Nickel-Chromium: Heating Element and Resistance AlloysAlloy Description
NiCr 80:20 - Industrial furnaces (up to 1200°C), electric cooking equipment, precision resistors.
NiCr 70:30 - Industrial furnaces (up to 1230°C) with alternating oxidizing/reducing atm., precision resistors.
NiCr 60:15 - Industrial furnaces (up to 1100°C), electrically heated equipment, high-resistance and potentiometer resistors.
NiCr 40:20 - Domestic heating appliances (up to 1050°C), furnaces in carburising or semi-reducing atmosphere.
NiCr 30:20 - Industrial furnaces (up to 1050°C), heating elements of cooking equipment.
Condition of Supply
NiCr alloys are available in following conditions:
- Bright Annealed
- Oxidized Annealed
- Bright Drawn
Properties
| Specific Resistance (Electrical Resistivity) µOhm-cm | Density g/cm³ | Linear Expansion Coeff. bet RT & 1000°C (10-6/K) | Maximum Operating Temperature (°C) (in air) | |
|---|---|---|---|---|
| NiCr 80:20 | 108 | 8.3 | 17.0 | 1200 |
| NiCr 70:30 | 118 | 8.1 | 17.0 | 1250 |
| NiCr 60:15 | 112 | 8.2 | 17.0 | 1100 |
| NiCr 40:20 | 105 | 7.9 | 19.0 | 1050 |
| NiCr 30:20 | 104 | 7.9 | 19.0 | 1000 |
For Resistance (in Ohm/m) of any size, devide the above resistivity with (cross-sectional area in mm² of that size x 100).
R (ohm/m) = Resistivity (michrohm-cm) / A (in mm²) x 100
Size Range
| Wire | Strip | Ribbon | |
|---|---|---|---|
| Dia (mm) | 12 - 0.15 | - | - |
| Width (mm) | - | 5 - 100 | 0.5 - 5 |
| Thickness (mm) | - | 0.5 - 3 | 0.15 & Above |
Mechanical Properties at Room Temperature
| NiCr 80:20 | NiCr 70:30 | NiCr 60:15 | NiCr 40:20 | NiCr 30:20 | |
|---|---|---|---|---|---|
| Tensile strength Min-Max (N/mm²) | 700-900 | 800-950 | 700-850 | 700-850 | 650-800 |
| Elongation % (L0=100 mm) | 25-35 | 25-30 | 25-35 | 25-35 | 25-35 |
Note: Other Grades of Nickel-Chromium resistance alloys are also available. Please contact us for more information.
