0Cr21Al4
0Cr21Al4 (Chinese standard designation) is a Fe-Cr-Al alloy designed for electric heating applications. Renowned for its high resistivity, excellent high-temperature oxidation resistance, and stable thermal performance, this alloy leverages the synergistic effects of chromium (Cr) and aluminum (Al) to ensure long-term reliability in extreme environments. It is widely used in industrial heating systems, household appliances, and high-temperature furnaces.
Electric Heating Alloy 0Cr21Al4 Product Overview
(High-Resistance, High-Temperature Resistant, Oxidation-Resistant Heating Material)
Product Overview
0Cr21Al4 (Chinese standard designation) is a Fe-Cr-Al alloy designed for electric heating applications. Renowned for its high resistivity, excellent high-temperature oxidation resistance, and stable thermal performance, this alloy leverages the synergistic effects of chromium (Cr) and aluminum (Al) to ensure long-term reliability in extreme environments. It is widely used in industrial heating systems, household appliances, and high-temperature furnaces.
Performance Advantages
High-Temperature Oxidation Resistance
Forms a dense protective layer of Al₂O₃ and Cr₂O₃ oxides at elevated temperatures, significantly reducing oxidation and corrosion to extend service life.
High Resistivity & Thermal Stability
Stable resistivity across temperature ranges ensures efficient energy conversion. Low thermal expansion coefficient (14×10⁻⁶/°C) minimizes thermal stress and cracking risks.
Corrosion Resistance
Performs well in sulfur- and carbon-rich atmospheres, suitable for harsh industrial environments.
Processability
Cold Working: Supports cold drawing, bending, and shaping.
Welding: Requires TIG welding or resistance welding to avoid brittleness.
Typical Applications
Industrial Heating: Heating elements for electric furnaces, resistance strips, and high-temperature melting furnaces.
Household Appliances: Heating components in water heaters, ovens, and irons.
Specialized Equipment: Glass kilns, ceramic sintering furnaces, and heat treatment systems.
Automotive & Sensors: Exhaust gas sensors, hot air circulation systems.
Usage Guidelines
Temperature Limits
Avoid prolonged operation above 1250°C to prevent oxide layer degradation.
Installation
Allow thermal expansion gaps to reduce mechanical stress.
Environment
Use caution in strongly reducing atmospheres (e.g., H₂, CO).
Product Specifications & Services
Forms
Wire, strip, flat wire, round bar (custom sizes available).
Surface Treatment
Bright annealing or oxidized finish options.
Support
Technical guidance, lifespan evaluation, and failure analysis services.
Choose 0Cr21Al4 Alloy for Efficient, Durable, and Reliable Heating Solutions!
Contact us for technical datasheets, samples, or customized requirements.
Note: Data based on Chinese Standard GB/T 1234-2012. Actual performance may vary slightly due to manufacturing conditions. Consult our engineers for application-specific recommendations.
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Key Characteristics
| Chemical Composition (Typical Values) | |
| Chromium (Cr) | 20.0%~23.0% |
| Aluminum (Al) | 3.5%~5.0% |
| Iron (Fe) | Balance |
| Trace Elements | Carbon (C) ≤0.06%, Silicon (Si) ≤0.7%, Manganese (Mn) ≤0.7% |
| Physical Properties | |
| Resistivity (20°C) | 1.40~1.50 μΩ·m |
| Density | 7.1 g/cm³ |
| Melting Point | ~1450~1500°C |
| Maximum Operating Temperature | 1250°C (recommended long-term use ≤1150°C) |
| Mechanical Properties | |
| Tensile Strength | ≥600 MPa |
| Elongation (Room Temperature) | ≥15% |
| Hardness (HV) | ≤200 |
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