The book "Methods of research and determination of properties of steel steam boilers and other operating equipment" by K. Beljunas is a unique publication that will become an indispensable assistant for specialists in the field of energy, mechanical engineering and materials science. It contains valuable knowledge and practical recommendations that will help not only in research activities, but also in the daily practice of engineers and technicians. Author, K. Beljunas is a recognized expert in the field of metallurgy and equipment operation, who shares his experience and deep knowledge about the properties of steel used in steam boilers and other critical systems. The book is written in an accessible and understandable manner, which makes it suitable for both students and experienced professionals who want to update their knowledge or master new techniques. This publication addresses key aspects relating to the study and determination of the mechanical properties of steels used in steam boilers. Beljunas focuses on the importance of the right choice of materials, as this depends not only on the efficiency of the equipment, but also the safety of its operation. Readers will be able to learn about modern testing methods, analysis and interpretation of the results, which makes the book especially relevant in the context of the rapid development of technology. The topics raised in the book range from the basics of metallurgy to complex issues related to corrosion and fatigue of materials. The author shares his observations on how various factors, such as temperature, pressure and the chemical composition of the medium, affect the properties of steel. This knowledge is extremely important for engineers working in the field of design and operation of power equipment, as it avoids potential accidents and prolongs the service life of equipment. The book will be of interest not only to specialists, but also to students of technical universities studying materials and technologies. It can be an excellent teaching tool for materials science courses, as well as a useful resource for graduate students engaged in research activities in this area. Readers interested in the reliability and safety of energy systems will find in it many useful ideas and recommendations. The author's style is distinguished by clarity and logical presentation, which makes complex technical aspects accessible for understanding. K. Belyunas has extensive experience in research institutes and in production, which allows him to share not only theoretical knowledge, but also practical examples. His previous work also covers topics related to the operation and repair of power equipment, which confirms his status as an expert in this field. The book “Methods for researching and determining the properties of steel steam boilers and other operating equipment” is not just a collection of scientific data, but a practical guide that will help readers understand the intricacies of working with materials used in critical systems. If you are looking for information on how to properly explore and determine the properties of steel, or want to deepen your knowledge in the field of materials science, this publication will become your reliable companion. Thus, this book is not only a useful source of knowledge, but also an inspiration for those who seek to improve in their professional activities. Do not miss the opportunity to enrich your knowledge and skills by reading this unique paper by K. Beljunas .