Cr20ni80 Wire
Cr20Ni80 is a classic Ni-Cr based heating alloy composed of 80% nickel (Ni) and 20% chromium (Cr). It combines exceptional high-temperature performance with stability, making it a core material in industrial heating applications.
Nickel-Chromium Electrical Heating Alloy Cr20Ni80 Product Introduction
Material Characteristics
Cr20Ni80 is a classic Ni-Cr based heating alloy composed of 80% nickel (Ni) and 20% chromium (Cr). It combines exceptional high-temperature performance with stability, making it a core material in industrial heating applications. Key advantages include:
High-Temperature Oxidation Resistance
Chromium forms a dense Cr₂O₃ oxide layer, enabling stable operation below 1200°C with superior oxidation resistance compared to low-chromium alloys (e.g., Cr15Ni60).
High Resistivity
Room-temperature resistivity ≈1.09 μΩ·m, significantly higher than iron-chromium-aluminum alloys (e.g., 0Cr27Al7Mo2), allowing compact heater designs.
Creep Resistance
Nickel matrix provides excellent high-temperature strength, offering 30%-50% longer service life than Fe-Cr-Al alloys under thermal cycling.
Cold Workability
Suitable for wire drawing and complex shaping with higher yield rates than high-chromium grades (e.g., Cr30Ni70).
Typical Applications
- • Industrial furnace/heating element wires/ribbons
- • Household appliance heating components (ovens, water heaters)
- • High-temperature lab equipment & glass melting systems
- • Specialized heating units in nuclear/aerospace sectors
Selection Guidelines
• Choose Cr20Ni80 for: Applications requiring balanced oxidation resistance, workability, and longevity at <1200°C.
• Alternatives:
Budget-sensitive low-temp. needs → Cr15Ni60
Ultra-high-temp. low-oxygen environments → Fe-Cr-Al alloys
Extreme corrosion resistance → Upgrade to Cr30Ni70
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Performance Comparison with Competing Materials
|
Property |
Cr20Ni80 |
Cr15Ni60 (Low-Cr Ni-based) |
0Cr27Al7Mo2 (Fe-Cr-Al) |
|
Max. Service Temp. (°C) |
1200 |
1150 |
1400 |
|
Resistivity (μΩ·m, 20°C) |
1.09 |
1.04 |
1.40 |
|
Oxidation Resistance (1200°C) |
Excellent (>2000h) |
Good (~1200h) |
Poor (scaling risk) |
|
Cold Workability |
Excellent |
Good |
Poor (brittle) |
|
Cost |
High |
Moderate |
Low |
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