The 0Cr21Al4 iron-chromium-aluminum alloy bar is one of the most reliable and cost-efficient materials used in industrial heating applications. At DLX Alloy, we manufacture and supply 0Cr21Al4 bars with consistent composition, stable performance, and precise tolerance control. This alloy has become a popular choice for customers in furnace manufacturing, electric heating, and energy systems, where temperature stability and oxidation resistance are critical.
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0Cr21Al4 belongs to the FeCrAl alloy family—an iron-based alloy strengthened with chromium and aluminum. Its typical composition includes approximately 21% chromium and 4% aluminum, giving it excellent oxidation resistance, especially under long-term exposure to high temperatures. The aluminum forms a stable protective oxide layer (Al₂O₃) on the surface, preventing further scaling and degradation during continuous heating cycles.
This alloy demonstrates a strong balance between mechanical strength, oxidation resistance, and cost efficiency, which makes it suitable for medium-to-high temperature environments up to 1150°C.
Alloy Nomenclature Performance | 0Cr21Al6 | 0Cr21Al4 | 0Cr27Al7Mo2 | |||||
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) |
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0Cr21Al4 alloy bars are mainly used in electric heating and high-temperature furnace components, where they provide long life and stable resistance. Typical applications include:
Electric furnace heating elements and structural rods
Industrial dryers and air heaters
Metal sintering and heat treatment systems
Chemical plant heaters and reactors
Ceramic and glass manufacturing equipment
Household electric appliances (toaster, oven, dryer)
High-temperature laboratory furnaces
DLX Alloy provides both hot-rolled and cold-drawn 0Cr21Al4 bars in custom sizes, offering excellent formability and weldability for different applications.
Industry Analysis and Trends
The global demand for FeCrAl alloys like 0Cr21Al4 continues to rise as industries prioritize energy efficiency, low maintenance, and long-lasting materials. Electric heating systems are replacing fuel-based ones in manufacturing, and this trend drives the need for materials that can operate under continuous high temperatures with minimal oxidation.
In particular, the electric furnace, new energy battery heating, and environmental control industries are seeing rapid growth. 0Cr21Al4, with its stable structure and protective oxide layer, fits perfectly into these modern systems, especially where consistent temperature and energy conversion efficiency are essential.
At DLX Alloy, we’ve observed a significant increase in orders for 0Cr21Al4 bars from customers in industrial automation, thermal processing, and EV component manufacturing, as this alloy provides a durable and economical solution.
| Property | 0Cr21Al4 Alloy | 0Cr19Al3 | 0Cr21Al6 | 0Cr23Al5 |
|---|---|---|---|---|
| Chromium (Cr) Content | 21% | 19% | 21% | 23% |
| Aluminum (Al) Content | 4% | 3% | 6% | 5% |
| Max Operating Temp (°C) | 1150°C | 1000°C | 1250°C | 1300°C |
| Oxidation Resistance | Excellent | Good | Superior | Superior |
| Corrosion Resistance | High | Moderate | High | Very High |
| Strength at High Temp | Excellent | Good | Excellent | Excellent |
| Typical Structure | Ferritic | Ferritic | Ferritic | Ferritic |
| Applications | Heating elements, furnace parts | Industrial heaters | High-temp furnaces | Electric heating wires |
DLX Alloy has years of experience in FeCrAl alloy production, focusing on quality consistency and application-driven performance. We use vacuum melting and intermediate frequency furnaces to ensure uniform alloy composition and reduce impurities.
Our 0Cr21Al4 bars are manufactured using:
Advanced Drawing Equipment: Guarantees precise diameter and uniform surface.
Controlled Annealing Process: Improves ductility and dimensional stability.
Rigorous Quality Testing: Each batch undergoes mechanical, oxidation, and chemical composition testing before dispatch.
What sets DLX apart is our flexibility in customization. We can tailor chemical compositions (Cr and Al ratios), dimensions, and surface finish according to project specifications. Whether for mass production or prototyping, DLX ensures every product meets strict industrial standards.
Performance Comparison and Advantages
Compared with lower aluminum content alloys like 0Cr19Al3, 0Cr21Al4 provides improved oxidation resistance and higher working temperature capability. While more advanced alloys such as 0Cr23Al5 or 0Cr21Al6 offer slightly higher temperature resistance, they also come with increased production costs.
0Cr21Al4 offers a balanced solution—excellent oxidation resistance, strong mechanical stability, and reasonable pricing. It is particularly suitable for customers seeking efficient heat generation at moderate-to-high temperatures (900–1150°C).
DLX Alloy ensures that each bar maintains:
Tight tolerance control (±0.02mm)
Uniform surface oxide film after heat treatment
Strong anti-deformation performance under repeated heating cycles
Industry Outlook
The use of 0Cr21Al4 bars in heating systems aligns with the growing global push toward electrification and carbon reduction. As industries move toward smart manufacturing, electric heating is replacing gas-based or fuel-driven systems, creating more opportunities for FeCrAl materials.
In future developments, DLX plans to expand its production capacity for FeCrAl alloys and introduce enhanced alloys with niobium or molybdenum to improve oxidation resistance and strength further.
We are also focusing on global logistics and support, ensuring clients in Asia, Europe, and North America receive fast and reliable deliveries for both bulk orders and customized small batches.
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 maximum working temperature for 0Cr21Al4 bars?
They can operate continuously at temperatures up to 1150°C with excellent oxidation resistance.
2. What are the main alloying elements in 0Cr21Al4?
The key components are iron, chromium (21%), and aluminum (4%), forming a ferritic FeCrAl structure.
3. Is 0Cr21Al4 suitable for continuous heating applications?
Yes, it maintains stability during long-term heating, ideal for furnaces, heaters, and dryers.
4. What surface treatment does DLX apply?
Our bars are polished or bright-annealed, ensuring smooth surfaces and better oxidation control.
5. Can 0Cr21Al4 be welded or machined?
Yes. It can be easily welded and machined, though post-weld heat treatment is recommended to relieve stress.
6. How does it compare with 0Cr19Al3 or 0Cr25Al5?
It offers higher oxidation resistance than 0Cr19Al3 and better cost-efficiency than 0Cr25Al5, making it a balanced choice.
7. Does DLX provide custom lengths and diameters?
Absolutely. We offer bars from 2mm to 50mm diameter and custom lengths based on order requirements.
8. What testing methods are used before delivery?
Every batch undergoes tensile strength testing, metallographic examination, and oxidation life testing to ensure reliability.