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Cr30Ni70 Nichrome Flat Wire Strip for Resistor and Furnace Heating
Our Cr30Ni70 Nichrome Flat Wire Strip is a high-quality nickel-chromium alloy resistance heating material designed for demanding electrical and thermal applications. With 30% chromium and 70% nickel, this flat strip provides excellent high-temperature performance, uniform heat distribution, and long service life in resistor and furnace heating systems.
- Overview
- Specification
- Applications
- FAQs
- Recommended Products
- Excellent Electrical Resistivity: Optimized ~1.18 μΩ·m resistivity for efficient heat generation in resistor wire and heating element designs.
- High Operating Temperature: Continuous service up to 1250°C, ideal for industrial electric furnaces and high-temp heating applications.
- Flat Wire Strip Design: Enhanced surface area compared to round nichrome wire for uniform heating, faster response, and easier coil forming or embedding.
- Outstanding Oxidation & Corrosion Resistance: Self-forming protective oxide layer ensures long lifespan in oxidizing atmospheres.
- Low Thermal Expansion & High Ductility: Maintains structural integrity during thermal cycling; easy to weld, form, and customize.
Overview of Cr30Ni70 Nichrome Flat Wire Strip:
Cr30Ni70 Nichrome Flat Wire (also known as NiCr 70/30 flat strip) is a premium resistance alloy optimized for applications requiring reliable electrical resistivity and exceptional heat resistance. Unlike standard round nichrome wire, the flat strip format offers superior surface area for faster heat transfer, better winding stability, and efficient integration into heating elements, resistors, and high-temperature furnaces.
Key specifications include high melting point (~1380°C), low thermal expansion, and strong oxidation resistance thanks to the protective chromium oxide layer formed at operating temperatures. This makes it a top choice for precision resistors, electric furnace heating elements, and custom resistance wire projects.
Features of Cr30Ni70 Nichrome Flat Wire Strip:
| Performance material | Cr10Ni90 | Cr20Ni80 | Cr30Ni70 | Cr15Ni60 | Cr20Ni35 | Cr20Ni30 | |
|---|---|---|---|---|---|---|---|
| composition | 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 | |
| Maximum temperature℃ | 1300 | 1200 | 1250 | 1150 | 1100 | 1100 | |
| Meltiing point ℃ | 1400 | 1400 | 1380 | 1390 | 1390 | 1390 | |
| Density(g/cm3) | 8.7 | 8.4 | 8.1 | 8.2 | 7.9 | 7.9 | |
| Resistivity | -- | 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 | -- | 18 | 17 | 17 | 19 | 19 | |
| Micrographic structure | -- | Austenite | Austenite | Austenite | Austenite | Austenite | |
| Magnetic properties | -- | Nonmagnetic | Nonmagnetic | Nonmagnetic | Nonmagnetic | Nonmagnetic |
Applications of Cr30Ni70 Nichrome Flat Wire Strip:
- Industrial Electric Furnaces: Reliable heating elements for heat treating, laboratory ovens, and high-temperature processing.
- Precision Resistors & Rheostats: Stable resistance wire for electrical components and load banks.
- Custom Heating Elements: Toasters, ovens, kilns, hot knives, 3D printer beds, and vacuum forming tools.
- Aerospace & Automotive: De-icing systems, sensor heaters, and high-reliability thermal management.
- Home & Industrial Appliances: Heating mats, cables, and specialty furnace components.
FAQ on Cr30Ni70 Nichrome Flat Wire Strip:
1.What is Cr30Ni70 Nichrome Flat Wire Strip used for?
It is primarily used as resistance heating material in electric furnace heating elements, precision resistors, and various high-temperature applications requiring stable resistivity and oxidation resistance.
2.What is the maximum operating temperature for this nichrome strip?
Up to 1250°C continuous service, suitable for most industrial furnace and resistor heating needs.
3.How does flat nichrome wire compare to round nichrome wire?
Flat strip provides greater surface area for improved heat dissipation and transfer, making it better for embedded heating elements and compact designs.
4.Is Cr30Ni70 suitable for custom resistor manufacturing?
Yes, its high resistivity and ductility make it ideal for winding or forming precision resistance wire and heater coils.
5.Does this nichrome alloy resist oxidation at high temperatures?
Yes, it develops a protective chromium oxide layer that prevents further degradation in air or oxidizing environments.
