INVAR 36

Dong-A Special Metals, Inc.

In recent years, the demand for ultra-high strength INVAR 36 has grown steadily. This is due to rapid advancements in precision control technologies and the rise of industries requiring high structural stability and low thermal expansion. From aerospace and semiconductors to power transmission and measurement devices, INVAR 36 is emerging as a core material for high-value applications.


What Is Ultra-High Strength INVAR 36?

INVAR 36 is part of the traditional INVAR alloy family, named for its invariable (low thermal expansion) characteristics. It is an iron-nickel-based alloy containing approximately 36% nickel, which is specially processed through cold working and precision heat treatments. These techniques give the material:

- High tensile strength

- Low coefficient of thermal expansion (≈1.2 × 10⁻⁶/K)

- Excellent dimensional stability

- Enhanced structural durability

Unlike standard INVAR, ultra-high strength INVAR 36 offers superior mechanical properties while retaining thermal stability. It performs reliably in extreme temperatures, particularly within the -100℃ to +200℃ range.


Key Industrial Applications of INVAR 36

Ultra-high strength INVAR 36 is used where precision and durability are essential. Applications include:

- Aerospace structural components

- Semiconductor manufacturing systems

- Precision measuring instruments

- Power transmission cable cores

- Energy infrastructure in coastal and high-temperature areas

Due to its minimal thermal expansion and high strength, it ensures structural stability and long-term reliability in mission-critical systems.


Revolutionizing Power Transmission Infrastructure

One of the most promising applications of ultra-high strength INVAR 36 is in power transmission lines. With aging power grids—especially those installed during the 1970s and 1980s—modern utilities face increasing risks from sagging cables, high resistance losses, and safety concerns due to thermal expansion. This is further complicated by the growing impact of climate change.


INVAR 36 addresses these issues by:

- Reducing sagging in high-temperature conditions

- Maintaining mechanical strength under thermal stress

- Increasing the lifespan and reliability of transmission cables

These features make it a superior alternative to conventional aluminum conductor steel reinforced (ACSR) cables.


Leading Global Adoption and Market Growth

Sumitomo Electric Industries of Japan leads the development of EHS (Extra High Strength) INVAR 36 cables, now used in grid upgrades across Japan, the U.S., and Europe. These cables provide:

- High tensile strength

- Excellent thermal resistance

- Long-distance transmission stability

- Support for carbon-neutral energy infrastructure

As renewable energy capacity expands, and as the replacement of old grids becomes urgent, global demand for high-performance alloys like INVAR 36 will continue to rise.


Challenges and Future Outlook

Despite its advantages, INVAR 36’s high production cost and specialized manufacturing requirements limit its broader application compared to traditional INVAR. However, as carbon neutrality, energy efficiency, and long-term infrastructure reliability gain importance, ultra-high strength INVAR 36 is poised to become a key strategic material in precision industries.


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