TMA 6350® Alumina Forming Austenitic Alloy

In 2018 Duraloy announced our TMA 6350® alloy, a groundbreaking Alumina Forming Austenitic Alloy (AFA) resulting from collaboration with Oak Ridge National Laboratories (ORNL) and support from the U.S. Department of Energy. Since then, the market response to TMA 6350® has been overwhelmingly positive with installations at several of the largest chemical producers in the world. After rigorous testing, refining the melting and casting processes and creating several ASME Section IX approved weld procedures Duraloy is continuing to take over the market with several more furnaces scheduled for shipment and installation in the latter half of 2023.

TMA 6350® is a modified version of the standard 25% Chrome – 35% Nickel + Nb alloy with additions of aluminum and other critical microalloying elements. The key feature of this alloy lies in its ability to form a durable alumina-oxide film on the internal surface of the tubes. This alumina film prevents carbon from building up and resists carbon penetration, contributing to improved performance and longevity. An additional advantage of TMA 6350® is its ability to regenerate the alumina-oxide layer. In case of damage, erosion or flaking of the oxide film a fresh layer of alumina-oxide forms, ensuring continuous protection.

For more information on TMA 6350® please contact Roman Pankiw ( or Rick Kauffman (