Cr20Ni35 Heat Resistant Nickel Chromium Iron Alloy with High Positive Temperature Coefficient

Cr20Ni35 Heat-Resistant Nickel-Chromium-Iron Alloy with High Positive Temperature Coefficient

Main characteristics of Ni-Cr and Ni-Cr-Fe electric heating alloys

Key Features of NiCr Alloy Wire Cr20Ni35:

• Composition:

Nickel (Ni): 35% (provides excellent high-temperature stability and good electrical resistivity).

Chromium (Cr): 20% (enhances oxidation resistance and improves strength at high temperatures).

Iron (Fe): The balance, used to enhance the overall mechanical properties of the alloy.

Carbon (C): Low content to improve machinability and prevent carbide precipitation during heat exposure.

• High-Temperature Resistance:

Designed to withstand continuous exposure to temperatures up to 1100°C (2012°F).

Maintains strength and stability at elevated temperatures, making it suitable for resistive heating applications and other high-heat environments.

• Oxidation and Corrosion Resistance:

Oxidation Resistance: The alloy has a high degree of oxidation resistance due to the chromium content, which forms a stable oxide layer that prevents further oxidation.

Corrosion Resistance: With its significant chromium content, it also offers resistance to corrosion in many environments, particularly oxidizing atmospheres at high temperatures.

• Electrical Resistivity:

Stable Electrical Resistivity: Offers a predictable and stable resistance under high temperatures, making it ideal for heating elements, resistors, and thermocouples.

Good Heat Generation Efficiency: Due to its resistive properties, it generates heat efficiently when used in electrical heating applications.

• Mechanical Properties:

Strength and Ductility: Provides good tensile strength at high temperatures and remains ductile enough for fabrication.

Thermal Fatigue Resistance: Resistant to thermal cycling, making it ideal for applications that undergo repeated heating and cooling cycles.

• Weldability and Fabrication:

Weldable: Can be welded using standard welding techniques such as TIG (GTAW) and MIG (GMAW) welding, with minimal risk of cracking or other issues.

Formability: Easily drawn into wires, rods, and other shapes for a variety of applications, particularly in heating elements and electrical components.

​Applications:

• Heating Elements: Commonly used in industrial furnaces, electric heating elements, and ovens where high-temperature stability is critical.
• Resistors: Used in the manufacturing of precision resistors and resistor grids that require stable electrical resistance.
• Thermocouples and Sensors: Suitable for high-temperature thermocouples and temperature sensing elements.
• Electrical Components: Often found in electrical heating components such as toasters, dryers, water heaters, and other similar products.
• High-Temperature Applications: Also used in some chemical processing applications that require materials resistant to high heat and oxidation.

Technical data of wires

The tolerance or wires diameter

Technical data of ribbon

Advantages of NiCr Alloy Wire Cr30Ni35:

• High-Temperature Performance: Excellent resistance to high-temperature oxidation, making it suitable for environments up to 1100°C (2012°F).
• Good Electrical Resistivity: Ideal for use in heating elements, resistors, and other electrical applications where stable resistivity is required.
• Corrosion Resistance: Resists corrosion in a range of high-temperature, oxidizing conditions.
• Fatigue and Thermal Cycling Resistance: Withstands repeated heating and cooling without degradation.
• Fabrication Flexibility: Can be easily fabricated into wire forms for a range of applications, especially in industrial and electrical environments.

Limitations of NiCr Alloy Wire Cr30Ni35:

• Cost: As with most high-performance alloys, it may be more expensive compared to other metals like stainless steel, which may limit its application in cost-sensitive areas.
• Limited Resistance to Strong Acids: While it is highly resistant to oxidation, it may not perform as well in strongly acidic or highly corrosive environments compared to specialized alloys like Inconel or Hastelloy.
• Cold Work Hardening: Can work-harden during cold-forming processes, requiring specialized handling or processing methods to prevent cracking or damage.

Company Overview:

Jiangyin Chengxin Alloy Material Co., Ltd has more than 20 years of experience as the lead.ing alloy wire manufacturer in China. We offer a wide range of services from fine wire drawing toresistance wire manufacturing. Since the beginning, our specialty has been the quality and preci.sion of our products. We have the tightest tolerances and deliver within a few days to a fewweeks. As a result, we have become the leading alloy wire supplier in the industry.

Senphus Subsidiaries:

• Jiangyin Chengxin Alloy Material Co., Ltd.
• Jiangyin Senphus Electrical Materials Co., Ltd.
• Jiangsu Xiangcheng Supply Chain Management Co., Ltd.

Jiangyin Chengxin Alloy Material Co., Ltd.: With nearly 20 years of experience, Jiangyin Chengxin is a leading alloy wire manufacturer in China. We offer a wide range of services, from fine wire drawing to resistance wire manufacturing. Our specialty lies in the quality and precision of our products, achieving the tightest tolerances and delivering orders within days to weeks. As a result, we have established ourselves as the premier supplier of alloy wire in the industry.

Our product range includes:

• Copper-nickel alloys (CuNi1-CuNi44)
• Karma (Nikrothal L/Evanohm/Alloy 800)
• Manganin and Constantan
• Nickel-chromium alloys
• Thermocouple alloys (Type K, N, E, T, J)
• Thermocouple extension wire
• PTC thermistor resistance alloy
• Pure nickel wire and Monel alloy

These alloys are available in various forms, including wire, ribbon, stranded, and enamelled. Major applications include seat heating, underfloor heating, military projects, aerospace, household appliances, heating wire, mechanical and electrical plants, and temperature instruments. Our manufacturing processes are ISO 9001:2015 certified, and we specialize in fine and ultra-fine wire drawing, offering wire diameters from 0.025 mm (0.001") to 13 mm (0.51") in small batches, medium volumes, and mass production. We maintain a comprehensive quality inspection system, including in-house chemical analysis, chromatographic analysis, metallurgical analysis, pinhole tests, wire construction tests, and tension tests to ensure the highest quality standards.

Senphus Electrical Material Co., Ltd.: Founded in 2003, Senphus Electrical Material Co., Ltd. integrates research, manufacturing, and sales of electric heating alloys, heating cables, heating wires, and heating products. Leveraging over a decade of technical expertise in heating alloy wire, we have adopted advanced heating cable technology and machinery, successfully developing heating cables, temperature controllers, and temperature control systems suitable for building heating, pipe insulation, outdoor snow melting, wind power blade production, car seat heating, and healthcare applications.

The company is recognized as a high-tech enterprise in Jiangsu Province and a small giant enterprise in Jiangyin City, specializing in innovative technologies. We operate the "Wuxi Heating Cable Engineering Technology Research Center" and collaborate with experts from renowned domestic universities. Our portfolio includes 5 invention patents and over 30 utility model patents, showcasing our strong research and development capabilities.

With an annual output exceeding 1,000 tons of thermal alloy wire and an output value of approximately 105 million yuan, our products are well-received in markets such as the UK, Italy, Canada, Peru, and Spain. Our heating cables generate an annual output value of over 80 million yuan, with exports to Germany, Japan, the United States, Malaysia, Denmark, Brazil, and other countries.

The company has successfully passed multiple quality management system certifications, including IATF 16949, ISO 9001, ISO 14001 (Environmental Management System), and ISO 45001 (Occupational Health and Safety Management System). Our heating cables and related products have also obtained test reports from the Shanghai Cable Research Institute Test Center and received certifications such as UL (United States), VDE (Germany), CE (European Union), and RoHS.

Commitment to Quality: We adhere to the business commitment of "Reputation First, Quality First, Customer First" and uphold the quality policy of "Integrity-Based, Quality-Oriented, Excellent Service." We are dedicated to providing accurate products and professional services, and we look forward to collaborating sincerely with you to achieve mutual success.