Nickel Chromium Heating Resistance Nichrome Alloy Wire
Nichrome (NiCr, nickel-chrome, chrome-nickel, etc) is the oldest form of resistance heating alloy. It’s one of the various alloys of nickel, chromium, and often iron or possibly other elements.
Classification: Nichrome alloy, as resistance wire, as heating elements, can be classified as nichrome resistance heating wire, resistance heating flat and resistance heating strip according to the section shape.
Property:
- High strength and stability at high temperatures;
- Not becoming brittle after long-term use and cooling down;
- Resistance to oxidation: Most metals oxidize quickly and become brittle and break when heated in air. However, when heated to red-hot temperatures, nichrome wire, develops an outer layer of chromium oxide, which is thermodynamically stable in air, is mostly impervious to oxygen, and protects the heating element from further oxidation.
- Non-magnetic;
- Corrosion-resistant;
- Good Ductility: remaining ductile, even after long-term usage;
- Excellent weldability and etc.
Grades:
| Alloy Nomenclature Performance | Cr20Ni80 | Cr30Ni70 | Cr15Ni60 | Cr20Ni35 | Cr20Ni30 | |
| Main Chemical composition | Ni | Rest | Rest | 55.0-61.0 | 34.0-37.0 | 30.0-34.0 |
| Cr | 20.0-23.0 | 28.0-31.0 | 15.0-18.0 | 18.0-21.0 | 18.0-21.0 | |
| Fe | ≤1.0 | ≤1.0 | Rest | Rest | Rest | |
| Max continuous service temp(ºC) | 1200 | 1250 | 1150 | 1100 | 1100 | |
| Resistivity at 20ºC (μΩ·m) | 1.09 | 1.18 | 1.12 | 1 | 1.04 | |
| Density(g/cm3) | 8.4 | 8.1 | 8.2 | 7.9 | 7.9 | |
| Thermal conductivity (KJ/m·h·ºC) | 60.3 | 45.2 | 45.2 | 43.8 | 43.8 | |
| Coefficient of lines expansion(α×10-6/ºC) | 18 | 17 | 17 | 19 | 19 | |
| Melting point approx.( ºC) | 1400 | 1380 | 1390 | 1390 | 1390 | |
| Elongation at rupture(%) | >20 | >20 | >20 | >20 | >20 | |
| Micrographic structure | austenite | austenite | austenite | austenite | austenite | |
| Magnetic properties | nonmagnetic | nonmagnetic | Weak magnetic | Weak magnetic | Weak magnetic | |
Applications:
- Polystyrene cutting
- Styrofoam cutting
- Foam cutting
- Plastic film cutting
- Electric heaters
- Night store heaters
- Composite curing
- Cartridge heaters
- Electric furnaces
- Wind turbines
- Freeze protection
- Heated hoses
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