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Cr20Ni80 Nickel Chromium Heating Wire for Industrial Furnaces (0.025-10mm)
Premium bright annealed Cr20Ni80 nickel chromium alloy resistance wire engineered for high temperature electric furnace heating elements and precision heating equipment.
- Overview
- Specifications
- Performance
- Applications
- Advantages
- FAQ
- Recommended Products
Product Summary
Cr20Ni80 Nickel Chromium Alloy Wire is an austenitic nickel-chromium resistance alloy containing approximately 80 percent nickel and 20 percent chromium. Known for its high electrical resistivity, excellent surface oxidation resistance at elevated temperatures, and superior dimensional stability, this bright annealed wire operates reliably at continuous service temperatures up to 1200 degrees Celsius. Available in diameters ranging from 0.025mm ultra-fine wire to 10mm heavy-duty rod, Cr20Ni80 is the global benchmark material for industrial furnace heating elements, heat treating equipment, and precision electrical heating appliances.
Product Overview
High Temperature Nichrome 80 Resistance Alloy
Cr20Ni80 (equivalent to Nichrome 80/20, Ni80Cr20, UNS N06003, and W.Nr. 2.4869) provides the highest thermal endurance among standard electric heating alloys. The balanced nickel-chromium matrix forms an adhesive, dense protective layer of chromium oxide under cyclic thermal stress, preventing spalling and core oxidation. With exceptional structural stability across extended heating cycles, Cr20Ni80 delivers non-magnetic properties, high hot strength, and minimal elongation after long-term service.
Technical Specifications and Material Properties
| Property Parameter | Metric Value | Imperial / Standard Value |
|---|---|---|
| Nominal Chemical Composition | Ni: Balance (~78.0-81.0%), Cr: 20.0-23.0%, Fe: ≤1.0%, Mn: ≤1.0%, Si: 0.75-1.50%, C: ≤0.06% | Consistent with GB/T and international resistance alloy standards |
| Maximum Continuous Operating Temperature | 1200 °C | 2192 °F |
| Melting Point | 1400 °C | 2552 °F |
| Density | 8.40 g/cm³ | 0.303 lb/in³ |
| Electrical Resistivity at 20 °C | 1.09 ± 0.05 μΩ·m | 656 Ω·circ mil/ft |
| Temperature Coefficient of Resistance (20-1000 °C) | 0.00008 / °C | Stable thermal resistance curve |
| Tensile Strength (Annealed State, M Condition) | ≥ 650 MPa (0.025-0.20mm: ≥ 700 MPa) | High mechanical integrity |
| Elongation (Annealed State) | ≥ 20 % | Superior coil winding formability |
| Microstructure & Magnetism | Fully Austenitic | Non-magnetic in both annealed and cold-worked states |
| Available Diameter Range | 0.025 mm to 10.0 mm | Ultra-fine wire to heavy industrial rod |
| Surface Finish Condition | Bright Annealed (Hydrogen / Vacuum Atmosphere), Pickled, or Oxidized | Clean, smooth, oxide-free surface |
Core Performance Features of Bright Annealed Ni80Cr20 Heating Element Wire
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Superior High-Temperature Oxidation Resistance Cr20Ni80 develops a self-healing, adherent chromium oxide outer layer upon heating, preventing core metal degradation and thermal fatigue even under frequent on-off power cycles.
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High Electrical Resistivity and Thermal Efficiency With a resistivity of approximately 1.09 micro-ohm meters, Cr20Ni80 enables compact heating element configurations with high power density and uniform thermal distribution.
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High Hot Strength and Structural Stability Maintains excellent structural form without sagging, embrittlement, or excessive deformation after continuous operation at temperatures up to 1200 degrees Celsius.
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Hydrogen Bright Annealed Surface Quality Manufactured with precision atmosphere annealing, delivering a spotless, oxide-free bright surface that ensures smooth automated coiling, uniform resistance, and consistent weldability.
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Extended Operational Life Cycle Resistant to structural recrystallization embrittlement compared to iron-chromium-aluminum alloys, delivering reliable operational life and reduced downtime in heavy industrial operations.
Industrial Heating Applications of Cr20Ni80 Electric Resistance Wire
- Industrial Furnace & Kiln Heating Elements: Continuous ceramic sintering kilns, vacuum heat-treatment furnaces, glass melting Lehr ovens, and metallurgical annealing lines.
- Precision Electrical Heating Appliances: Industrial hot air guns, convection heating coils, tubular heating elements, cartridge heaters, and thermal sealing bars.
- Semiconductor and Laboratory Equipment: Diffusion furnace heating cassettes, chemical vapor deposition heaters, high-precision thermal chambers, and laboratory tube furnaces.
- Braking and Load Bank Resistors: High-power dynamic braking grids, neutral grounding resistors, and heavy-duty electrical testing load banks.
- Ultra-Fine Wire Thermal Components: Micro-heating coils for precision instruments, thermal cutters, medical devices, and analytical sensors (0.025mm to 0.10mm).
Why Partner with DLX for Industrial Resistance Alloy Solutions
- Integrated Manufacturing & Scale: Advanced vacuum induction melting, hot rolling, cold drawing, and continuous bright annealing lines supporting a monthly production capacity of 1,200 tons.
- Comprehensive Dimensional Coverage: In-house fine-wire drawing technology capable of manufacturing ultra-fine diameters from 0.025mm up to 10mm wire, bar, and strip products.
- Rigorous Quality Inspection: 100% electrical resistance calibration, optical surface defect scanning, tensile strength verification, and full chemical spectrometry testing for every batch.
- Fast Global Logistics and Low MOQ: Standard Minimum Order Quantity from 5 kg for standard stock specifications, with free 0.5 kg test samples available for quality verification.
- Professional Engineering Support: Experienced technical consultants assist in calculating heating element resistance, coil dimensions, power density, and surface loading optimization.
Frequently Asked Questions (FAQ) on Cr20Ni80 Resistance Heating Wire
Q1: What is the main difference between Cr20Ni80 and FeCrAl (Iron-Chromium-Aluminum) alloys? Cr20Ni80 contains approximately 80% nickel and exhibits superior hot strength, high ductility after extended high-temperature exposure, and fully non-magnetic properties. Unlike FeCrAl alloys, Cr20Ni80 does not become brittle at room temperature after being heated, making element repair, reshaping, and vibration resistance much better.
Q2: What diameter range and packaging options does DLX provide for Cr20Ni80 wire? We supply diameters from 0.025mm to 10.0mm. Fine wires (0.025mm to 0.8mm) are supplied on precision plastic spools (DIN100, DIN125, DIN160, DIN200) inside moisture-proof cartons. Coarser wires and rods (above 0.8mm to 10mm) are supplied in secure coils or straight lengths in wooden crates.
Q3: Can Cr20Ni80 wire be used in reducing or sulfur-bearing furnace atmospheres? Cr20Ni80 performs best in oxidizing, nitrogen, or neutral atmospheres. In sulfur-containing atmospheres or carbon monoxide-rich reducing environments at high temperatures, protective measures or alternative alloy grades should be selected. Our engineering team can provide atmosphere compatibility recommendations based on your furnace conditions.
Q4: What is the Minimum Order Quantity (MOQ) and sample lead time for Cr20Ni80 wire? Our standard MOQ is 5 kg for standard wire sizes. We provide free 0.5 kg evaluation samples for qualified industrial customers, with standard samples dispatched within 24 to 48 hours. Custom specifications are manufactured and delivered according to project schedules.
