These alloys are especially characterized by high resistivity and high resistance to oxidation and chemical corrosion. They are suitable for making high-value electrical resistors, heating wires, heating cords and cables.
NiCr 80:20 is suitable for heating elements used for temperatures upto 1200°C. This is used for electrical cooking equipment, precison resistors. Oxidized wires of these alloys display better insulation properties.
NiCr 70:30 is suitable for heating elements used for temperatures upto 1230°C for industrial furnaces which have alternating oxidizing, or reducing atmosphere. This alloy has excellent corrosion resistance and long life in air and controlled atmospheres.
NiCr 60:15 is suitable for heating elements used for temperatures upto 1150°C. This is used for electrically heated equipment, high resistance and potientiometer resistors.
NiCr 40:20 is suitable for heating elements used for temperatures upto 1050°C. This is used for domestic heating appliances, furnaces in carburizing, or semi-reducing atmospheres.
NiCr 30:20 / NiCr 20:25 are suitable for heating elements used for temperatures upto 1050°C. Inspite of relatively high Fe content, these alloys are resistant to oxidation and chemical corrosion. They are used for making heating elements of cooking equipment, heating cords and cables.
| Alloy | ASTM | Werkstoff Nr | UNS designation | DIN |
|---|---|---|---|---|
| NiCr 80:20 | B344 | 2.4869 | N06003 | 17470 / 17471 |
| NiCr 70:30 | - | 2.4658 | N06003 | 17470 |
| NiCr 60:15 | - | 2.4867 | N06004 | 17470 / 17471 |
| NiCr 40:20 | - | - | - | - |
| NiCr 30:20 | B344 | 1.4860 | - | 17470 |
| NiCr 20:25 | - | 1.4843 | - | 17470 |
| Alloy | Ni | Mn | Fe | Si | Cr | C | Al | Cu |
|---|---|---|---|---|---|---|---|---|
| NiCr 80:20 | Balance | Max 1.0 | Max 1.0 | 1.0-1.5 | 19-21 | Max 0.10 | Max 0.30 | Max 0.50 |
| NiCr 70:30 | Balance | Max 1.0 | Max 1.0 | 1.0-3.0 | 28-32 | Max 0.10 | Max 0.20 | Max 0.50 |
| NiCr 60:15 | Min 57.0 | Max 1.0 | Balance | 1.0-1.5 | 14-17 | Max 0.10 | Max 0.30 | Max 0.50 |
| NiCr 40:20 | Min 37.0 | Max 1.0 | Balance | 1.8-3.0 | 18-22 | Max 0.10 | Max 0.30 | Max 0.50 |
| NiCr 30:20 | Min 28.0 | Max 1.0 | Balance | 1.8-3.0 | 18-22 | Max 0.10 | Max 0.30 | Max 0.50 |
| NiCr 20:25 | Min 18.0 | Max 1.0 | Balance | 1.0-1.5 | 23-27 | Max 0.10 | Max 0.30 | Max 0.50 |
| Alloy | Density | Tensile Strength | Elongation | Specific Heat at 20°C |
Coeff. of Linear Expansion b/w 20-1000 °C |
Max. Operating Temp of Heating Element |
|---|---|---|---|---|---|---|
| g/cm³ | N/mm² | % at L0=100 mm | J/kg°C | 10-6/K | °C | |
| NiCr 80:20 | 8.41 | 700-900 | 25-35 | 435 | 17 | 1200 |
| NiCr 70:30 | 8.16 | 800-950 | 25-30 | 460 | 17 | 1250 |
| NiCr 60:15 | 8.25 | 700-850 | 25-35 | 450 | 17 | 1150 |
| NiCr 40:20 | 7.95 | 700-850 | 25-35 | 460 | 19 | 1050 |
| NiCr 30:20 | 7.90 | 650-800 | 25-35 | 500 | 19 | 1050 |
| NiCr 20:25 | 7.80 | 600-800 | 25-35 | 500 | 14 | 1050 |
| Alloy | Specific Resistance (Electrical Resistivity) at 20°C |
Temp Coeff of Resistance x 10-6/°C |
|
|---|---|---|---|
| µΩ-cm | Value | Temp Range | |
| NiCr 80:20 | 108 | 60 | 20-1000°C |
| NiCr 70:30 | 118 | 110 | 20-1000°C |
| NiCr 60:15 | 112 | 170 | 20-1000°C |
| NiCr 40:20 | 105 | 60 | 20-1000°C |
| NiCr 30:20 | 104 | 60 | 20-1000°C |
| NiCr 20:25 | 95 | 60 | 20-1000°C |
For resistance in Ω/m of any size, divide the above resistivity with cross-sectional area in mm² of the size x 100:
| Form | Dia | Width | Thickness |
|---|---|---|---|
| mm | mm | mm | |
| Wire | 0.10 - 12.0 | - | - |
| Strip | - | 10 - 100 | 0.2 - 4.5 |
| Ribbon | - | 2.0 - 4.5 | 0.2 - 1.0 |
Other Grades of Nickel-Chromium resistance alloys are also available. Please contact us for more information.
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