The 0Cr21Al4 FeCrAl rod is a high-performance material designed for demanding heating environments where stability, oxidation resistance, and long life are essential. DLX Alloy produces and supplies 0Cr21Al4 rods that deliver consistent performance for electric furnaces, heating equipment, and thermal processing systems. With advanced manufacturing and strict quality control, our products have become a reliable choice for global customers looking for durable and cost-effective heating alloys.
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0Cr21Al4 belongs to the iron-chromium-aluminum (FeCrAl) alloy family, known for its excellent oxidation resistance and thermal durability. It typically contains 21% chromium and 4% aluminum, which together form a dense and stable oxide layer (Al₂O₃) on the surface during high-temperature operation. This protective layer prevents further oxidation and allows the rod to maintain integrity even under prolonged heating cycles.
The alloy’s ferritic structure provides high strength, good ductility, and stable resistivity, making it a top material choice for electric heating systems that operate up to 1150°C. It performs well in both oxidizing and sulfur-containing environments, ensuring long service life and steady electrical performance.
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Alloy Nomenclature Performance |
1Cr13Al4 |
0Cr21Al6 |
0Cr23Al5 |
0Cr21Al4 |
0Cr27Al7Mo2 |
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|
Chemical Compostion (%) |
Cr |
12.0-15.0 |
23.0-26.0 |
19.0-22.0 |
20.5-23.5 |
18.0-21.0 |
21.0-23.0 |
26.5-27.8 |
|
Al |
4.0-6.0 |
4.5-6.5 |
5.0-7.0 |
4.2-5.3 |
3.0-4.2 |
5.0-7.0 |
6.0-7.0 |
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|
Re |
Opportune |
Opportune |
Opportune |
Opportune |
Opportune |
Opportune |
Opportune |
|
|
Fe |
Rest |
Rest |
Rest |
Rest |
Rest |
Rest |
Rest |
|
|
-- |
-- |
-- |
-- |
-- |
-- |
-- |
||
|
Max.Continuous service temp. of element |
950 |
1250 |
1250 |
1250 |
1100 |
1350 |
1400 |
|
|
Resistivity at 20C(μΩ.m) |
1.25 |
1.42 |
1.42 |
1.35 |
1.23 |
1.45 |
1.53 |
|
|
Density(g/cm) |
7.4 |
7.1 |
7.16 |
7.25 |
7.35 |
7.1 |
7.1 |
|
|
Thermal Conductivity(KJ/m.h) |
52.7 |
46.1 |
63.2 |
60.2 |
46.9 |
46.1 |
-- |
|
|
Coefficient of lines expansion(αx10-6/℃) |
15.4 |
16 |
14.7 |
15 |
13.5 |
16 |
16 |
|
|
Melting Point Approx(degree) |
1450 |
1500 |
1500 |
1500 |
1500 |
1510 |
1520 |
|
|
Tensile Strength(N/mm) |
580-680 |
630-780 |
630-780 |
630-780 |
600-700 |
650-800 |
680-830 |
|
|
Elongation at rupture(%) |
>16 |
>12 |
>12 |
>12 |
>12 |
>12 |
>10 |
|
|
Variation of area(%) |
65-75 |
60-75 |
65-75 |
65-75 |
65-75 |
65-75 |
65-75 |
|
|
Repeat Bending frequency(F/R) |
>5 |
>5 |
>5 |
>5 |
>5 |
>5 |
>5 |
|
|
Hardness(H.B.) |
200-260 |
200-260 |
200-260 |
200-260 |
200-260 |
200-260 |
200-260 |
|
|
continuous service time(Hours/ ºC) |
-- |
≥80/1300 |
≥80/1300 |
≥80/1300 |
≥80/1250 |
≥80/1350 |
≥80/1350 |
|
|
Micrographic structure |
Ferrite |
Ferrite |
Ferrite |
Ferrite |
Ferrite |
Ferrite |
Ferrite |
|
|
Magnetic properties |
Magnetic |
Magnetic |
Magnetic |
Magnetic |
Magnetic |
Magnetic |
Magnetic |
|
|
Shape |
Size (mm) |
|
Wire |
0.05-7.5 |
|
Rod |
8-50 |
|
Ribbon |
(0.05-0.35)*(0.5-6.0) |
|
Strip |
(0.5-2.5)*(5-180) |
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0Cr21Al4 FeCrAl rods are widely used across industries where heating and oxidation resistance are crucial. The alloy performs exceptionally well in both industrial and domestic heating systems.
Main applications include:
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Electric furnace heating rods and components
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Industrial dryers and air heating systems
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Ceramic and glass sintering furnaces
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Metallurgical heat treatment equipment
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Electric heating elements and wire supports
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High-temperature kilns and incinerators
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Energy system heaters and reactors
At DLX Alloy, our 0Cr21Al4 rods are available in both hot-rolled and cold-drawn forms, with customized dimensions and surface treatments to meet diverse industrial requirements.
| Property | 0Cr21Al4 | 0Cr19Al3 | 0Cr21Al6Nb | 0Cr25Al5 |
|---|---|---|---|---|
| Chromium (Cr) | 21% | 19% | 21% | 25% |
| Aluminum (Al) | 4% | 3% | 6% + Nb | 5% |
| Max Operating Temp (°C) | 1150°C | 1000°C | 1250°C | 1300°C |
| Oxidation Resistance | Excellent | Good | Superior | Superior |
| Mechanical Strength | High | Moderate | Very High | High |
| Electrical Resistivity (µΩ·m) | 1.35 | 1.25 | 1.40 | 1.45 |
| Corrosion Resistance | Excellent | Moderate | Excellent | Excellent |
| Structure | Ferritic | Ferritic | Ferritic | Ferritic |
The demand for FeCrAl alloys such as 0Cr21Al4 is steadily growing as the world transitions toward electrification, renewable energy, and energy-efficient manufacturing systems. Electric furnaces and heating systems are replacing traditional fuel-burning setups due to their cleaner operation, higher energy efficiency, and easier control.
In this transformation, materials like 0Cr21Al4 play a critical role. Their ability to withstand high temperatures while maintaining oxidation stability ensures both energy efficiency and long service life, reducing downtime and maintenance costs.
Industries such as automotive, aerospace, new energy, and metallurgy increasingly use FeCrAl rods in high-precision heating processes—especially for battery production, 3D printing, and electronic component manufacturing.
At DLX Alloy, we have observed growing global interest from customers seeking sustainable and long-lasting heating materials. The 0Cr21Al4 FeCrAl rod perfectly fits these requirements by balancing performance, durability, and cost.
DLX Alloy’s Production Advantages
DLX Alloy is dedicated to producing high-quality FeCrAl materials with precision and reliability. Our manufacturing facility uses vacuum melting furnaces and intermediate frequency furnaces to achieve chemical uniformity and purity. Each batch undergoes precision drawing and controlled annealing, ensuring stable microstructure and accurate dimensions.
Our production advantages include:
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Stable Alloy Composition: Strict control of chromium and aluminum ratios guarantees consistent oxidation resistance.
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Excellent Surface Quality: Smooth and bright finishes improve heating performance and assembly compatibility.
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Custom Specifications: DLX can produce rods in various diameters, lengths, and tolerance levels to match customer equipment.
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Comprehensive Testing: Every product is tested for tensile strength, oxidation resistance, and dimensional precision.
We also provide custom alloy modifications with elements such as niobium or molybdenum to enhance high-temperature performance or oxidation resistance further, depending on the end-use environment.
Performance Comparison and Advantages
Compared with other ferritic FeCrAl alloys, 0Cr21Al4 offers an excellent balance of performance and economy. For moderate to high temperature applications (900–1150°C), it delivers outstanding oxidation stability without the higher cost of more alloyed materials.
| Feature | 0Cr21Al4 Advantage |
|---|---|
| Temperature Range | Suitable for continuous heating up to 1150°C |
| Oxidation Resistance | Forms stable aluminum oxide film for long life |
| Cost Efficiency | More affordable than higher alloyed FeCrAl grades |
| Mechanical Strength | High stability and low creep deformation |
| Customizability | Easily tailored for different furnace applications |
For electric furnaces and heating systems that require a long service cycle and low maintenance, 0Cr21Al4 is one of the most durable and practical choices available.
The FeCrAl material market continues to expand, particularly in Asia and Europe, where industries are modernizing thermal systems to meet energy standards. Electric heating is a key component in carbon-neutral manufacturing strategies, and materials like 0Cr21Al4 are enabling this transformation.
DLX Alloy aims to stay ahead by offering global logistics support, technical consultation, and quick delivery for both large-scale and custom projects. Our long-term partnerships with engineering and manufacturing companies reflect our commitment to quality and innovation.
As new technologies like battery thermal management, solar power equipment, and electric furnaces for clean metallurgy evolve, DLX will continue developing advanced FeCrAl products to meet these challenges.
About Us:
Our 12,000㎡ factory is equipped with complete capabilities for research, production, testing, and packaging. We strictly adhere to ISO 9001 standards in our production processes, with an annual output of 1,200 tons. This ensures that we meet both quantity and quality demands. Furthermore, all products undergo rigorous simulated environment testing including high temperature, high pressure, and corrosion tests before being dispatched, ensuring they meet customer specifications.For all our clients, we offer timely and multilingual after-sales support and technical consulting, helping you resolve any issues swiftly and efficiently.
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FAQs
1. What is the working temperature range for 0Cr21Al4 rods?
It can operate continuously between 900°C and 1150°C while maintaining oxidation stability.
2. What are the main alloying elements?
The alloy consists mainly of iron, chromium (21%), and aluminum (4%), forming a ferritic FeCrAl structure.
3. How does 0Cr21Al4 compare to 0Cr25Al5?
It offers slightly lower oxidation resistance but better cost efficiency and easier processing.
4. Can DLX provide custom sizes and surface finishes?
Yes. DLX offers rods from 2mm to 50mm diameter and can supply polished, pickled, or bright-annealed surfaces.
5. Is 0Cr21Al4 corrosion resistant?
Yes, the protective oxide layer also improves corrosion resistance in oxidizing and mild sulfur-containing environments.
6. Can it be welded or machined easily?
Yes. It can be welded and machined using standard ferritic alloy techniques with appropriate post-processing.
7. What testing does DLX perform before shipment?
Every batch undergoes mechanical, metallographic, and oxidation resistance testing to ensure product reliability.
8. Which industries most commonly use 0Cr21Al4 rods?
Electric furnace manufacturing, metal heat treatment, ceramics, chemical processing, and new energy sectors.