NiCr/NiCrFe Alloys – High-Performance Materials for Heating Elements and Resistors
Overview
NiCr (Nickel-Chromium) and NiCrFe (Nickel-Chromium-Iron) alloys are engineered for applications requiring high electrical resistance, excellent oxidation resistance, superior high-temperature tensile strength, and outstanding formability and weldability. These alloys are widely used in metallurgy, household appliances, and machinery for manufacturing heating elements, resistors, and other high-temperature components.
Key Advantages
High Electrical Resistance: Ideal for precision heating applications.
Exceptional Oxidation Resistance: Performs reliably in high-temperature environments.
Mechanical Strength at Elevated Temperatures: Maintains structural integrity under thermal stress.
Excellent Formability & Weldability: Facilitates easy fabrication into complex shapes.
Non-Magnetic Austenitic Structure: Suitable for sensitive electronic and industrial applications.
Technical Parameters of NiCr Alloys
Property / Type | Cr20Ni80 | Cr30Ni70 | Cr15Ni60 | Cr20Ni35 | Cr20Ni30 |
Main Composition (%) | |||||
Nickel (Ni) | Bal. | Bal. | 55.0–61.0 | 34.0–37.0 | 30.0–34.0 |
Chromium (Cr) | 22.0–23.0 | 28.0–31.0 | 15.0–18.0 | 18.0–21.0 | 18.0–21.0 |
Iron (Fe) | ≤1.0 | ≤1.0 | Bal. | Bal. | Bal. |
Max Service Temp. (°C) | 1200 | 1100 | 1000 | 1000 | 1000 |
Melting Point (°C) | 1400 | 1380 | 1390 | 1390 | 1390 |
Density (g/cm³) | 8.4 | 8.1 | 8.2 | 7.9 | 7.9 |
Resistivity (µΩ·m, 20°C) | 1.09±0.05 | 1.18±0.05 | 1.11±0.05 | 1.04±0.05 | 1.04±0.05 |
Elongation (%) | ≥20 | ≥20 | ≥20 | ≥20 | ≥20 |
Thermal Conductivity (kJ/m·h·°C) | 60.3 | 45.2 | 45.2 | 43.8 | 43.8 |
NiCr Round Wire Specifications
Diameter Range: 0.1 mm to 7.0 mm
Key Characteristics:
Linear Resistance: Tailored for precise electrical heating applications.
Weight per Meter: Optimized for material efficiency.
Non-Magnetic Properties: Ensures compatibility with sensitive environments.
Example Data for Cr20Ni80 (0.5 mm Diameter Wire):
Cross-Sectional Area: 0.1963 mm²
Weight per Meter: 0.001469 kg/m
Resistance per Meter (20°C): 5.551 Ω/m
Applications
Heating Elements: Industrial furnaces, household appliances (e.g., toasters, hair dryers).
Resistors: Precision electrical components.
High-Temperature Sensors: Thermocouples and instrumentation.
Aerospace & Automotive: Engine components and exhaust systems.
Why Choose NiCr/NiCrFe Alloys?
Reliability: Consistent performance under extreme thermal cycling.
Versatility: Adaptable to diverse industrial and consumer applications.
Cost-Effectiveness: Long service life reduces replacement frequency.
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