The book "The Theory of Heat Treatment of Metals", created by the team of authors, is a unique and in-depth study that immerses the reader in the world of metallurgy and heat treatment. This work will be a real discovery for both students studying materials and technology, and for professionals working in the field of mechanical engineering, metallurgy and related disciplines. The book discusses the basic principles of heat treatment of metals, such as hardening, annealing, normalization and other processes that play a key role in changing the properties of metals. The authors explain in detail how temperature, cooling time and speed affect the structure and characteristics of metals, as well as how these processes can be optimized to achieve the desired results. The reader will be able to learn about various heat treatment methods, their application in industry and how to choose the right treatment modes for specific materials. Who can like this book? First, it will be of interest to students of technical specialties studying at the faculties of materials science and mechanical engineering . Secondly, specialists working in metal processing companies will find in it useful recommendations and new approaches to solving practical problems. In addition, the book will be useful to researchers seeking to deepen their knowledge in the field of metallurgy and develop new processing technologies. The topics raised in the book cover a wide range of issues, ranging from the basics of thermodynamics to modern methods of analysis and quality control of heat treatment. The authors emphasize the importance of the scientific approach in metallurgy, which makes this work not only a practical guide, but also a scientific work that contributes to the development of the industry. The book also addresses issues of ecology and sustainable development, emphasizing the need for the introduction of environmentally friendly technologies in the metalworking process. The style of the authors is characterized by a high degree of accessibility and clarity of presentation, which makes it easy to assimilate even the most complex concepts. The book contains many illustrations, graphs and tables that help to visualize the material and make it more understandable. This makes the Theory of Heat Treatment of Metals not only a textbook, but also a reference book for practitioners. If you are looking for literature that will help you understand the intricacies of heat treatment of metals, then this publication will become your reliable assistant. It will not only expand your knowledge, but also inspire new ideas and projects. In a world where technology is constantly evolving and material quality requirements are becoming more stringent, understanding heat treatment processes is becoming essential for a successful career in engineering and manufacturing. The book “The Theory of Heat Treatment of Metals” is not just a collection of theoretical knowledge, it is a whole world in which everyone who is interested in modern technologies and their application in real life should immerse themselves. Do not miss the opportunity to expand your horizons and deepen your knowledge in this fascinating and important area!