Nickel-chromium 80/20 generally refers to NiCr 80/20, with a typical composition of approximately 80% nickel and 20% chromium. Common grades include Cr20Ni80, Nichrome 80, and Ni80Cr20. Its core advantages are: high resistivity, high temperature resistance, oxidation resistance, long service life, and good temperature stability.
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 Selina for more details.
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