Cr20Ni80 Nickel-Chromium Resistance Wire
Also Known As: Nichrome V, Tophet A, Alloy A, Brightray C, Cronix 80, Nikrothal 8, Chromalloy, Chromel A, and Gilphy 80, N8, HAI-NiCr 80, Resistohm 80, Protoloy, MWS-650, Stablohm 650
Max. 1200°C| Chemical Composition (%) | |
|---|---|
| Element | Value |
| C | ≤0.08 |
| P | ≤0.02 |
| S | ≤0.015 |
| Mn | ≤0.6 |
| Si | 0.75~1.6 |
| Cr | 20.0~23.0 |
| Ni | Remainder |
| Al | ≤0.5 |
| Fe | ≤1.0 |
| Physical Properties | |
| Max. Operating Temp. | 1200°C |
| Resistivity at 20°C (μΩ·m) | <0.50mm: 1.09±0.05; 0.5–3.0mm: 1.13±0.05; >3.0mm: 1.14±0.05 |
| Density | 8.40 g/cm³ |
| Thermal Conductivity (20°C) | 15 W/(m·K) |
| Linear Expansion Coeff. (20–1000°C) | 18.0×10-6/K |
| Specific Heat Capacity | 0.46 J/(g·K) |
| Approx. Melting Point | 1400°C |
| Elongation (A/%) | ≤3.0mm: ≥20%; >3.0mm: ≥25% |
| Tensile Strength (Rm) | ≥650 MPa |
| Accelerated Life Test | ≥80h/1200°C |
| Microstructure | Austenite |
| Magnetic Properties | Nonmagnetic |
| Available Forms | |
| Form | Size |
| Bright & Soft Annealed Wire | 0.025–1.6mm |
| Acid-Pickled Wire | 1.0–12.0mm |
| Rods | 6.0–150.0mm |
| Flat Wires | Width 0.2–6.0mm, Thickness 0.08–1.0mm |
| Strips | Width 5.0–300mm, Thickness 0.05–4.0mm |
Product Overview
Cr20Ni80 is the most widely used nickel-chromium resistance alloy in the heating industry. With an optimal balance of nickel (80%) and chromium (20%), it offers outstanding high-temperature strength, excellent oxidation resistance, and highly stable resistivity over repeated heating cycles. It is the go-to choice for industrial furnace elements, household appliance heaters, and laboratory equipment worldwide.
Key Advantages
- Excellent oxidation resistance at high temperatures
- Stable resistance value over repeated heating cycles
- Good formability and weldability
- Long service life even under demanding conditions
Typical Applications
- Industrial furnace heating elements
- Household appliance heating coils
- Ceramic and glass manufacturing equipment
- Laboratory furnace elements
- Plastic molding and packaging machinery
Standards & Compliance
GB/T 1234-2012
High Resistance Alloys
DIN 17471
Resistance Heating Alloys (German Standard)
ASTM B344
Nickel-Chromium and Nickel-Chromium-Iron Alloys for Electrical Heating Elements (US Standard)
ASTM B603
Iron-Chromium-Aluminum Alloys for Electrical Heating Elements (US Standard)
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