FeCrAl alloy is very common in electric heating field.

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Because it has many advantages, of course it also has disadvantages,let study it.

Advantages:

1,The use temperature in the atmosphere is high.

The maximum service temperature of HRE alloy in iron-chromium-aluminum electrothermal alloy can reach &#;, while that of Cr20Ni80 alloy in nickel-chromium electrothermal alloy can reach &#;.

2,Long service life

Under the same high service temperature in the atmosphere, the life of Fe-Cr-Al element can be 2-4 times longer than that of Ni-Cr element.

3,High surface load

Because Fe-Cr-Al alloy allows high service temperature and long service life, the component surface load can be higher, which not only makes the temperature rise faster, but also saves alloy materials.

4,Good oxidation resistance

The Al2O3 oxide film structure formed on the surface of Fe-Cr-Al alloy is compact, has good adhesion with the substrate, and is not easy to cause pollution due to scattering. In addition, Al2O3 has high resistivity and melting point, which determines that Al2O3 oxide film has excellent oxidation resistance. The carburizing resistance is also better than Cr2O3 formed on the surface of Ni-Cr alloy.

5,Small specific gravity

The specific gravity of Fe-Cr-Al alloy is smaller than that of Ni-Cr alloy, which means that it is more economical to use Fe-Cr-Al alloy than Ni-Cr alloy when making the same components.

6,High resistivity

The resistivity of Fe-Cr-Al alloy is higher than that of Ni-Cr alloy, so larger alloy materials can be selected when designing components, which is beneficial to prolong the service life of components, especially for fine alloy wires. When materials with the same specifications are selected, the higher the resistivity, the more material will be saved, and the smaller the position of components in the furnace will be. In addition, the resistivity of Fe-Cr-Al alloy is less affected by cold working and heat treatment than that of Ni-Cr alloy.

7,Good sulfur resistance

Iron, chromium and aluminum have good corrosion resistance to sulfur-containing atmosphere and when the surface is polluted by sulfur-containing substances, while nickel and chromium will be seriously eroded.

8,Cheap price

Iron-chromium-aluminum is much cheaper than nickel-chromium because it does not contain scarce nickel.

Disadvantages:

1,Low strength at high temperature

Its plasticity increases with the increase of temperature. When the temperature is above &#;, the material will slowly stretch due to its own weight, which will cause the deformation of the element.

Contact us to discuss your requirements of Resistance Heating Alloy. Our experienced sales team can help you identify the options that best suit your needs.

2,Easy to get big brittleness

After being used at high temperature for a long time and cooled in the furnace, it becomes brittle as the grain grows, and it cannot be bent in cold state.

3, Magnetic

Fecral alloy will be non-magnetic over 600°C.

4, Corrosion resistance is weaker than nicr alloy.

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We can produce about 200 tons fecral alloy products, if you need, please feel free to contact us.

High Resistance Alloy Resistive Exothermic wire - High Temperature

Resistance Wire, also known as alloy heating wire, is the source of heat for electric heating elements&#; are used for the manufacture of heating elements, thermocouples and a range of highly demanding high temperature applications.

Our high resistance electric heating alloy is stable in performance, allowing high surface load, having small specific gravity and stable co-efficiency in temperature and a high working temperature with maxim of °C. Besides, we have twelve different kinds of alloys, each type has its own temperature ranges and resistivity.

We can also supply other products according to your requirement, coiled wires, wave-shaped wires and different kinds of standard or non-standard electrical heating elements.

Comparison of FeCrAl and NiCr

Ferrum-Chromium-Aluminium (FeCrAl) alloys

Main advantages: The operating temperature of FeCrAl alloy is high and it can reach as high as °C. (0Cr21A16Nb, 0Cr27A17Mo2, etc.) While it has a long lifespan, it also has a high surface load. Additionally, it is characterized by exceptionally good oxidation resistance, high resistivity, cheap prices, etc.

Main disadvantages: It is mainly exhibited in its low strength under high-temperature environment. With the rise of its operating temperature, its ductility soars resulting in the components to be easily deformed. Furthermore, the components cannot be readily bent and repaired.

Nickel-Chromium (NiCr) alloys

Main advantages: Notwithstanding its high strength relative to FeCrAl alloy, it is not easily deformed under high temperature. In addition, its structure is also not readily changed while it has comparatively better ductility. Moreover, it also has a high radiation and it is non-magnetic in nature. On top of that, it is corrosion resistance and it also has a long lifespan.

Main disadvantages: As it is made from the scarce nickel metals, the prices of its series of products are higher up to a few times that of FeCrAl alloy. Besides, its operating temperature is lower than that of the FeCrAl alloy.

Commonly Used types

• Ni80Cr20 - Usually called nickel-chromium wire, non-magnetic, often used in the manufacture of single-ended electric heating elements and high-power density electric heating elements. Nickel-chromium wire has good mechanical properties, good stability at high temperatures and does not oxidize when charged in the air.
• 0Cr25Al5 - Usually called iron-chromium wire, magnetic, relatively cheap, widely used in electric Heaters, Iron-chromium wire is easily oxidized in air by electricity, more brittle.
• Other Grades

Cr15Ni60 and Cr20Ni30 nickel-chromium-iron alloy are more widely used high-resistance electric heating alloys. They have high resistivity, good oxidation resistance, wear resistance, mechanical processing, and welding properties, as well as more resilient at high temperatures. The alloys are suitable for metallurgy, chemical industry, machinery, glass, Ceramics, household appliances and other industrial sectors to manufacture heat generating elements, various types of motor voltage regulating resistors and braking resistors.

PTC thermistor Alloy Wire &#; possess medium resistance rate, high positive resistance temperature coefficient. The material is widely used in a variety of electric heaters with automatic temperature control. Some of its advantages include automatic power regulation, constant current, current limiting, energy saving, long practical life and many others. Resistance temperature coefficient TCR:0-100&#;-6&#;(-) x 10/&#;, resistivity: 0-100&#; 0.20-0.38μ Ω.m.

How to choose resistance heating wire

How to choose the best material and diameter for the resistance heating wire on their applications, or how to choose the best product that has relatively higher price-performance ratio under the appropriate working environment and usage requirements. We will discuss with everyone the methods to be used for choosing the best resistance heating wire in the following section.

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