also saves alloy materials.

4. Good oxidation resistance
The Al2O3 oxide film formed on the surface of the iron-chromium-aluminum alloy has a dense structure and good adhesion to the substrate, and it is not easy to scatter the flowing water and cause pollution. In addition, Al2O3 has a high resistivity and a high melting point. These factors determine that Al2O3 oxide film has excellent oxidation resistance. Carburization resistance is also better than Cr2O3 formed on the surface of nickel-chromium alloy.

5. Small proportion
Iron-chromium-aluminum alloys have a smaller specific gravity than nickel-chromium alloys, which means that the use of iron-chromium-aluminum when making equivalent components saves more material than nickel-chromium.

6. High resistivity
The resistivity of iron-chromium-aluminum alloy is higher than that of nickel-chromium alloy. When designing components, alloy materials with larger diameters can be selected, which is beneficial to prolong the service life of components, which is particularly important for thin alloy wires.

7. Good sulfur resistance
Iron chromium aluminum has good corrosion resistance to sulfur-containing atmospheres and surfaces contaminated with sulfur-containing substances, while nickel-chromium is severely corroded.

8. Cheap price
Iron-chromium aluminum is relatively cheaper than nickel-chromium because it does not contain scarce nickel.

9. The shortcomings of iron-chromium-aluminum alloy are low in high-temperature strength, and its plasticity increases as the temperature rises, which easily causes deformation of components.
Disadvantages of iron-chromium-aluminum electric heating alloys: mainly due to low high-temperature strength, its plasticity increases as the use temperature increases, and the components are easy to deform, not easy to bend and repair.


Nickel-chromium electric heating alloy

1. High temperature strength
The high-temperature strength of nickel-chromium alloy is higher than that of iron-chromium-aluminum, and it is not easy to deform when used at high temperature, and the arrangement of components is relatively large.

2. Its plasticity is still very good after long-term use
The nickel-chromium alloy will not become brittle after cooling down for a long time. Therefore, the heating element is more reliable and easy to repair after being damaged.

3. High emissivity
The fully oxidized nickel-chromium alloy has a higher emissivity than the iron-chromium aluminum alloy. Therefore, when the surface load is the same, the temperature of the nickel-chromium alloy element is slightly lower than that of the iron-chromium aluminum.

4. Non-magnetic
Nickel-chromium alloys are not magnetic, which is more suitable for some appliances used at low temperatures. Iron-chromium-aluminum alloys are non-magnetic only when they are above 600 ° C.

5. Better corrosion resistance
Nickel-chromium alloys are more corrosion-resistant than unoxidized iron-chromium aluminum alloys (except for sulfur-containing atmospheres and certain controlled atmospheres).

Disadvantages of nickel-chromium electrothermal alloy: Because it is made of scarce nickel metal materials, the price of this series of products is up to several times higher than that of iron-chromium-aluminum, and the use temperature is lower than that of iron-chromium-aluminum.