Nickel-Chromium Resistance Wires
Cr30Ni70 Nichrome wire
- Features:
- Cr30Ni70 is a high-performance corrosion-resistant alloy designed for excellent corrosion resistance and thermal stability. It is ideal for demanding aerospace applications. This high-resistance wire offers unmatched durability under extreme conditions. It is the preferred choice for aerospace engineers seeking reliable nickel-chromium heating elements and corrosion-resistant materials. Its chemical composition—30% chromium and 70% nickel—allows the wire to perform excellently in high-temperature environments, providing long-term oxidation resistance and mechanical wear capability. The alloy has high resistivity as well as good plasticity and formability. It maintains good ductility after use and features excellent weldability.
- Cr30Ni70 Resistance Wire is also known as Nikrothal 70, Chromel 70/30, N7, Hytemco, HAI-NiCr 70, Balco, Tophet 30, Resistohm 70, Cronix 70, Stablohm 710,70/30 Nichrome, NiCr70/30
- Advantages:
- Compared to Cr20Ni80, Cr30Ni70 is suitable for applications that need higher oxidation resistance, better corrosion resistance and higher electrical resistivity. Although Cr20Ni80 remains popular for general heating applications, Cr30Ni70 is the preferred choice in harsh environments demanding higher chemical tolerance and electrical performance.
- Specifications:
- Bright and soft annealed finish: 0.025 - 1.6mm; Acid-pickled finish: 1.0 -12.0mm; Rods: 6.0-150.0mm
Flat wires: width 0.2 - 6.0mm and thickness 0.08 - 1.0mm; Strips: width 5.0 - 300mm and thickness 0.05 - 4.0mm
Product Description
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Chemical Composition:| C | P | S | Mn | Si | Cr | Ni | Al | Fe |
|---|---|---|---|---|---|---|---|---|
| ≤ | ||||||||
| 0.08 | 0.02 | 0.015 | 0.6 | 0.75~1.6 | 28.0~31.0 | Remainder | ≤0.5 | ≤1.0 |
| Max. Operating Temp. | 1250ºC | Resistivity at 20ºC (μΩ·m) | <0.50mm 1.18±0.05 ≥0.50mm 1.20±0.05 |
| Density | 8.10 g/cm3 | Thermal conductivity(20ºC) | 14 W/(m·K) |
| Average linear expansion coefficient(20-1000ºC) | 17.0×10-6/K | Specific heat capacity | 0.46 J/(g·K) |
| Approx. melting point | 1380ºC | Elongation after Fracture (A/%) |
Diameter≤3.0mm: ≥20% Diameter>3.0mm: ≥25% |
| Tensile strength(Rm/MPa) | ≥650 | Accelerated life test | ≥50h/1250ºC |
| Micrographic structure | Austenite | Magnetic properties | Nonmagnetic |
|
Diameter
(mm) |
Ohm per meter (20ºC Ω/m) |
Length per kg
(m/kg) |
Weight per meter
(g/m) |
Diameter
(mm) |
Ohm per meter (20ºC Ω/m) |
Length per kg
(m/kg) |
Weight per meter
(g/m) |
|---|---|---|---|---|---|---|---|
| 0.05 | 600.970 | 62876.08 | 0.01590 | 1.1 | 1.2627 | 129.91 | 7.69768 |
| 0.06 | 417.340 | 43663.94 | 0.02290 | 1.2 | 1.0610 | 109.16 | 9.16088 |
| 0.07 | 306.617 | 32079.63 | 0.03117 | 1.3 | 0.9041 | 93.01 | 10.75131 |
| 0.08 | 234.754 | 24560.97 | 0.04072 | 1.4 | 0.7795 | 80.20 | 12.46897 |
| 0.09 | 185.484 | 19406.20 | 0.05153 | 1.5 | 0.6791 | 69.86 | 14.31387 |
| 0.1 | 150.242 | 15719.02 | 0.06362 | 1.6 | 0.5968 | 61.40 | 16.28600 |
| 0.11 | 124.167 | 12990.93 | 0.07698 | 1.7 | 0.5287 | 54.39 | 18.38537 |
| 0.12 | 104.335 | 10915.99 | 0.09161 | 1.8 | 0.4716 | 48.52 | 20.61197 |
| 0.13 | 88.901 | 9301.20 | 0.10751 | 1.9 | 0.4232 | 43.54 | 22.96581 |
| 0.15 | 66.774 | 6986.23 | 0.14314 | 2.0 | 0.3820 | 39.30 | 25.44688 |
| 0.17 | 51.987 | 5439.11 | 0.18385 | 2.2 | 0.3157 | 32.48 | 30.79072 |
| 0.19 | 41.618 | 4354.30 | 0.22966 | 2.4 | 0.2653 | 27.29 | 36.64351 |
| 0.21 | 34.069 | 3564.40 | 0.28055 | 2.6 | 0.2260 | 23.25 | 43.00523 |
| 0.25 | 24.039 | 2515.04 | 0.39761 | 2.8 | 0.1949 | 20.05 | 49.87588 |
| 0.27 | 20.609 | 2156.24 | 0.46377 | 3.0 | 0.1698 | 17.47 | 57.25548 |
| 0.29 | 17.865 | 1869.09 | 0.53502 | 3.2 | 0.1492 | 15.35 | 65.14401 |
| 0.31 | 15.634 | 1635.69 | 0.61136 | 3.4 | 0.1322 | 13.60 | 73.54148 |
| 0.35 | 12.265 | 1283.19 | 0.77931 | 3.6 | 0.1179 | 12.13 | 82.44789 |
| 0.40 | 9.390 | 982.44 | 1.01788 | 3.8 | 0.1058 | 10.89 | 91.86323 |
| 0.45 | 7.419 | 776.25 | 1.28825 | 4.0 | 0.0955 | 9.82 | 101.78752 |
| 0.50 | 6.112 | 628.76 | 1.59043 | 4.5 | 0.0755 | 7.76 | 128.82482 |
| 0.55 | 5.051 | 519.64 | 1.92442 | 5.0 | 0.0611 | 6.29 | 159.04299 |
| 0.60 | 4.244 | 436.64 | 2.29022 | 5.5 | 0.0505 | 5.20 | 192.44202 |
| 0.65 | 3.616 | 372.05 | 2.68783 | 6.0 | 0.0424 | 4.37 | 229.02191 |
| 0.70 | 3.118 | 320.80 | 3.11724 | 6.5 | 0.0362 | 3.72 | 268.78266 |
| 0.80 | 2.387 | 245.61 | 4.07150 | 7.0 | 0.0312 | 3.21 | 311.72427 |
| 0.85 | 2.115 | 217.56 | 4.59634 | 7.5 | 0.0272 | 2.79 | 357.84674 |
| 0.90 | 1.886 | 194.06 | 5.15299 | 8.0 | 0.0239 | 2.46 | 407.15006 |
| 0.95 | 1.693 | 174.17 | 5.74145 | 8.5 | 0.0211 | 2.18 | 459.63425 |
| 1.00 | 1.528 | 157.19 | 6.36172 | 9.0 | 0.0189 | 1.94 | 515.29930 |
The above parameters are based on Chinese National Standard GB/T1234-2012. The tolerance of resistance per meter: 0.03-0.06mm is ±10%; 0.07-0.12mm is ±8%; 0.13-0.17mm is ±7%; 0.18-0.32mm is ±6%; A wire diameter above 0.32mm is ±5%. We provide nickel-chromium alloy products in various shapes, such as wires, ribbons, and rods. Other alloys like Cr20Ni80, Cr15Ni60 and Cr20Ni35/Cr20Ni30 are also available upon request.