Dear Reader,

The industrial landscape continues to undergo profound changes—driven not only by digital transformation and geopolitical realignments, but most urgently by the transition in our energy systems. In his editorial, Dr. Joachim G. Wünning challenges us to face uncomfortable truths: that climate change remains one of the greatest threats of our time, and that the continued reliance on cheap, subsidized fossil fuels impedes innovation and long-term sustainability. In an energy-intensive sector like thermal processing, the pressure to rethink and restructure is not new—but it is growing ever more urgent. Against this backdrop, this issue of heat processing explores the technological, economic, and strategic developments shaping the future of our industry.

This issue showcases key advances in research and application. Highlights include machine learning for analyzing complex steel microstructures, new approaches to calorific value determination amid fluctuating gas quality, and the innovative CTMT process combining casting with thermomechanical treatment. We also take a closer look at the design of vacuum chamber furnaces. In our “American Insights” section, you’ll find fresh perspectives on boronizing and how 3D-printed coils are outperforming traditional components.

This issue’s special focus is on the transformation of hardening technologies. As heat treatment evolves beyond conventional hardening, modern approaches like low-pressure carbonitriding, intelligent quenching, and hybrid thermal processes enable tailored solutions for wear and corrosion protection. AI-driven optimization and flexible technologies support a shift toward system-level thinking—where factors like component geometry, material, and load conditions define the ideal treatment strategy. The result: a more precise, adaptive, and efficient future for thermal processing.

We also take you inside the HärtereiPraxis 2025 and present a strategic outlook on Germany’s heat treatment sector. With pressures from energy costs and global competition mounting, these insights offer valuable orientation for industrial decision-makers.

Our interview with Prof. Dr. Egbert Baake of Leibniz University Hannover sheds light on the renaissance of electric heat treatment and how electrification and digital control are setting new standards in sustainability and flexibility.

We hope this edition of heat processing offers you stimulating perspectives and new inspiration for your work.

Wishing you an electrifying read!