0Cr21Al6 is a ferritic FeCrAl (iron-chromium-aluminum) alloy known for its exceptional high-temperature oxidation resistance, mechanical strength, and long service life under extreme thermal conditions. The composition—around 21% chromium and 6% aluminum—creates a strong, self-protective aluminum oxide film (Al₂O₃) on the surface when heated, preventing scaling and oxidation even beyond 1300°C. This property makes it one of the most durable heating and structural materials used in high-temperature industrial environments.
The alloy’s ferritic structure offers stable resistivity, good thermal conductivity, and magnetic properties that make it suitable for both electrical and mechanical applications. Compared to traditional stainless steels, 0Cr21Al6 delivers superior resistance to oxidation and sulfur corrosion, while maintaining structural integrity during long-term cyclic heating. It’s widely used in furnace components, electric heating elements, metallurgical equipment, and industrial heating systems that operate under continuous high-temperature exposure.
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Electric heating elements: Core material for heating rods, strips, and coiled elements in electric furnaces.
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Heat treatment equipment: Used for high-load rods, support bars, and fixtures inside industrial furnaces.
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Petrochemical industry: Applied in heaters and reactors that demand oxidation and corrosion resistance.
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Metallurgical processing: Performs well in smelting and sintering operations exposed to 1100–1350°C.
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Environmental equipment: Ideal for catalytic and thermal oxidizer systems.
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Electric thermal components: Used in resistance wires, bars, and tubes for industrial and household heating units.
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Alloy Nomenclature Performance |
0Cr21Al6 |
0Cr23Al5 |
0Cr21Al4 |
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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 |
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|
Fe |
Rest |
Rest |
Rest |
Rest |
Rest |
Rest |
Rest |
|
|
-- |
-- |
-- |
-- |
-- |
-- |
-- |
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Max.Continuous service temp. of element |
950 |
1250 |
1250 |
1250 |
1100 |
1350 |
1400 |
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|
Resistivity at 20C(μΩ.m) |
1.25 |
1.42 |
1.42 |
1.35 |
1.23 |
1.45 |
1.53 |
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|
Density(g/cm) |
7.4 |
7.1 |
7.16 |
7.25 |
7.35 |
7.1 |
7.1 |
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|
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 |
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Melting Point Approx(degree) |
1450 |
1500 |
1500 |
1500 |
1500 |
1510 |
1520 |
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Tensile Strength(N/mm) |
580-680 |
630-780 |
630-780 |
630-780 |
600-700 |
650-800 |
680-830 |
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Elongation at rupture(%) |
>16 |
>12 |
>12 |
>12 |
>12 |
>12 |
>10 |
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Variation of area(%) |
65-75 |
60-75 |
65-75 |
65-75 |
65-75 |
65-75 |
65-75 |
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Repeat Bending frequency(F/R) |
>5 |
>5 |
>5 |
>5 |
>5 |
>5 |
>5 |
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|
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 |
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Micrographic structure |
Ferrite |
Ferrite |
Ferrite |
Ferrite |
Ferrite |
Ferrite |
Ferrite |
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Magnetic properties |
Magnetic |
Magnetic |
Magnetic |
Magnetic |
Magnetic |
Magnetic |
Magnetic |
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Shape |
Size (mm) |
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Wire |
0.05-7.5 |
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Rod |
8-50 |
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Ribbon |
(0.05-0.35)*(0.5-6.0) |
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Strip |
(0.5-2.5)*(5-180) |
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The global heating materials market is moving toward long-life, energy-efficient, and corrosion-resistant alloys, with FeCrAl materials such as 0Cr21Al6 becoming the industry standard. As industries shift to electrification and automation, the need for materials capable of sustaining constant high-temperature operation without performance degradation has increased sharply.
At DLX Alloy, we see a strong trend among furnace and heater manufacturers toward adopting FeCrAl-based materials due to their cost-effectiveness compared to nickel-based alloys. 0Cr21Al6 stands out for its combination of mechanical strength, thermal stability, and affordability, which allows users to extend service cycles, reduce maintenance downtime, and improve system reliability.
DLX has optimized the melting and processing of 0Cr21Al6 using advanced vacuum induction furnaces and controlled atmosphere drawing equipment. This ensures uniform alloy composition and minimizes impurities, improving the alloy’s resistance to scaling and grain growth. The result is a FeCrAl bar that performs consistently under prolonged exposure to heat and oxidation.
Comparison Table
| Property | 0Cr21Al6 | 0Cr19Al3 | 0Cr23Al5 | 0Cr25Al5 |
|---|---|---|---|---|
| Main Elements | Fe-Cr-Al (21Cr, 6Al) | Fe-Cr-Al (19Cr, 3Al) | Fe-Cr-Al (23Cr, 5Al) | Fe-Cr-Al (25Cr, 5Al) |
| Max Operating Temp (°C) | 1350 | 1250 | 1400 | 1425 |
| Oxidation Resistance | Excellent | Very Good | Superior | Superior |
| Corrosion Resistance | Excellent | Excellent | Excellent | Excellent |
| Electrical Resistivity (μΩ·m) | 1.40 | 1.35 | 1.45 | 1.50 |
| Magnetic Properties | Ferritic | Ferritic | Ferritic | Ferritic |
| Mechanical Strength | High | Medium | High | High |
| Thermal Expansion | Low | Low | Low | Low |
DLX Company Advantage
DLX Alloy has become a trusted global supplier of FeCrAl materials, offering custom solutions tailored to high-temperature industries. Our 0Cr21Al6 alloy bars are produced using precision-controlled melting and rolling to achieve high purity and homogeneity. This ensures better performance stability during long-term use.
We offer a full range of diameters, shapes, and mechanical properties, providing flexibility for clients designing electric heating elements or furnace components. DLX also supports custom resistivity levels for different heating system requirements, giving manufacturers greater design control.
Another major strength is our quality inspection process. Each batch undergoes spectrochemical testing, tensile testing, and oxidation resistance evaluation. This ensures that every 0Cr21Al6 bar meets strict standards before delivery. Our clients benefit from consistent quality, fast delivery, and technical support to help them maximize alloy performance in high-temperature environments.
At DLX, we don’t just sell materials — we partner with clients to improve their overall thermal system efficiency and production reliability. Our decades of experience in FeCrAl development give us an edge in advising customers on alloy selection, design optimization, and performance improvement.
Article: 0Cr21Al6 – The Reliable FeCrAl Alloy for High-Temperature Operations
In modern industrial manufacturing, temperature control is crucial. Whether it’s in furnaces, smelters, or heating systems, the performance of the alloy used directly affects productivity and cost efficiency. Among the range of FeCrAl alloys, 0Cr21Al6 has gained a strong reputation as a reliable and cost-efficient solution for extreme temperature environments.
The alloy’s strength lies in its balanced composition—21% chromium enhances oxidation and corrosion resistance, while 6% aluminum forms a dense oxide layer that shields the surface from further degradation. This combination allows 0Cr21Al6 to maintain excellent stability even when exposed to air or oxidizing gases above 1300°C.
At DLX Alloy, we’ve focused on perfecting 0Cr21Al6 through advanced processing techniques that refine grain structure and ensure uniform resistivity. Our engineers understand that electric heating systems require long-lasting performance, especially under repetitive thermal cycling. The improved thermal fatigue resistance of 0Cr21Al6 means it can operate longer before replacement—reducing maintenance costs and downtime.
The industrial furnace sector in particular has seen strong growth in demand for FeCrAl alloys. Energy-efficient electric furnaces rely heavily on high-resistance materials that can withstand fluctuating temperatures without warping or oxidizing. The alloy’s low thermal expansion and stable resistivity make it ideal for heating rods, grids, and fixtures in both continuous and batch furnaces.
From a market perspective, the shift from fossil-fuel-based heating to electrified systems is fueling the demand for alloys like 0Cr21Al6. Sectors such as ceramics, metallurgy, and chemical processing now require materials that balance performance and cost while meeting stricter emission and energy standards.
Compared with nickel-based alloys, 0Cr21Al6 offers a similar level of oxidation resistance but at a much lower cost. This makes it particularly attractive to industries that need high-volume alloy components without sacrificing quality. DLX has capitalized on this trend by expanding its FeCrAl product line to include bars, wires, and strips designed specifically for long-term furnace operation and electric heating systems.
Our clients benefit from DLX’s custom production capability, including variable resistivity, precision machining, and surface finishing. Each product is backed by detailed test data to ensure traceability and performance reliability. The feedback from global customers has been overwhelmingly positive—highlighting improved heating uniformity, reduced oxidation loss, and extended lifespan in harsh working environments.
Looking ahead, the global high-temperature alloy market will continue growing as industries seek sustainable and efficient heating technologies. DLX Alloy is committed to advancing FeCrAl materials like 0Cr21Al6 to meet the evolving needs of modern manufacturing. Through innovation, quality control, and customer collaboration, DLX continues to deliver high-performance materials that stand the test of time and temperature.
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 are the main benefits of 0Cr21Al6 alloy bars?
They offer excellent oxidation resistance, high mechanical strength, and stable resistivity under prolonged high-temperature use.
2. What is the maximum service temperature?
0Cr21Al6 can perform reliably up to 1350°C in continuous operation.
3. How does it differ from 0Cr19Al3?
It contains higher chromium and aluminum, providing greater oxidation resistance and longer lifespan.
4. Is 0Cr21Al6 suitable for electric heating elements?
Yes, it’s one of the most reliable materials for electric furnaces and heating components.
5. What is the typical resistivity of the material?
Around 1.40 μΩ·m, offering stable electrical performance during operation.
6. Can DLX customize the product size and specification?
Absolutely. DLX provides customized diameters, lengths, and mechanical properties based on client needs.
7. What production methods does DLX use?
DLX uses vacuum melting, precise hot rolling, and controlled atmosphere drawing to ensure purity and consistency.
8. How does DLX ensure quality control?
Every batch is tested for chemical composition, tensile strength, and oxidation resistance before shipping.