Inconel 738

Introduction: What is Inconel 738?

Inconel 738 is a nickel-based superalloy specifically developed for high-temperature casting applications. Originally engineered by General Electric (GE) for aviation engines, it has gained wide use in extreme environments such as gas turbines, where mechanical strength, oxidation resistance, and structural integrity are essential.


Composition and Strengthening Mechanism

Inconel 738 is a multi-element alloy composed primarily of nickel (Ni), with significant additions of chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), titanium (Ti), and tantalum (Ta). These elements work together to enhance its tensile strength, oxidation resistance, and especially its resistance to creep fracture at temperatures exceeding 980°C.


Mechanical Properties at Elevated Temperatures

This alloy is known for its long-term mechanical stability under extreme heat and load. Its exceptional creep resistance and microstructural integrity make it ideal for turbine components that operate continuously in high-pressure and high-temperature conditions, such as those found in power generation facilities.


Applications in Aerospace and Gas Turbines

Inconel 738 is widely used in aviation and stationary gas turbines (STGs), particularly in parts like turbine blades, rectifiers, and combustion chambers. These components must endure high-velocity hot gases, demanding both thermal resistance and mechanical strength over extended lifetimes.


Casting Characteristics and Heat Treatment

Designed as a precision-cast superalloy, Inconel 738 offers excellent casting fluidity and shape stability. The alloy is typically manufactured through vacuum precision casting, followed by a two-step heat treatment process: solution treatment and aging. This process fine-tunes the alloy’s mechanical properties by controlling the distribution of strengthening precipitates.


Recycling Value and Strategic Metal Recovery

Inconel 738 scrap holds substantial economic value due to its high content of critical elements like nickel, cobalt, molybdenum, and tantalum. These metals are categorized as strategic resources with unstable global supply chains. Hence, components that have reached end-of-life are recycled through remelting and refining, rather than discarded.


Korea's Advancing High-Temperature Alloy Recycling Industry

In Korea, the recycling of high-temperature superalloy scrap such as Inconel 738 is gaining momentum. Technological advancements in recovery and refining are helping reduce dependency on imports and boosting national resource security. Dong-A Special Metals plays a vital role in this ecosystem through specialized scrap processing and remelting solutions.


Future Prospects in Energy and Carbon-Neutral Technologies

The importance of Inconel 738 is expected to grow in next-generation energy systems, including hydrogen turbines, small modular reactors (SMRs), and high-efficiency gas power plants. In ultra-high temperature environments, materials like Inconel 738 are indispensable for ensuring safety, efficiency, and longevity.

Moreover, as the world shifts toward carbon neutrality, the demand for recyclable, heat-resistant alloys will increase. The recycling industry for high-performance alloys is poised to become a core pillar of sustainable industrial development.




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