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Good Oxidation Resistance NiCr 70/30 for Heating Cables
NiCr 70/30 (2.4658) 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
| Grade | Ni80Cr20 | Ni70Cr30 | Ni60Cr23 | Ni60Cr15 | Ni35Cr20 | Karma | Evanohm | |
| Nominal composition% | Ni | Bal | Bal | 58.0-63.0 | 55.0-61.0 | 34.0-37.0 | Bal | Bal |
| Cr | 20.0-23.0 | 28.0-31.0 | 21.0-25.0 | 15.0-18.0 | 18.0-21.0 | 19.0-21.5 | 19.0-21.5 | |
| Fe | ≦1.0 | ≦1.0 | Bal | Bal | Bal | 2.0-3.0 | – | |
| Al1.0-1.7 Ti 0.3-0.5 | Al2.7-3.2 Mn0.5-1.5 | Al2.7-3.2 Cu2.0-3.0 Mn0.5-1.5 | ||||||
| Max operating temp(°C) | 1200 | 1250 | 1150 | 1150 | 1100 | 300 | 400 | |
| Resisivity(Ω/cmf,20℃) | 1.09 | 1.18 | 1.21 | 1.11 | 1.04 | 1.33 | 1.33 | |
| Resisivity(uΩ/m,60°F) | 655 | 704 | 727 | 668 | 626 | 800 | 800 | |
| Density(g/cm³) | 8.4 | 8.1 | 8.4 | 8.2 | 7.9 | 8.1 | 8.1 | |
| Thermal Conductivity(KJ/m·h·℃) | 60.3 | 45.2 | 45.2 | 45.2 | 43.8 | 46.0 | 46.0 | |
| Linear Expansion Coefficient(×10¯6/℃)20-1000℃) | 18.0 | 17.0 | 17.0 | 17.0 | 19.0 | - | - | |
| Melting Point(℃) | 1400 | 1380 | 1370 | 1390 | 1390 | 1400 | 1400 | |
| Hardness(Hv) | 180 | 185 | 185 | 180 | 180 | 180 | 180 | |
| Tensile Strength(N/mm2 ) | 750 | 875 | 800 | 750 | 750 | 780 | 780 | |
| Elongation(%) | ≥20 | ≥20 | ≥20 | ≥20 | ≥20 | 10-20 | 10-20 | |
| Micrographic Structure | austenite | austenite | austenite | austenite | austenite | austenite | austenite | |
| MagneticProperty | Non | Non | Non | Slightly | Non | Non | Non | |
| Fast Life(h/℃) | ≥81/1200 | ≥50/1250 | ≥81/1200 | ≥81/1200 | ≥81/1200 | - | - | |
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