Cr30Ni70 Nichrome 70 Alloy Tophet 30 Heating Resistance Round Wire
for Heating Application
Cr30Ni70 Nichrome wire is a specialized nickel-chromium-based alloy
wire that offers exceptional performance in high-temperature and
high-resistance applications. Compared to other Nichrome alloy
wires, the Cr30Ni70 composition sets it apart with its unique blend
of properties.
Cr30Ni70 Nichrome wire has the highest electrical resistivity among
Nichrome alloy wires, typically ranging from 1.10 to 1.20
ohm-mm²/m.
This exceptionally high resistivity makes the Cr30Ni70 wire the
preferred choice for applications that require extremely
high-resistance heating or sensing elements, where a smaller
cross-sectional area is needed to achieve the desired resistance.
Outstanding High-Temperature Strength and Oxidation Resistance:
The increased chromium content (30%) in the Cr30Ni70 alloy provides
unmatched high-temperature strength and oxidation resistance
compared to other Nichrome alloy wires.
This allows the Cr30Ni70 wire to operate reliably at temperatures
exceeding 1300°C without significant degradation or failure due to
oxidation.
The superior high-temperature performance makes the Cr30Ni70 wire
ideal for use in the most demanding heating element applications,
such as industrial furnaces, kilns, and specialized
high-temperature equipment.
Excellent Corrosion Resistance:
The high nickel content (70%) in the Cr30Ni70 alloy delivers
excellent corrosion resistance, surpassing the performance of other
Nichrome alloy wires.
This corrosion resistance is crucial in applications where the
heating element may be exposed to harsh, corrosive environments,
such as in chemical processing equipment or exhaust systems.
Good Mechanical Strength and Ductility:
The Cr30Ni70 Nichrome wire maintains a good balance of mechanical
strength and ductility, allowing it to be readily formed, bent, or
shaped into various configurations.
This facilitates versatile design and integration options for the
wire in different heating element applications.
Applications:
The Cr30Ni70 Nichrome alloy wire is primarily used in the following
high-performance applications:
Heating elements for industrial furnaces, kilns, and other
high-temperature equipment
Sensing elements for temperature measurement in critical,
high-temperature environments
Resistor components in specialized industrial and electronic
systems
Catalytic converters in automotive exhaust systems exposed to
extreme temperatures
In summary, the Cr30Ni70 Nichrome alloy wire stands out from other
Nichrome alloy wires due to its unparalleled electrical
resistivity, exceptional high-temperature strength and oxidation
resistance, excellent corrosion resistance, and good mechanical
properties. These unique characteristics make it the preferred
choice for the most demanding high-temperature, high-resistance,
and corrosive heating and sensing applications.
| Performance material | Cr10Ni90 | Cr20Ni80 | Cr30Ni70 | Cr15Ni60 | Cr20Ni35 | Cr20Ni30 |
| Composición | Ni | 90 | Rest | Rest | 55.0～61.0 | 34.0～37.0 | 30.0～34.0 |
| Cr | 10 | 20.0～23.0 | 28.0～31.0 | 15.0～18.0 | 18.0～21.0 | 18.0～21.0 |
| Fe | － | ≤1.0 | ≤1.0 | Rest | Rest | Rest |
| Max. temperature( °C ) | 1300 | 1200 | 1250 | 1150 | 1100 | 1100 |
| Melting Point ℃ | 1400 | 1400 | 1380 | 1390 | 1390 | 1390 |
| Density(g/cm3) | 8.7 | 8.4 | 8.1 | 8.2 | 7.9 | 7.9 |
| Resistivity at 20ºC(μΩ@m) | 0.76±0.05 | 1.09±0.05 | 1.18±0.05 | 1.12±0.05 | 1.00±0.05 | 1.04±0.05 |
| Elongation at rupture(%) | ≥20 | ≥20 | ≥20 | ≥20 | ≥20 | ≥20 |
| Specific Heat J/g.℃ | － | 0.44 | 0.461 | 0.494 | 0.5 | 0.5 |
| Thermal conductivity KJ/m.h℃ | － | 60.3 | 45.2 | 45.2 | 43.8 | 43.8 |
| Coefficient of lines expansion a×10-6/(20～1000℃) | － | 18 | 17 | 17 | 19 | 19 |
| Micrographic structure | － | Austenite | Austenite | Austenite | Austenite | Austenite |
| Magnetic properties | － | Nonmagnetic | Nonmagnetic | Nonmagnetic | Weak magnetic | Weak magnetic |
