Ni80Cr20 (8020 nickel-chromium alloy) is a high-resistance electrothermal alloy with excellent performance.
Due to its outstanding high-temperature stability and corrosion resistance, it is widely used in the manufacture of various heating elements.
In a ventilator, the heating wire mainly serves as a heating element, used to warm and moisten breathing gases.
When a patient uses a ventilator, the inhaled gas is heated to an appropriate temperature through a heating wire to reduce irritation to the respiratory tract and improve patient comfort.
The working principle of a heating wire is mainly based on the electric heating effect.
When current passes through a wire, the wire heats up, a physical phenomenon known as the electric heating effect.
In a ventilator, the heating wire uses this principle to heat gas.
Specifically, the heating wire of a ventilator is usually made of high resistance materials such as nickel chromium alloy or constantan.
When current passes through these high resistance materials, electrical energy is converted into thermal energy, causing the heating wire to heat up.
This heating effect is uniform and continuous, ensuring that the gas passing through is uniformly heated.
Why Nickel-Chromium (Ni-Cr) Wire is Suitable for Heating Elements?
Nickel-chromium wire is widely used as heating wire because it strikes an excellent balance between heating efficiency, high-temperature stability, and durability, with overall performance superior to another common type of heating wire—iron-chromium-aluminum (Fe-Cr-Al) wire.
Although nickel-chromium wire is more expensive, its high reliability and long service life are often more critical factors in heating applications that require:
- Long-term stable operation
- Strict shape retention
- Corrosive or demanding environments (such as in medical devices, which you mentioned earlier)
These advantages make Ni-Cr wire the preferred choice despite its higher upfront cost.
1. Chemical Composition and Properties of nichrome alloys:
| Propertes/Grade |
NiCr 80/20 |
NiCr 70/30 |
NiCr 60/15 |
NiCr 35/20 |
NiCr 30/20 |
| Main Chemical Composition(%) |
Ni |
Bal. |
Bal. |
55.0-61.0 |
34.0-37.0 |
30.0-34.0 |
|
Cr |
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 |
Bal. |
Bal. |
Bal. |
|
Al |
|
|
|
|
|
|
Mn |
|
|
|
|
|
| Max Working Temperature(ºC) |
1200 |
1250 |
1150 |
1100 |
1100 |
Resistivity at 20ºC
(μ Ω · m) |
1.09 |
1.18 |
1.12 |
1.04 |
1.04 |
| Density(g/cm3) |
8.4 |
8.1 |
8.2 |
7.9 |
7.9 |
Thermal Conductivity
(KJ/m· h· ºC) |
60.3 |
45.2 |
45.2 |
43.8 |
43.8 |
| Coefficient of Thermal Expansion(α * 10-6/ºC) |
18 |
17 |
17 |
19 |
19 |
| Melting Point(ºC) |
1400 |
1380 |
1390 |
1390 |
1390 |
| Elongation(%) |
> 20 |
> 20 |
> 20 |
> 20 |
> 20 |
| Micrographic Structure |
austenite |
austenite |
austenite |
austenite |
austenite |
| Magnetic Property |
nonmagnetic |
nonmagnetic |
nonmagnetic |
nonmagnetic |
nonmagnetic |
2. Advantages & services
- ROHS cerfication;
- Small orders are accepted;
- Factory direct sale;
- Timely delivery;
- Samples are available;
3. Features
- Good oxidation resistance;
- Low embrittlement at high temperature;
- Good plasticity(easier to give them a shape);
- Nice performance and processing;
4. Applications scenarios
- Electronic components: used for manufacturing precision resistors, potentiometers, and other components due to their low temperature coefficient of resistance and stable mechanical properties.
- Electric heating equipment: As a heating element or high-temperature resistance wire, it is commonly used in electric heating alloys, electric blankets, etc.
- Industrial sector: Partial replacement of stainless steel materials for manufacturing corrosion-resistant components.
5. More pictures on our products:
Enameled Nichrome wire:
About Tankii:
Tankii is a professional supplier specializing in electrothermal alloys, precision alloys, and thermocouple materials.
Its main products include nickel-chromium, iron-chromium-aluminum, copper-nickel, and pure nickel wires/strips,
and it exports to over 50 countries.
Core Products (TANKII Brand)
1. Electrothermal Alloys (Mainly Ni-Chromium 8020 Flat Wire/Strip)
Ni-Chromium Series: Cr20Ni80 (8020), Cr15Ni60, Cr30Ni70 Wire/Strip
Fe-Chromium-Aluminum Series: 0Cr21Al6, 0Cr25Al5, 0Cr27Al7Mo2 Wire/Strip
Copper-Nickel Series: CuNi1/2/6/8/10/14/19/23/30/34/40/44 Wire/Strip
Pure Nickel Series: N4, N6 Wire/Strip/Bar
2. Precision Resistance Alloys
Manganin, Constantan, Kamar wire, Nickel-Iron alloy wire/strip
3. Thermocouples and Compensating Wires
K, J, E, T, N, S, R, B type thermocouple wires/compensating wires
Core Advantages and Positioning
- Focusing on Electrothermal/Precision Alloys: 35 years of deep expertise, specializing in flat wires/strips (highly matched to your needs)
- Capacity and Delivery: Large-scale production at Xuzhou base, with an annual output of approximately 3,000 tons, ensuring ample inventory and fast delivery.
- Export-Oriented: Products sold to over 50 countries, compatible with international standards (European/American standard shafts)
- Application Scenarios: Home appliance heating, industrial electric furnaces, automotive thermal management, medical instruments, 3D printing heated beds, etc.
Please Contact me for more details.
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