Cr20Ni80 Heating Alloy Wire
Professional supplier of Cr20Ni80 nickel-chromium heating alloy fine wire, diameter 0.08-3mm, with straightening and cutting customization available.
Material Overview
Cr20Ni80 is a classic nickel-chromium electric heating alloy known for its excellent high-temperature oxidation resistance and stable resistivity. It maintains strong mechanical properties and electrical stability at temperatures up to 1200°C, making it an ideal material for industrial resistance furnaces and home appliance heating elements.
Cr20Ni80 alloy wire is produced via electric arc or induction melting, followed by hot rolling, pickling, and cold drawing. The wire features a high surface finish with dimensional accuracy up to ±0.01mm and resistivity deviation within ±5%.
Chemical Composition and Physical Properties
Chemical Composition (Mass Fraction, %) of Cr20Ni80 Alloy Wire
| Element | Content Range |
|---|---|
| Hi | 78.0-81.0 |
| Cr | 19.0-21.0 |
| Fe | ≤1.00 |
| Yes | ≤0.80 |
| Mn | ≤0.60 |
| C | ≤0.10 |
Physical properties of Cr20Ni80 alloy wire
Resistivity (20°C)
1.09 Ω·mm²/m
Temperature Coefficient of Resistance
≤100×10⁻⁶/°C
Density
8.40 g/cm³
Melting point
1350-1400°C
Maximum Operating Temperature
1200°C (in air)
Available Wire Specifications
Wire diameter range
0.08mm - 3.0mm
Delivery Status
Hard-drawn (cold-drawn) / Annealed
Packaging Format
Coiled / Straight (Cut-to-Length)
Execution Standard
GB/T 1234
Core Product Advantages
High-temperature oxidation resistance
Forms a dense Cr₂O₃ oxide layer that effectively resists high-temperature oxidation and corrosion.
Stable resistivity
Low temperature coefficient of resistivity; stable and reliable resistance value for long-term use.
Long service life
Rated for thousands of hours at nominal temperature with excellent cost-effectiveness
Excellent machinability
Excellent hot and cold workability; easy to draw into wire and form into various shapes.
Industries
- Industrial resistance furnace heating elements, muffle furnace wire
- Heating elements for household appliances, including electric ovens and hair dryers
- Heating elements for laboratory high-temperature furnaces and sintering furnaces
- Heating components for plastic and glass machinery
Processing & Delivery
Complementary Services
- Wire straightening
- Custom Slitting to Length
- Provide material certification
- Technical Support & Selection Consulting
Delivery Timeline
Standard specifications in stock; ships in 3-5 business days. Custom special specifications require production; lead time is 7-15 business days. Nationwide delivery supported; expedited service available.
Frequently Asked Questions (FAQ)
What is the maximum operating temperature for Cr20Ni80 alloy wire?
Cr20Ni80 alloy wire has a maximum service temperature of 1200°C in air. In reducing atmospheres or sulfur-containing environments, the recommended maximum temperature is 1000°C to prevent sulfidation corrosion.
What is the difference between Cr20Ni80 and FeCrAl?
Cr20Ni80 is a nickel-chromium alloy. It has high cost but excellent toughness and machinability, making it suitable for complex shapes. Iron-chromium-aluminum alloys are lower in cost and have higher resistivity, but they are brittle and difficult to machine. Cr20Ni80 is better suited for precision heating elements.
Can Cr20Ni80 alloy wire be welded?
Cr20Ni80 alloy can be welded using TIG or resistance welding. Use matching filler metal or ERNiCr-3 wire; clean surface oxides before welding.
What is the resistivity of Cr20Ni80 alloy wire?
The resistivity of Cr20Ni80 alloy wire at 20°C is 1.09 Ω·mm²/m, with a temperature coefficient of resistance ≤100×10⁻⁶/°C. Resistance remains relatively stable across temperature variations.
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