Nichrome 70 (UNS N06008 / W.Nr. 2.4658) is a nickel-chromium alloy (NiCr alloy) for use at temperatures up to 1250℃. The alloy is characterized by high resistivity and good oxidation resistance. It has good ductility after use and excellent weldability.
Equivalent Grades
| Trademark | GB | GOST | ASTM | UNS | DIN | W.Nr. | NF | BS | JIS | SS |
Nikrothal 70
Resistohm 70 | Cr30Ni70 | – | – | N06008 | NiCr70 30 | 2.4658 | – | – | – | – |
Chemical Composition, %
| Alloy | C | Si | Mn | P | S | Cr | Ni | Al | Fe |
| Nichrome 70 | ≤0.08 | 0.75-1.60 | ≤0.60 | ≤0.020 | ≤0.015 | 28.0-31.0 | Bal | ≤0.50 | ≤1.00 |
Mechanical Properties (RT, Annealed)
| Tensile Strength, Rm/MPa | Elongation, A/% |
Dia. >3.00mm (Wire)
Thk. >0.20mm (Strip) | Dia. 0.10-3.00mm (Wire)
Thk. <0.20mm (Strip) |
| ≥650 | ≥25 | ≥20 |
Physical Properties
| Max Working Temp., ℃ | Melting Point, ℃ | Density, g/cm3 | Resistivity, μΩ·m 20℃ | Specific Heat, J/(g•K) | Thermal Conductivity, W/(m•K) 20℃ | Average Coefficient of Thermal Expansion,α×10-6/℃ 20-1000℃ | Micrographic Structure | Magnetic Properties |
| 1250 | 1380 | 8.10 | 1.18 | 0.46 | 14 | 17.0 | Austenitie | Non-Magnetic |
Life Test
| Test Temperature, ℃ | Continuous Service Time Hours, ℃ |
| 1250 | ≥50 |
Temperature Factor of Resistivity
| 20℃ | 100℃ | 200℃ | 300℃ | 400℃ | 500℃ | 600℃ | 700℃ | 800℃ | 900℃ | 1000℃ | 1100℃ | 1200℃ | 1300℃ |
| 1.000 | 1.007 | 1.016 | 1.028 | 1.038 | 1.044 | 1.036 | 1.030 | 1.028 | 1.029 | 1.033 | 1.037 | 1.043 | – |
Available Products and Specifications
| Rod, Bar, Wire and Forgings | GB/T 1234-2012, DIN 17470-1984 |
| Plate, Sheet and Strip | GB/T 1234-2012, DIN 17470-1984 |
| Pipe and Tube | – |
| Welding Product | – |
| Others | – |
Features
- Great ductility
- Excellent workability and weldability under high temperature
- High and stable resistivity
- Surface oxidation resistance
- Sufficient high temperature strength
- Working temperature up 1250℃
Applications
- Corrosion resistant electric heating elements in industrial furnaces with reducing atmospheres
- Highly resistant to oxidation in air
- Not recommend for use in MgO sheathed heating elements, or applications using nitrogen or carburizing atmospheres
