Jiangyin Chengxin Alloy Material Co., Ltd ，
Jiangsu Xiangcheng Supply Chain Management Co. LTD
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NF38 Nickel Content 50-55 PTC Ni-Fe Alloy Wire Rod for Precise Resistance Control in Thermistors and Sensors, Resistance 0.38
The product exhibits a resistivity of 0.38 at a temperature of 20°C, with a tolerance range of ±0.02.
PTC Ni-Fe alloy NF38 Ni50%-55% is a nickel-iron alloy with a composition of 50-55% nickel and 45-50% iron, known for its positive temperature coefficient (PTC) characteristics. As temperature increases, this alloy's electrical resistance rises, making it ideal for applications that require temperature-sensitive or self-regulating properties. Ni50%-55% alloy combines moderate electrical resistivity with strong thermal stability, providing consistent performance across a broad temperature range.
This alloy is commonly used in temperature sensors, thermistors, and self-regulating heating elements, where precise resistance control is essential. It is also well-suited for overcurrent protection devices, such as circuit breakers and fuses, as its resistance increases with heat, effectively limiting current flow in response to high temperatures and preventing circuit damage. NF38 offers good corrosion and oxidation resistance, allowing it to perform reliably in harsh conditions, which is particularly beneficial in automotive, aerospace, and industrial applications.
In addition, the alloy is used in battery management systems and other thermal control applications, where effective temperature regulation is critical for safety and efficiency. With its dependable thermal response, durability, and versatility, NF38 is a trusted material for advanced thermal management and protective applications across various industries.
| Main Chemical Composition Wt.% NF38 PTC Ni-Fe Alloy | % | Ni | Fe |
| Min | 50 | ||
| Max | 55 | Bal. |
Key features of PTC Ni-Fe alloy with NF38 include:
This alloy can achieve a very low coercive field, which is beneficial for high precision torque sensors
Additions of copper or chromium & titanium can effectively reduce the remanence and the coercive field of the alloy
The alloy has a tuned Curie point and Hopkinson peak, which are driving new non-contact temperature sensing technology
When austenitic, Fe-Ni materials exhibit great plasticity and soft magnetic material behavior with low magnetic anisotropy energies
At room temperature, the alloy has a medium amplitude of saturation polarization (0.3 < Jsat ≤ 1.5 T)
Industrial austenitic FeNi(Cr,Mo,etc) alloys are characterized by a low Curie point (20 < Tc < 450°C)
Induced anisotropy Ku, obtained by magnetic annealing of wound core, lowers the magnitudes of Jr and µ
The optimization is controlled by lowering the number of precipitates whose size is close to the domain wall thickness
Applications:
These applications highlight the versatility of Ni-50-55 alloy in various technological and industrial sectors, particularly where specific magnetic properties are required.
Resistance Values and Naming Conventions for PTC Ni-Fe Alloy Wires
| Alloy brand | 20℃ Resistivity | The tolerance range | ||||
| NF13 | 0.13 | ±0.02 | ||||
| NF15 | 0.15 | ±0.02 | ||||
| NF20 | 0.20 | ±0.02 | ||||
| NF23 | 0.23 | ±0.02 | ||||
| NF25 | 0.25 | ±0.02 | ||||
| NF32 | 0.32 | ±0.02 | ||||
| NF36 | 0.36 | ±0.02 | ||||
| NF38 | 0.38 | ±0.02 | ||||
| NF40 | 0.40 | ±0.02 | ||||
| NF43 | 0.43 | ±0.02 | ||||
| NF46 | 0.46 | ±0.02 | ||||
| NF52 | 0.52 | ±0.02 | ||||
| NF60 | 0.60 | ±0.02 | ||||
Chemical Composition of Different Models of PTC Ni-Fe Alloy Wire
| Alloy brand | Chemical element | ||||
| Ni % | Fe % | ||||
| NF13 | 85-95 | Rest | |||
| NF15 | 75-85 | Rest | |||
| NF20 | 70-75 | Rest | |||
| NF23 | 60-65 | Rest | |||
| NF25 | 60-65 | Rest | |||
| NF32 | 50-55 | Rest | |||
| NF36 | 50-55 | Rest | |||
| NF38 | 50-55 | Rest | |||
| NF40 | 50-55 | Rest | |||
| NF43 | 45-50 | Rest | |||
| NF46 | 45-50 | Rest | |||
| NF52 | 45-50 | Rest | |||
| NF60 | 45-50 | Rest | |||
Temperature Coefficients of Different Models of PTC Ni-Fe Alloy Wire
| Alloy brand | 120℃ Temperature coefficient PPM | The tolerance range PPM | ||||||||||||
| NF13 | 4200 | ±300 | ||||||||||||
| NF15 | 4400 | ±300 | ||||||||||||
| NF20 | 4500 | ±300 | ||||||||||||
| NF23 | 4800 | ±300 | ||||||||||||
| NF25 | 4600 | ±300 | ||||||||||||
| NF32 | 4200 | ±300 | ||||||||||||
| NF36 | 3800 | ±300 | ||||||||||||
| NF38 | 4000 | ±300 | ||||||||||||
| NF40 | 3800 | ±300 | ||||||||||||
| NF43 | 3400 | ±300 | ||||||||||||
| NF46 | 3200 | ±300 | ||||||||||||
| NF52 | 3000 | ±300 | ||||||||||||
| NF60 | 2500 | ±300 | ||||||||||||
Mechanical properties (tensile strength)
| Category | Diameter range mm | Elongation rate ≥ % | |
| Cold drawn wire | 0.05 ＞ d ＜ 0.1 | ≥ 18 | |
| 0.1 ＞ d ＜ 0.3 | ≥ 20 | ||
| 0.3 ＞ d ＜ 0.5 | ≥ 20 | ||
| 0.5 ＞ d ＜ 1.0 | ≥ 20 | ||
Size (diameter)
| Alloy Code | Diameter mm | |||||
| Wire | Rod | Wire rod | ||||
| NF13 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF15 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF20 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF23 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF25 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF32 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF36 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF38 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF40 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF43 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF46 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF52 | 0.05-8.0 | 12-30 | 8-14 | |||
| NF60 | 0.05-8.0 | 12-30 | 8-14 | |||
Support and Services:
1. Technical Consultation
2. Product Selection
3. Time Guarantee
4. Warranty and After-Sales Support
Q&A:
1. What is the minimum order quantity?
The MOQ is 5kg, but if you need samples, please contact us.
2. Are your products safe and environmentally friendly?
Our products have passed the SGS test report, for the European Chemicals Agency and WTO concern SVHC content below the specified 0.1%, and passed the ISO9001 quality system certification.
2. How to choose products with different diameters and resistivity
We have product experts who are familiar with the use of the scenario to help determine the product, you can send email or contact us via chat software.
