The book "Mechanical processing of hardened steels" by L. M. Reznitsky is a unique work that will become an indispensable assistant for specialists in the field of mechanical engineering, metalworking and materials science. In this work, the author shares his deep knowledge and practical experience, revealing the subtleties and nuances of processing hardened steels, which play a key role in modern production. From the first pages of the book, the reader plunges into the world of high technology and engineering art. Reznicki, using an accessible and understandable language, explains the complex processes involved in machining, and offers readers unique techniques that will help optimize production processes. He emphasizes the importance of choosing the right tools and technologies, which can significantly affect the quality of the final product. The book will be of interest not only to professional engineers and technologists, but also to students of technical universities, as well as to anyone who seeks to deepen their knowledge in the field of metal processing. If you are studying at the Faculty of Mechanical Engineering or Materials Science, then this publication will become a real treasure for you. It will help you understand how to work properly with hardened steels, what mistakes should be avoided and how to achieve maximum efficiency in production processes. The topics raised in the book cover a wide range of issues, such as the choice of cutting modes, the effect of temperature on steel properties, and methods for quality control of processing. Reznicki not only shares theoretical knowledge, but also supports them with practical examples, which makes the material more accessible and understandable. It also reviews current trends in metal processing, allowing the reader to keep up to date with the latest innovations and technologies. The style of the author is distinguished by clarity and logical presentation, which makes reading not only useful, but also fascinating. L. M. Reznitsky is the author of many scientific papers and textbooks, and his experience in the field of mechanical processing of steels is not in doubt. His previous works, such as “Metal Processing Technology by Cutting” and “Fundamentals of Materials Science”, have also earned recognition and have become fundamental for many professionals. The book "Mechanical processing of hardened steels" is not just a textbook, but a real encyclopedia for everyone who wants to understand the complex processes of metal processing. It will become a reliable assistant for both beginners and experienced professionals seeking to improve their skills and expand the horizons of their knowledge. If you are looking for information on how to effectively handle hardened steels, how to avoid common mistakes and what modern methods to use, then this publication should definitely take place on your shelf. Do not miss the opportunity to immerse yourself in the world of metalworking and discover new horizons with the book L. M. Reznicki .