Precision Constantan 6J40 Wire for Thermocouples and High-Accuracy Resistors

Our Precision Constantan 6J40 Wire is a high-performance material crafted for thermocouples and high-accuracy resistors. With a 40% nickel content, this copper-nickel alloy delivers exceptional resistivity, corrosion resistance, and thermal stability, making it a top choice for industries like aerospace, electronics, and industrial automation. Available in diameters from 0.01mm to 3mm, our Constantan 6J40 wire is engineered to meet the strictest tolerances, ensuring consistent quality for your most demanding projects.

The wire’s high resistivity—around 49 µΩ·cm at 20°C—makes it ideal for precision resistors and thermocouples requiring accurate electrical and thermal performance. It offers excellent corrosion resistance, even in harsh environments, and operates reliably up to 600°C. We’ve optimized our manufacturing process to deliver a wire that’s durable, reliable, and ready to perform in high-stakes applications, from aerospace sensors to industrial control systems.

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Constantan 6J40 is a powerhouse for precision applications. Its 40% nickel content gives it significantly higher resistivity than lower-nickel alloys like CuNi2, CuNi6, or CuNi8, making it perfect for high-accuracy resistors and thermocouples. Its low thermal conductivity (23 W/mK) ensures minimal heat loss, critical for precise temperature measurements, while its tensile strength (420 MPa) provides durability under mechanical stress.

The wire’s low temperature coefficient of resistance (TCR) ensures stable electrical properties across a wide temperature range, from -200°C to 600°C, making it ideal for thermocouples in high-temperature environments like aerospace or industrial furnaces. Its excellent corrosion resistance stands up to harsh conditions, such as chemical processing plants or marine settings, ensuring long-term reliability. For projects requiring top-tier precision and durability, Constantan 6J40 is the go-to material.

Parameter:

Properties Material	Resistivity 200c μΩ.m	Max working temperature (℃)	Tensile strength (Mpa)	Melting point (℃）	Density (g/cm3)	TCR *10-6/℃ (20-600℃）	EMF vs Cu (μV/℃） （0-100℃）
CuNi1	0.03	200	210	1085	8.9	＜100	-8
CuNi2	0.05	200	220	1090	8.9	＜120	-12
CuNi6	0.1	220	250	1095	8.9	＜60	-18
CuNi8	0.12	250	270	1097	8.9	＜57	-22
CuNi10	0.15	250	290	1100	8.9	＜50	-25
CuNi14	0.2	300	310	1115	8.9	＜30	-28
CuNi19	0.25	300	340	1135	8.9	＜25	-32
CuNi23	0.3	300	350	1150	8.9	＜16	-34
CuNi30	0.35	350	400	1170	8.9	＜10	-37
CuNi34	0.4	350	400	1180	8.9	0	-39
CuNi44	0.5	400	420	1200	8.9	＜-6	-43

Size Range
Wire	0.08-7.5mm
Ribbon	(0.05-0.35)*(0.5-6.0)mm
Strip	(0.50-2.5)*(5-180)mm
Rod	8-50mm

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The copper-nickel alloy market is booming, driven by growing demand for high-performance materials in aerospace, electronics, and renewable energy sectors. Thermocouples and precision resistors are seeing increased adoption as industries prioritize accurate temperature measurement and electrical control. The global thermocouple market is projected to grow at a CAGR of around 5.8% through 2030, fueled by advancements in aerospace, automotive, and industrial automation.

Constantan 6J40 wire is a key player in this landscape. Its high resistivity and corrosion resistance make it ideal for thermocouples and resistors in demanding applications, like aerospace sensors or industrial control systems. The rise of electric vehicles (EVs) and renewable energy systems, such as solar and wind, is boosting demand for durable alloys that can handle high temperatures and corrosive environments. Meanwhile, the push for precision in smart manufacturing and IoT systems is driving the need for reliable materials like Constantan 6J40.

Sustainability is a major trend shaping the industry. Companies are seeking eco-friendly materials to meet environmental regulations, and our Constantan 6J40 wire delivers. Produced with energy-efficient processes, it’s fully recyclable, helping you achieve green goals without sacrificing performance. The trend toward miniaturization in electronics is another driver, with industries demanding thinner wires for compact designs. Our ability to produce Constantan 6J40 wire as fine as 0.01mm positions us to meet this growing need.

Emerging technologies, like IoT-enabled sensors and advanced control systems, are increasing the demand for high-precision alloys. These systems require materials that maintain accuracy in challenging conditions, and Constantan 6J40 is up to the task. As industries continue to innovate, the demand for high-performance alloys like this will keep growing.

Applications of Constantan 6J40 Wire

Our Constantan 6J40 wire is a versatile material with a wide range of applications. Here’s where it makes an impact:

• Thermocouples: Its stable thermoelectric properties make it ideal for Type T, J, and E thermocouples in aerospace, industrial furnaces, and HVAC systems.

• High-Accuracy Resistors: The wire’s high resistivity is perfect for precision resistors in electronics, automotive, and telecommunications equipment.

• Aerospace Applications: Used in sensors and control systems for aircraft and spacecraft, it ensures reliability in high-temperature, corrosive environments.

• Industrial Automation: Its accuracy and durability make it a staple in sensors and resistors for smart manufacturing and control systems.

• Renewable Energy: In solar and wind energy systems, it’s used in thermocouples and resistors that require high precision in outdoor conditions.

• Chemical Processing: Its corrosion resistance makes it suitable for sensors and electrical components in chemical plants handling aggressive substances.

Its flexibility also makes it suitable for custom applications, like high-precision circuit breakers and conductive elements, where reliability and accuracy are critical.

Comparison Table: Constantan 6J40 vs. CuNi8 vs. CuNi6 vs. CuNi2

Property	Constantan 6J40	CuNi8	CuNi6	CuNi2
Nickel Content (%)	40	8	6	2
Resistivity at 20°C (µΩ·cm)	49	20	15	8
Max Operating Temp (°C)	600	350	300	250
Thermal Conductivity (W/mK)	23	45	50	65
Tensile Strength (MPa)	420	260	250	220
Corrosion Resistance	Excellent	Very Good	Good	Good
Thermocouple Types	T, J, E	T, J	T, J	T, J
Applications	Thermocouples, resistors	Sensors, resistors	Thermocouples, resistors	Resistors, heating

We’re not just a supplier—we’re a leader in delivering high-quality Constantan 6J40 Wire. Here’s why we stand out:

• Precision Manufacturing: Our advanced processes produce wires with tight tolerances, from 0.01mm to 3mm in diameter, ensuring consistent performance for your applications.

• Custom Solutions: We offer fully customizable wire sizes and configurations to meet your specific needs, whether for thermocouples, resistors, or sensors.

• Rigorous Quality Control: Every batch undergoes extensive testing in our state-of-the-art labs, meeting ASTM and ISO9001 standards for chemical and physical properties.

• Global Expertise, Local Support: With over 40 years of experience, we export to more than 70 countries and provide dedicated support to ensure your projects succeed.

• Eco-Friendly Production: Our energy-efficient processes and recyclable materials help you meet sustainability goals without compromising quality.

• Fast Delivery: Our streamlined production and logistics ensure quick turnaround times, even for custom orders, keeping your projects on schedule.

Compared to others, our focus on precision, customization, and sustainability gives us a clear edge. We deliver a product that’s tailored to your needs and built to perform in demanding environments.

Looking Forward

The future of Constantan 6J40 Wire is bright. As industries like aerospace, electronics, and renewable energy continue to grow, the demand for high-precision, corrosion-resistant alloys will soar. We’re committed to staying ahead, investing in R&D to enhance our wire’s properties and meet emerging challenges. From developing finer wires for compact sensors to improving thermal stability for next-generation applications, we’re always innovating.

Our Constantan 6J40 wire is a critical component in the systems driving modern industries. From thermocouples in aerospace systems to resistors in smart manufacturing, it’s a small but essential part of the bigger picture. We’re excited to support our customers in building reliable, sustainable solutions for the future.

For more details, pls directly contact us.

About Us:

Our 12,000㎡ factory is equipped with complete capabilities for research, production, testing, and packaging. We strictly adhere to ISO 9001 standards in our production processes, with an annual output of 1,200 tons. This ensures that we meet both quantity and quality demands. Furthermore, all products undergo rigorous simulated environment testing including high temperature, high pressure, and corrosion tests before being dispatched, ensuring they meet customer specifications. 

For all our clients, we offer timely and multilingual after-sales support and technical consulting, helping you resolve any issues swiftly and efficiently.

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FAQs：

1. What is Precision Constantan 6J40 Wire used for?
   It’s used for thermocouples, high-accuracy resistors, and precision electrical components in industries like aerospace, electronics, and industrial automation.

2. Why is Constantan 6J40 ideal for thermocouples?
   Its high resistivity and stable thermoelectric properties ensure accurate temperature measurements across a wide temperature range.

3. Which industries rely on Constantan 6J40 Wire?
   Aerospace, electronics, automotive, renewable energy, and industrial automation use it for thermocouples and resistors.

4. How does Constantan 6J40 compare to other copper-nickel alloys?
   With 40% nickel, it offers higher resistivity and better corrosion resistance than CuNi2 or CuNi6, ideal for precision applications.

5. What are the temperature limits for Constantan 6J40 Wire?
   It operates reliably from -200°C to 600°C, suitable for high-temperature thermocouple applications.

6. Is Constantan 6J40 resistant to corrosion?
   Yes, it provides excellent corrosion resistance, even in harsh environments like chemical processing or marine settings.

7. Can Constantan 6J40 Wire be customized for specific projects?
   We offer customizable wire diameters, from 0.01mm to 3mm, tailored to meet your project requirements.

8. What’s the lifespan of Constantan 6J40 in thermocouple applications?
   With proper use, it delivers consistent performance for years, even in demanding high-temperature environments.