High Corrosion Resistant Nichrome 70 Alloy Cr30Ni70 Flat Strip
Tapes For Industry Furnace Heating
The Cr30Ni70 Nichrome alloy strip is a specialized
nickel-chromium-based resistance material that offers exceptional
performance in high-temperature and high-resistance applications.
Compared to other Nichrome alloy strips, the Cr30Ni70 composition
sets it apart with its unique blend of properties.
Composition and Key Characteristics:
Chromium (Cr) content: Approximately 30%
Nickel (Ni) content: Approximately 70%
The remaining balance is primarily composed of iron (Fe) and minor
alloying elements.
Unparalleled Electrical Resistivity:
The Cr30Ni70 Nichrome strip has the highest electrical resistivity
among Nichrome alloys, typically ranging from 1.10 to 1.20
ohm-mm²/m.
This exceptionally high resistivity makes the Cr30Ni70 strip 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.
Exceptional 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 alloys.
This allows the Cr30Ni70 strip to operate reliably at temperatures
exceeding 1300°C without significant degradation or failure due to
oxidation.
The superior high-temperature performance makes the Cr30Ni70 strip
ideal for use in the most demanding heating element applications,
such as industrial furnaces, kilns, and specialized
high-temperature equipment.
Superior Corrosion Resistance:
The high nickel content (70%) in the Cr30Ni70 alloy delivers
excellent corrosion resistance, surpassing the performance of other
Nichrome alloys.
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.
Ductility and Formability:
Despite its high chromium and nickel contents, the Cr30Ni70
Nichrome strip maintains a good balance of ductility and strength.
This allows the strip to be readily formed, bent, or shaped into
various heating element configurations, enabling versatile design
and integration options.
Applications:
1. The Cr30Ni70 Nichrome alloy strip is primarily used in the
following high-performance applications:
2. Heating elements for industrial furnaces, kilns, and other
high-temperature equipment
3. Sensing elements for temperature measurement in critical,
high-temperature environments
4. Resistor components in specialized industrial and electronic
systems
5. Catalytic converters in automotive exhaust systems exposed to
extreme temperatures
In summary, the Cr30Ni70 Nichrome alloy strip stands out from other
Nichrome alloy strips due to its unparalleled electrical
resistivity, exceptional high-temperature strength and oxidation
resistance, superior corrosion resistance, and good ductility.
These unique properties 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 |
