NiCr
Heating Element & Resistance
Together with the company JLC Electromet, we supply a wide range of Nickel-Chromium alloys, which are characterized by high electrical resistivity and resistance to oxidation and chemical corrosion. Different combinations of Nickel & Chromium are used for making grades suitable for different temperatures. These alloys are used for making heating elements for industrial furnaces that can be used in alternating oxidizing/reducing atmosphere. They are also used to make heating elements for domestic appliances, such as toasters, geysers, etc. Nickel-Chromium alloys also find use in the production of precision resistors and potentiometers for automotive and consumer electronics industries.
NiCr 70:30
Commonly used for applications at high temperatures in oxidising atmosphere. The high Cr content of 30% provides it with excellent operating life in furnace applications. The alloy maintains excellent strength at higher temperatures. A desirable property of this alloy is that it can be used even in an alternating oxidising/reducing atmosphere. Maximum recommended element operating temperature is 1250 °C.
NiCr 60:15
This alloy is 60%Ni, 15%Cr and balance Fe with long life additives. Due to the presence of Fe, this alloy can be used in carbonaceous and moist atmospheres and has higher resistance to atmospheric corrosion than NiCr alloys. It is used for heating elements of domestic appliances and other heating application where maximum element operating temperature will not exceed 1100 °C. lt can also be drawn to super fine sizes.
NiCr 35:20
This alloy is suitable for operating at comparatively lower temperatures. lt is primarily used for controlled atmosphere furnaces applications is temperature range of 800°C- ll00°C.
NiCr 30:20
Nominal composition of this alloy is 30%Ni, 20%Cr, 2% Si, balance Fe and long life additives. lt maintains good strength at high temperatures. This alloy is suitable for use at relatively lower temperatures up to 1100 °c. It is resistant to sulphur attack & “green rot”.
NiCr 20:25
This alloy is 20%Ni, 25% Cr, balance Fe and some Si. Similar to stainless steel, this alloy is used as heating element for temperatures up to 1000 °c.
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| Specifications | ||||
|---|---|---|---|---|
| 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 |
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| Physical & Mechanical Properties (at room temperature) | ||||||
|---|---|---|---|---|---|---|
| Alloy |
Density g/cm³ |
Tensile Strength N/mm² |
Elongation % at L0=100 mm |
Specific Heat at 20°C J/kg°C |
Coeff of Linear Expansion b/w 20-1000°C 10-6/K |
Maximum Operating Temp of Heating Element °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 |
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| Electrical Properties | |||
|---|---|---|---|
| Alloy |
Specific Resistance (Electrical Resistivity) at 20°C µΩ-cm |
Temp Coeff of Resistance x 10-6/°C |
|
| 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 100R
(Ω/m) = Resistivity/(µΩ-cm) A(mm²) x 100 |
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