INVAR 36

Dong-A Special Metals, Inc. is proud to introduce ultra-high strength Invar 36, an advanced iron-nickel (Fe-Ni) alloy that delivers exceptional dimensional stability and mechanical performance. Composed of approximately 36% nickel, this alloy maintains an extremely low coefficient of thermal expansion (CTE), even during repeated temperature changes, making it a preferred material in high-precision and power-critical applications.


What Is Invar 36?

Invar 36 is a nickel-iron alloy known for its remarkable resistance to thermal expansion. The unique crystal structure, influenced by its 36% nickel content, allows Invar 36 to maintain its shape and dimensions near room temperature and beyond. This stability is essential in environments that require consistent performance under thermal stress.


Ultra-High Strength with Dimensional Stability

Ultra-high strength Invar 36 retains its low thermal expansion characteristics while improving yield strength and toughness through advanced heat treatments and alloy modifications. The material remains magnetically stable and durable in both low- and high-temperature environments, expanding its use beyond precision instruments to:

- Aerospace and satellite structures

- Electronic housings

- Power grid components

- High-precision measurement tools


Key Industrial Application: Core Material for High-Voltage Cables

One of the most innovative applications of ultra-high strength Invar 36 is in aluminum conductor composite core cables (ACCC). Traditional steel cores can cause sagging when heated. However, Invar 36's negligible thermal expansion and high tensile strength significantly reduce cable sag during high-temperature operations, such as:

- Peak electricity demand periods

- Solar radiation exposure

- Long-distance transmission lines

This feature is especially important in high-voltage transmission networks, which are facing growing performance and maintenance demands.


Reliability and Maintenance Advantages

Ultra-high strength Invar 36 is also fatigue-resistant. It withstands decades of environmental stress, including vibration, wind, and temperature changes. This extends the lifespan of power transmission systems and reduces long-term maintenance costs, making it a sustainable and cost-effective material choice.


Strategic Importance in the U.S. Power Grid Modernization

The U.S. faces a pressing challenge: over 70% of transmission lines are more than 40 years old. Issues such as:

- Mechanical fatigue

- Thermal sag

- Insulation breakdown

have become common. The U.S. Department of Energy (DOE) has therefore prioritized the modernization of transmission infrastructure to support renewable energy and EV charging.

In response, global materials leaders like Sumitomo Electric are supplying advanced Invar 36-based cables to U.S. markets. Grid operators like PJM, ERCOT, and NYISO are currently conducting field trials using these next-generation cables.


Growing Global Demand for Invar 36

Beyond the U.S., developed nations such as Japan, South Korea, and EU member states are rapidly adopting Invar 36 composite cables. The material is seen as a strategic solution for:

- Reducing CO₂ emissions

- Minimizing power loss

- Enhancing grid reliability

With the global transition toward smart grids and carbon neutrality, the demand for ultra-high strength Invar 36 is projected to grow significantly in the mid- to long-term.



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Company Catalog Download :

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1) Eng : https://blog.naver.com/dongaspecial/223683548933

2) Kor : https://blog.naver.com/dongaspecial/223683546036

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