The 0Cr21Al6 Nb FeCrAl rod is a high-strength ferritic heating alloy specifically engineered for long-term operation in electric furnaces and industrial heating systems. It is composed mainly of iron (Fe), chromium (Cr ≈ 21%), aluminum (Al ≈ 6%), and a small but vital amount of niobium (Nb). The addition of niobium gives this material enhanced mechanical strength, oxidation resistance, and thermal stability compared to conventional FeCrAl alloys.
At DLX Alloy, we produce 0Cr21Al6Nb FeCrAl rods using vacuum melting, controlled forging, and precise rolling processes. This ensures consistent quality, tight tolerance, and a fine-grain structure that performs reliably in high-temperature environments above 1300°C.
The alloy’s primary advantage lies in the formation of a dense aluminum oxide (Al₂O₃) film when heated, which acts as a protective layer against oxidation. The niobium addition refines the grain boundaries, strengthens the matrix, and minimizes creep deformation, resulting in a longer service life in continuous or cyclic heating applications.
For more details, pls directly contact us
The 0Cr21Al6Nb FeCrAl rod is widely used across industrial sectors that require durable, oxidation-resistant heating materials. Typical applications include:
-
Electric furnaces used in metallurgy, ceramics, and glass industries
-
Resistive heating elements for kilns, ovens, and dryers
-
Continuous heat treatment equipment for manufacturing processes
-
Industrial heating tubes and radiant heaters
-
Laboratory furnaces and thermal simulation systems
Because of its strong combination of oxidation resistance, thermal fatigue durability, and mechanical integrity, this alloy is particularly suitable for continuous heating cycles and high-demand thermal environments.
|
Alloy Nomenclature Performance |
0Cr21Al6 |
0Cr23Al5 |
0Cr21Al4 |
|||||
|
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 |
|
|
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) |
For more details, pls directly contact us
As industries transition toward efficient, clean, and electrically powered heating technologies, materials that can withstand extreme heat with minimal degradation are in high demand. FeCrAl alloys, especially those modified with niobium, have emerged as leading materials for electric heating systems.
The trend is shifting from traditional NiCr-based heating alloys toward FeCrAl-Nb alloys due to their longer oxidation life, better strength-to-cost ratio, and reduced energy loss during operation. Manufacturers of electric furnaces, heating tubes, and industrial thermal systems increasingly prefer 0Cr21Al6Nb rods for their consistent resistivity, long service cycles, and excellent corrosion protection in oxidizing atmospheres.
DLX Alloy has recognized this shift early and invested in advanced production lines, microalloy control systems, and automated quality inspection. Our 0Cr21Al6Nb FeCrAl rods are designed to meet the performance standards required by modern energy-efficient heating systems used worldwide.
Product Comparison Table
| Property | 0Cr21Al6Nb | 0Cr21Al6 | 0Cr23Al5 | 0Cr25Al5 |
|---|---|---|---|---|
| Main Composition | Fe-Cr-Al-Nb | Fe-Cr-Al | Fe-Cr-Al | Fe-Cr-Al |
| Niobium Addition | 0.3–0.6% | – | – | – |
| Max Operating Temp (°C) | 1350 | 1300 | 1350 | 1400 |
| Oxidation Resistance | Excellent | Very Good | Excellent | Excellent |
| Mechanical Strength (1200°C) | High | Medium | High | Very High |
| Electrical Resistivity (μΩ·m) | 1.38 | 1.35 | 1.40 | 1.45 |
| Thermal Expansion Stability | Excellent | Good | Excellent | Excellent |
| Life Expectancy | Long | Moderate | Long | Long |
This table shows that 0Cr21Al6Nb offers an ideal balance between strength, cost, and oxidation resistance, outperforming most standard FeCrAl alloys in long-term thermal operations.
DLX Alloy – Our Competitive Advantage
At DLX Alloy, we specialize in developing and manufacturing high-performance FeCrAl-based materials for heating and resistance applications. Our 0Cr21Al6Nb FeCrAl rods are engineered for demanding industrial environments where durability and efficiency are essential.
Why DLX Alloy stands out:
-
Vacuum melting process ensures clean alloy composition and consistent structure.
-
Precision hot-rolling and controlled annealing guarantee uniform grain distribution and tight tolerance.
-
Comprehensive testing covers resistivity, oxidation performance, tensile strength, and microstructure.
-
Custom dimensions and formulations available to match unique industrial heating requirements.
-
Reliable supply chain and fast delivery to global clients.
We take pride in maintaining strict quality control from raw materials to finished products. Every DLX 0Cr21Al6Nb rod undergoes rigorous testing to ensure stability under long-term high-temperature exposure.
By combining advanced metallurgical design with precision manufacturing, DLX Alloy provides long-lasting, energy-efficient, and economically viable FeCrAl solutions trusted by international customers.
Market Insights
The industrial heating materials market is evolving quickly, with energy efficiency and sustainability at the forefront. As industries seek to lower carbon emissions and improve process reliability, FeCrAl-based heating alloys have gained global attention for their ability to deliver consistent thermal performance.
In particular, 0Cr21Al6Nb has become one of the most preferred materials for electric furnaces, sintering systems, and heat treatment lines. The niobium-enhanced design provides longer operational life, minimizing replacement frequency and downtime costs.
DLX Alloy continues to push material performance forward by refining oxide dispersion strengthening, alloy purity, and surface finish techniques. Our 0Cr21Al6Nb rods are not only used in traditional industrial settings but are also finding new roles in renewable energy systems, battery component processing, and advanced manufacturing where high-temperature stability is key.
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.
Client Visits
Building Stronger Partnerships
We support all kinds of testing:
FAQs
1. What makes 0Cr21Al6Nb different from regular FeCrAl alloys?
The addition of niobium significantly improves strength, oxidation resistance, and thermal fatigue performance, making it ideal for heavy-duty heating elements.
2. What is the maximum working temperature of this alloy?
It can operate continuously at up to 1350°C in oxidizing environments.
3. Why does DLX Alloy use vacuum melting for production?
Vacuum melting removes impurities like sulfur and oxygen, resulting in higher purity and more stable performance during high-temperature operation.
4. Is 0Cr21Al6Nb suitable for cyclic heating conditions?
Yes, its niobium addition and refined grain structure make it highly resistant to thermal fatigue from repeated heating and cooling cycles.
5. What industries use this alloy most commonly?
Metallurgy, ceramics, glass, energy, and thermal processing equipment manufacturers widely use it.
6. Can DLX customize the rod diameter and length?
Absolutely. DLX provides full customization, including dimensions, surface finish, and mechanical property adjustments.
7. How does it perform compared to NiCr alloys?
It offers a higher temperature limit, better oxidation stability, and lower cost, making it a preferred alternative in most heating systems.
8. How long is the typical lifespan of a DLX 0Cr21Al6Nb heating element?
Depending on the application, it can last 30–50% longer than standard FeCrAl materials due to its improved creep and oxidation resistance.
Conclusion
The 0Cr21Al6Nb FeCrAl rod represents the next step in the evolution of industrial heating materials. Its combination of high strength, enhanced oxidation resistance, and exceptional durability makes it ideal for electric furnaces and long-term heating element applications.
At DLX Alloy, we are committed to supplying the most reliable FeCrAl alloy solutions on the market. Our manufacturing expertise, quality consistency, and customization capabilities allow us to deliver products that exceed performance expectations in even the harshest operating environments.
As industries continue to move toward efficient and sustainable high-temperature systems, DLX Alloy’s 0Cr21Al6Nb rods stand out as the smart choice for professionals who demand strength, stability, and reliability in every heating component.