Cronix 70 Nicr Alloy Heating Resistor Wire For Electric Element
NiCr 70/30/Cronix 70/2.4658 1250C heating wire for electric elements
Common trade names NiCr 70/30, Resistohm 70, Nikrothal 70, Chromel 70/30, HAI-NiCr 70, Cronix 70, Inalloy 70, X30H70.
NiCr 70 30 (Werkstoff Nr 2.4658) is an austenitic Nickel-Chromium alloy for use at temperatures up to 1250°C. The 70/30 alloy is characterized by high resistivity and good oxidation resistance. It has good ductility after use and excellent weldability.
Chemical Composition
| NickelNi67-70% | ChromiumCr29-32% | IronFe1.0% | SiliconSi1.0-2.5% | ManganeseMn1.0% | CopperCu0.5% | CarbonC0.1% | CupperCu0.4% | AluminiumAl0.1% |
Physical Properties
| Density at Room°C |
Electrical Resistivity at 20°C |
Melting Point °C |
Max Continuous Operating Temperature in Air °C |
Magnetic Properties |
| 8.2 g/cm3 | 1.16(1.19)* microhm-m | 1380 | 1200 | The Material is Non-Magnetic |
| *Electrical Resistivity 1.16 Ω mm2/m corresponds to an Oxidized Annealed condition Electrical Resistivity 1.19 Ω mm2/m corresponds to a Bright Annealed condition |
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Mechanical Properties
| NiCr 80 20 Wire, mm |
Yield Strength Rp0.2 (MPa) |
Tensile Strength Rm (MPa) |
Elongation A % |
Hardness Hv |
| 1.0 | 420 | 810 | 30 | 180 |
| 4.0 | 300 | 725 | 30 | 160 |
Product Forms
| Product | Size (mm) | Condition of Supply |
| Wire | 0.2 – 12.0 | Bright Annealed Oxidized |
| Bar | 5.0 – 60.0 | Hot Finished Cold Finished Peeled Bright Turned Bright Annealed |
| Strip | Thickness 2.5 – 5.0 Width 20 – 100 |
Cold Finished Bright Annealed |
| Ribbon | Thickness 0.2 – 1.0 Width 2.0 – 4.5 |
Bright Annealed Flat Rolled |
| Stranded Wire | 2.5 – 3.0 | Hard Annealed |
Application
NiCr 70-30 is used for corrosion resistant electric heating elements in industrial furnaces with reducing atmospheres. Nickel Chrome 70/30 is highly resistant to oxidation in air. Not recommend for use in MgO sheathed heating elements, or applications using nitrogen or carburizing atmospheres.
- Electrical parts and electronic components.
- Electric heating elements (home & industrial use).
- Industrial furnaces up to 1250°C.
- Heating cables, mats and cords.
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