Nickel-Chromium Alloy Wires
Cr30Ni70 resistance wire
- Features:
- Cr30Ni70 is a high-performance resistance alloy designed for excellent wear resistance and thermal stability. It is highly suitable for demanding aerospace applications. This high-resistance wire offers unmatched durability under extreme conditions. It is the top choice for aerospace engineers seeking reliable nickel-chromium heating elements and corrosion-resistant materials. Its chemical composition—30% chromium and 70% nickel—enables the wire to perform exceptionally well in high-temperature environments, providing long-term resistance to oxidation and mechanical wear. This alloy has high electrical resistivity and good oxidation resistance. It retains good ductility after use and has 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 with Cr20Ni80, Cr30Ni70 is suitable for applications that require 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 wire: width from 0.2 - 6.0mm and thickness from 0.08 - 1.0mm; Wide strip: width from 5.0 - 300mm and thickness from 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. continuous service 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 | 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.